======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc2-syzkaller-00387-g6c6e47d69d82 #0 Not tainted
------------------------------------------------------
kswapd0/109 is trying to acquire lock:
ffff88805295a018 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206
but task is already holding lock:
ffffffff8d939440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782
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:3698 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3712
might_alloc include/linux/sched/mm.h:312 [inline]
slab_pre_alloc_hook mm/slub.c:3746 [inline]
slab_alloc_node mm/slub.c:3827 [inline]
__do_kmalloc_node mm/slub.c:3965 [inline]
__kmalloc+0xb5/0x440 mm/slub.c:3979
kmalloc include/linux/slab.h:632 [inline]
xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:115 [inline]
xfs_attr_list_ilocked+0x8b7/0x1740 fs/xfs/xfs_attr_list.c:527
xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:547
xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:314
vfs_listxattr+0xb7/0x140 fs/xattr.c:493
ovl_copy_xattr+0x1cd/0xca0 fs/overlayfs/copy_up.c:98
ovl_copy_up_metadata+0x1ad/0x760 fs/overlayfs/copy_up.c:650
ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:870 [inline]
ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
ovl_copy_up_one+0x1b04/0x3490 fs/overlayfs/copy_up.c:1168
ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223
ovl_maybe_copy_up+0x124/0x170 fs/overlayfs/copy_up.c:1253
ovl_open+0x184/0x2b0 fs/overlayfs/file.c:157
do_dentry_open+0x8da/0x18c0 fs/open.c:955
do_open fs/namei.c:3642 [inline]
path_openat+0x1dfb/0x2990 fs/namei.c:3799
do_filp_open+0x1dc/0x430 fs/namei.c:3826
do_sys_openat2+0x17a/0x1e0 fs/open.c:1406
do_sys_open fs/open.c:1421 [inline]
__do_sys_creat fs/open.c:1497 [inline]
__se_sys_creat fs/open.c:1491 [inline]
__ia32_sys_creat+0xcc/0x120 fs/open.c:1491
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x7f/0x89
-> #0 (&xfs_nondir_ilock_class#3){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206
xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline]
xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1713
xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762
xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011
super_cache_scan+0x409/0x550 fs/super.c:227
do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
shrink_slab+0x18a/0x1310 mm/shrinker.c:662
shrink_one+0x493/0x7c0 mm/vmscan.c:4774
shrink_many mm/vmscan.c:4835 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935
shrink_node mm/vmscan.c:5894 [inline]
kswapd_shrink_node mm/vmscan.c:6704 [inline]
balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895
kswapd+0x5ea/0xbf0 mm/vmscan.c:7164
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&xfs_nondir_ilock_class#3);
lock(fs_reclaim);
lock(&xfs_nondir_ilock_class#3);
*** DEADLOCK ***
2 locks held by kswapd0/109:
#0: ffffffff8d939440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782
#1: ffff888056ec20e0 (&type->s_umount_key#55){++++}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline]
#1: ffff888056ec20e0 (&type->s_umount_key#55){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196
stack backtrace:
CPU: 3 PID: 109 Comm: kswapd0 Not tainted 6.9.0-rc2-syzkaller-00387-g6c6e47d69d82 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206
xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline]
xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1713
xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762
xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011
super_cache_scan+0x409/0x550 fs/super.c:227
do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
shrink_slab+0x18a/0x1310 mm/shrinker.c:662
shrink_one+0x493/0x7c0 mm/vmscan.c:4774
shrink_many mm/vmscan.c:4835 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935
shrink_node mm/vmscan.c:5894 [inline]
kswapd_shrink_node mm/vmscan.c:6704 [inline]
balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895
kswapd+0x5ea/0xbf0 mm/vmscan.c:7164
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
------------[ cut here ]------------
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 2 PID: 109 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31
Modules linked in:
CPU: 2 PID: 109 Comm: kswapd0 Not tainted 6.9.0-rc2-syzkaller-00387-g6c6e47d69d82 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31
Code: 8b e8 b7 db d3 fc 90 0f 0b 90 90 e9 c3 fe ff ff e8 38 08 11 fd c6 05 64 18 0c 0b 01 90 48 c7 c7 00 d4 6e 8b e8 94 db d3 fc 90 <0f> 0b 90 90 e9 a0 fe ff ff 48 89 ef e8 72 8e 6d fd e9 44 fe ff ff
RSP: 0018:ffffc90000e4f170 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8150ed29
RDX: ffff888019ae2440 RSI: ffffffff8150ed36 RDI: 0000000000000001
RBP: ffff88801dc4d07c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 746e756f63666572 R12: ffff88801dc4d07c
R13: 0000000000000000 R14: 00000000020c01e1 R15: ffff88801692edf8
FS: 0000000000000000(0000) GS:ffff88802c400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001c98008 CR3: 000000002123c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_dec include/linux/refcount.h:336 [inline]
refcount_dec include/linux/refcount.h:351 [inline]
dec_stack_record_count mm/page_owner.c:228 [inline]
__reset_page_owner+0x2ea/0x370 mm/page_owner.c:266
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1141 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
free_unref_folios+0x256/0xad0 mm/page_alloc.c:2536
shrink_folio_list+0x32e8/0x3f00 mm/vmscan.c:1428
evict_folios+0x6e1/0x1bc0 mm/vmscan.c:4537
try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4733
shrink_one+0x3f8/0x7c0 mm/vmscan.c:4772
shrink_many mm/vmscan.c:4835 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935
shrink_node mm/vmscan.c:5894 [inline]
kswapd_shrink_node mm/vmscan.c:6704 [inline]
balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895
kswapd+0x5ea/0xbf0 mm/vmscan.c:7164
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243