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From: "glaubitz at physik dot fu-berlin.de"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29537] New: [2.34 regression]: Alignment issue on m68k
 when using futexes on qemu-user
Date: Tue, 30 Aug 2022 07:30:24 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.34
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29537

            Bug ID: 29537
           Summary: [2.34 regression]: Alignment issue on m68k when using
                    futexes on qemu-user
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: glaubitz at physik dot fu-berlin.de
                CC: adhemerval.zanella at linaro dot org, drepper.fsp at gm=
ail dot com,
                    rth at sourceware dot org, schwab@linux-m68k.org
  Target Milestone: ---
              Host: m68k-*-*

There is a recent regression when using running a Linux/m68k userland on
qemu-user with applications crashing with futex errors:

   dh_md5sums -a -O--builddirectory=3Dbuild -O--dbgsym-migration=3Daptitude=
-dbg
   dh_builddeb -a -O--builddirectory=3Dbuild -O--dbgsym-migration=3Daptitud=
e-dbg
dpkg-deb: building package 'aptitude-dbgsym' in
'../aptitude-dbgsym_0.8.13-4_m68k.deb'.
dpkg-deb: building package 'aptitude' in '../aptitude_0.8.13-4_m68k.deb'.
The futex facility returned an unexpected error code.
qemu: uncaught target signal 6 (Aborted) - core dumped
dpkg-deb: error: <compress> from tar -cf subprocess was killed by signal
(Aborted)
dh_builddeb: error: dpkg-deb --root-owner-group --build
debian/.debhelper/aptitude/dbgsym-root .. returned exit code 2
dh_builddeb: error: Aborting due to earlier error
make: *** [debian/rules:22: binary-arch] Error 2

The error was reported to QEMU upstream [1] but eventually turned out to be=
 a
glibc problem [2]. According to the comment by Richard Henderson, glibc must
enforce the alignment of __libc_lock_t to be 32 bits.

> [1] https://gitlab.com/qemu-project/qemu/-/issues/957
> [2] https://gitlab.com/qemu-project/qemu/-/issues/957#note_1081526226

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