Hello,
if I try to do I/O on a mdadm/multipath volume the task is hunging
forever and it never completes.
Anybody else has noticed the same problem?
I'm using 4.5.0-rc5+, from Linus' git. I'll try to do a git bisect
later, I'm pretty sure this problem has been introduced recently (i.e.,
I've never seen this issue with 4.1.x).
Example:
# mdadm -C /dev/md0 --level=multipath --raid-devices=2 /dev/sdb /dev/sdc
# cat /proc/mdstat
Personalities : [multipath]
md0 : active multipath sdb[0] sdc[1]
4042740 blocks super 1.2 [2/2] [UU]
# mkfs.xfs /dev/md0
meta-data=/dev/md0 isize=256 agcount=4, agsize=252672
blks
= sectsz=512 attr=2, projid32bit=0
data = bsize=4096 blocks=1010685, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
^C^C^C
# cat /proc/`pidof mkfs.xfs`/stack
[<ffffffff8126f53c>] do_blockdev_direct_IO+0x1adc/0x2300
[<ffffffff8126fda3>] __blockdev_direct_IO+0x43/0x50
[<ffffffff8126accc>] blkdev_direct_IO+0x4c/0x50
[<ffffffff811a2014>] generic_file_direct_write+0xa4/0x160
[<ffffffff811a2190>] __generic_file_write_iter+0xc0/0x1e0
[<ffffffff8126afc0>] blkdev_write_iter+0x80/0x100
[<ffffffff81228c3d>] __vfs_write+0xad/0xe0
[<ffffffff81229a85>] vfs_write+0xa5/0x1a0
[<ffffffff8122aacc>] SyS_pwrite64+0x6c/0xa0
[<ffffffff818281f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[<ffffffffffffffff>] 0xffffffffffffffff
Thanks,
-Andrea
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