====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc2-syzkaller-00010-g2ab795141095 #0 Not tainted ------------------------------------------------------ kswapd0/89 is trying to acquire lock: ffff888059c4de18 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_can_free_eofblocks+0x667/0x940 fs/xfs/xfs_bmap_util.c:552 but task is already holding lock: ffffffff8e42b240 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6798 [inline] ffffffff8e42b240 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xbe8/0x3700 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+0xa9/0x400 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+0x109/0x290 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+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #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+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1651 xfs_can_free_eofblocks+0x667/0x940 fs/xfs/xfs_bmap_util.c:552 xfs_inode_mark_reclaimable+0x1bb/0xf60 fs/xfs/xfs_icache.c:2147 destroy_inode fs/inode.c:311 [inline] evict+0x54b/0x630 fs/inode.c:682 dispose_list fs/inode.c:700 [inline] prune_icache_sb+0x239/0x2f0 fs/inode.c:885 super_cache_scan+0x38c/0x4b0 fs/super.c:223 do_shrink_slab+0x707/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x87c/0x14d0 mm/shrinker.c:626 shrink_one+0x453/0x880 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node mm/vmscan.c:4951 [inline] shrink_node+0x37eb/0x3fe0 mm/vmscan.c:5910 kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat mm/vmscan.c:6911 [inline] kswapd+0x1882/0x3700 mm/vmscan.c:7180 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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#3); lock(fs_reclaim); rlock(&xfs_nondir_ilock_class#3); *** DEADLOCK *** 2 locks held by kswapd0/89: #0: ffffffff8e42b240 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6798 [inline] #0: ffffffff8e42b240 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xbe8/0x3700 mm/vmscan.c:7180 #1: ffff88802500e0e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline] #1: ffff88802500e0e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196 stack backtrace: CPU: 0 PID: 89 Comm: kswapd0 Not tainted 6.10.0-rc2-syzkaller-00010-g2ab795141095 #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+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+0x18e0/0x5900 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1651 xfs_can_free_eofblocks+0x667/0x940 fs/xfs/xfs_bmap_util.c:552 xfs_inode_mark_reclaimable+0x1bb/0xf60 fs/xfs/xfs_icache.c:2147 destroy_inode fs/inode.c:311 [inline] evict+0x54b/0x630 fs/inode.c:682 dispose_list fs/inode.c:700 [inline] prune_icache_sb+0x239/0x2f0 fs/inode.c:885 super_cache_scan+0x38c/0x4b0 fs/super.c:223 do_shrink_slab+0x707/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x87c/0x14d0 mm/shrinker.c:626 shrink_one+0x453/0x880 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node mm/vmscan.c:4951 [inline] shrink_node+0x37eb/0x3fe0 mm/vmscan.c:5910 kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat mm/vmscan.c:6911 [inline] kswapd+0x1882/0x3700 mm/vmscan.c:7180 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244