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[Xen-devel] RE: kernel BUG at arch/x86/xen/mmu.c:1872

     I believe this is the fix at much extent.
     Since I have my own test cases which with this patch, my test case will success in 30 rounds run.
     Every round takes 8hours.  While without this patch, tests fail evey round in 15minutes.
      So this really means fix most of the things. 
      But during running, I met another crash, from the log it it looks like has relation with
this BUG, since the crash log shows it is tlb related and this BUG also tlb related.
      Well, I'm also have poor knowledge of kernel.
      Hope someone from Xen Devel offer some help.
      Many thanks.
> Date: Mon, 11 Apr 2011 20:16:53 +0800
> Subject: Re: kernel BUG at arch/x86/xen/mmu.c:1872
> From: giamteckchoon@xxxxxxxxx
> To: tinnycloud@xxxxxxxxxxx
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx; dave@xxxxxxxxxx; ian.campbell@xxxxxxxxxx; konrad.wilk@xxxxxxxxxx; jeremy@xxxxxxxx; keir@xxxxxxx
> >
> > Hi,
> >
> > Sorry, since this mmu related BUG has been troubled me for very
> > long... I really want to "kill" this BUG but my knowledge in kernel
> > hacking and/or xen is very limited.
> >
> > While waiting for Jeremy or Konrad or others ...
> >
> > Many thanks for spending time to track down this mmu related BUG.  I
> > have backported the commit from
> > http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commit;h=64141da587241301ce8638cc945f8b67853156ec
> > to PVOPS kernel and patch attached.  I won't kn ow whether
> > did I backport it correctly nor does it affects anything.  I am
> > currently testing the PVOPS kernel with this patch applied
> > and also unset CONFIG_DEBUG_PAGEALLOC.  Currently running testcrash.sh
> > loop 1000 as I am unable to reproduce this mmu BUG 1872 in
> > testcrash.sh loop 100.  Please note that when CONFIG_DEBUG_PAGEALLOC
> > is unset, I can reproduce this mmu BUG 1872 easily within <50
> > testcrash.sh loop cycle with PVOPS version to
> > kernel.  Now test with this backport patch to see whether I can
> > reproduce this mmu BUG... ...
> >
> > Kindest regards,
> > Giam Teck Choon
> >
> I have tested with my backport patch and it is working fine as I am
> unable to reproduce the mmu.c 1872 or 1860 bug with
> CONFIG_DEBUG_PAGEALLOC not set. I tested with t estcrash.sh loop 100
> and 1000. Now doing testcrash.sh loop 10000.
> Xiaoyun, is it possible for you to test my patch and see whether can
> you reproduce the mmu.c 1872/1860 bug?
> Can anyone of you review my patch?
> I will post a format patch according to
> Documentation/SubmittingPatches in my next reply and hopefully can be
> reviewed.
> Thanks.
> Kindest regards,
> Giam Teck Choon

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