Issue 30385: Segfault on OSX with 3.6.1

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classification

Title:	Segfault on OSX with 3.6.1
Type:	crash	Stage:	resolved
Components:	macOS	Versions:	Python 3.6

process

Status:	closed	Resolution:	duplicate
Dependencies:		Superseder:	_scproxy.so causes EXC_BAD_ACCESS (SIGSEGV) View: 24273
Assigned To:		Nosy List:	Birne94, ThePokestarFan, gromgull, ned.deily, ronaldoussoren
Priority:	normal	Keywords:

Created on 2017-05-17 12:40 by gromgull, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Files
File name	Uploaded	Description	Edit
request_multiprocessing_crash.py	gromgull, 2017-05-17 12:40	crashing program

Messages (6)
msg293849 - (view)	Author: Gunnar Aastrand Grimnes (gromgull)	Date: 2017-05-17 12:40
This script, using requests and multiprocessing, will segfault on MacOS 16.4.0 with python 3.6.1. In 3.6.0 it runs fine. The program is reduced from a much larger program, some weird things need to be present to trigger the crash. For instance the unused tornado imports on the top. Crash log: Process: Python [1510] Path: /usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python Identifier: Python Version: 3.6.1 (3.6.1) Code Type: X86-64 (Native) Parent Process: Python [1509] Responsible: Python [1510] User ID: 501 Date/Time: 2017-05-17 14:23:47.307 +0200 OS Version: Mac OS X 10.12.3 (16D32) Report Version: 12 Anonymous UUID: DB16C70B-F979-86B6-864C-0AC84B0E6402 Sleep/Wake UUID: 03D0B108-E764-4834-A88D-7919CAF9B786 Time Awake Since Boot: 630 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.os.log Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x000000010b692832 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0] VM Regions Near 0x10b692832: VM_ALLOCATE 000000010b652000-000000010b692000 [ 256K] rw-/rwx SM=COW --> shared memory 000000010b6e3000-000000010b6eb000 [ 32K] r--/rw- SM=SHM Application Specific Information: crashed on child side of fork pre-exec Thread 0 Crashed:: Dispatch queue: com.apple.os.log 0 libsystem_trace.dylib 0x00007fffab4bb622 _os_log_cmp_key + 4 1 libsystem_c.dylib 0x00007fffab324144 rb_tree_find_node + 58 2 libsystem_trace.dylib 0x00007fffab4bbb5a __os_log_create_block_invoke + 30 3 libdispatch.dylib 0x00007fffab2460b8 _dispatch_client_callout + 8 4 libdispatch.dylib 0x00007fffab246cf2 _dispatch_barrier_sync_f_invoke + 83 5 libsystem_trace.dylib 0x00007fffab4bb8ac os_log_create + 590 6 com.apple.SystemConfiguration 0x00007fff9c8faafa __SCDynamicStoreCheckRetryAndHandleError + 167 7 com.apple.SystemConfiguration 0x00007fff9c8f9e12 SCDynamicStoreCopyValue + 189 8 com.apple.SystemConfiguration 0x00007fff9c8fe6fb SCDynamicStoreCopyProxiesWithOptions + 560 9 _scproxy.cpython-36m-darwin.so 0x000000010b536911 get_proxy_settings + 24 10 org.python.python 0x000000010a464081 _PyCFunction_FastCallDict + 526 11 org.python.python 0x000000010a4c87d7 call_function + 489 12 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 13 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 14 org.python.python 0x000000010a4c87ae call_function + 448 15 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 16 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 17 org.python.python 0x000000010a4c87ae call_function + 448 18 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 19 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 20 org.python.python 0x000000010a4c87ae call_function + 448 21 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 22 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 23 org.python.python 0x000000010a4c87ae call_function + 448 24 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 25 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 26 org.python.python 0x000000010a4c87ae call_function + 448 27 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 28 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 29 org.python.python 0x000000010a4c985e _PyFunction_FastCallDict + 444 30 org.python.python 0x000000010a42c4d9 _PyObject_FastCallDict + 196 31 org.python.python 0x000000010a42c5fc _PyObject_Call_Prepend + 156 32 org.python.python 0x000000010a42c35a PyObject_Call + 101 33 org.python.python 0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603 34 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 35 org.python.python 0x000000010a4c0207 PyEval_EvalCodeEx + 52 36 org.python.python 0x000000010a44c493 function_call + 338 37 org.python.python 0x000000010a42c35a PyObject_Call + 101 38 org.python.python 0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603 39 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 40 org.python.python 0x000000010a4c9693 fast_function + 227 41 org.python.python 0x000000010a4c87ae call_function + 448 42 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 43 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 44 org.python.python 0x000000010a4c0207 PyEval_EvalCodeEx + 52 45 org.python.python 0x000000010a44c493 function_call + 338 46 org.python.python 0x000000010a42c35a PyObject_Call + 101 47 org.python.python 0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603 48 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 49 org.python.python 0x000000010a4c0207 PyEval_EvalCodeEx + 52 50 org.python.python 0x000000010a44c493 function_call + 338 51 org.python.python 0x000000010a42c35a PyObject_Call + 101 52 org.python.python 0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603 53 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 54 org.python.python 0x000000010a4c87ae call_function + 448 55 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 56 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 57 org.python.python 0x000000010a4c87ae call_function + 448 58 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 59 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 60 org.python.python 0x000000010a4c87ae call_function + 448 61 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 62 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 63 org.python.python 0x000000010a42c4d9 _PyObject_FastCallDict + 196 64 org.python.python 0x000000010a42c5fc _PyObject_Call_Prepend + 156 65 org.python.python 0x000000010a42c35a PyObject_Call + 101 66 org.python.python 0x000000010a477052 slot_tp_init + 57 67 org.python.python 0x000000010a474072 type_call + 184 68 org.python.python 0x000000010a42c4a4 _PyObject_FastCallDict + 143 69 org.python.python 0x000000010a4c87a7 call_function + 441 70 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 71 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 72 org.python.python 0x000000010a4c87ae call_function + 448 73 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 74 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 75 org.python.python 0x000000010a4c87ae call_function + 448 76 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 77 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 78 org.python.python 0x000000010a4c87ae call_function + 448 79 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 80 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 81 org.python.python 0x000000010a4c985e _PyFunction_FastCallDict + 444 82 org.python.python 0x000000010a42c4d9 _PyObject_FastCallDict + 196 83 org.python.python 0x000000010a42c5fc _PyObject_Call_Prepend + 156 84 org.python.python 0x000000010a42c35a PyObject_Call + 101 85 org.python.python 0x000000010a477052 slot_tp_init + 57 86 org.python.python 0x000000010a474072 type_call + 184 87 org.python.python 0x000000010a42c4a4 _PyObject_FastCallDict + 143 88 org.python.python 0x000000010a42c84a _PyObject_FastCallKeywords + 97 89 org.python.python 0x000000010a4c87a7 call_function + 441 90 org.python.python 0x000000010a4c1665 _PyEval_EvalFrameDefault + 5155 91 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 92 org.python.python 0x000000010a4c9693 fast_function + 227 93 org.python.python 0x000000010a4c87ae call_function + 448 94 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 95 org.python.python 0x000000010a4c992e _PyFunction_FastCall + 121 96 org.python.python 0x000000010a4c87ae call_function + 448 97 org.python.python 0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000 98 org.python.python 0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829 99 org.python.python 0x000000010a4c01cd PyEval_EvalCode + 43 100 org.python.python 0x000000010a4e7896 run_mod + 54 101 org.python.python 0x000000010a4e7b76 PyRun_FileExFlags + 180 102 org.python.python 0x000000010a4e7103 PyRun_SimpleFileExFlags + 280 103 org.python.python 0x000000010a4fad40 Py_Main + 3268 104 org.python.python 0x000000010a41fe1d 0x10a41e000 + 7709 105 libdyld.dylib 0x00007fffab27c255 start + 1 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x00007fff557dddf0 rbx: 0x00007fb62371bda0 rcx: 0x0030000000000203 rdx: 0x00007fff557dde20 rdi: 0x000000010b692830 rsi: 0x00007fb62371bda0 rbp: 0x00007fff557ddd90 rsp: 0x00007fff557ddd58 r8: 0x0000000000000001 r9: 0x0000000000000048 r10: 0x00000000ffffffff r11: 0xffffffffb8e7ea1f r12: 0x00007fffb40ccf58 r13: 0x00007fffab4bb61e r14: 0x00007fff557dde20 r15: 0x00007fb62371bdb0 rip: 0x00007fffab4bb622 rfl: 0x0000000000010206 cr2: 0x000000010b692832 Logical CPU: 1 Error Code: 0x00000004 Trap Number: 14 Binary Images: 0x10a41e000 - 0x10a41ffff +org.python.python (3.6.1 - 3.6.1) 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/usr/lib/system/libsystem_networkextension.dylib 0x7fffab47d000 - 0x7fffab486ff3 libsystem_notify.dylib (165.20.1) <E7FD3A7C-DD07-36E2-9FA4-7561F9F114DA> /usr/lib/system/libsystem_notify.dylib 0x7fffab487000 - 0x7fffab48ffe7 libsystem_platform.dylib (126.1.2) <3CA06D4E-C00A-36DE-AA65-3A390097D1F6> /usr/lib/system/libsystem_platform.dylib 0x7fffab490000 - 0x7fffab49aff7 libsystem_pthread.dylib (218.30.1) <C869ED7C-BE29-3532-8E69-3A8DA1447EDC> /usr/lib/system/libsystem_pthread.dylib 0x7fffab49b000 - 0x7fffab49eff7 libsystem_sandbox.dylib (592.31.1) <7BBFDF96-293F-3DD9-B3A4-7C168280B441> /usr/lib/system/libsystem_sandbox.dylib 0x7fffab49f000 - 0x7fffab4a0fff libsystem_secinit.dylib (24) <5C1F1E47-0F7D-3E25-8DEB-D9DB1F902281> /usr/lib/system/libsystem_secinit.dylib 0x7fffab4a1000 - 0x7fffab4a8fff libsystem_symptoms.dylib (532.30.6) <5D990CF5-B58F-39F7-B375-99B4EC62CFBD> /usr/lib/system/libsystem_symptoms.dylib 0x7fffab4a9000 - 0x7fffab4c9ff7 libsystem_trace.dylib (518.30.7) <6D34D1EA-2A3C-3D2D-803E-A666E6AEEE52> /usr/lib/system/libsystem_trace.dylib 0x7fffab4ca000 - 0x7fffab4cfffb libunwind.dylib (35.3) <9F7C2AD8-A9A7-3DE4-828D-B0F0F166AAA0> /usr/lib/system/libunwind.dylib 0x7fffab4d0000 - 0x7fffab4f9ff7 libxpc.dylib (972.30.7) <65E41BB6-EBD5-3D93-B0BE-B190CEE4DD93> /usr/lib/system/libxpc.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: 871 thread_create: 0 thread_set_state: 0 VM Region Summary: ReadOnly portion of Libraries: Total=139.6M resident=0K(0%) swapped_out_or_unallocated=139.6M(100%) Writable regions: Total=76.8M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=76.8M(100%) VIRTUAL REGION REGION TYPE SIZE COUNT (non-coalesced) =========== ======= ======= Activity Tracing 256K 2 Dispatch continuations 8192K 2 Kernel Alloc Once 8K 2 MALLOC 40.7M 14 MALLOC guard page 16K 4 MALLOC_LARGE (reserved) 128K 2 reserved VM address space (unallocated) STACK GUARD 4K 2 Stack 17.5M 5 Stack Guard 12K 4 VM_ALLOCATE 10.0M 25 __DATA 4416K 100 __LINKEDIT 112.5M 39 __TEXT 27.1M 99 __UNICODE 556K 2 shared memory 44K 5 =========== ======= ======= TOTAL 221.1M 292 TOTAL, minus reserved VM space 221.0M 292 Model: MacBookPro12,1, BootROM MBP121.0167.B21, 2 processors, Intel Core i5, 2,9 GHz, 16 GB, SMC 2.28f7 Graphics: Intel Iris Graphics 6100, Intel Iris Graphics 6100, Built-In Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000 Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000 AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x133), Broadcom BCM43xx 1.0 (7.21.171.68.1a5) Bluetooth: Version 5.0.3f1, 3 services, 17 devices, 1 incoming serial ports Network Service: Wi-Fi, AirPort, en0 Serial ATA Device: APPLE SSD SM0512G, 500,28 GB USB Device: USB 3.0 Bus USB Device: Hub USB Device: Hub USB Device: Bluetooth USB Host Controller USB Device: Hub USB Device: Microsoft USB Optical Mouse USB Device: USB2.0 Hub USB Device: daskeyboard USB Device: Hub Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1
msg293851 - (view)	Author: Gunnar Aastrand Grimnes (gromgull)	Date: 2017-05-17 13:07
I am unable to reduce it to a small(ish) test-case like for 3.6.1, but I can also get 2.7.1 to seg fault in my original program, and the stack trace is similar: Process: Python [4023] Path: /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python Identifier: Python Version: 2.7.11 (2.7.11) Code Type: X86-64 (Native) Parent Process: Python [4018] Responsible: Python [4023] User ID: 501 Date/Time: 2017-05-17 15:04:48.824 +0200 OS Version: Mac OS X 10.12.3 (16D32) Report Version: 12 Anonymous UUID: DB16C70B-F979-86B6-864C-0AC84B0E6402 Sleep/Wake UUID: 03D0B108-E764-4834-A88D-7919CAF9B786 Time Awake Since Boot: 3000 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.os.log Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x000000010617c832 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0] VM Regions Near 0x10617c832: VM_ALLOCATE 000000010603c000-000000010617c000 [ 1280K] rw-/rwx SM=COW --> VM_ALLOCATE 00000001061bc000-00000001062fc000 [ 1280K] rw-/rwx SM=COW Application Specific Information: crashed on child side of fork pre-exec Thread 0 Crashed:: Dispatch queue: com.apple.os.log 0 libsystem_trace.dylib 0x00007fffab4bb622 _os_log_cmp_key + 4 1 libsystem_c.dylib 0x00007fffab324144 rb_tree_find_node + 58 2 libsystem_trace.dylib 0x00007fffab4bbb5a __os_log_create_block_invoke + 30 3 libdispatch.dylib 0x00007fffab2460b8 _dispatch_client_callout + 8 4 libdispatch.dylib 0x00007fffab246cf2 _dispatch_barrier_sync_f_invoke + 83 5 libsystem_trace.dylib 0x00007fffab4bb8ac os_log_create + 590 6 com.apple.SystemConfiguration 0x00007fff9c8faafa __SCDynamicStoreCheckRetryAndHandleError + 167 7 com.apple.SystemConfiguration 0x00007fff9c8f9e12 SCDynamicStoreCopyValue + 189 8 com.apple.SystemConfiguration 0x00007fff9c8fe6fb 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PyEval_EvalCodeEx + 1583 40 org.python.python 0x00000001044c669a fast_function + 117 41 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640 42 org.python.python 0x0000000104458398 gen_send_ex + 191 43 org.python.python 0x00000001044c2cd2 PyEval_EvalFrameEx + 27119 44 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583 45 org.python.python 0x00000001044c669a fast_function + 117 46 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640 47 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583 48 org.python.python 0x0000000104460fb1 function_call + 352 49 org.python.python 0x0000000104442eb0 PyObject_Call + 99 50 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593 51 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583 52 org.python.python 0x0000000104460fb1 function_call + 352 53 org.python.python 0x0000000104442eb0 PyObject_Call + 99 54 _functools.so 0x00000001048587b7 partial_call + 189 55 org.python.python 0x0000000104442eb0 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X86 Thread State (64-bit): rax: 0x00007fff5b7c5e20 rbx: 0x00007fc049a24ca0 rcx: 0x0030000000000203 rdx: 0x00007fff5b7c5e50 rdi: 0x000000010617c830 rsi: 0x00007fc049a24ca0 rbp: 0x00007fff5b7c5dc0 rsp: 0x00007fff5b7c5d88 r8: 0x0000000000000001 r9: 0x0000000000000048 r10: 0x00000000ffffffff r11: 0xffffffffbee66a4f r12: 0x00007fffb40ccf58 r13: 0x00007fffab4bb61e r14: 0x00007fff5b7c5e50 r15: 0x00007fc049a24cb0 rip: 0x00007fffab4bb622 rfl: 0x0000000000010206 cr2: 0x000000010617c832 Logical CPU: 3 Error Code: 0x00000004 Trap Number: 14 Binary Images: 0x104430000 - 0x104431fff +org.python.python (2.7.11 - 2.7.11) <6BAE76DA-21F3-361A-9D58-50D270E8B694> /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python 0x104438000 - 0x10452eff7 +org.python.python (2.7.11, [c] 2001-2015 Python Software Foundation. - 2.7.11) <C2EDCA79-DEA7-3EF8-953D-6303BB6F7FEE> /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/Python 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libdispatch.dylib (703.30.5) <EA0CC14E-D559-3802-B4B2-0E8C7579AAC4> /usr/lib/system/libdispatch.dylib 0x7fffab277000 - 0x7fffab27cff3 libdyld.dylib (421.2) <6F506653-FFF6-3DB8-84F1-109AE3C52F32> /usr/lib/system/libdyld.dylib 0x7fffab27d000 - 0x7fffab27dffb libkeymgr.dylib (28) <1A318923-1200-3B06-B432-5007D82F195D> /usr/lib/system/libkeymgr.dylib 0x7fffab27e000 - 0x7fffab28affb libkxld.dylib (3789.41.3) <87550136-9353-348B-9CD9-C342B48C5AAF> /usr/lib/system/libkxld.dylib 0x7fffab28b000 - 0x7fffab28bfff liblaunch.dylib (972.30.7) <15FACC21-079A-3BDF-9AFB-4253EFDEB587> /usr/lib/system/liblaunch.dylib 0x7fffab28c000 - 0x7fffab291fff libmacho.dylib (894) <A2F38EC1-C37C-3B93-B0E4-36B07C177F8C> /usr/lib/system/libmacho.dylib 0x7fffab292000 - 0x7fffab294ff3 libquarantine.dylib (85) <C1D7749F-5F5F-3BB9-BEFC-1F0B9DA941FD> /usr/lib/system/libquarantine.dylib 0x7fffab295000 - 0x7fffab296ffb libremovefile.dylib (45) <CD42974E-BE0B-39FC-9BFC-8A7540A04DC6> /usr/lib/system/libremovefile.dylib 0x7fffab297000 - 0x7fffab2afff7 libsystem_asl.dylib (349.30.2) <EFAC72D7-CB13-3DF7-ADF3-EC6635C6F1EA> /usr/lib/system/libsystem_asl.dylib 0x7fffab2b0000 - 0x7fffab2b0ff7 libsystem_blocks.dylib (67) <B8C3701D-5A91-3D35-999D-2DC8D5393525> /usr/lib/system/libsystem_blocks.dylib 0x7fffab2b1000 - 0x7fffab33efef libsystem_c.dylib (1158.30.7) <2F881962-03CB-3B9D-A782-D98C1BBA4E3D> /usr/lib/system/libsystem_c.dylib 0x7fffab33f000 - 0x7fffab342ffb libsystem_configuration.dylib (888.30.2) <4FE3983C-E4ED-3939-A578-03AD29C99788> /usr/lib/system/libsystem_configuration.dylib 0x7fffab343000 - 0x7fffab346fff libsystem_coreservices.dylib (41.4) <1A572B9E-0C47-320F-8C64-7990D0A5FB5A> /usr/lib/system/libsystem_coreservices.dylib 0x7fffab347000 - 0x7fffab35fff3 libsystem_coretls.dylib (121.31.1) <4676F06D-274D-31BE-B61C-4D7A4AEF4858> /usr/lib/system/libsystem_coretls.dylib 0x7fffab360000 - 0x7fffab366fff libsystem_dnssd.dylib (765.30.11) <DC708D84-ED7D-3936-B996-A67C66B8DDAA> 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<E7FD3A7C-DD07-36E2-9FA4-7561F9F114DA> /usr/lib/system/libsystem_notify.dylib 0x7fffab487000 - 0x7fffab48ffe7 libsystem_platform.dylib (126.1.2) <3CA06D4E-C00A-36DE-AA65-3A390097D1F6> /usr/lib/system/libsystem_platform.dylib 0x7fffab490000 - 0x7fffab49aff7 libsystem_pthread.dylib (218.30.1) <C869ED7C-BE29-3532-8E69-3A8DA1447EDC> /usr/lib/system/libsystem_pthread.dylib 0x7fffab49b000 - 0x7fffab49eff7 libsystem_sandbox.dylib (592.31.1) <7BBFDF96-293F-3DD9-B3A4-7C168280B441> /usr/lib/system/libsystem_sandbox.dylib 0x7fffab49f000 - 0x7fffab4a0fff libsystem_secinit.dylib (24) <5C1F1E47-0F7D-3E25-8DEB-D9DB1F902281> /usr/lib/system/libsystem_secinit.dylib 0x7fffab4a1000 - 0x7fffab4a8fff libsystem_symptoms.dylib (532.30.6) <5D990CF5-B58F-39F7-B375-99B4EC62CFBD> /usr/lib/system/libsystem_symptoms.dylib 0x7fffab4a9000 - 0x7fffab4c9ff7 libsystem_trace.dylib (518.30.7) <6D34D1EA-2A3C-3D2D-803E-A666E6AEEE52> /usr/lib/system/libsystem_trace.dylib 0x7fffab4ca000 - 0x7fffab4cfffb libunwind.dylib (35.3) <9F7C2AD8-A9A7-3DE4-828D-B0F0F166AAA0> /usr/lib/system/libunwind.dylib 0x7fffab4d0000 - 0x7fffab4f9ff7 libxpc.dylib (972.30.7) <65E41BB6-EBD5-3D93-B0BE-B190CEE4DD93> /usr/lib/system/libxpc.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: 2716 thread_create: 0 thread_set_state: 0 VM Region Summary: ReadOnly portion of Libraries: Total=142.2M resident=0K(0%) swapped_out_or_unallocated=142.2M(100%) Writable regions: Total=101.7M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=101.7M(100%) VIRTUAL REGION REGION TYPE SIZE COUNT (non-coalesced) =========== ======= ======= Activity Tracing 256K 2 Dispatch continuations 8192K 2 Kernel Alloc Once 8K 2 MALLOC 61.6M 16 MALLOC guard page 16K 4 STACK GUARD 56.0M 2 Stack 9752K 5 Stack Guard 12K 4 VM_ALLOCATE 22.3M 34 __DATA 4580K 118 __LINKEDIT 113.3M 51 __TEXT 28.9M 114 __UNICODE 556K 2 shared memory 44K 6 =========== ======= ======= TOTAL 304.9M 348 Model: MacBookPro12,1, BootROM MBP121.0167.B21, 2 processors, Intel Core i5, 2,9 GHz, 16 GB, SMC 2.28f7 Graphics: Intel Iris Graphics 6100, Intel Iris Graphics 6100, Built-In Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000 Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000 AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x133), Broadcom BCM43xx 1.0 (7.21.171.68.1a5) Bluetooth: Version 5.0.3f1, 3 services, 17 devices, 1 incoming serial ports Network Service: Wi-Fi, AirPort, en0 Serial ATA Device: APPLE SSD SM0512G, 500,28 GB USB Device: USB 3.0 Bus USB Device: Hub USB Device: Hub USB Device: Bluetooth USB Host Controller USB Device: Hub USB Device: Microsoft USB Optical Mouse USB Device: USB2.0 Hub USB Device: daskeyboard USB Device: Hub Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1
msg293955 - (view)	Author: Daniel Birnstiel (Birne94) *	Date: 2017-05-19 12:33
I am currently (occasionally) running into the same problem, using Python 3.6.0 on OSX 10.12.3. I cannot reproduce this segmentation fault reliably, it happens after running for a while in production. This appears to be similar to issue 13829. python traceback (trimmed): Fatal Python error: Segmentation fault Current thread 0x00007000065fb000 (most recent call first): File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 2592 in proxy_bypass_macosx_sysconf File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 2616 in proxy_bypass File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/utils.py", line 677 in should_bypass_proxies File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/utils.py", line 693 in get_environ_proxies File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/sessions.py", line 686 in merge_environment_settings File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/sessions.py", line 509 in request File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/api.py", line 58 in request crash dump traceback (trimmed): * thread #1: tid = 0x0000, 0x00007fffc1ef0dd6 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGSTOP * frame #0: 0x00007fffc1ef0dd6 libsystem_kernel.dylib`__pthread_kill + 10 frame #1: 0x00007fffc1fdc787 libsystem_pthread.dylib`pthread_kill + 90 frame #2: 0x00007fffc1e07497 libsystem_c.dylib`raise + 26 frame #3: 0x00007fffc1fcfbba libsystem_platform.dylib`_sigtramp + 26 frame #4: 0x00007fffc1da188f libdispatch.dylib`_dispatch_queue_push + 172 frame #5: 0x00007fffc1d91572 libdispatch.dylib`_dispatch_mach_msg_send + 657 frame #6: 0x00007fffc1d924ba libdispatch.dylib`_dispatch_mach_send_drain + 280 frame #7: 0x00007fffc1da91ea libdispatch.dylib`_dispatch_mach_send_push_and_trydrain + 487 frame #8: 0x00007fffc1da6745 libdispatch.dylib`_dispatch_mach_send_msg + 282 frame #9: 0x00007fffc1da6804 libdispatch.dylib`dispatch_mach_send_with_result + 50 frame #10: 0x00007fffc201f25e libxpc.dylib`_xpc_connection_enqueue + 104 frame #11: 0x00007fffc201eca3 libxpc.dylib`xpc_connection_send_message_with_reply + 152 frame #12: 0x00007fffac99b8e5 CoreFoundation`__80-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:]_block_invoke_2 + 133 frame #13: 0x00007fffac9cb4e4 CoreFoundation`-[_CFXPreferences withConnectionForRole:performBlock:] + 36 frame #14: 0x00007fffac99b817 CoreFoundation`__80-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:]_block_invoke + 199 frame #15: 0x00007fffac99b662 CoreFoundation`-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:] + 226 frame #16: 0x00007fffac81ee80 CoreFoundation`-[CFPrefsSearchListSource alreadylocked_copyDictionary] + 336 frame #17: 0x00007fffac81eb5c CoreFoundation`-[CFPrefsSearchListSource alreadylocked_copyValueForKey:] + 60 frame #18: 0x00007fffac94dd75 CoreFoundation`-[CFPrefsSource copyValueForKey:] + 53 frame #19: 0x00007fffac9c9b00 CoreFoundation`__76-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:]_block_invoke + 32 frame #20: 0x00007fffac99ca32 CoreFoundation`__108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke + 290 frame #21: 0x00007fffac99c8a9 CoreFoundation`-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] + 345 frame #22: 0x00007fffac9c9a66 CoreFoundation`-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:] + 310 frame #23: 0x00007fffb343a56f SystemConfiguration`SCDynamicStoreCopyProxiesWithOptions + 164 frame #24: 0x000000010b36f926 _scproxy.cpython-36m-darwin.so`get_proxy_settings + 24 frame #25: 0x000000010942148b Python`_PyCFunction_FastCallDict + 529 frame #26: 0x0000000109488959 Python`call_function + 562 frame #27: 0x0000000109485d10 Python`_PyEval_EvalFrameDefault + 26835
msg293958 - (view)	Author: Ned Deily (ned.deily) *	Date: 2017-05-19 15:21
Unfortunately, his is a long standing problem when using Python applications that fork on macOS and that end up calling certain system frameworks that under the covers use the system libdispatch which is not fork safe. In this case, it is most likely due to a call to s urllib function that results in a call to Python's helper module _scproxy to query the macOS system configuration for network proxies. If your application and system are not using a proxy, the simplest workaround is to disable network proxy lookups by defining the environment variable 'no_proxy' with value '' in the Python process, for example: env no_proxy='' python3.6 ... Otherwise, restructuring your code to ensure network initialization occurs in the main thread before any forking might also prevent the segfault.
msg294136 - (view)	Author: Gunnar Aastrand Grimnes (gromgull)	Date: 2017-05-22 09:33
Adding env no_proxy='*' does indeed fix it! Thanks a lot! I guess it's pretty hard to fix. Or even to detect, so that one could log a warning before dying :(
msg355810 - (view)	Author: (ThePokestarFan) *	Date: 2019-11-01 11:41
A pythonic way to do it is `os.environ[“no_proxy”]=“*”`

History
Date	User	Action	Args
2022-04-11 14:58:46	admin	set	github: 74570
2019-11-01 11:41:59	ThePokestarFan	set	nosy: + ThePokestarFan messages: + msg355810
2017-05-22 09:33:46	gromgull	set	messages: + msg294136
2017-05-19 15:21:23	ned.deily	set	status: open -> closed superseder: _scproxy.so causes EXC_BAD_ACCESS (SIGSEGV) messages: + msg293958 resolution: duplicate stage: resolved
2017-05-19 12:33:02	Birne94	set	nosy: + Birne94 messages: + msg293955
2017-05-17 13:07:29	gromgull	set	messages: + msg293851
2017-05-17 12:40:55	gromgull	create