Re: perf bug: bad page map
From: Ingo Molnar
Date: Tue Nov 19 2013 - 02:06:51 EST
* Vince Weaver <vincent.weaver@xxxxxxxxx> wrote:
> On Mon, 18 Nov 2013, One Thousand Gnomes wrote:
>
> > On Mon, 18 Nov 2013 11:41:22 -0500 (EST)
> > Vince Weaver <vincent.weaver@xxxxxxxxx> wrote:
> >
> > > On Mon, 18 Nov 2013, Peter Zijlstra wrote:
> > >
> > > > On Fri, Nov 15, 2013 at 01:04:23PM -0500, Vince Weaver wrote:
> > > > >
> > > > > (figured out the minicom issue).
> > > > >
> > > > > Anyway while trying to reproduce the last bug I instead got this with
> > > > > the perf_fuzzer.
> > > > >
> > > > > Is it worth continuing to run and report these issues? I'm losing track
> > > > > of all the open bugs.
> > > >
> > > > This is looks like ext4. Not entirely sure how perf ties into this.
> > >
> > > It's believable the filesystem could have issues (it's a fuzzer machine,
> > > so it's had 100+ unclean shutdowns on an SSD drive in the past few months)
> > > but as far as I know there shouldn't have been any filesystem accesses
> > > happening at all when the bug triggered.
> >
> > Obvious question - does it pass fsck currently. If it does then
> > presumably it was sane at the time it went pop ?
>
> # e2fsck -f /dev/sda1
> e2fsck 1.42.8 (20-Jun-2013)
> Pass 1: Checking inodes, blocks, and sizes
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> /dev/sda1: 620972/3514368 files (0.5% non-contiguous), 9796212/14047744 blocks
>
> so it looks clean now...
Also, in no way should a corrupted filesystem be able to provoke
kernel crashes. So even if the filesystem had errors, this would still
be a kernel bug we need to fix.
Thanks,
Ingo
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