Re: [Valgrind-users] Spurious Assertion from valgrind

[Mark W. <mj...@re...>]

On Wed, 2016-10-19 at 09:29 -0400, Eric Chamberland wrote:
> I recently upgraded to valgrind 3.11.0 (was 3.8.1 before).
> I also upgraded Intel MKL to the 2015 version.
> 
> We use valgrind since 2011-10-27 to test our code nightly with about 
> 2200 tests.
> 
> Since this upgrade, some tests (not always the same) have the same 
> trouble (see full log in attachment):
> 
> ================================
> ...
> blockSane: fail -- redzone-hi
> 
> valgrind: m_mallocfree.c:2042 (vgPlain_arena_free): Assertion 
> 'blockSane(a, b)' failed.
> 
> host stacktrace:
> ...
> 
> ================================
> 
> I would like some help to debug this.
> 
> It is quite annoying since for the same test, the problem appear or 
> disappear from one day over another...
> 
> Today we got the problem on 6 tests (on 2200), yesterday, only 1 test 
> failed, before yesterday, none failed....
> 
> Thanks for any insights or clues!

I believe this is https://bugs.kde.org/show_bug.cgi?id=356457
Sadly it is not well understood. If you could add any information to
that bug that could help us understand better when this issue triggers
that would be very helpful. There are some hints in that bug report how
to get more information if possible.

Thanks,

Mark