Segmentation fault during isocontour extraction

Originally reported by: Nathan Goldbaum (Bitbucket: ngoldbaum, GitHub: ngoldbaum)

I just tried running the following test script:

#!python

from yt.mods import *
pf = load('IsolatedGalaxy/galaxy0030/galaxy0030')
dd = pf.h.disk('c', [0,0,1], (20, 'kpc'), (3, 'kpc'))
iso = dd.extract_isocontours('Radiuskpc', 10)

I got the following output:

○ python test.py
yt : [INFO     ] 2013-12-13 11:56:33,925 Parameters: current_time              = 0.00600002000283
yt : [INFO     ] 2013-12-13 11:56:33,925 Parameters: domain_dimensions         = [32 32 32]
yt : [INFO     ] 2013-12-13 11:56:33,926 Parameters: domain_left_edge          = [ 0.  0.  0.]
yt : [INFO     ] 2013-12-13 11:56:33,926 Parameters: domain_right_edge         = [ 1.  1.  1.]
yt : [INFO     ] 2013-12-13 11:56:33,927 Parameters: cosmological_simulation   = 0.0
yt : [INFO     ] 2013-12-13 11:56:33,936 Getting the binary hierarchy
Parsing Hierarchy 100% |||||||||||||||||||||||||||||||||||||||||||| Time: 0:00:00
yt : [INFO     ] 2013-12-13 11:56:33,958 Gathering a field list (this may take a moment.)
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field SFR_Density to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field Forming_Stellar_Mass_Density to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field Galaxy1Colour to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field kphHeI to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field MBHColour to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field Phi_pField to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,047 Adding unknown field Galaxy2Colour to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field Average_creation_time to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field gammaHI to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field kphHI to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field kphHeII to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field Star_Particle_Density to list of fields
yt : [INFO     ] 2013-12-13 11:56:34,048 Adding unknown field PhiField to list of fields
Extracting  10% |/////                                            | ETA:  0:00:01 [1]    23478 segmentation fault  python test.py

I also get the following traceback:

Process:         Python [23478]
Path:            /usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier:      Python
Version:         2.7.6 (2.7.6)
Code Type:       X86-64 (Native)
Parent Process:  zsh [22823]
Responsible:     iTerm [74627]
User ID:         501

Date/Time:       2013-12-13 11:56:34.540 -0800
OS Version:      Mac OS X 10.9 (13A603)
Report Version:  11
Anonymous UUID:  BACF5D1D-C3A9-F8E9-313C-32418FA98979

Sleep/Wake UUID: 639A2BB5-BAF9-41EF-B693-C9FBEBE37DAD

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000077

VM Regions Near 0x77:
--> 
    __TEXT                 000000010ff4b000-000000010ff4d000 [    8K] r-x/rwx SM=COW  /usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   marching_cubes.so               0x0000000111255cfd __pyx_pw_2yt_9utilities_3lib_14marching_cubes_1march_cubes_grid + 6301 (marching_cubes.c:1694)
1   org.python.python               0x000000010ffd5656 PyEval_EvalFrameEx + 8364
2   org.python.python               0x000000010ffd3480 PyEval_EvalCodeEx + 1638
3   org.python.python               0x000000010ff7a68b function_call + 336
4   org.python.python               0x000000010ff5cf6d PyObject_Call + 101
5   org.python.python               0x000000010ffd7af4 PyEval_EvalFrameEx + 17738
6   org.python.python               0x000000010ffd3480 PyEval_EvalCodeEx + 1638
7   org.python.python               0x000000010ffd9d0b fast_function + 282
8   org.python.python               0x000000010ffd6c85 PyEval_EvalFrameEx + 14043
9   org.python.python               0x000000010ffd3480 PyEval_EvalCodeEx + 1638
10  org.python.python               0x000000010ffd9d0b fast_function + 282
11  org.python.python               0x000000010ffd6c85 PyEval_EvalFrameEx + 14043
12  org.python.python               0x000000010ffd3480 PyEval_EvalCodeEx + 1638
13  org.python.python               0x000000010ffd2e14 PyEval_EvalCode + 54
14  org.python.python               0x000000010fff23c4 run_mod + 53
15  org.python.python               0x000000010fff246b PyRun_FileExFlags + 137
16  org.python.python               0x000000010fff1fb9 PyRun_SimpleFileExFlags + 718
17  org.python.python               0x0000000110002a67 Py_Main + 2995
18  libdyld.dylib                   0x00007fff9808d5fd start + 1

Thread 1:
0   libsystem_kernel.dylib          0x00007fff9380ce6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x00007fff98b99f08 _pthread_wqthread + 330
2   libsystem_pthread.dylib         0x00007fff98b9cfb9 start_wqthread + 13

Thread 2:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib          0x00007fff9380d662 kevent64 + 10
1   libdispatch.dylib               0x00007fff98b7f43d _dispatch_mgr_invoke + 239
2   libdispatch.dylib               0x00007fff98b7f152 _dispatch_mgr_thread + 52

Thread 3:
0   libsystem_kernel.dylib          0x00007fff9380ce6a __workq_kernreturn + 10
1   libsystem_pthread.dylib         0x00007fff98b99f08 _pthread_wqthread + 330
2   libsystem_pthread.dylib         0x00007fff98b9cfb9 start_wqthread + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000027  rbx: 0x00007fff4fcb39d8  rcx: 0x0000000000000001  rdx: 0x00000000ffffffff
  rdi: 0x0000000000000001  rsi: 0x0000000000000000  rbp: 0x00007fff4fcb3d30  rsp: 0x00007fff4fcb3710
   r8: 0x0000000080000000   r9: 0x0000000000000001  r10: 0x0000000000000008  r11: 0x00000000ffffffff
  r12: 0x0000000000000027  r13: 0x0000000000000001  r14: 0x00007fff4fcb3c98  r15: 0x00007fcac63b54b0
  rip: 0x0000000111255cfd  rfl: 0x0000000000010293  cr2: 0x0000000000000077

Logical CPU:     2
Error Code:      0x00000004
Trap Number:     14

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       0x111357000 -        0x111360ff7 +libsz.2.0.0.dylib (0) <97248DA2-7F01-35B5-BCF5-9F89F0D35498> /usr/local/lib/libsz.2.0.0.dylib
       0x11136b000 -        0x11136ffff +_conv.so (0) <9EA4F7E5-F1E0-30BD-B5E8-4B880D964F4A> /usr/local/lib/python2.7/site-packages/h5py/_conv.so
       0x111375000 -        0x111376ff7 +h5fd.so (0) <61372483-344F-3CA1-A8E3-41F8C10AEB5E> /usr/local/lib/python2.7/site-packages/h5py/h5fd.so
       0x1113bb000 -        0x1113bfff7 +h5r.so (0) <D12DFF5B-666C-34C5-918B-DB43AC188DA9> /usr/local/lib/python2.7/site-packages/h5py/h5r.so
       0x1113c7000 -        0x1113cffff +_objects.so (0) <783B1B65-8448-32F0-ABD5-EA13FEF77AD0> /usr/local/lib/python2.7/site-packages/h5py/_objects.so
       0x1113d8000 -        0x1113e4fff +h5a.so (0) <97D5D869-BBA9-3462-9708-633A2DCA2E07> /usr/local/lib/python2.7/site-packages/h5py/h5a.so
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       0x111c83000 -        0x111e9dfff +libhdf5.8.dylib (0) <9ADE398C-EADE-3A93-BA7A-40DEAF2C2A43> /usr/local/lib/libhdf5.8.dylib
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       0x111f8d000 -        0x111faffff +h5t.so (0) <FE4E339B-A444-385A-A149-517248A93EA5> /usr/local/lib/python2.7/site-packages/h5py/h5t.so
       0x111fd2000 -        0x111fd8fff +h5.so (0) <E06CEE77-85E3-33A5-84B4-547329063A8F> /usr/local/lib/python2.7/site-packages/h5py/h5.so
       0x111fe3000 -        0x111febfff +h5s.so (0) <E7D15B38-4489-33F7-863B-F47CB688A85B> /usr/local/lib/python2.7/site-packages/h5py/h5s.so
       0x111ff7000 -        0x112007fff +h5p.so (0) <E66D3753-B3A7-3F15-A59A-C515AF039C4E> /usr/local/lib/python2.7/site-packages/h5py/h5p.so
       0x112021000 -        0x112025fff +h5ac.so (0) <390C3B3D-0AFC-3C1E-9EB1-3B2EAD8C242B> /usr/local/lib/python2.7/site-packages/h5py/h5ac.so
       0x11202c000 -        0x112030ff7 +_proxy.so (0) <F3A15A1A-D426-3787-A98B-8D7D4D4BDAE5> /usr/local/lib/python2.7/site-packages/h5py/_proxy.so
       0x112035000 -        0x11203eff7 +h5d.so (0) <8F462824-BB4F-3412-9742-557898D9E2DD> /usr/local/lib/python2.7/site-packages/h5py/h5d.so
       0x112049000 -        0x11204eff7 +h5ds.so (0) <E61514BB-DECE-3CF6-8574-1B31C83FCAC0> /usr/local/lib/python2.7/site-packages/h5py/h5ds.so
       0x112056000 -        0x112061fff +h5f.so (0) <7137D206-4B54-3F51-86CD-A412E7359DB4> /usr/local/lib/python2.7/site-packages/h5py/h5f.so
       0x11206e000 -        0x112077fff +h5g.so (0) <0C7BA34F-DF22-337C-B4C5-37811C61BE93> /usr/local/lib/python2.7/site-packages/h5py/h5g.so
       0x112084000 -        0x112088ff7 +h5i.so (0) <3D777019-20BF-3D0D-9FA0-690903761043> /usr/local/lib/python2.7/site-packages/h5py/h5i.so
       0x11208f000 -        0x112092fff +h5z.so (0) <7346C2E1-DFD8-3E12-85D0-DACABE73AF23> /usr/local/lib/python2.7/site-packages/h5py/h5z.so
       0x112099000 -        0x1120a1fff +h5o.so (0) <AFB4534E-CA09-30B2-B9C9-DA2FF13B0BE1> /usr/local/lib/python2.7/site-packages/h5py/h5o.so
       0x1120ad000 -        0x1120b3fff +h5l.so (0) <8E48F1A5-37B3-3483-8801-B9EE537D6B3F> /usr/local/lib/python2.7/site-packages/h5py/h5l.so
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       0x112b2c000 -        0x112b2ffff +_cntr.so (0) <8E9AB92D-4BE4-3E11-839B-34D66E7FB1B6> /Users/USER/Documents/*/_cntr.so
       0x112f41000 -        0x112f71fff +_path.so (0) <BF2582BB-40A1-3488-B6AE-2CDB648560E1> /Users/USER/Documents/*/_path.so
       0x112f9f000 -        0x112fd4fff +_image.so (0) <6FCEE6B6-DDA5-3F7F-8F53-574BD67D6C3F> /Users/USER/Documents/*/_image.so
       0x113009000 -        0x11301eff7 +_png.so (0) <8ABB6685-F9BC-3B43-9D9E-190481FE4188> /Users/USER/Documents/*/_png.so
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       0x11344e000 -        0x113459fff +_delaunay.so (0) <577A0B36-1DB8-303C-B652-938C31D79994> /Users/USER/Documents/*/_delaunay.so
       0x113462000 -        0x11348cfff +_tri.so (0) <C9056676-5B44-3652-BDDA-2886A7568F95> /Users/USER/Documents/*/_tri.so
       0x113742000 -        0x113790fff +_backend_agg.so (0) <F39C0B3B-BC1D-3E51-BE5A-6363C354F9E4> /Users/USER/Documents/*/_backend_agg.so
       0x1137dc000 -        0x1137f6fff +ttconv.so (0) <BC3B3AA9-5CF5-38CA-AA4B-C3672664BA4C> /Users/USER/Documents/*/ttconv.so
       0x113ae5000 -        0x113afdfff +amr_kdtools.so (0) <FA7BC06A-4EB0-397F-B6A9-2B95B9405655> /Users/USER/Documents/*/amr_kdtools.so
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    0x7fff8c30d000 -     0x7fff8c311ff7  libcache.dylib (62) <BDC1E65B-72A1-3DA3-A57C-B23159CAAD0B> /usr/lib/system/libcache.dylib
    0x7fff8c76a000 -     0x7fff8c78efff  libxpc.dylib (300.1.17) <4554927A-9467-365C-91F1-5A116989DD7F> /usr/lib/system/libxpc.dylib
    0x7fff8ca42000 -     0x7fff8cbfaff3  libicucore.A.dylib (511.25) <3ED7B656-416E-3071-AEC8-E85C90232F78> /usr/lib/libicucore.A.dylib
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    0x7fff8cc17000 -     0x7fff8cc17fff  com.apple.Accelerate.vecLib (3.9 - vecLib 3.9) <F8D0CC77-98AC-3B58-9FE6-0C25421827B6> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
    0x7fff8cd97000 -     0x7fff8cd98ff7  libDiagnosticMessagesClient.dylib (100) <4CDB0F7B-C0AF-3424-BC39-495696F0DB1E> /usr/lib/libDiagnosticMessagesClient.dylib
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    0x7fff90ff5000 -     0x7fff90ff6ff7  libSystem.B.dylib (1197.1.1) <BFC0DC97-46C6-3BE0-9983-54A98734897A> /usr/lib/libSystem.B.dylib
    0x7fff92372000 -     0x7fff92383ff7  libsystem_asl.dylib (217.1.4) <655FB343-52CF-3E2F-B14D-BEBF5AAEF94D> /usr/lib/system/libsystem_asl.dylib
    0x7fff924cf000 -     0x7fff926b4ff7  com.apple.CoreFoundation (6.9 - 855.11) <E22C6A1F-8996-349C-905E-96C3BBE07C2F> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7fff92cee000 -     0x7fff92dcdfff  libcrypto.0.9.8.dylib (50) <B95B9DBA-39D3-3EEF-AF43-44608B28894E> /usr/lib/libcrypto.0.9.8.dylib
    0x7fff93768000 -     0x7fff93770fff  libsystem_dnssd.dylib (522.1.11) <270DCF6C-502D-389A-AA9F-DE4624A36FF7> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff93771000 -     0x7fff93778ff7  liblaunch.dylib (842.1.4) <FCBF0A02-0B06-3F97-9248-5062A9DEB32C> /usr/lib/system/liblaunch.dylib
    0x7fff93792000 -     0x7fff93793ff7  libsystem_sandbox.dylib (278.10) <A47E7E11-3C76-318E-B67D-98972B86F094> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff937f7000 -     0x7fff93813ff7  libsystem_kernel.dylib (2422.1.72) <D14913DB-47F1-3591-8DAF-D4B4EF5F8818> /usr/lib/system/libsystem_kernel.dylib
    0x7fff945a6000 -     0x7fff94753f27  libobjc.A.dylib (551.1) <AD7FD984-271E-30F4-A361-6B20319EC73B> /usr/lib/libobjc.A.dylib
    0x7fff948f1000 -     0x7fff949a1ff7  libvMisc.dylib (423.32) <049C0735-1808-39B9-943F-76CB8021744F> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
    0x7fff949a2000 -     0x7fff949d6fff  libssl.0.9.8.dylib (50) <B15F967C-B002-36C2-9621-3456D8509F50> /usr/lib/libssl.0.9.8.dylib
    0x7fff94ac6000 -     0x7fff94acdfff  libcompiler_rt.dylib (35) <4CD916B2-1B17-362A-B403-EF24A1DAC141> /usr/lib/system/libcompiler_rt.dylib
    0x7fff95195000 -     0x7fff95197ff3  libsystem_configuration.dylib (596.12) <C4F633D9-94C8-35D9-BB2D-84C5122533C7> /usr/lib/system/libsystem_configuration.dylib
    0x7fff95198000 -     0x7fff951eafff  libc++.1.dylib (120) <4F68DFC5-2077-39A8-A449-CAC5FDEE7BDE> /usr/lib/libc++.1.dylib
    0x7fff96403000 -     0x7fff96405ff7  libquarantine.dylib (71) <7A1A2BCB-C03D-3A25-BFA4-3E569B2D2C38> /usr/lib/system/libquarantine.dylib
    0x7fff96420000 -     0x7fff96420ff7  libkeymgr.dylib (28) <3AA8D85D-CF00-3BD3-A5A0-E28E1A32A6D8> /usr/lib/system/libkeymgr.dylib
    0x7fff965dd000 -     0x7fff96606ff7  libc++abi.dylib (48) <8C16158F-CBF8-3BD7-BEF4-022704B2A326> /usr/lib/libc++abi.dylib
    0x7fff96772000 -     0x7fff96b53ffe  libLAPACK.dylib (1094.5) <7E7A9B8D-1638-3914-BAE0-663B69865986> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
    0x7fff96f54000 -     0x7fff96f7bffb  libsystem_info.dylib (449.1.3) <7D41A156-D285-3849-A2C3-C04ADE797D98> /usr/lib/system/libsystem_info.dylib
    0x7fff97045000 -     0x7fff97319fc7  com.apple.vImage (7.0 - 7.0) <D241DBFA-AC49-31E2-893D-EAAC31890C90> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
    0x7fff978a6000 -     0x7fff97971fff  libvDSP.dylib (423.32) <3BF732BE-DDE0-38EB-8C54-E4E3C64F77A7> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvDSP.dylib
    0x7fff97a55000 -     0x7fff97a5bff7  libsystem_platform.dylib (24.1.4) <331BA4A5-55CE-3B95-99EB-44E0C89D7FB8> /usr/lib/system/libsystem_platform.dylib
    0x7fff97d96000 -     0x7fff97df9ff7  com.apple.SystemConfiguration (1.13 - 1.13) <F05F4149-981B-380B-8F50-51CE804BBB89> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
    0x7fff97e4a000 -     0x7fff97e4bfff  com.apple.TrustEvaluationAgent (2.0 - 25) <334A82F4-4AE4-3719-A511-86D0B0723E2B> /System/Library/PrivateFrameworks/TrustEvaluationAgent.framework/Versions/A/TrustEvaluationAgent
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    0x7fff9808a000 -     0x7fff9808dff7  libdyld.dylib (239.3) <62F4D752-4089-31A8-8B73-B95A68893B3C> /usr/lib/system/libdyld.dylib
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    0x7fff98b6f000 -     0x7fff98b76ff3  libcopyfile.dylib (103) <5A881779-D0D6-3029-B371-E3021C2DDA5E> /usr/lib/system/libcopyfile.dylib
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    0x7fff98c5d000 -     0x7fff98c62ff7  libunwind.dylib (35.3) <78DCC358-2FC1-302E-B395-0155B47CB547> /usr/lib/system/libunwind.dylib
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    0x7fff994f5000 -     0x7fff9957eff7  libsystem_c.dylib (997.1.1) <61833FAA-7281-3FF9-937F-686B6F20427C> /usr/lib/system/libsystem_c.dylib
    0x7fff9957f000 -     0x7fff99590ff7  libz.1.dylib (53) <42E0C8C6-CA38-3CA4-8619-D24ED5DD492E> /usr/lib/libz.1.dylib
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    0x7fff99af3000 -     0x7fff99c61ff7  libBLAS.dylib (1094.5) <DE93A590-5FA5-32A2-A16C-5D7D7361769F> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 197883
    thread_create: 0
    thread_set_state: 414

VM Region Summary:
ReadOnly portion of Libraries: Total=100.6M resident=30.9M(31%) swapped_out_or_unallocated=69.7M(69%)
Writable regions: Total=118.7M written=69.5M(59%) resident=80.4M(68%) swapped_out=0K(0%) unallocated=38.3M(32%)

REGION TYPE                      VIRTUAL
===========                      =======
Dispatch continuations             8192K
Kernel Alloc Once                     4K
MALLOC                            100.3M
MALLOC (admin)                       16K
STACK GUARD                        56.0M
Stack                              9304K
VM_ALLOCATE                          36K
__DATA                             3028K
__LINKEDIT                         69.8M
__TEXT                             30.7M
__UNICODE                           544K
shared memory                         4K
===========                      =======
TOTAL                             277.5M

Model: MacBookPro10,2, BootROM MBP102.0106.B03, 2 processors, Intel Core i5, 2.6 GHz, 8 GB, SMC 2.6f59
Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738454255302D474E2D4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738454255302D474E2D4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x10F), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports
Network Service: Thunderbolt Ethernet, Ethernet, en3
Network Service: Wi-Fi, AirPort, en0
PCI Card: Apple 57762-A0, Ethernet Controller, Thunderbolt@9,0,0
Serial ATA Device: APPLE SSD SM256E, 251 GB
USB Device: Hub
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Hub
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: Hub
USB Device: Display iSight
USB Device: Apple LED Cinema Display
USB Device: Display Audio
USB Device: Hub
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Pro, Apple Inc., 23.4
Thunderbolt Device: Thunderbolt to Gigabit Ethernet Adapter, Apple Inc., 1, 5.5

I can upload the data somewhere if that would be helpful. This is on the tip of the stable branch.

Bitbucket: https://bitbucket.org/yt_analysis/yt/issue/752

yt-project / yt

Segmentation fault during isocontour extraction #752