Re: perf bug: bad page map

From: Vince Weaver
Date: Mon Nov 18 2013 - 20:49:03 EST


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...

Vince
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/