Messages in this thread | | | Date | Wed, 17 Feb 2010 21:51:58 -0500 | From | Michael Breuer <> | Subject | Re: Hung task - sync - 2.6.33-rc7 w/md6 multicore rebuild in process |
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On 2/17/2010 9:39 PM, Jan Kara wrote: >> On 2/13/2010 11:51 AM, Michael Breuer wrote: >> >> Note: this cleared after about 90 minutes - sync eventually completed. >> I'm thinking that with multicore enabled the resync is able to starve >> out normal system activities that weren't starved w/o multicore. >> > Hmm, it is a bug in writeback code. But as Linus pointed out, it's not really > clear why it's *so* slow. So when it happens again, could you please sample for > a while (like every second for 30 seconds) stacks of blocked tasks via > Alt-Sysrq-W? I'd like to see where flusher threads are hanging... Thanks. > > Honza > Ok - will do. On rc8 now - and up about 3 days without any issues. If I have some time tomorrow I'll force a raid resync and see what happens.
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