https://bugs.kde.org/show_bug.cgi?id=410757
Bug ID: 410757
Summary: glibc wrapper discrepancy for preadv2/pwritev2 system
calls across different versions
Product: valgrind
Version: 3.15 SVN
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: stefan.maksimo...@rt-rk.com
CC: mips3...@gmail.com
Target Milestone: ---
Running the memcheck/tests/linux/sys-preadv2_pwritev2 test on a system with
glibc v2.27 and v2.28 we experienced
a failure which manifested itself in additional output on stderr.
Namely, in addition to the expected output for the preadv2/pwritev2 calls
stderr contained output for preadv/pwritev calls as well.
The wrappers pertaining to v2.27 and v2.28 trigger a call to preadv/pwritev
which produce the extra output.
Inspecting a bit further we found out that the above was due to the changes for
the preadv2/pwritev2 system call wrappers inside glibc.
The versions which do not differ are 2.26 and 2.29.
Those on the other hand differ from the versions 2.27 and 2.28.
The difference can be easily observed here:
https://elixir.bootlin.com/glibc/glibc-2.27/source/sysdeps/unix/sysv/linux/preadv2.c
(it concerns the if statement which checks the return value of SYSCALL_CANCEL).
I presume this should be handled using either a separate .exp or a suppression
file.
Would the latter be the way to go?
--
You are receiving this mail because:
You are watching all bug changes.
