Messages in this thread | | | Subject | Re: [4.14-rc1 x86] WARNING: kernel stack regs at f60bbb12 in swapper:1 has bad 'bp' value 0ba00000 | From | Tetsuo Handa <> | Date | Wed, 4 Oct 2017 00:21:33 +0900 |
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Josh Poimboeuf wrote: > On Tue, Oct 03, 2017 at 09:35:18AM -0500, Josh Poimboeuf wrote: > > On Tue, Oct 03, 2017 at 10:44:13PM +0900, Tetsuo Handa wrote: > > > Josh Poimboeuf wrote: > > > > > > > On Tue, Oct 03, 2017 at 12:37:44PM +0200, Borislav Petkov wrote: > > > > > On Tue, Oct 03, 2017 at 07:29:36PM +0900, Tetsuo Handa wrote: > > > > > > Tetsuo Handa wrote: > > > > > > > Tetsuo Handa wrote: > > > > > > > > Tetsuo Handa wrote: > > > > > > > > > I'm seeing below error between > > > > > > > > > 4898b99c261efe32 ("Merge tag 'acpi-4.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm") (git bisect good (presumably)) > > > > > > > > > e6f3faa734a00c60 ("locking/lockdep: Fix workqueue crossrelease annotation") (git bisect bad) on linux.git . > > > > > > > > > > > > > > > > F.Y.I. This error remains as of 46c1e79fee417f15 ("Merge branch 'perf-urgent-for-linus' of > > > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip") on linux.git . > > > > > > > > > > > > > > > > > > > > > > This error still remains as of 6e80ecdddf4ea6f3 ("Merge branch 'libnvdimm-fixes' > > > > > > > of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm") on linux.git . > > > > > > > > > > > > > > I'm suspecting that this error is causing very unstable x86_32 kernel. > > > > > > > It seems that this error occurs (though rare frequency) even on x86_64 kernel. > > > > > > > > > > > > > > Nobody cares? > > > > > > > > > > > > > 4.14-rc3 still trivially panics due to this error. Is this problem known? > > > > > > > > Can you try with the following patch? It should hopefully give more > > > > useful information in the dump. > > > > > > > I see. Here is the result. > > > > Hm, that's not what I expected to happen... I suspect this is stack > > corruption, with the result being slightly different every time. Can > > you see if this patch fixes the panic? > > On second thought, I don't think that's the right fix. But I do think > what you're seeing is related to a lockdep issue: > > https://lkml.kernel.org/r/20171003140634.r2jzujgl62ox4uzh@wfg-t540p.sh.intel.com
Oh, very likely. That commit is in "git log 4898b99c261efe32...e6f3faa734a00c60" range.
> > I'm not sure yet why it's breaking the unwinder so badly though. > > -- > Josh >
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