On Wed, 28 Nov 2012 14:51:59 +0000 Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxx> wrote: > On Tuesday 27 November 2012 12:05:28 NeilBrown wrote: > > On Sat, 24 Nov 2012 10:18:44 +0100 Torsten Kaiser > > > > <just.for.lkml@xxxxxxxxxxxxxx> wrote: > > > After my system got stuck with 3.7.0-rc2 as reported in > > > http://marc.info/?l=linux-kernel&m=135142236520624 LOCKDEP seem to > > > blame XFS, because it found 2 possible deadlocks. But after these > > > locking issues where fixed, my system got stuck again with 3.7.0-rc6 > > > as reported in http://marc.info/?l=linux-kernel&m=135344072325490 > > > Dave Chinner thinks its an issue within md, that it gets stuck and > > > that will then prevent any further xfs activity, and that I should > > > report it to the raid mailing list. > > > > > > The issue seems to be that multiple processes (kswapd0, xfsaild/md4 > > > and flush-9:4) get stuck in md_super_wait() like this: > > > [<ffffffff816b1224>] schedule+0x24/0x60 > > > [<ffffffff814f9dad>] md_super_wait+0x4d/0x80 > > > [<ffffffff8105ca30>] ? __init_waitqueue_head+0x60/0x60 > > > [<ffffffff81500753>] bitmap_unplug+0x173/0x180 > > > [<ffffffff810b6acf>] ? write_cache_pages+0x12f/0x420 > > > [<ffffffff810b6700>] ? set_page_dirty_lock+0x60/0x60 > > > [<ffffffff814e8eb8>] raid1_unplug+0x98/0x110 > > > [<ffffffff81278a6d>] blk_flush_plug_list+0xad/0x240 > > > [<ffffffff81278c13>] blk_finish_plug+0x13/0x50 > > > > > > The full hung-tasks stack traces and the output from SysRq+W can be > > > found at http://marc.info/?l=linux-kernel&m=135344072325490 or in the > > > LKML thread 'Hang in XFS reclaim on 3.7.0-rc3'. > > > > Yes, it does look like an md bug.... > > Can you test to see if this fixes it? > > Hi, > > Would this bug be present in 3.6 as well? Because I am hitting something which > looks pretty much like this with 3.6.x. In which case it should go to -stable, > however I am not able to test on the affected machine at the moment. > > Regards, > > Tvrtko Yes it is in 3.6, and it will go to -stable. Thanks, NeilBrown
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