[Bug ports/27379] New: [2.31] tst-sigcontext-get_pc failing on 32-bit and 64-bit Big-Endian PowerPC

[Bug ports/27379] New: [2.31] tst-sigcontext-get_pc failing on 32-bit and 64-bit Big-Endian PowerPC

[glaubitz at physik dot fu-berlin.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=27379

            Bug ID: 27379
           Summary: [2.31] tst-sigcontext-get_pc failing on 32-bit and
                    64-bit Big-Endian PowerPC
           Product: glibc
           Version: 2.31
               URL: https://buildd.debian.org/status/fetch.php?pkg=glibc&a
                    rch=ppc64&ver=2.31-9&stamp=1612182617&raw=0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ports
          Assignee: unassigned at sourceware dot org
          Reporter: glaubitz at physik dot fu-berlin.de
                CC: adhemerval.zanella at linaro dot org, aurelien at aurel32 dot net,
                    carlos at redhat dot com, jrtc27 at jrtc27 dot com,
                    matorola at gmail dot com, schwab at sourceware dot org
  Target Milestone: ---
              Host: powerpc-*-*

misc/tst-sigcontext-get_pc recently started to fail on 32-bit and 64-bit
PowerPC systems (big-endian).

FAIL: misc/tst-sigcontext-get_pc
original exit status 1
info: address in signal handler: 0x7fffa94c8460
info: call stack entry 0: 0x7fffa96924d0
info: call stack entry 1: 0x7fffa96c04d4
info: call stack entry 2: 0x19
info: call stack entry 3: 0x7fffa969268c
info: call stack entry 4: 0x7fffa9692dbc
info: call stack entry 5: 0x7fffa96937c4
info: call stack entry 6: 0x7fffa96921d8
info: call stack entry 7: 0x7fffa94ac1c4
info: call stack entry 8: 0x7fffa94ac3d4
error: ../sysdeps/unix/sysv/linux/tst-sigcontext-get_pc.c:60: not true: found
error: 1 test failures

Full log in:
https://buildd.debian.org/status/fetch.php?pkg=glibc&arch=ppc64&ver=2.31-9&stamp=1612182617&raw=0

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[Bug ports/27379] [2.31] tst-sigcontext-get_pc failing on 32-bit and 64-bit Big-Endian PowerPC

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27379

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
Kernel bug.

https://lore.kernel.org/linuxppc-dev/20210201200505.iz46ubcizipnkcxe@work-tp/

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[Bug ports/27379] [2.31] tst-sigcontext-get_pc failing on 32-bit and 64-bit Big-Endian PowerPC

[raoni at linux dot ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27379

Raoni Fassina Firmino <raoni at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |raoni at linux dot ibm.com

--- Comment #2 from Raoni Fassina Firmino <raoni at linux dot ibm.com> ---
(In reply to Andreas Schwab from comment #1)
> Kernel bug.
> 
> https://lore.kernel.org/linuxppc-dev/20210201200505.iz46ubcizipnkcxe@work-tp/

As Andreas mentioned, this is a kernel bug, fixed in time for v5.11[0] and
backported to v5.10.16[1], but also there is a workaround that landed on glibc
2.33[3] and was backported to 2.32[4] and 2.31[5].

There is one thing, IIRC, the mentioned kernel bug was exclusive to 64-bit. 


[0]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=24321ac668e452a4942598533d267805f291fdc9
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7f546959b378f97bed2c1894b74f2c4bb84e0530
[2]
https://sourceware.org/git/?p=glibc.git;a=commit;h=5ee506ed35a2c9184bcb1fb5e79b6cceb9bb0dd1
[3]
https://sourceware.org/git/?p=glibc.git;a=commit;h=44b395932961a29825da4ad025124a6760858d9c
[4]
https://sourceware.org/git/?p=glibc.git;a=commit;h=f84949f1c4bbf20e6a1d9a5859cf012cde060ede

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