Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+

From	Florian Lehner <dev@der-flo.net>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+
Date	2023-03-24 14:20 +0100
Message-ID	<GcPuN-eLPb-1@gated-at.bofh.it> (permalink)
References	<GcO5H-eK2x-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi,

maybe some additional information.

The eBPF program is of type BPF_PROG_TYPE_PERF_EVENT and attached to all 
CPUs via the perf subsystem and the use of PERF_COUNT_SW_CPU_CLOCK. It 
is executed on a constant sampling frequency (usually 20 Hz).

We also do have qemus guest memory dumps available if this would help 
investigate the issue.

- florian

On Fri, 24 Mar 2023 12:44:33 +0100 =?utf-8?q?Tim_R=C3=BChsen?= 
<tim.ruehsen@gmx.de> wrote:
> Package: linux-image-amd64
> Version: 6.1.20-1
> Severity: important
> X-Debbugs-Cc: tim.ruehsen@gmx.de
> 
> Dear Maintainer,
> 
>    * What led up to the situation?
> 
> We run a priviledged eBPF based tool with a communication between kernel and user space.
> It runs without issues on kernels 4.15 to 5.18.
> On kernels 5.19+, the whole system freezes after a few minutes.
> It seems that with more system activities (load, forks) the freeze happens earlier.
> The underlying hardware seems to play no role, we could reproduce this on different
> bare metal systems as well as within a qemu based VM.
> 
> Since the running program is rather complex, it is not easily possible to carve out a small reproducer.
> We can provide gdb backtraces from freezes inside qemu.
> 
> 
> -- System Information:
> Debian Release: 12.0
>   APT prefers testing-security
>   APT policy: (500, 'testing-security'), (500, 'testing-debug'), (500, 'unstable'), (500, 'testing'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> 
> Kernel: Linux 6.1.0-7-amd64 (SMP w/20 CPU threads; PREEMPT)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=locale: Cannot set LC_ALL to default locale: No such file or directory
> UTF-8), LANGUAGE=en_US:en
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
> 
> Versions of packages linux-image-amd64 depends on:
> ii  linux-image-6.1.0-7-amd64  6.1.20-1
> 
> linux-image-amd64 recommends no packages.
> 
> linux-image-amd64 suggests no packages.
> 
> -- debconf information:
> perl: warning: Setting locale failed.
> perl: warning: Please check that your locale settings:
> 	LANGUAGE = "en_US:en",
> 	LC_ALL = (unset),
> 	LC_TIME = "en_DE.UTF-8",
> 	LC_MONETARY = "en_DE.UTF-8",
> 	LC_COLLATE = "en_DE.UTF-8",
> 	LANG = "en_US.UTF-8"
>     are supported and installed on your system.
> perl: warning: Falling back to a fallback locale ("en_US.UTF-8").
> locale: Cannot set LC_ALL to default locale: No such file or directory

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Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+ Florian Lehner <dev@der-flo.net> - 2023-03-24 14:20 +0100

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