https://bugs.kde.org/show_bug.cgi?id=499212
Bug ID: 499212
Summary: mmap() with MAP_ALIGNED() returns unaligned pointer
under memcheck
Classification: Developer tools
Product: valgrind
Version: 3.24 GIT
Platform: FreeBSD Ports
OS: FreeBSD
Status: REPORTED
Severity: minor
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: bugs.kde....@sjh.sh
Target Milestone: ---
Created attachment 177726
--> https://bugs.kde.org/attachment.cgi?id=177726&action=edit
Simple program to test alignment of mmap() result
SUMMARY
When running under valgriund, the pointer returned by mmap(NULL, 1<<20,
PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_NOSYNC | MAP_ALIGNED(20), -1 ,0) is
not correctly aligned.
STEPS TO REPRODUCE
1. Call mmap() with MAP_ALIGNED(20) flag on FreeBSD
OBSERVED RESULT
Pointer is one page past alignment
EXPECTED RESULT
Pointer is aligned as requested
SOFTWARE/OS VERSIONS
FreeBSD: 14.2-RELEASE
ADDITIONAL INFORMATION
Test case attached.
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