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Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod]



Dear Debian and Linux folks,


Am Mittwoch, den 20.01.2016, 23:07 +0100 schrieb Alexandre Rossi:

> >> Could you please attach the debugging patch. Hopefully Alexandre, Erich,
> >> or I will have some spare time to build an image from it.
> >
> > Actually, this patch is an attempt at a fix.  After looking more
> > carefully at your log pictures, I realized what the problem must be.
> >
> > It's too bad nobody was able to capture a log where the error
> > occurred in sr_runtime_suspend, though -- all the logs in the bug
> > report show sd_runtime_resume.
> 
> I just tested the patch applied on top of 4.3.3 (4.3.3-6 in Debian).
> 
> It still crashes at boot, but the stacktrace is different : it happens
> in blk_post_runtime_resume . Maybe I'm bit by a different bug or maybe
> the I need to try with 4.4.
> 
> I'll post the captured log when I have access to a wired network. I'd
> be happy to provide the logs of a debugging patch.

I tried Linux 4.3.5-1 [1], which entered Debian Sid/unstable yesterday,
and I get the same null pointer dereference as Alexandre.

As this is Linux 4.3 and not 4.4, I guess this is a different problem
though. Alexandre, where you able to capture the stack trace? I’d submit
a new bug report with this.


Thanks,

Paul


[1] http://metadata.ftp-master.debian.org/changelogs/main/l/linux/linux_4.3.5-1_changelog
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