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| author | Tim Smith <tim.smith@citrix.com> | 2018-10-08 12:15:40 -0500 |
|---|---|---|
| committer | Bob Peterson <rpeterso@redhat.com> | 2018-10-09 07:05:36 -0500 |
| commit | 1eb8d7387908022951792a46fa040ad3942b3b08 (patch) | |
| tree | 1ece4fba04f1c8ce3b013727dfb804ca5c022d54 | |
| parent | 4c62bd9cea7bcf10292f7e4c57a2bca332942697 (diff) | |
| download | blackbird-op-linux-1eb8d7387908022951792a46fa040ad3942b3b08.tar.gz blackbird-op-linux-1eb8d7387908022951792a46fa040ad3942b3b08.zip | |
GFS2: Flush the GFS2 delete workqueue before stopping the kernel threads
Flushing the workqueue can cause operations to happen which might
call gfs2_log_reserve(), or get stuck waiting for locks taken by such
operations. gfs2_log_reserve() can io_schedule(). If this happens, it
will never wake because the only thing which can wake it is gfs2_logd()
which was already stopped.
This causes umount of a gfs2 filesystem to wedge permanently if, for
example, the umount immediately follows a large delete operation.
When this occured, the following stack trace was obtained from the
umount command
[<ffffffff81087968>] flush_workqueue+0x1c8/0x520
[<ffffffffa0666e29>] gfs2_make_fs_ro+0x69/0x160 [gfs2]
[<ffffffffa0667279>] gfs2_put_super+0xa9/0x1c0 [gfs2]
[<ffffffff811b7edf>] generic_shutdown_super+0x6f/0x100
[<ffffffff811b7ff7>] kill_block_super+0x27/0x70
[<ffffffffa0656a71>] gfs2_kill_sb+0x71/0x80 [gfs2]
[<ffffffff811b792b>] deactivate_locked_super+0x3b/0x70
[<ffffffff811b79b9>] deactivate_super+0x59/0x60
[<ffffffff811d2998>] cleanup_mnt+0x58/0x80
[<ffffffff811d2a12>] __cleanup_mnt+0x12/0x20
[<ffffffff8108c87d>] task_work_run+0x7d/0xa0
[<ffffffff8106d7d9>] exit_to_usermode_loop+0x73/0x98
[<ffffffff81003961>] syscall_return_slowpath+0x41/0x50
[<ffffffff815a594c>] int_ret_from_sys_call+0x25/0x8f
[<ffffffffffffffff>] 0xffffffffffffffff
Signed-off-by: Tim Smith <tim.smith@citrix.com>
Signed-off-by: Mark Syms <mark.syms@citrix.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
| -rw-r--r-- | fs/gfs2/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index c212893534ed..a971862b186e 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -854,10 +854,10 @@ static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) return error; + flush_workqueue(gfs2_delete_workqueue); kthread_stop(sdp->sd_quotad_process); kthread_stop(sdp->sd_logd_process); - flush_workqueue(gfs2_delete_workqueue); gfs2_quota_sync(sdp->sd_vfs, 0); gfs2_statfs_sync(sdp->sd_vfs, 0); |
