(gdb) bt
#0  0x00007f85a34d5425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f85a34d8b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f85a351339e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007f85a351db96 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007f85a402dff6 in std::string::assign(std::string const&) ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x0000000000422f33 in operator= (__str=..., this=0x7fff16b88570)
    at /usr/include/c++/4.6/bits/basic_string.h:542
#6  vfe::vfeSession::GetNextCombinedMessage (this=0x196d870,
    Type=@0x7fff16b88580: vfe::vfeSession::mGenericStatus, Message=...)
    at vfesession.cpp:416
#7  0x0000000000440b72 in PrintStatus (session=0x196d870)
    at unix/unixconsole.cpp:226
#8  0x0000000000412c87 in main (argc=7, argv=0x1970518)
    at unix/unixconsole.cpp:566


thread apply all backtrace
Thread 14 (Thread 0x7f857f7fe700 (LWP 11014)):
#0  0x00000000005ce11f in pov_base::RGBImage<unsigned char, 255u, 7, std::allocator<unsigned char> >::GetRGBValue (this=0x7f8580012970, x=<optimized out>,
    y=<optimized out>, red=@0x7f857f7fa780: 0, green=@0x7f857f7fa784: 0,
    blue=@0x7f857f7fa788: 0) at image/image.cpp:1292
#1  0x00000000005cbe9d in pov_base::RGBImage<unsigned char, 255u, 7, std::allocator<unsigned char> >::GetRGBFTValue (this=<optimized out>, x=<optimized out>,
    y=<optimized out>, red=<optimized out>, green=<optimized out>,
    blue=<optimized out>, filter=@0x7f857f7fa78c: 0, transm=@0x7f857f7fa790: 0)
    at image/image.cpp:1303
#2  0x00000000005c1ab1 in pov_base::Image::GetRGBFTValue (this=0x7f8580012970,
    x=<optimized out>, y=<optimized out>, colour=..., premul=false)
    at image/image.cpp:4088
#3  0x00000000004cbefa in pov::no_interpolation (image=0x7f8580012bc0,
    xcoor=<optimized out>, ycoor=<optimized out>, colour=...,
    index=0x7f857f7fa82c, premul=<optimized out>) at support/imageutil.cpp:1058
#4  0x00000000004cd1a7 in InterpolateBicubic (premul=false,
    index=0x7f857f7fa88c, colour=..., ycoor=<optimized out>,
    xcoor=<optimized out>, image=0x7f8580012bc0) at support/imageutil.cpp:1196
#5  pov::image_colour_at (image=0x7f8580012bc0, xcoor=<optimized out>,
    ycoor=<optimized out>, colour=..., index=0x7f857f7fa88c, premul=false)
    at support/imageutil.cpp:518
#6  0x00000000004ce4ef in pov::image_map (EPoint=<optimized out>,
    Pigment=0x7f8580012af0, colour=...) at support/imageutil.cpp:214
#7  0x000000000049b4d6 in pov::Compute_Pigment (colour=...,
    Pigment=0x7f8580012af0, EPoint=0x7f857f7fa9c0, Intersect=0x0, ray=0x0,
    Thread=0x7f8594085000) at texture/pigment.cpp:623
#8  0x00000000004b466e in pov::f_pigment (ctx=0x7f859409cda0,
    ptr=<optimized out>, fn=<optimized out>, sp=10) at vm/fnintern.cpp:1287
#9  0x00000000004b121d in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=109) at vm/fnpovfpu.cpp:1500
#10 0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f859409cda0) at shape/isosurf.cpp:1238
#11 Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#12 pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857f7fac20, dt=1.5945525102692351,
    t21=0.0031143603716196002, len=<optimized out>, maxg=@0x7f857f7fb500: 512)
    at shape/isosurf.cpp:1127
#13 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7faee0,
    dt=3.1891050205384701, t21=0.0062287207432392003, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1130
#14 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7faee0,
    dt=6.3782100410769402, t21=0.012457441486478401, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1131
#15 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7faee0,
    dt=12.75642008215388, t21=0.024914882972956801, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1131
#16 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7faee0,
    dt=25.512840164307761, t21=0.049829765945913602, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1131
#17 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7faf90,
    dt=51.025680328615522, t21=0.099659531891827205, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1130
#18 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7fb1a0,
    dt=102.05136065723104, t21=0.19931906378365441, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1130
#19 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7fb1a0,
    dt=204.10272131446209, t21=0.39863812756730882, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1131
#20 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857f7fb1a0,
    dt=408.20544262892417, t21=0.79727625513461764, len=<optimized out>,
    maxg=@0x7f857f7fb500: 512) at shape/isosurf.cpp:1131
#21 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857f7fb460, DD=0x7f857f7fb480,
    Depth1=0x7f857f7fb4f0, Depth2=<optimized out>, maxg=@0x7f857f7fb500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#22 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f8594085000)
    at shape/isosurf.cpp:301
#23 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857f7fc720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f8594085000) at scene/objects.cpp:241
#24 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857f7fc9f0,
    precondition=..., postcondition=..., Thread=0x7f8594085000)
    at bounding/bbox.cpp:514
#25 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f85940836c0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#26 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f85940836c0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#27 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f85940836c0,
    x=1061, y=1001, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#28 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f8594083620) at render/tracetask.cpp:470
#29 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f8594083620)
    at render/tracetask.cpp:335
#30 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f8594083620,
    completion=...) at support/task.cpp:230
#31 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#32 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#33 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#34 0x0000000000000000 in ?? ()

Thread 13 (Thread 0x7f857effd700 (LWP 11015)):
#0  0x00000000004cbf1c in pov::no_interpolation (image=0x7f8580012bc0,
    xcoor=<optimized out>, ycoor=<optimized out>, colour=...,
    index=0x7f857eff9a3c, premul=<optimized out>) at support/imageutil.cpp:1066
#1  0x00000000004ce117 in InterpolateBicubic (premul=false,
    index=0x7f857eff9a9c, colour=..., ycoor=<optimized out>,
    xcoor=<optimized out>, image=0x7f8580012bc0) at support/imageutil.cpp:119
#2  pov::image_colour_at (image=0x7f8580012bc0, xcoor=<optimized out>,
    ycoor=<optimized out>, colour=..., index=0x7f857eff9a9c, premul=false)
    at support/imageutil.cpp:518
#3  0x00000000004ce4ef in pov::image_map (EPoint=<optimized out>,
    Pigment=0x7f8580012af0, colour=...) at support/imageutil.cpp:214
#4  0x000000000049b4d6 in pov::Compute_Pigment (colour=...,
    Pigment=0x7f8580012af0, EPoint=0x7f857eff9bd0, Intersect=0x0, ray=0x0,
    Thread=0x7f85940ad5e0) at texture/pigment.cpp:623
#5  0x00000000004b466e in pov::f_pigment (ctx=0x7f85940c53a0,
    ptr=<optimized out>, fn=<optimized out>, sp=10) at vm/fnintern.cpp:1287
#6  0x00000000004b121d in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=109) at vm/fnpovfpu.cpp:1500
#7  0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f85940c53a0) at shape/isosurf.cpp:1238
#8  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#9  pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857eff9f90, dt=10.007731873186341,
    t21=0.019546351314817075, len=<optimized out>, maxg=@0x7f857effa500: 512)
    at shape/isosurf.cpp:1127
#10 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857eff9f90,
    dt=20.015463746372681, t21=0.03909270262963415, len=<optimized out>,
    maxg=@0x7f857effa500: 512) at shape/isosurf.cpp:1131
#11 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857eff9f90,
    dt=40.030927492745363, t21=0.078185405259268301, len=<optimized out>,
    maxg=@0x7f857effa500: 512) at shape/isosurf.cpp:1131
#12 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857effa040,
    dt=80.061854985490726, t21=0.1563708105185366, len=<optimized out>,
    maxg=@0x7f857effa500: 512) at shape/isosurf.cpp:1130
#13 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857effa1a0,
    dt=160.12370997098145, t21=0.3127416210370732, len=<optimized out>,
    maxg=@0x7f857effa500: 512) at shape/isosurf.cpp:1130
#14 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857effa1a0,
    dt=320.2474199419629, t21=0.62548324207414641, len=<optimized out>,
    maxg=@0x7f857effa500: 512) at shape/isosurf.cpp:1131
#15 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857effa460, DD=0x7f857effa480,
    Depth1=0x7f857effa4f0, Depth2=<optimized out>, maxg=@0x7f857effa500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#16 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f85940ad5e0)
    at shape/isosurf.cpp:301
#17 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857effb720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f85940ad5e0) at scene/objects.cpp:241
#18 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857effb9f0,
    precondition=..., postcondition=..., Thread=0x7f85940ad5e0)
    at bounding/bbox.cpp:514
#19 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f85940abca0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#20 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f85940abca0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#21 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f85940abca0,
    x=1462, y=1000, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#22 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f85940abc00) at render/tracetask.cpp:470
#23 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f85940abc00)
    at render/tracetask.cpp:335
#24 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f85940abc00,
    completion=...) at support/task.cpp:230
#25 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#26 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#27 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#28 0x0000000000000000 in ?? ()

Thread 12 (Thread 0x7f857ffff700 (LWP 11013)):
#0  0x00000000004af222 in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=110) at vm/fnpovfpu.cpp:1430
#1  0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f8594074790) at shape/isosurf.cpp:1238
#2  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#3  pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857fffbcd0, dt=2.1795123561103131,
    t21=0.0042568600705279562, len=<optimized out>, maxg=@0x7f857fffc500: 512)
    at shape/isosurf.cpp:1127
#4  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffbd80,
    dt=4.3590247122206263, t21=0.0085137201410559124, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#5  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffbe30,
    dt=8.7180494244412525, t21=0.017027440282111825, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#6  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffbee0,
    dt=17.436098848882505, t21=0.03405488056422365, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#7  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffbf90,
    dt=34.87219769776501, t21=0.068109761128447299, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#8  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffc040,
    dt=69.74439539553002, t21=0.1362195222568946, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#9  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffc1a0,
    dt=139.48879079106004, t21=0.2724390445137892, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1130
#10 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857fffc1a0,
    dt=278.97758158212008, t21=0.54487808902757839, len=<optimized out>,
    maxg=@0x7f857fffc500: 512) at shape/isosurf.cpp:1131
#11 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857fffc460, DD=0x7f857fffc480,
    Depth1=0x7f857fffc4f0, Depth2=<optimized out>, maxg=@0x7f857fffc500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#12 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f859405c9f0)
    at shape/isosurf.cpp:301
#13 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857fffd720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f859405c9f0) at scene/objects.cpp:241
#14 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857fffd9f0,
    precondition=..., postcondition=..., Thread=0x7f859405c9f0)
    at bounding/bbox.cpp:514
#15 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f859405b0b0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#16 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f859405b0b0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#17 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f859405b0b0,
    x=1655, y=996, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#18 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f859405b010) at render/tracetask.cpp:470
#19 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f859405b010)
    at render/tracetask.cpp:335
#20 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f859405b010,
    completion=...) at support/task.cpp:230
#21 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#22 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#23 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#24 0x0000000000000000 in ?? ()

Thread 11 (Thread 0x7f857e7bb700 (LWP 11016)):
#0  0x00000000004b0153 in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=110) at vm/fnpovfpu.cpp:1411
#1  0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f85940ed9d0) at shape/isosurf.cpp:1238
#2  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#3  pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857e7b7f90, dt=18.491982631450764,
    t21=0.03611715357705228, len=<optimized out>, maxg=@0x7f857e7b8500: 512)
    at shape/isosurf.cpp:1127
#4  0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857e7b7f90,
    dt=36.983965262901528, t21=0.07223430715410456, len=<optimized out>,
    maxg=@0x7f857e7b8500: 512) at shape/isosurf.cpp:1131
#5  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857e7b8040,
    dt=73.967930525803055, t21=0.14446861430820912, len=<optimized out>,
    maxg=@0x7f857e7b8500: 512) at shape/isosurf.cpp:1130
#6  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857e7b81a0,
    dt=147.93586105160611, t21=0.28893722861641824, len=<optimized out>,
    maxg=@0x7f857e7b8500: 512) at shape/isosurf.cpp:1130
#7  0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857e7b81a0,
    dt=295.87172210321222, t21=0.57787445723283648, len=<optimized out>,
    maxg=@0x7f857e7b8500: 512) at shape/isosurf.cpp:1131
#8  0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857e7b8460, DD=0x7f857e7b8480,
    Depth1=0x7f857e7b84f0, Depth2=<optimized out>, maxg=@0x7f857e7b8500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#9  0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f85940d5c30)
    at shape/isosurf.cpp:301
#10 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857e7b9720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f85940d5c30) at scene/objects.cpp:241
#11 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857e7b99f0,
    precondition=..., postcondition=..., Thread=0x7f85940d5c30)
    at bounding/bbox.cpp:514
#12 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f85940d42f0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#13 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f85940d42f0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#14 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f85940d42f0,
    x=1570, y=1002, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#15 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f85940d4250) at render/tracetask.cpp:470
#16 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f85940d4250)
    at render/tracetask.cpp:335
#17 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f85940d4250,
    completion=...) at support/task.cpp:230
#18 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#19 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#20 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#21 0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7f859dcb1700 (LWP 11007)):
#0  0x00007f85a386ad84 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000584688 in boost::condition_variable_any::wait<boost::unique_lock<boost::recursive_mutex> > (this=0x7f8594001648, m=...)
    at /usr/include/boost/thread/pthread/condition_variable.hpp:123
#2  0x0000000000583535 in pov::TaskQueue::Process (this=0x7f8594001570)
    at support/taskqueue.cpp:305
#3  0x00000000004edb98 in pov::Scene::ParserControlThread (this=0x7f8594001570)
    at scene/scene.cpp:742
#4  0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#5  0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f857deb6700 (LWP 11017)):
#0  wrap<double> (upperLimit=1000, val=<optimized out>)
    at ../../source/base/types.h:155
#1  pov::map_pos (EPoint=<optimized out>, xcoor=0x7f857deb2be8,
    ycoor=0x7f857deb2bf0, TPattern=<optimized out>)
    at support/imageutil.cpp:991
#2  0x00000000004ce4a1 in pov::image_map (EPoint=<optimized out>,
    Pigment=0x7f8580012af0, colour=...) at support/imageutil.cpp:208
#3  0x000000000049b4d6 in pov::Compute_Pigment (colour=...,
    Pigment=0x7f8580012af0, EPoint=0x7f857deb2d30, Intersect=0x0, ray=0x0,
    Thread=0x7f85940fe400) at texture/pigment.cpp:623
#4  0x00000000004b466e in pov::f_pigment (ctx=0x7f85941161c0,
    ptr=<optimized out>, fn=<optimized out>, sp=10) at vm/fnintern.cpp:1287
#5  0x00000000004b121d in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=109) at vm/fnpovfpu.cpp:1500
#6  0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f85941161c0) at shape/isosurf.cpp:1238
#7  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#8  pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857deb2f90, dt=36.141362598113282,
    t21=0.070588598824440019, len=<optimized out>, maxg=@0x7f857deb3500: 512)
    at shape/isosurf.cpp:1127
#9  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857deb3040,
    dt=72.282725196226565, t21=0.14117719764888004, len=<optimized out>,
    maxg=@0x7f857deb3500: 512) at shape/isosurf.cpp:1130
#10 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857deb31a0,
    dt=144.56545039245313, t21=0.28235439529776007, len=<optimized out>,
    maxg=@0x7f857deb3500: 512) at shape/isosurf.cpp:1130
#11 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857deb31a0,
    dt=289.13090078490626, t21=0.56470879059552015, len=<optimized out>,
    maxg=@0x7f857deb3500: 512) at shape/isosurf.cpp:1131
#12 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857deb3460, DD=0x7f857deb3480,
    Depth1=0x7f857deb34f0, Depth2=<optimized out>, maxg=@0x7f857deb3500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#13 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f85940fe400)
    at shape/isosurf.cpp:301
#14 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857deb4720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f85940fe400) at scene/objects.cpp:241
#15 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857deb49f0,
    precondition=..., postcondition=..., Thread=0x7f85940fe400)
    at bounding/bbox.cpp:514
#16 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f85940fcac0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#17 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f85940fcac0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#18 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f85940fcac0,
    x=1602, y=1001, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#19 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f85940fca20) at render/tracetask.cpp:470
#20 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f85940fca20)
    at render/tracetask.cpp:335
#21 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f85940fca20,
    completion=...) at support/task.cpp:230
#22 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#23 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#24 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#25 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f859e4b2700 (LWP 11006)):
#0  0x00007f85a386b0fe in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000445914 in boost::condition_variable_any::timed_wait<boost::unique_lock<boost::mutex> > (this=0x7f8594000978, m=..., wait_until=...)
    at /usr/include/boost/thread/pthread/condition_variable.hpp:147
#2  0x000000000044541a in timed_wait<boost::unique_lock<boost::mutex> > (
    wait_until=<synthetic pointer>, m=..., this=0x7f8594000978)
    at /usr/include/boost/thread/pthread/condition_variable.hpp:163
#3  vfe::SysQNode::Receive (this=0x7f8594000930, pLen=0x7f859e4b1ce0,
    Blocking=<optimized out>) at vfepovms.cpp:252
#4  0x00000000005b8cb8 in POVMS_ProcessMessages (contextref=0x7f85940008e0,
    blocking=<optimized out>, yielding=<optimized out>) at povms.cpp:621
#5  0x000000000045935e in (anonymous namespace)::MainThreadFunction (
    threadExit=...) at povray.cpp:583
#6  0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#7  0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#8  0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f859ecb3700 (LWP 11005)):
#0  0x00007f85a3587a43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f85a1684862 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f85a1685d7f in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f85a1685f9b in xcb_wait_for_reply ()
   from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007f85a286af5d in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007f85a286699d in XSync () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#6  0x00007f85a2847870 in XCloseDisplay ()
   from /usr/lib/x86_64-linux-gnu/libX11.so.6
#7  0x00007f85a57083d2 in ?? () from /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0
#8  0x00007f85a56fa75e in SDL_VideoQuit ()
   from /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0
#9  0x00007f85a56d1215 in SDL_QuitSubSystem ()
   from /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0
#10 0x00007f85a56d12ce in SDL_Quit ()
   from /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0
#11 0x00007f85a56d18cf in ?? () from /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0
#12 <signal handler called>
#13 0x0000000000417795 in SetPixelScaled (colour=..., y=1002, x=444,
    this=0x7f859000c890) at disp_sdl.cpp:353
#14 pov_frontend::UnixSDLDisplay::DrawPixelBlock (this=0x7f859000c890,
    x1=<optimized out>, y1=<optimized out>, x2=<optimized out>,
    y2=<optimized out>, colour=0x7f85901cd760) at disp_sdl.cpp:551
#15 0x00000000005acb59 in pov_frontend::ImageMessageHandler::DrawPixelBlockSet
    (this=<optimized out>, sd=..., vd=..., msg=...)
    at imagemessagehandler.cpp:267
#16 0x0000000000456094 in pov_frontend::RenderFrontend<vfe::vfeParserMessageHandler, pov_frontend::FileMessageHandler, vfe::vfeRenderMessageHandler, pov_frontend::ImageMessageHandler>::HandleImageMessage (this=0x7f859000ace8, vid=...,
    ident=1350058579, msg=...) at ../source/frontend/renderfrontend.h:881
#17 0x0000000000599033 in pov_frontend::RenderFrontendBase::HandleMessage (
    this=0x7f859000ace8, msg=..., result=...) at renderfrontend.cpp:642
#18 0x00000000005ec17e in POVMS_MessageReceiver::ReceiveHandler (
    msg=0x7f859ecb2c30, result=0x7f859ecb2c40, mode=1,
    privatedataptr=<optimized out>) at povmscpp.cpp:1773
#19 0x00000000005b6323 in POVMS_Receive (contextref=0x7f85900008e0,
    msg=0x7f859ecb2c30, result=0x7f859ecb2c40, mode=1) at povms.cpp:961
#20 0x00000000005b8fde in POVMS_ProcessMessages (contextref=0x7f85900008e0,
    blocking=<optimized out>, yielding=<optimized out>) at povms.cpp:691
#21 0x0000000000421ccf in vfe::vfeSession::WorkerThread (this=0x196d870)
    at vfesession.cpp:666
#22 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#23 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#24 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#25 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f859d4b0700 (LWP 11010)):
#0  0x00007f85a386e52d in nanosleep ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000457d64 in pov_base::Delay (msec=<optimized out>)
    at unix/platformbase.cpp:125
#2  0x00000000004e3800 in pov::View::RenderControlThread (this=0x7f8594002c90)
    at scene/view.cpp:1466
#3  0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#4  0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f858ce55700 (LWP 11012)):
#0  pov::POVFPU_RunDefault (context=<optimized out>, fn=110)
    at vm/fnpovfpu.cpp:1376
#1  0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f859402e910) at shape/isosurf.cpp:1238
#2  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#3  pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f858ce51d80, dt=4.0877566913207248,
    t21=0.0079838997877357924, len=<optimized out>, maxg=@0x7f858ce52500: 512)
    at shape/isosurf.cpp:1127
#4  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce51e30,
    dt=8.1755133826414497, t21=0.015967799575471585, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1130
#5  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce520f0,
    dt=16.351026765282899, t21=0.03193559915094317, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1130
#6  0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce520f0,
    dt=32.702053530565799, t21=0.063871198301886339, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1131
#7  0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce520f0,
    dt=65.404107061131597, t21=0.12774239660377268, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1131
#8  0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce520f0,
    dt=130.80821412226319, t21=0.25548479320754536, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1131
#9  0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f858ce521a0,
    dt=261.61642824452639, t21=0.51096958641509072, len=<optimized out>,
    maxg=@0x7f858ce52500: 512) at shape/isosurf.cpp:1130
#10 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f858ce52460, DD=0x7f858ce52480,
    Depth1=0x7f858ce524f0, Depth2=<optimized out>, maxg=@0x7f858ce52500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#11 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f8594033ed0)
    at shape/isosurf.cpp:301
#12 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f858ce53720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f8594033ed0) at scene/objects.cpp:241
#13 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f858ce539f0,
    precondition=..., postcondition=..., Thread=0x7f8594033ed0)
    at bounding/bbox.cpp:514
#14 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f8594032590,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#15 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f8594032590, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#16 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f8594032590,
    x=1738, y=993, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#17 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f85940324f0) at render/tracetask.cpp:470
#18 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f85940324f0)
    at render/tracetask.cpp:335
#19 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f85940324f0,
    completion=...) at support/task.cpp:230
#20 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#21 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#22 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#23 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f859f4b4700 (LWP 11004)):
#0  0x00007f85a386e9f7 in do_sigwait ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f85a386ea79 in sigwait () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x000000000044103c in SignalHandler () at unix/unixconsole.cpp:144
#3  0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#4  0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f857d58e700 (LWP 11018)):
#0  0x00000000005ce138 in pov_base::RGBImage<unsigned char, 255u, 7, std::allocator<unsigned char> >::GetRGBValue (this=0x7f8580012970, x=<optimized out>,
    y=<optimized out>, red=<optimized out>, green=@0x7f857d58aa44: 0,
    blue=@0x7f857d58aa48: 0) at image/image.cpp:1293
#1  0x00000000005cbe9d in pov_base::RGBImage<unsigned char, 255u, 7, std::allocator<unsigned char> >::GetRGBFTValue (this=<optimized out>, x=<optimized out>,
    y=<optimized out>, red=<optimized out>, green=<optimized out>,
    blue=<optimized out>, filter=@0x7f857d58aa4c: 0, transm=@0x7f857d58aa50: 0)
    at image/image.cpp:1303
#2  0x00000000005c1ab1 in pov_base::Image::GetRGBFTValue (this=0x7f8580012970,
    x=<optimized out>, y=<optimized out>, colour=..., premul=false)
    at image/image.cpp:4088
#3  0x00000000004cbefa in pov::no_interpolation (image=0x7f8580012bc0,
    xcoor=<optimized out>, ycoor=<optimized out>, colour=...,
    index=0x7f857d58aaec, premul=<optimized out>) at support/imageutil.cpp:1058
#4  0x00000000004cd722 in InterpolateBicubic (premul=false,
    index=0x7f857d58ab4c, colour=..., ycoor=<optimized out>,
    xcoor=<optimized out>, image=0x7f8580012bc0) at support/imageutil.cpp:1196
#5  pov::image_colour_at (image=0x7f8580012bc0, xcoor=<optimized out>,
    ycoor=<optimized out>, colour=..., index=0x7f857d58ab4c, premul=false)
    at support/imageutil.cpp:518
#6  0x00000000004ce4ef in pov::image_map (EPoint=<optimized out>,
    Pigment=0x7f8580012af0, colour=...) at support/imageutil.cpp:214
#7  0x000000000049b4d6 in pov::Compute_Pigment (colour=...,
    Pigment=0x7f8580012af0, EPoint=0x7f857d58ac80, Intersect=0x0, ray=0x0,
    Thread=0x7f8594126800) at texture/pigment.cpp:623
#8  0x00000000004b466e in pov::f_pigment (ctx=0x7f859413e5c0,
    ptr=<optimized out>, fn=<optimized out>, sp=10) at vm/fnintern.cpp:1287
#9  0x00000000004b121d in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=109) at vm/fnpovfpu.cpp:1500
#10 0x0000000000532b4d in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f859413e5c0) at shape/isosurf.cpp:1238
#11 Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#12 pov::IsoSurface::Function_Find_Root_R (this=0x7f858001d1b0, itd=...,
    EP1=<optimized out>, EP2=0x7f857d58b0f0, dt=16.557371280955294,
    t21=0.032338615783115816, len=<optimized out>, maxg=@0x7f857d58b500: 512)
    at shape/isosurf.cpp:1127
#13 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857d58b0f0,
    dt=33.114742561910589, t21=0.064677231566231633, len=<optimized out>,
    maxg=@0x7f857d58b500: 512) at shape/isosurf.cpp:1131
#14 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857d58b0f0,
    dt=66.229485123821178, t21=0.12935446313246327, len=<optimized out>,
    maxg=@0x7f857d58b500: 512) at shape/isosurf.cpp:1131
#15 0x0000000000532be1 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857d58b0f0,
    dt=132.45897024764236, t21=0.25870892626492653, len=<optimized out>,
    maxg=@0x7f857d58b500: 512) at shape/isosurf.cpp:1131
#16 0x0000000000532ba6 in pov::IsoSurface::Function_Find_Root_R (
    this=0x7f858001d1b0, itd=..., EP1=<optimized out>, EP2=0x7f857d58b1a0,
    dt=264.91794049528471, t21=0.51741785252985306, len=<optimized out>,
    maxg=@0x7f857d58b500: 512) at shape/isosurf.cpp:1130
#17 0x0000000000532f0f in pov::IsoSurface::Function_Find_Root (
    this=0x7f858001d1b0, itd=..., PP=0x7f857d58b460, DD=0x7f857d58b480,
    Depth1=0x7f857d58b4f0, Depth2=<optimized out>, maxg=@0x7f857d58b500: 512,
    in_shadow_test=false) at shape/isosurf.cpp:1037
#18 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f8594126800)
    at shape/isosurf.cpp:301
#19 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f857d58c720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f8594126800) at scene/objects.cpp:241
#20 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f857d58c9f0,
    precondition=..., postcondition=..., Thread=0x7f8594126800)
    at bounding/bbox.cpp:514
#21 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f8594124ec0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#22 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f8594124ec0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#23 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f8594124ec0,
    x=1723, y=993, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#24 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f8594124e20) at render/tracetask.cpp:470
#25 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f8594124e20)
    at render/tracetask.cpp:335
#26 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f8594124e20,
    completion=...) at support/task.cpp:230
#27 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#28 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#29 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#30 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f859c9d2700 (LWP 11011)):
#0  pov_base::Image::GetRGBFTValue (this=0x7f8580012970, x=463, y=980,
    colour=..., premul=false) at image/image.cpp:4087
#1  0x00000000004cbefa in pov::no_interpolation (image=0x7f8580012bc0,
    xcoor=<optimized out>, ycoor=<optimized out>, colour=...,
    index=0x7f859c9cee5c, premul=<optimized out>) at support/imageutil.cpp:1058
#2  0x00000000004cd949 in InterpolateBicubic (premul=false,
    index=0x7f859c9ceebc, colour=..., ycoor=<optimized out>,
    xcoor=<optimized out>, image=0x7f8580012bc0) at support/imageutil.cpp:1196
#3  pov::image_colour_at (image=0x7f8580012bc0, xcoor=<optimized out>,
    ycoor=<optimized out>, colour=..., index=0x7f859c9ceebc, premul=false)
    at support/imageutil.cpp:518
#4  0x00000000004ce4ef in pov::image_map (EPoint=<optimized out>,
    Pigment=0x7f8580012af0, colour=...) at support/imageutil.cpp:214
#5  0x000000000049b4d6 in pov::Compute_Pigment (colour=...,
    Pigment=0x7f8580012af0, EPoint=0x7f859c9ceff0, Intersect=0x0, ray=0x0,
    Thread=0x7f859400bbe0) at texture/pigment.cpp:623
#6  0x00000000004b466e in pov::f_pigment (ctx=0x7f8594003720,
    ptr=<optimized out>, fn=<optimized out>, sp=10) at vm/fnintern.cpp:1287
#7  0x00000000004b121d in pov::POVFPU_RunDefault (context=<optimized out>,
    fn=109) at vm/fnpovfpu.cpp:1500
#8  0x0000000000532e6b in Evaluate_Function (fnvec=<synthetic pointer>,
    funct=111, ctx=0x7f8594003720) at shape/isosurf.cpp:1238
#9  Float_Function (t=<optimized out>, itd=..., this=0x7f858001d1b0)
    at shape/isosurf.cpp:1204
#10 pov::IsoSurface::Function_Find_Root (this=0x7f858001d1b0, itd=...,
    PP=0x7f859c9cf460, DD=0x7f859c9cf480, Depth1=0x7f859c9cf4f0,
    Depth2=<optimized out>, maxg=@0x7f859c9cf500: 512, in_shadow_test=false)
    at shape/isosurf.cpp:1029
#11 0x0000000000533993 in pov::IsoSurface::All_Intersections (
    this=0x7f858001d1b0, ray=..., Depth_Stack=..., Thread=0x7f859400bbe0)
    at shape/isosurf.cpp:301
#12 0x00000000004df3b4 in pov::Find_Intersection (isect=0x7f859c9d0720,
    object=0x7f858001d1b0, ray=..., postcondition=...,
    threadData=0x7f859400bbe0) at scene/objects.cpp:241
#13 0x000000000057dd74 in pov::Intersect_BBox_Tree (pqueue=...,
    Root=<optimized out>, ray=..., Best_Intersection=0x7f859c9d09f0,
    precondition=..., postcondition=..., Thread=0x7f859400bbe0)
    at bounding/bbox.cpp:514
#14 0x00000000004fcf83 in pov::Trace::FindIntersection (this=0x7f859400a2a0,
    bestisect=..., ray=..., precondition=..., postcondition=...)
    at render/trace.cpp:351
#15 0x00000000005064c6 in pov::Trace::TraceRay (this=0x7f859400a2a0, ray=...,
    colour=..., weight=<optimized out>, ticket=..., continuedRay=false,
    maxDepth=<optimized out>) at render/trace.cpp:191
#16 0x000000000058f1f9 in pov::TracePixel::operator() (this=0x7f859400a2a0,
    x=1686, y=993, width=2596, height=1003, colour=...)
    at render/tracepixel.cpp:332
#17 0x000000000050f411 in pov::TraceTask::SimpleSamplingM0 (
    this=0x7f859400a200) at render/tracetask.cpp:470
#18 0x00000000005110a5 in pov::TraceTask::Run (this=0x7f859400a200)
    at render/tracetask.cpp:335
#19 0x00000000004c9e8f in pov::Task::TaskThread (this=0x7f859400a200,
    completion=...) at support/task.cpp:230
#20 0x00007f85a429ace9 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.46.1
#21 0x00007f85a3866e9a in start_thread ()
   from /lib/x86_64-linux-gnu/libpthread.so.0
#22 0x00007f85a35933fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#23 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f85a5b4e740 (LWP 11003)):
#0  0x00007f85a34d5425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f85a34d8b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f85a351339e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3  0x00007f85a351db96 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007f85a402dff6 in std::string::assign(std::string const&) ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x0000000000422f33 in operator= (__str=..., this=0x7fff16b88570)
    at /usr/include/c++/4.6/bits/basic_string.h:542
#6  vfe::vfeSession::GetNextCombinedMessage (this=0x196d870,
    Type=@0x7fff16b88580: vfe::vfeSession::mGenericStatus, Message=...)
    at vfesession.cpp:416
#7  0x0000000000440b72 in PrintStatus (session=0x196d870)
    at unix/unixconsole.cpp:226
#8  0x0000000000412c87 in main (argc=7, argv=0x1970518)
    at unix/unixconsole.cpp:566