When running xfstests on current Linus' tree I get the following
reproducible hang during test 013:
013 76s ...[ 196.150570] XFS mounting filesystem vdb5
[ 360.596137] INFO: task fsstress:7898 blocked for more than 120
seconds.
[ 360.598053] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.600678] fsstress D 00000006 0 7898 7897 0x00000000
[ 360.602661] f3a1beb0 00000046 f3a1be84 00000006 c1e164a0 00000282
f3a1be8c c0e5f980
[ 360.606072] f3eca340 f5c07540 c0e5f980 c0e5f980 f3eca340 c01805d9
f3a1bee4 00000000
[ 360.609495] f3a1beec f3a1beb8 c0222b38 f3a1bed4 c08fcf35 c0222b30
c1e164a0 c1e164a0
[ 360.612944] Call Trace:
[ 360.613918] [<c01805d9>] ? prepare_to_wait+0x49/0x70
[ 360.615432] [<c0222b38>] bdi_sched_wait+0x8/0x10
[ 360.617019] [<c08fcf35>] __wait_on_bit+0x45/0x70
[ 360.618448] [<c0222b30>] ? bdi_sched_wait+0x0/0x10
[ 360.619934] [<c0222b30>] ? bdi_sched_wait+0x0/0x10
[ 360.621520] [<c08fd003>] out_of_line_wait_on_bit+0xa3/0xb0
[ 360.623169] [<c0180390>] ? wake_bit_function+0x0/0x50
[ 360.624812] [<c0222d1c>] bdi_alloc_queue_work+0xac/0x110
[ 360.626395] [<c0247470>] ? vfs_quota_sync+0x0/0x2b0
[ 360.627961] [<c0222dc7>] bdi_start_writeback+0x47/0x50
[ 360.629632] [<c0222e11>] writeback_inodes_sb_locked+0x41/0x50
[ 360.631319] [<c022721a>] __sync_filesystem+0x4a/0x90
[ 360.632955] [<c022727a>] sync_one_sb+0x1a/0x20
[ 360.634360] [<c020959c>] iterate_supers+0x6c/0xa0
[ 360.635842] [<c0227260>] ? sync_one_sb+0x0/0x20
[ 360.637372] [<c02272a4>] sys_sync+0x24/0x60
[ 360.638751] [<c013075c>] sysenter_do_call+0x12/0x3c
[ 360.640321] 1 lock held by fsstress/7898:
[ 360.641623] #0: (&type->s_umount_key#19){++++..}, at: [<c020958d>]
iterate_supers+0x5d/0xa0
This works fine with the xfs tree which has the same xfs code, but is
otherwise at 2.6.34 level.
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