If nfsd_file_mark_find_or_create() keeps winning the race for the
nfsd_file_fsnotify_group->mark_mutex against nfsd_file_mark_put()
then it can soft lock up, since fsnotify_add_inode_mark() ends
up always finding an existing entry.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfsd/filecache.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 9c2b29e07975..f275c11c4e28 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -132,9 +132,13 @@ nfsd_file_mark_find_or_create(struct nfsd_file *nf)
struct nfsd_file_mark,
nfm_mark));
mutex_unlock(&nfsd_file_fsnotify_group->mark_mutex);
- fsnotify_put_mark(mark);
- if (likely(nfm))
+ if (nfm) {
+ fsnotify_put_mark(mark);
break;
+ }
+ /* Avoid soft lockup race with nfsd_file_mark_put() */
+ fsnotify_destroy_mark(mark, nfsd_file_fsnotify_group);
+ fsnotify_put_mark(mark);
} else
mutex_unlock(&nfsd_file_fsnotify_group->mark_mutex);
--
2.24.1
