From: Aaron Marcher <aaron@sigma-star.at>
To: linux-rt-users@vger.kernel.org
Subject: Debugging reboot freeze
Date: Fri, 25 Sep 2020 12:04:50 +0200 [thread overview]
Message-ID: <20200925100450.3t3xrwwb22fac7ti@linux-8csb> (raw)
Hi,
we are encountering reboot freezes on the current 5.4.66-rt38 kernel
with PREEMPT_RT enabled on i.mx8mm hardware.
Unfortunately, debugging is difficult in this situation as the only
related output we get during reboot (via serial console) is:
Rebooting...
Segmentation fault
However, the second line is not shown on every reboot; the freeze
happens everytime.
We already tried various kernel command line options
(print-fatal-signals=1 oops=panic), earlyprintk/earlycon and a lot of
debug printk's in the kernel source.
However it seems that there is no output after
`kernel_restart_prepare(cmd);` in kernel/reboot.c.
When using the same kernel version without PREEMPT_RT, the issue does
not occur.
Do you have any hints for further debugging?
Thank you very much in advance.
Regards,
Aaron Marcher
next reply other threads:[~2020-09-25 10:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 10:04 Aaron Marcher [this message]
2020-09-27 0:59 ` Debugging reboot freeze Peng Fan
2020-09-28 7:39 ` Aaron Marcher
2020-09-28 10:07 ` Peng Fan
2020-09-28 11:21 ` Aaron Marcher
-- strict thread matches above, loose matches on Subject: below --
2020-09-25 9:57 Aaron Marcher
2020-09-25 15:16 ` Sebastian Andrzej Siewior
2020-10-05 19:40 ` Richard Weinberger
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