linux-kernel - Re: few dozen pollfress.t segfaults messages in system log

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Message-ID: <0072e883-1c09-4a8d-86f8-a3de26b18b1e@t-8ch.de>
Date:   Wed, 9 Aug 2023 23:07:10 +0200
From:   Thomas Weißschuh <thomas@...ch.de>
To:     Toralf Förster <toralf.foerster@....de>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: few dozen pollfress.t segfaults messages in system log

On 2023-08-09 21:45:57+0200, Toralf Förster wrote:
> I got a bunch of
> 
> $ grep pollfree messages
> Aug  9 02:10:14 mr-fox kernel: pollfree.t[18582]: segfault at 10b ip
> 0000563c9619b373 sp 00007f69511a2eb0 error 4 in
> pollfree.t[563c9619a000+3000] likely on CPU 14 (core 14, socket 0)
> Aug  9 02:10:14 mr-fox kernel: pollfree.t[18594]: segfault at 10b ip
> 0000563c9619b373 sp 00007f69511a2eb0 error 4 in
> pollfree.t[563c9619a000+3000] likely on CPU 4 (core 4, socket 0)
> Aug  9 02:10:14 mr-fox kernel: pollfree.t[18597]: segfault at 10b ip
> 0000563c9619b373 sp 00007f69511a2eb0 error 4 in
> pollfree.t[563c9619a000+3000] likely on CPU 11 (core 11, socket 0)
> Aug  9 02:10:14 mr-fox kernel: pollfree.t[18601]: segfault at 10b ip
> 0000563c9619b373 sp 00007f69511a2eb0 error 4 in
> pollfree.t[563c9619a000+3000] likely on CPU 26 (core 10, socket 0)
> 
> last night with kernel 6.4.9 at a stable hardened Gentoo Linux:
> 
> Linux p14s 6.1.44 #34 SMP Tue Aug  8 21:43:00 CEST 2023 x86_64 AMD Ryzen
> 7 PRO 6850U with Radeon Graphics AuthenticAMD GNU/Linux
> 
> I do wonder if those messages are related to the host kernel or if they
> are coming from a buggy app within one of the images of the build bot I
> do run at that machine ?

Probably from the "pollfree" test of liburing [0].

Thomas

[0] https://github.com/axboe/liburing/blob/master/test/pollfree.c