gfs2: Flag a withdraw if init_threads() fails

BugLink: https://bugs.launchpad.net/bugs/1926993
[ Upstream commit 62dd0f98a0e5668424270b47a0c2e973795faba7 ]

Interrupting mount with ^C quickly enough can cause the kthread_run()
calls in gfs2's init_threads() to fail and the error path leads to a
deadlock on the s_umount rwsem. The abridged chain of events is:

  [mount path]
  get_tree_bdev()
    sget_fc()
      alloc_super()
        down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING); [acquired]
    gfs2_fill_super()
      gfs2_make_fs_rw()
        init_threads()
          kthread_run()
            ( Interrupted )
      [Error path]
      gfs2_gl_hash_clear()
        flush_workqueue(glock_workqueue)
          wait_for_completion()

  [workqueue context]
  glock_work_func()
    run_queue()
      do_xmote()
        freeze_go_sync()
          freeze_super()
            down_write(&sb->s_umount) [deadlock]

In freeze_go_sync() there is a gfs2_withdrawn() check that we can use to
make sure freeze_super() is not called in the error path, so add a
gfs2_withdraw_delayed() call when init_threads() fails.

Ref: https://bugzilla.kernel.org/show_bug.cgi?id=212231

Reported-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 754ea2a137b4fc598abb769283254b4fdff4aaf8..34ca312457a6987e4b62f1b609774ba1882de61a 100644 (file)
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -169,8 +169,10 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
        int error;
 
        error = init_threads(sdp);
-       if (error)
+       if (error) {
+               gfs2_withdraw_delayed(sdp);
                return error;
+       }
 
        j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
        if (gfs2_withdrawn(sdp)) {