====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc2-syzkaller-00007-gf06ce441457d #0 Not tainted ------------------------------------------------------ kswapd0/88 is trying to acquire lock: ffff88807835bf18 (&xfs_nondir_ilock_class#4){++++}-{3:3}, at: xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:207 but task is already holding lock: ffffffff8dd3b440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x18f0 mm/vmscan.c:6798 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:3783 [inline] fs_reclaim_acquire+0x102/0x160 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+0xb5/0x410 mm/slub.c:4134 kmalloc_noprof include/linux/slab.h:664 [inline] xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:117 [inline] xfs_attr_list_ilocked+0x9a0/0x1b00 fs/xfs/xfs_attr_list.c:569 xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:595 xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:324 vfs_listxattr+0xba/0x140 fs/xattr.c:493 listxattr+0x69/0x190 fs/xattr.c:840 __do_sys_flistxattr fs/xattr.c:893 [inline] __se_sys_flistxattr fs/xattr.c:885 [inline] __x64_sys_flistxattr+0x156/0x1e0 fs/xattr.c:885 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&xfs_nondir_ilock_class#4){++++}-{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:207 xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1711 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1760 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1009 super_cache_scan+0x40c/0x550 fs/super.c:227 do_shrink_slab+0x452/0x11c0 mm/shrinker.c:435 shrink_slab+0x18a/0x1310 mm/shrinker.c:662 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node mm/vmscan.c:4951 [inline] shrink_node+0x22bd/0x39b0 mm/vmscan.c:5910 kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x9a0/0x18f0 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 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_nondir_ilock_class#4); lock(fs_reclaim); lock(&xfs_nondir_ilock_class#4); *** DEADLOCK *** 2 locks held by kswapd0/88: #0: ffffffff8dd3b440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x18f0 mm/vmscan.c:6798 #1: ffff88815b0d00e0 (&type->s_umount_key#88){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline] #1: ffff88815b0d00e0 (&type->s_umount_key#88){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196 stack backtrace: CPU: 1 PID: 88 Comm: kswapd0 Not tainted 6.10.0-rc2-syzkaller-00007-gf06ce441457d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 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:207 xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1711 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1760 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1009 super_cache_scan+0x40c/0x550 fs/super.c:227 do_shrink_slab+0x452/0x11c0 mm/shrinker.c:435 shrink_slab+0x18a/0x1310 mm/shrinker.c:662 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node mm/vmscan.c:4951 [inline] shrink_node+0x22bd/0x39b0 mm/vmscan.c:5910 kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x9a0/0x18f0 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244