======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-10323-g8f6a15f095a6 #0 Not tainted
------------------------------------------------------
kswapd0/89 is trying to acquire lock:
ffff88805ce5b758 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline]
ffff88805ce5b758 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline]
ffff88805ce5b758 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_icwalk_ag+0x120e/0x1ad0 fs/xfs/xfs_icache.c:1711

but task is already holding lock:
ffffffff8e429680 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6798 [inline]
ffffffff8e429680 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb1e/0x2f30 mm/vmscan.c:7180

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (fs_reclaim){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __fs_reclaim_acquire mm/page_alloc.c:3783 [inline]
       fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3797
       might_alloc include/linux/sched/mm.h:334 [inline]
       slab_pre_alloc_hook mm/slub.c:3890 [inline]
       slab_alloc_node mm/slub.c:3980 [inline]
       __do_kmalloc_node mm/slub.c:4120 [inline]
       __kmalloc_noprof+0xae/0x410 mm/slub.c:4134
       kmalloc_noprof include/linux/slab.h:664 [inline]
       xfs_attr_shortform_list+0x753/0x1900 fs/xfs/xfs_attr_list.c:117
       xfs_attr_list+0x1d0/0x270 fs/xfs/xfs_attr_list.c:595
       xfs_vn_listxattr+0x1d2/0x2c0 fs/xfs/xfs_xattr.c:324
       vfs_listxattr fs/xattr.c:493 [inline]
       listxattr+0x107/0x290 fs/xattr.c:840
       path_listxattr fs/xattr.c:864 [inline]
       __do_sys_llistxattr fs/xattr.c:882 [inline]
       __se_sys_llistxattr fs/xattr.c:879 [inline]
       __x64_sys_llistxattr+0x173/0x230 fs/xattr.c:879
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&xfs_dir_ilock_class){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
       xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline]
       xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline]
       xfs_icwalk_ag+0x120e/0x1ad0 fs/xfs/xfs_icache.c:1711
       xfs_icwalk fs/xfs/xfs_icache.c:1760 [inline]
       xfs_reclaim_inodes_nr+0x257/0x360 fs/xfs/xfs_icache.c:1009
       super_cache_scan+0x40f/0x4b0 fs/super.c:227
       do_shrink_slab+0x705/0x1160 mm/shrinker.c:435
       shrink_slab+0x1092/0x14d0 mm/shrinker.c:662
       shrink_node_memcgs mm/vmscan.c:5891 [inline]
       shrink_node+0x10ec/0x2a30 mm/vmscan.c:5924
       kswapd_shrink_node mm/vmscan.c:6720 [inline]
       balance_pgdat mm/vmscan.c:6911 [inline]
       kswapd+0x19a4/0x2f30 mm/vmscan.c:7180
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&xfs_dir_ilock_class);
                               lock(fs_reclaim);
  lock(&xfs_dir_ilock_class);

 *** DEADLOCK ***

2 locks held by kswapd0/89:
 #0: ffffffff8e429680 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6798 [inline]
 #0: ffffffff8e429680 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb1e/0x2f30 mm/vmscan.c:7180
 #1: ffff8881ba4a00e0 (&type->s_umount_key#85){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline]
 #1: ffff8881ba4a00e0 (&type->s_umount_key#85){++++}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196

stack backtrace:
CPU: 1 PID: 89 Comm: kswapd0 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_noncircular+0x36a/0x4a0 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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
 xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline]
 xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline]
 xfs_icwalk_ag+0x120e/0x1ad0 fs/xfs/xfs_icache.c:1711
 xfs_icwalk fs/xfs/xfs_icache.c:1760 [inline]
 xfs_reclaim_inodes_nr+0x257/0x360 fs/xfs/xfs_icache.c:1009
 super_cache_scan+0x40f/0x4b0 fs/super.c:227
 do_shrink_slab+0x705/0x1160 mm/shrinker.c:435
 shrink_slab+0x1092/0x14d0 mm/shrinker.c:662
 shrink_node_memcgs mm/vmscan.c:5891 [inline]
 shrink_node+0x10ec/0x2a30 mm/vmscan.c:5924
 kswapd_shrink_node mm/vmscan.c:6720 [inline]
 balance_pgdat mm/vmscan.c:6911 [inline]
 kswapd+0x19a4/0x2f30 mm/vmscan.c:7180
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>