#807 Botan unusable when built with 8.1 SEH

[Olivier Croquette]

Steps to reproduce:
Download Botan 2.10.0 from https://github.com/randombit/botan/releases
Configure with: python configure.py --cc=gcc --os=mingw
Build with mingw32-make
Run "botan-test.exe"

With 7.3 SEH, this works perfectly, all tests pass.
With 8.1 SEH, the executable crashes during init:

echo %ERRORLEVEL%
-1073741819

Which is equivalent to C0000005 (access violation).

Confirmed by GDB:

Thread 1 received signal SIGSEGV, Segmentation fault.
0x0000000000b5b70c in __static_initialization_and_destruction_0(int, int) [clone .constprop.101] ()

I am not sure if the problem is in Botan or MinGW64, but since it works with 7.3 and not with 8.1, I thought it makes sense to report it here first.

[Kai Tietz]

Hi,

this issue is most like a g++ issue. I assume that destructor code in
g++ is done in 8.1 version pretty much for sysv-abi only, and
therefore has issues on ms-abi. Of interest is here to isolate the
issue to a small (<100 lines of code) test case. As nobody (not even
we will download a big project, build it, and then try to reproduce.
Btw is LTO used here on built? you could play with building with
different optimization levels, or providing a more complete stack
trace for it. Eg by using gdb, you could use 'gdb --args
botan-test.exe' to get via the bt command after the segfault

Regards,
Kai

Am So., 21. Juli 2019 um 23:42 Uhr schrieb Olivier Croquette
ocroquette@users.sourceforge.net:

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[bugs:#807] Botan unusable when built with 8.1 SEH

Status: open
Group: v1.0 (example)
Created: Sun Jul 21, 2019 09:42 PM UTC by Olivier Croquette
Last Updated: Sun Jul 21, 2019 09:42 PM UTC
Owner: nobody

Steps to reproduce:
Download Botan 2.10.0 from https://github.com/randombit/botan/releases
Configure with: python configure.py --cc=gcc --os=mingw
Build with mingw32-make
Run "botan-test.exe"

With 7.3 SEH, this works perfectly, all tests pass.
With 8.1 SEH, the executable crashes during init:

echo %ERRORLEVEL%
-1073741819

Which is equivalent to C0000005 (access violation).

Confirmed by GDB:

Thread 1 received signal SIGSEGV, Segmentation fault.
0x0000000000b5b70c in __static_initialization_and_destruction_0(int, int) [clone .constprop.101] ()

I am not sure if the problem is in Botan or MinGW64, but since it works with 7.3 and not with 8.1, I thought it makes sense to report it here first.

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[Olivier Croquette]

Thank you for your support. I don't think LTO is used. For now, we will just stick to build Botan with MinGW 7.x. then.