From: Joseph Salisbury <joseph.salisbury@canonical.com>
To: linux-rt-users@vger.kernel.org
Cc: williams@redhat.com, bigeasy@linutronix.de
Subject: Re: System Hang With 5.15.79-rt54 Patch Set
Date: Thu, 15 Dec 2022 18:39:45 -0500 [thread overview]
Message-ID: <be47fd9c-028a-0b6b-9c7f-877f01e73960@canonical.com> (raw)
In-Reply-To: <fe5974c9-3ed0-938a-f43c-4d301f603e92@canonical.com>
On 12/15/22 13:39, Joseph Salisbury wrote:
> Hello,
>
> A bug has been reported[0] against a linux-5.15.y based Ubuntu kernel
> that has the 5.15.79-rt54 real-time patch set applied.
>
> This bug is causing a system hang when running disk tests with the
> stress-ng[1] test suite. A 'hung task' call trace is being
> generated[2] just prior to the system hanging. It appears the hang is
> happening during a call to schedule.
>
> To see if this was a regression, I also tested prior real-time patch
> sets, going as far back to rt38 and all versions exhibit this bug. I
> will test back further to see if this is in fact a regression and a
> kernel bisect can be done. I also confirmed the same kernel without
> the rt54 patch set applied does not exhibit this bug.
>
> I will continue to debug this issue, but I wanted to send this message
> upstream in case anyone else runs into it. Any specific tests,
> tracing or debugging steps would be greatly appreciated. Otherwise,
> I'll report back to this thread with any findings.
>
> Thanks,
>
> Joe
>
>
> [0] https://bugs.launchpad.net/ubuntu-realtime/+bug/1998536
> [1] https://github.com/ColinIanKing/stress-ng
> [2] https://launchpadlibrarian.net/637058129/dmesg_dl110_rt_kernel.txt
I should have also mentioned, I will also test the latest available
patch set (6.1-rc7-rt5) to see if it also exhibits the bug.
next prev parent reply other threads:[~2022-12-15 23:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-15 18:39 System Hang With 5.15.79-rt54 Patch Set Joseph Salisbury
2022-12-15 23:39 ` Joseph Salisbury [this message]
2023-01-04 20:47 ` Joseph Salisbury
2023-01-18 18:52 ` Joseph Salisbury
2023-02-16 17:15 ` Sebastian Andrzej Siewior
2023-03-10 21:09 ` Joseph Salisbury
2023-03-13 15:11 ` Alison Chaiken
2023-02-28 16:50 ` Joseph Salisbury
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