[issue22503] Signal stack overflow in faulthandler_user

[STINNER Victor]

STINNER Victor  added the comment:

Python 3 is built frequently on the Fedora infra on AArch64 and the 
test_faulthandler test doesn't fail there. Recent example of build:
https://koji.fedoraproject.org/koji/buildinfo?buildID=1236594

Direct link to AArch64 build logs (build.log):
https://kojipkgs.fedoraproject.org//packages/python3/3.7.2/5.fc29/data/logs/aarch64/build.log

Extract:

0:02:37 load avg: 5.99 [177/414] test_faulthandler passed (41 sec 925 ms) -- 
running: test_concurrent_futures (1 min 30 sec)
...
0:03:10 load avg: 10.21 [190/414] test_faulthandler passed (1 min 2 sec) -- 
running: test_gdb (44 sec 52 ms), test_concurrent_futures (1 min 56 sec)

The test is run on a Python compiled in release mode then on a Python compiled 
in debug mode. The test pass in both cases.

I close the issue. It seems like the bug has been fixed indirectly since this 
bug has been reported.

Thanks for your bug report Andreas Schwab :-)

--
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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[issue22503] Signal stack overflow in faulthandler_user

[Cheryl Sabella]

Cheryl Sabella  added the comment:

The bug ticket link provided by @schwab was resolved as closed in 2015.  Is 
this ticket still an issue on aarch64?  

Other tickets with same error on other platforms: Issue35484, Issue21131

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nosy: +cheryl.sabella

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[issue22503] Signal stack overflow in faulthandler_user

[STINNER Victor]

STINNER Victor added the comment:

_PyFaulthandler_Init() uses sigaltstack() with a stack of SIGSTKSZ bytes. On my 
Linux/x86_64, SIGSTKSZ is 8 KB.

What is the value of SIGSTKSZ on aarch64? Is there a C define (#ifdef) to use a 
different size on this architecture? Does the test pass if you modify 
faulthandler.c to use SIGSTKSZ * 2?

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[issue22503] Signal stack overflow in faulthandler_user

[Andreas Schwab]

Andreas Schwab added the comment:

There is an open bug about MINSIGSTKSZ being too small on aarch64 
https://sourceware.org/bugzilla/show_bug.cgi?id=16850.
How much SIGSTKSZ can guarantee about nested signals is unclear.  POSIX does 
not appear give any guidance.  On aarch64 SIGSTKSZ is defined to 8192, which is 
the default for architectures not overriding it (both in glibc and the kernel 
headers).

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[issue22503] Signal stack overflow in faulthandler_user

[Andreas Schwab]

New submission from Andreas Schwab:

test_register_chain fails on aarch64 due to signal stack overflow, when 
re-raising the signal in faulthandler_user.  The problem is that the signal 
stack can only handle a single signal frame, but faulthandler_user adds a 
second one.  _Py_Faulthandler_Init should allocate twice the amount of stack to 
cater for the two signal frames.

==
FAIL: test_register_chain (test.test_faulthandler.FaultHandlerTests)
--
Traceback (most recent call last):
  File 
/home/abuild/rpmbuild/BUILD/Python-3.4.1/Lib/test/test_faulthandler.py, line 
592, in test_register_chain
self.check_register(chain=True)
  File 
/home/abuild/rpmbuild/BUILD/Python-3.4.1/Lib/test/test_faulthandler.py, line 
576, in check_register
self.assertEqual(exitcode, 0)
AssertionError: -11 != 0

--

--
components: Extension Modules
messages: 227667
nosy: schwab
priority: normal
severity: normal
status: open
title: Signal stack overflow in faulthandler_user
type: resource usage
versions: Python 3.4

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[issue22503] Signal stack overflow in faulthandler_user

[R. David Murray]

Changes by R. David Murray rdmur...@bitdance.com:


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