Messages in this thread |  | | Date | Fri, 13 Dec 2013 09:57:48 +0800 | Subject | Re: [HANG 3.13-rc3] blk-mq/virtio: mkfs.ext4 hangs in blk_mq_wait_for_tags | From | Ming Lei <> |
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On Tue, Dec 10, 2013 at 6:39 AM, Dave Chinner <david@fromorbit.com> wrote: > Hi Jens, > > Another day, another blkmq/virtio problem. Running mkfs.ext4 on a > sparse 100TB VM file image, it hangs hard while writing superblock > information: > > $ tests/fsmark-50-test-ext4.sh > mke2fs 1.43-WIP (20-Jun-2013) > Filesystem label= > OS type: Linux > Block size=4096 (log=2) > Fragment size=4096 (log=2) > Stride=0 blocks, Stripe width=0 blocks > 1677721600 inodes, 26843545600 blocks > 1342177280 blocks (5.00%) reserved for the super user > First data block=0 > 819200 block groups > 32768 blocks per group, 32768 fragments per group > 2048 inodes per group > Superblock backups stored on blocks: > 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, > 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, > 102400000, 214990848, 512000000, 550731776, 644972544, 1934917632, > 2560000000, 3855122432, 5804752896, 12800000000, 17414258688 > > Allocating group tables: done > Writing inode tables: done > Creating journal (32768 blocks): done > Writing superblocks and filesystem accounting information: > > It writes a few superblocks, then hangs. Immediately after it stops > updating that last line, I see this: > > root@test4:~# echo w > /proc/sysrq-trigger
It might be helpful to do below and post the result before the sysrq-trigger:
cat /sys/class/block/vda/mq/0/tags
Thanks, -- Ming Lei
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