Messages in this thread | | | Date | Tue, 19 Nov 2013 13:15:31 -0700 | From | Jens Axboe <> | Subject | Re: [Regression x2, 3.13-git] virtio block mq hang, iostat busted on virtio devices |
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On Tue, Nov 19 2013, Dave Chinner wrote: > Hi Jens, > > I was just running xfstests on a 3.13 kernel that has had the block > layer changed merged into it. generic/269 on XFS is hanging on a 2 > CPU VM using virtio,cache=none for the block devices under test, > with many (130+) threads stuck below submit_bio() like this: > > Call Trace: > [<ffffffff81adb1c9>] schedule+0x29/0x70 > [<ffffffff817833ee>] percpu_ida_alloc+0x16e/0x330 > [<ffffffff81759bef>] blk_mq_wait_for_tags+0x1f/0x40 > [<ffffffff81758bee>] blk_mq_alloc_request_pinned+0x4e/0xf0 > [<ffffffff8175931b>] blk_mq_make_request+0x3bb/0x4a0 > [<ffffffff8174d2b2>] generic_make_request+0xc2/0x110 > [<ffffffff8174e40c>] submit_bio+0x6c/0x120 > > reads and writes are hung, both data (direct and buffered) and > metadata. > > Some IOs are sitting in io_schedule, waiting for IO completion (both > buffered and direct IO, both reads and writes) so it looks like IO > completion has stalled in some manner, too.
Can I get a recipe to reproduce this? I haven't had any luck so far.
-- Jens Axboe
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