[vbox-dev] vbox kernel modules cause hardlock on kernel 4.2.0-rc2

Ramshankar ramshankar.venkataraman at oracle.com
Thu Jul 16 16:15:34 GMT 2015

Oops, misread your original report. It *is* the WARN panic. I'll try to 
provide a test build soon to fix this issue.

> I'm not sure how that is happening.
> This changeset
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2ecd9d29abb171d6e97a4f3eb29d7456a11401b7
> reverts to the old assumptions of the caller disabling preemption while
> calling preempt_notifier_register()/preempt_notifier_unregister().
> We would get into the "slower" path but i don't think that should really
> cause the kernel panic like before.
> We would need to call the newly introduced functions
> preempt_notifier_inc() and preempt_notifier_dec() but that should be a
> performance issue and not a fatal panic afaict unless "WARN" ends up
> panicking the system in which case it should be a different panic and
> not the original oops you posted.
> Regards,
> Ram,
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