Bug#1146311: ppc64el: fix for random crashes in ld64.so

From	Simon Richter <sjr@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.ports.powerpc, linux.debian.kernel
Subject	Bug#1146311: ppc64el: fix for random crashes in ld64.so
Date	2026-08-31 13:20 +0200
Message-ID	<Ny8dr-em0w-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 3 groups.

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Source: linux
Severity: normal
Tags: patch
X-Debbugs-Cc: debian-powerpc@lists.debian.org, sjr@debian.org
User: debian-powerpc@lists.debian.org
Usertags: powerpc ppc64 ppc64el

Hi,

there are some seemingly random crashes on POWER, pretty much always
inside ld64.so, like

as[136668]: segfault (11) at 2a660 nip 7fff97976704 lr 7fff979758b8 code 1 in ld64.so.2[36704,7fff97940000+50000]
as[136668]: code: 39210058 60000000 60420000 f9490008 f9490010 39290020 f949fff8 f9490000
as[136668]: code: 4200ffec 89210376 3d42ffff 394a7eb0 <e9028000> 7d081050 552906f2 f9410030

With the rather simple patch at
https://lists.ozlabs.org/pipermail/linuxppc-dev/2026-August/301324.html
the problem goes away for me.

Kernels that include commit 263e5159e00a (which was introduced shortly
after 7.2rc5) appear to be affected, and while the crashes are somewhat
seldom, they are still annoyingly disruptive (I just compiled a kernel
with "until make; do :; done" and counted nine iterations) and hit
random processes, including ones that may be vital for the system.

   Simon

-- System Information:
Debian Release: 13.6
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.107+deb13-amd64 (SMP w/20 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#1146311: ppc64el: fix for random crashes in ld64.so Simon Richter <sjr@debian.org> - 2026-08-31 13:20 +0200

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