Christian Heimes added the comment:
internal_setblocking() sets an exception w/o holding the GIL.
#0 0x00007ffff711f6f5 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
#1 0x00007ffff71212fa in __GI_abort () at abort.c:89
#2 0x000000000042935f in Py_FatalError (msg=0x83d8f8 "Python memory allocator
called without holding the GIL")
at Python/pylifecycle.c:1457
#3 0x000000000042138f in _PyMem_DebugCheckGIL () at Objects/obmalloc.c:1972
#4 0x00000000004214ae in _PyMem_DebugFree (ctx=0xad8bf0 <_PyMem_Debug+48>,
ptr=0xcf8b40) at Objects/obmalloc.c:1994
#5 0x000000000041e9cb in PyMem_Free (ptr=0xcf8b40) at Objects/obmalloc.c:442
#6 0x000000000046f7ed in _PyFaulthandler_Fini () at
./Modules/faulthandler.c:1369
#7 0x0000000000429303 in Py_FatalError (msg=0x83d8f8 "Python memory allocator
called without holding the GIL")
at Python/pylifecycle.c:1431
#8 0x000000000042138f in _PyMem_DebugCheckGIL () at Objects/obmalloc.c:1972
#9 0x00000000004213d0 in _PyMem_DebugMalloc (ctx=0xad8c20 <_PyMem_Debug+96>,
nbytes=84) at Objects/obmalloc.c:1980
#10 0x000000000041eb6b in PyObject_Malloc (size=84) at Objects/obmalloc.c:479
#11 0x00000000005c0a19 in PyUnicode_New (size=19, maxchar=116) at
Objects/unicodeobject.c:1280
#12 0x00000000005c8e0e in PyUnicode_FromUnicode (u=0xd26450 L"Bad file
descriptor", size=19) at Objects/unicodeobject.c:2016
#13 0x00000000005ce90f in PyUnicode_FromWideChar (w=0xd26450 L"Bad file
descriptor", size=19) at Objects/unicodeobject.c:2497
#14 0x00000000005d48f0 in PyUnicode_DecodeLocaleAndSize (str=0x7ffff7273e98
"Bad file descriptor", len=19,
errors=0x8747bb "surrogateescape") at Objects/unicodeobject.c:3729
#15 0x00000000005d4f86 in PyUnicode_DecodeLocale (str=0x7ffff7273e98 "Bad file
descriptor", errors=0x8747bb "surrogateescape")
at Objects/unicodeobject.c:3802
#16 0x0000000000717924 in PyErr_SetFromErrnoWithFilenameObjects (exc=<type at
remote 0xafee40>, filenameObject=0x0, filenameObject2=0x0)
at Python/errors.c:448
#17 0x0000000000717f00 in PyErr_SetFromErrno (exc=<type at remote 0xafee40>) at
Python/errors.c:553
#18 0x00007ffff03000b0 in internal_setblocking (s=0x7fffeb3e1d48, block=1) at
/home/heimes/dev/python/cpython/Modules/socketmodule.c:667
#19 0x00007ffff030597a in sock_setblocking (s=0x7fffeb3e1d48, arg=False) at
/home/heimes/dev/python/cpython/Modules/socketmodule.c:2445
#20 0x000000000054a2ce in _PyCFunction_FastCallDict (func_obj=<built-in method
setblocking of socket object at remote 0x7fffeb3e1d48>,
args=0xef4058, nargs=1, kwargs=0x0) at Objects/methodobject.c:209
#21 0x000000000054a963 in _PyCFunction_FastCallKeywords (func=<built-in method
setblocking of socket object at remote 0x7fffeb3e1d48>,
stack=0xef4058, nargs=1, kwnames=0x0) at Objects/methodobject.c:295
#22 0x00000000006e306c in call_function (pp_stack=0x7ffffffe9088, oparg=1,
kwnames=0x0) at Python/ceval.c:4787
----------
nosy: +christian.heimes
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<http://bugs.python.org/issue28471>
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