[New-bugs-announce] [issue6178] Core error in Py_EvalFrameEx 2.6.2

[Tim Savannah]

New submission from Tim Savannah <tsavanna at arinc.com>:

I'm getting many segmentation faults (about 1 per half hour) from within
the core of python 2.6.2 on 64-bit machines.

(examples from dmesg:
pythonLaunch.py[13307]: segfault at 0000000000000058 rip
00002b845cfb3550 rsp 0000000041809930 error 4
pythonLaunch.py[27589]: segfault at 0000000000000058 rip
00002b4112287906 rsp 0000000042dab930 error 4
pythonLaunch.py[14436]: segfault at 0000000000000058 rip
00002ae0a4f68550 rsp 0000000042cd9930 error 4
pythonLaunch.py[10374]: segfault at 0000000000000058 rip
00002af43f966906 rsp 000000004214b930 error 4
pythonLaunch.py[17656]: segfault at 0000000000000058 rip
00002aed0cfe8906 rsp 00000000417f0930 error 4
)
pythonLaunch.py is a symbolic link to python 2.6.2 binary.
>From disassembling the python binary, I've found the corrosponding line
in source to be ceval.c:2717

if (tstate->frame->f_exc_type != NULL)

tstate->frame is null, and an access on f_exc_type causes a segfault
(trying to access memory 0x58, see above segfaults).

I can't find any clear code path that could cause tstate->frame to go
null, any suggestions? This is preventing us from moving from python 2.4
32-bit to python 2.6 64-bit.

----------
components: Interpreter Core
messages: 88748
nosy: tsavannah
severity: normal
status: open
title: Core error in Py_EvalFrameEx 2.6.2
type: crash
versions: Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6178>
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