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Groups > linux.debian.kernel > #52256

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

Cross-posted to 2 groups.

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On Tue, 19 Jan 2016, Erich Schubert wrote:

> Hi,
> 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.

> 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.

Alan Stern

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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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