WARNING: possible circular locking dependency detected
6.3.0-rc7-syzkaller-00181-g8e41e0a57566 #0 Not tainted
------------------------------------------------------
kswapd0/109 is trying to acquire lock:
ffff888029196930 (&group->mark_mutex){+.+.}-{3:3}, at: fsnotify_group_lock include/linux/fsnotify_backend.h:266 [inline]
ffff888029196930 (&group->mark_mutex){+.+.}-{3:3}, at: fsnotify_destroy_mark fs/notify/mark.c:496 [inline]
ffff888029196930 (&group->mark_mutex){+.+.}-{3:3}, at: fsnotify_destroy_marks+0x16a/0x4b0 fs/notify/mark.c:854
but task is already holding lock:
ffffffff8c8e11c0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:200 [inline]
ffffffff8c8e11c0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7338
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4717 [inline]
fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4731
might_alloc include/linux/sched/mm.h:271 [inline]
slab_pre_alloc_hook mm/slab.h:728 [inline]
slab_alloc_node mm/slab.c:3241 [inline]
slab_alloc mm/slab.c:3266 [inline]
__kmem_cache_alloc_lru mm/slab.c:3443 [inline]
kmem_cache_alloc+0x3d/0x3f0 mm/slab.c:3452
inotify_new_watch fs/notify/inotify/inotify_user.c:600 [inline]
inotify_update_watch+0x530/0xc30 fs/notify/inotify/inotify_user.c:648
__do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:787 [inline]
__se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:730 [inline]
__x64_sys_inotify_add_watch+0x2bf/0x350 fs/notify/inotify/inotify_user.c:730
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&group->mark_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
fsnotify_group_lock include/linux/fsnotify_backend.h:266 [inline]
fsnotify_destroy_mark fs/notify/mark.c:496 [inline]
fsnotify_destroy_marks+0x16a/0x4b0 fs/notify/mark.c:854
fsnotify_inoderemove include/linux/fsnotify.h:193 [inline]
dentry_unlink_inode+0x3aa/0x460 fs/dcache.c:397
__dentry_kill+0x3c0/0x640 fs/dcache.c:607
shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x33a/0x590 fs/super.c:104
do_shrink_slab+0x428/0xaa0 mm/vmscan.c:853
shrink_slab_memcg mm/vmscan.c:922 [inline]
shrink_slab+0x388/0x660 mm/vmscan.c:1001
shrink_one+0x502/0x810 mm/vmscan.c:5343
shrink_many mm/vmscan.c:5394 [inline]
lru_gen_shrink_node mm/vmscan.c:5511 [inline]
shrink_node+0x2064/0x35f0 mm/vmscan.c:6459
kswapd_shrink_node mm/vmscan.c:7262 [inline]
balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452
kswapd+0x677/0xd60 mm/vmscan.c:7712
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&group->mark_mutex);
lock(fs_reclaim);
lock(&group->mark_mutex);
*** DEADLOCK ***
3 locks held by kswapd0/109:
#0: ffffffff8c8e11c0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:200 [inline]
#0: ffffffff8c8e11c0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7338
#1: ffffffff8c897f30 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:895 [inline]
#1: ffffffff8c897f30 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x660 mm/vmscan.c:1001
#2: ffff8880429940e0 (&type->s_umount_key#50){++++}-{3:3}, at: trylock_super fs/super.c:414 [inline]
#2: ffff8880429940e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79
stack backtrace:
CPU: 1 PID: 109 Comm: kswapd0 Not tainted 6.3.0-rc7-syzkaller-00181-g8e41e0a57566 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
lock_acquire kernel/locking/lockdep.c:5669 [inline]
lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
fsnotify_group_lock include/linux/fsnotify_backend.h:266 [inline]
fsnotify_destroy_mark fs/notify/mark.c:496 [inline]
fsnotify_destroy_marks+0x16a/0x4b0 fs/notify/mark.c:854
fsnotify_inoderemove include/linux/fsnotify.h:193 [inline]
dentry_unlink_inode+0x3aa/0x460 fs/dcache.c:397
__dentry_kill+0x3c0/0x640 fs/dcache.c:607
shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x33a/0x590 fs/super.c:104
do_shrink_slab+0x428/0xaa0 mm/vmscan.c:853
shrink_slab_memcg mm/vmscan.c:922 [inline]
shrink_slab+0x388/0x660 mm/vmscan.c:1001
shrink_one+0x502/0x810 mm/vmscan.c:5343
shrink_many mm/vmscan.c:5394 [inline]
lru_gen_shrink_node mm/vmscan.c:5511 [inline]
shrink_node+0x2064/0x35f0 mm/vmscan.c:6459
kswapd_shrink_node mm/vmscan.c:7262 [inline]
balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452
kswapd+0x677/0xd60 mm/vmscan.c:7712
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>