Neil Schemenauer added the comment:
I reverted because of the crash in test_threading. I'm pretty sure there is a
bug with the locking of bufferedio.c, related to threads and flush. Here is
the stacktrace I get (my patch applied, I'm trying to write a Python test that
triggers the SEGV without my flush patch).
Attached is the script that triggers the crash.
Thread 3 received signal SIGSEGV, Segmentation fault.
0x00000001000c06d4 in PyObject_GetAttr (
v=<unknown at remote 0xdbdbdbdbdbdbdbdb>, name='seek')
at ../Objects/object.c:882
882 PyTypeObject *tp = Py_TYPE(v);
(gdb) bt
#0 0x00000001000c06d4 in PyObject_GetAttr (
v=<unknown at remote 0xdbdbdbdbdbdbdbdb>, name='seek')
at ../Objects/object.c:882
#1 0x00000001000440e9 in PyObject_CallMethodObjArgs (
callable=<unknown at remote 0xdbdbdbdbdbdbdbdb>, name='seek')
at ../Objects/call.c:1212
#2 0x00000001003005a2 in _buffered_raw_seek (self=0x1053a39b8, target=0,
whence=1) at ../Modules/_io/bufferedio.c:742
#3 0x000000010030015e in buffered_flush_and_rewind_unlocked (self=0x1053a39b8)
at ../Modules/_io/bufferedio.c:851
#4 0x00000001002fed12 in buffered_flush (self=0x1053a39b8, args=0x0)
at ../Modules/_io/bufferedio.c:869
#5 0x00000001002feb4d in _PyIO_atexit_flush ()
at ../Modules/_io/bufferedio.c:1863
[...]
----------
Added file: http://bugs.python.org/file47121/buffer_crash.py
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<http://bugs.python.org/issue17852>
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