https://bugs.kde.org/show_bug.cgi?id=462553
Bug ID: 462553
Summary: -mpreferred-stack-boundary=2 on 32 bit x86 causes
crashes when SSE is also enabled (e.g. used by glibc)
Classification: Developer tools
Product: valgrind
Version: 3.20.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: alex.kana...@gmail.com
Target Milestone: ---
Valgrind build itself with -mpreferred-stack-boundary=2 on x86 (32 bit)
targets. On the other hand, SSE instructions expect things to be aligned on 16
byte boundary (e.g. -mpreferred-stack-boundary=4). This won't be reported at
compile time and results in crashes at runtime, e.g. vgdb simply does not work
at all and crashes out immediately when calling into glibc code which moves
things to and from XMM registers (because it was built with SSE enabled).
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