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| author | Andrew Price <anprice@redhat.com> | 2021-03-15 15:24:00 +0300 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2021-03-15 17:32:42 +0300 |
| commit | 62dd0f98a0e5668424270b47a0c2e973795faba7 (patch) | |
| tree | 7d0c03dd9bc1890eed1fef4987226f6aca6ff0d8 /fs/gfs2 | |
| parent | b77b5fdd052e7ee61b35164abb10e8433d3160e8 (diff) | |
| download | linux-62dd0f98a0e5668424270b47a0c2e973795faba7.tar.xz | |
gfs2: Flag a withdraw if init_threads() fails
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>
Diffstat (limited to 'fs/gfs2')
| -rw-r--r-- | fs/gfs2/super.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 97076d3f562f..9e91c9d92bd6 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -162,8 +162,10 @@ 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)) { |