[OpenAFS] linux kernel error: afs_get_hash_stats

[Ben Poliakoff]

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A debian linux web server that I maintain has started to log many
thousands of the following error every day:

    afs_get_hash_stats: Warning! exceeded max bucket len 36

=2E..approaching 100,000/day actually.

In the last couple of days I started seeing a more interesting kernel
error on this box.  I'm uncertain whether the issue is hardware or
software related, but the openafs module is featured prominently in the
"Call Trace":

    afs_get_hash_stats: Warning! exceeded max bucket len 39
    afs_get_hash_stats: Warning! exceeded max bucket len 41
    BUG: soft lockup detected on CPU#1!

    Call Trace:
     <IRQ> [<ffffffff802a3673>] softlockup_tick+0xdb/0xed
     [<ffffffff802878d5>] update_process_times+0x42/0x68
     [<ffffffff8026c2b5>] smp_local_timer_interrupt+0x23/0x47
     [<ffffffff8026c9a9>] smp_apic_timer_interrupt+0x41/0x47
     [<ffffffff8025874a>] apic_timer_interrupt+0x66/0x6c
     <EOI> [<ffffffff802811f3>] vprintk+0x29e/0x2ea
     [<ffffffff88269ec0>] :openafs:hash_bucket_stat+0x0/0x60

See http://pastebin.com/m397eccb for the full call trace (including
several more .

kernel is 2.6.18-6-amd64
openafs client version is 1.4.2-6etch1 (it's a debian box)

Does this ring any bells for anyone?

Ben

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