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

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Dear Alan, dear Erich,


Am Dienstag, den 19.01.2016, 11:38 -0500 schrieb Alan Stern:
> On Tue, 19 Jan 2016, Erich Schubert wrote:

> > Attached are photos of the Kernel null pointer BUG that I'm observing.
> > 
> > These shots are with 4.4.0-rc8.
> > As you can see, I have a similar trace to Paul, but the error occurs
> > one stack frame earlier?
>
> Yours is only slighly similar to Paul's.  He got an error in 
> sr_runtime_suspend, but your error occurs in sd_resume -- a completely
> different function in a different source file.

if I remember correctly, it happened it different places for me too. In
the backlog you should see, that Ben gave me a patch to try and then it
wasn’t triggered as it failed somewhere else.

> > Maybe Alex issue is the same bug, but triggered slightly different or
> > just the kernel compiled differently.
> > __rpm_callback, scsi_autopm_put_device, __pm_runtime_resume, sd_probe
> > is present in all of these traces.
> > 
> > Sorry, I do not have a lot of time right now to help testing or debugging.
>
> I can't tell what's going wrong without some real debugging.  This
> means somebody has to build and test a patched kernel.  There are no
> problems on my computer, so it will have to be one or more of you
> guys.

Could you please attach the debugging patch. Hopefully Alexandre, Erich,
or I will have some spare time to build an image from it.

Alan, thank you a lot for being so responsive and helpful!


Thanks,

Paul
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Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Alan Stern <stern@rowland.harvard.edu> - 2016-01-19 17:50 +0100
  Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Paul Menzel <paul.menzel@giantmonkey.de> - 2016-01-19 18:00 +0100
    Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Alan Stern <stern@rowland.harvard.edu> - 2016-01-19 22:10 +0100
      Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Paul Menzel <paul.menzel@giantmonkey.de> - 2016-01-20 00:30 +0100
      Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Alexandre Rossi <alexandre.rossi@gmail.com> - 2016-01-20 23:10 +0100
        Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Paul Menzel <paul.menzel@giantmonkey.de> - 2016-02-09 18:00 +0100
          Bug#801925: NULL pointer dereference: IP: [<f828a00c>] sr_runtime_suspend+0xc/0x20 [sr_mod] Ben Hutchings <ben@decadent.org.uk> - 2016-02-09 22:00 +0100

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