Re: [syzbot] Re: [syzbot] [squashfs?] possible deadlock in fsnotify_destroy_mark

[syzbot]

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Subject: Re: [syzbot] [squashfs?] possible deadlock in fsnotify_destroy_mark
Author: lizhi.xu@xxxxxxxxxxxxx

Use NOFS to replace

#syz test

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index c7e451d5bd51..3d0dde410b04 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -596,7 +596,7 @@ static int inotify_new_watch(struct fsnotify_group *group,
 	struct idr *idr = &group->inotify_data.idr;
 	spinlock_t *idr_lock = &group->inotify_data.idr_lock;
 
-	tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
+	tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_NOFS);
 	if (unlikely(!tmp_i_mark))
 		return -ENOMEM;