https://bugs.kde.org/show_bug.cgi?id=384261
Bug ID: 384261
Summary: Assert failure on helgrind with the SIDT instruction
Product: valgrind
Version: 3.13.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: helgrind
Assignee: jsew...@acm.org
Reporter: amadva...@gmail.com
Target Milestone: ---
A program that uses threading and the SIDT instruction makes helgrind to fail
with the assertion failure:
Helgrind: hg_main.c:4478 (instrument_mem_access): Assertion 'szB > 8 && szB <=
512' failed.
In my understanding this happens because instrument_mem_access() expects memory
accesses of size 1,2,4 and >=8 bytes, but not of 6 bytes, like the SIDT
instruction is doing.
Just changing the assert in hg_main.c to allow szB==6 makes helgrind to work.
I'm using valgrind 13.0 compiled from source in a Ubuntu 14.04 x64 system
running a 32 bit program.
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