On 07/17/2015 05:29 AM, Jon Christopherson wrote: > 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, >>>> >>>> >>>> _______________________________________________ >>>> vbox-dev mailing list >>>> vbox-dev@virtualbox.org >>>> https://www.virtualbox.org/mailman/listinfo/vbox-dev >>> >>> _______________________________________________ >>> vbox-dev mailing list >>> vbox-dev@virtualbox.org >>> https://www.virtualbox.org/mailman/listinfo/vbox-dev >> > Hello, > > This build works fine on my machine with 4.2.0-rc2 kernel, thanks!
What got changed in VirtualBox for this test build to work? Could you please provide a patch in advance of the release of 5.0.2? Although I did not have a problem with my original tests of kernel 4.2-rcX, this failure happened to me as soon as commit 2ecd9d29abb1 landed in my source. For the moment, I can run by reverting that kernel commit. I could push a kernel patch requesting this reversion, but as that commit seems to help performance for KVM, that might not be a good idea. Thanks, Larry _______________________________________________ vbox-dev mailing list vbox-dev@virtualbox.org https://www.virtualbox.org/mailman/listinfo/vbox-dev
