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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/31798] New: pidfd_getpid.c is miscompiled by GCC 6.4
Date: Sat, 25 May 2024 11:03:53 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.40
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31798

            Bug ID: 31798
           Summary: pidfd_getpid.c is miscompiled by GCC 6.4
           Product: glibc
           Version: 2.40
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
            Target: i686

On i686, pidfd_getpid.c in glibc 2.40 master branch is miscompiled by GCC 6=
.4:

FAIL: misc/tst-pidfd
FAIL: misc/tst-pidfd_getpid

../sysdeps/unix/sysv/linux/tst-pidfd.c:128: numeric comparison failure
   left: 3063298 (0x2ebe02); from: pidfork
  right: -1 (0xffffffff); from: pid
../sysdeps/unix/sysv/linux/tst-pidfd.c:141: numeric comparison failure
   left: 9 (0x9); from: errno
  right: 3 (0x3); from: ESRCH
../sysdeps/unix/sysv/linux/tst-pidfd.c:165: numeric comparison failure
   left: -1 (0xffffffff); from: querypid
  right: 3063299 (0x2ebe03); from: pid
error: 3 test failures

GCC 7.4 is OK.

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