syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kswapd0/72 is trying to acquire lock:
ffff888042915ad8 (&info->bfs_lock){+.+.}-{4:4}, at: bfs_evict_inode+0x274/0x510 fs/bfs/inode.c:183

but task is already holding lock:
ffffffff8de44f40 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7015 [inline]
ffffffff8de44f40 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2800 mm/vmscan.c:7389

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (fs_reclaim){+.+.}-{0:0}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
       __fs_reclaim_acquire mm/page_alloc.c:4269 [inline]
       fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4283
       might_alloc include/linux/sched/mm.h:318 [inline]
       slab_pre_alloc_hook mm/slub.c:4897 [inline]
       slab_alloc_node mm/slub.c:5221 [inline]
       kmem_cache_alloc_lru_noprof+0x4a/0x6d0 mm/slub.c:5264
       bfs_alloc_inode+0x28/0x40 fs/bfs/inode.c:240
       alloc_inode+0x67/0x1b0 fs/inode.c:346
       iget_locked+0x106/0x580 fs/inode.c:1445
       bfs_iget+0x28/0xaa0 fs/bfs/inode.c:42
       bfs_lookup+0x150/0x1d0 fs/bfs/dir.c:141
       lookup_one_qstr_excl+0x12e/0x360 fs/namei.c:1705
       do_renameat2+0x3dd/0xa50 fs/namei.c:5317
       __do_sys_rename fs/namei.c:5411 [inline]
       __se_sys_rename fs/namei.c:5409 [inline]
       __x64_sys_rename+0x82/0x90 fs/namei.c:5409
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&info->bfs_lock){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908
       __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
       __mutex_lock_common kernel/locking/mutex.c:598 [inline]
       __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760
       bfs_evict_inode+0x274/0x510 fs/bfs/inode.c:183
       evict+0x501/0x9c0 fs/inode.c:810
       __dentry_kill+0x209/0x660 fs/dcache.c:669
       shrink_kill+0xa9/0x2c0 fs/dcache.c:1114
       shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141
       prune_dcache_sb+0x10e/0x180 fs/dcache.c:1222
       super_cache_scan+0x369/0x4b0 fs/super.c:222
       do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437
       shrink_slab_memcg mm/shrinker.c:550 [inline]
       shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
       shrink_one+0x28a/0x7c0 mm/vmscan.c:4955
       shrink_many mm/vmscan.c:5016 [inline]
       lru_gen_shrink_node mm/vmscan.c:5094 [inline]
       shrink_node+0x315d/0x3780 mm/vmscan.c:6081
       kswapd_shrink_node mm/vmscan.c:6941 [inline]
       balance_pgdat mm/vmscan.c:7124 [inline]
       kswapd+0x147c/0x2800 mm/vmscan.c:7389
       kthread+0x70e/0x8a0 kernel/kthread.c:463
       ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&info->bfs_lock);
                               lock(fs_reclaim);
  lock(&info->bfs_lock);

 *** DEADLOCK ***

2 locks held by kswapd0/72:
 #0: ffffffff8de44f40 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7015 [inline]
 #0: ffffffff8de44f40 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2800 mm/vmscan.c:7389
 #1: ffff888010fbc0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline]
 #1: ffff888010fbc0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197

stack backtrace:
CPU: 0 UID: 0 PID: 72 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/mutex.c:598 [inline]
 __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:760
 bfs_evict_inode+0x274/0x510 fs/bfs/inode.c:183
 evict+0x501/0x9c0 fs/inode.c:810
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1114
 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1141
 prune_dcache_sb+0x10e/0x180 fs/dcache.c:1222
 super_cache_scan+0x369/0x4b0 fs/super.c:222
 do_shrink_slab+0x6ef/0x1110 mm/shrinker.c:437
 shrink_slab_memcg mm/shrinker.c:550 [inline]
 shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
 shrink_one+0x28a/0x7c0 mm/vmscan.c:4955
 shrink_many mm/vmscan.c:5016 [inline]
 lru_gen_shrink_node mm/vmscan.c:5094 [inline]
 shrink_node+0x315d/0x3780 mm/vmscan.c:6081
 kswapd_shrink_node mm/vmscan.c:6941 [inline]
 balance_pgdat mm/vmscan.c:7124 [inline]
 kswapd+0x147c/0x2800 mm/vmscan.c:7389
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>