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

[Jon Christopherson]

On 07/17/2015 04:13 AM, Ramshankar wrote:
> On 07/16/2015 06:15 PM, Ramshankar wrote:
> > Oops, misread your original report. It *is* the WARN panic. I'll try to
> > provide a test build soon to fix this issue.
>
> Please let me know if this build works works for you:
> https://www.virtualbox.org/download/testcase/VirtualBox-5.0.1-101671-Linux_amd64.run
>
>
> Regards,
> Ram.
>
> >> 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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> >> vbox-dev at virtualbox.org
> >> https://www.virtualbox.org/mailman/listinfo/vbox-dev
> >
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> > vbox-dev at virtualbox.org
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>
Hello,

This build works fine on my machine with 4.2.0-rc2 kernel, thanks!

Regards,

Jon