Hi, XFS has deadlocked for me while running generic/019 test on umount. The command is hanging in: [ 5429.070390] INFO: task umount:224228 blocked for more than 480 seconds. [ 5429.088153] Tainted: G W 4.9.0-rc3-64-default+ #29 [ 5429.105523] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 5429.126043] umount D ffffffff81618c9d 0 224228 222841 0x00000000 [ 5429.126055] ffff881197089000 0000000000000000 ffff881168dcd2c0 ffff8817da5e0480 [ 5429.126062] ffff8817dd918480 ffffc90033c83d58 ffffffff81618c9d ffffffff810ad30a [ 5429.126073] ffff8817dcdc0000 ffff881700000047 ffff881168dcd2c0 ffff8811a72ff840 [ 5429.126096] Call Trace: [ 5429.126125] [<ffffffff81618c9d>] ? __schedule+0x22d/0x6c0 [ 5429.126144] [<ffffffff810ad30a>] ? try_to_wake_up+0x4a/0x380 [ 5429.126155] [<ffffffff81619166>] schedule+0x36/0x80 [ 5429.126271] [<ffffffffa090e0dc>] xfs_ail_push_all_sync+0xac/0xf0 [xfs] [ 5429.126285] [<ffffffff810c7540>] ? prepare_to_wait_event+0x110/0x110 [ 5429.126386] [<ffffffffa08f45c3>] xfs_unmountfs+0x73/0x1c0 [xfs] [ 5429.126485] [<ffffffffa08f8ea2>] xfs_fs_put_super+0x32/0x90 [xfs] [ 5429.126503] [<ffffffff81214a8f>] generic_shutdown_super+0x6f/0x100 [ 5429.126513] [<ffffffff81214ba7>] kill_block_super+0x27/0x70 [ 5429.126523] [<ffffffff812144a3>] deactivate_locked_super+0x43/0x70 [ 5429.126533] [<ffffffff81214516>] deactivate_super+0x46/0x60 [ 5429.126544] [<ffffffff81231c3f>] cleanup_mnt+0x3f/0x80 [ 5429.126554] [<ffffffff81231cd2>] __cleanup_mnt+0x12/0x20 [ 5429.126565] [<ffffffff8109fe23>] task_work_run+0x83/0xb0 [ 5429.126575] [<ffffffff8107c407>] exit_to_usermode_loop+0x66/0x92 [ 5429.126586] [<ffffffff8100391a>] syscall_return_slowpath+0x9a/0xb0 [ 5429.126602] [<ffffffff8161d904>] entry_SYSCALL_64_fastpath+0xa7/0xa9 In between these stuck messages, there are: [ 5443.405374] XFS (ram1): xfs_log_force: error -5 returned. errors. Full dmesg from the xfstest run is attached. The problem has been triggered on XFS mounted with 'dax' mount option over 20G ramdisks. The kernel is 4.9-rc3 + Ross' DAX PMD patches (latest series) + my ext4 iomap conversion patches. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
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