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From: "glaubitz at physik dot fu-berlin.de"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29899] New: Fix for bz#20305 broke glibc on
 alpha-linux-gnu
Date: Tue, 13 Dec 2022 17:43:17 +0000
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X-Bugzilla-Version: 2.34
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29899

            Bug ID: 29899
           Summary: Fix for bz#20305 broke glibc on alpha-linux-gnu
           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,
                    hjl.tools at gmail dot com, jrtc27 at jrtc27 dot com,
                    mcree at orcon dot net.nz
  Target Milestone: ---
              Host: alpha-linux-gnu

The following commit broke glibc on alpha-linux-gnu, in this case Debian
unstable running on Alpha:

commit 6c57d320484988e87e446e2e60ce42816bf51d53
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Feb 1 11:00:38 2021 -0800

    sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305]

    Add _SC_MINSIGSTKSZ for the minimum signal stack size derived from
    AT_MINSIGSTKSZ, which is the minimum number of bytes of free stack
    space required in order to gurantee successful, non-nested handling
    of a single signal whose handler is an empty function, and _SC_SIGSTKSZ
    which is the suggested minimum number of bytes of stack space required
    for a signal stack.

Without the patch applied, running bash in a qemu-user-static chroot from t=
he
build directory of a cross-compiled build works fine:

(sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$
LD_LIBRARY_PATH=3D/home/glaubitz/glibc-git/build /bin/bash
(sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$=20
exit

With the patch applied, the above command results in a segmentation fault:

(sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$
LD_LIBRARY_PATH=3D/home/glaubitz/glibc-git/build /bin/bash
Segmentation fault
(sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$

The issue also becomes apparent when comparing the testsuite failures for
glibc-2.33 and glibc-2.34 in Debian unstable:

> https://buildd.debian.org/status/fetch.php?pkg=3Dglibc&arch=3Dalpha&ver=
=3D2.33-8&stamp=3D1657736413&raw=3D0
> https://buildd.debian.org/status/fetch.php?pkg=3Dglibc&arch=3Dalpha&ver=
=3D2.34-1&stamp=3D1659947712&raw=3D0

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