hung in raise_barrier() in raid1.c -- any ideas?

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Hi,

I've got a fairly beefy (32 cpus, 64GB ram, isci-based SAS disks, etc.) embedded system running 2.6.27.

We're seeing issues where disk operations suddenly seem to stall. In the most recent case we had the hung-task watchdog indicate that md1_resync was stuck for more than 120sec in raise_barrier().

There are a bunch of "normal" tasks also stuck in wait_barrier(), so based on that I assume we're stuck in the second call to wait_event_lock_irq().

Has anyone seen anything like this? Could commit 73d5c38 be related? What about 1d9d524?

Also, what's the meaning of RESYNC_DEPTH?

Thanks,
Chris

--

Chris Friesen
Software Designer

3500 Carling Avenue
Ottawa, Ontario K2H 8E9
www.genband.com
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