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    SubjectRe: [Linux-cachefs] 3.0.3 64-bit Crash running fscache/cachefilesd
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    On Thu, Oct 13, 2011 at 8:21 AM, David Howells <dhowells@redhat.com> wrote:
    > Mark Moseley <moseleymark@gmail.com> wrote:
    >
    >> So on a cleared cache with SLAB, it took a while but this finally came
    >> up. One interesting thing is that at some point, it logged this:
    >>
    >> [13461.605871] [httpd ] <== __fscache_read_or_alloc_pages() = -ENOBUFS
    >> [invalidating]
    >
    > That's okay.  Basically, a read-from-cache operation was rejected because the
    > cache object was in the early phase of being invalidated.  I kept it simple
    > here - the read might complete next time it is tried, but it's just a cache so
    > that shouldn't matter.

    Ok, noted


    >> It was a while from when it logged that until when I happened to check
    >> on the box again, but when I did (shortly before this traceback),
    >> despite constant NFS activity, nothing in the fscache cache was
    >> getting written out (i.e. the used bytes on the partition stopped
    >> changing), and without any messages about withdrawing the cache or
    >> anythin.
    >
    > Did you look at /proc/fs/fscache/stats at all?

    I didn't but I can repeat it. Which of the stats in
    /proc/fs/fscache/stats would be best to track?


    >> [20839.802118] kernel BUG at fs/fscache/object-list.c:83!
    >> [20839.802733] invalid opcode: 0000 [#1] SMP
    >
    > That fits with the previous BUG elsewhere in object-list.c.  It sounds like
    > there's a refcounting problem somewhere.

    Any sys or proc settings I should turn on to track that?
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