====================================================== WARNING: possible circular locking dependency detected 6.6.0-syzkaller-15365-g305230142ae0 #0 Not tainted ------------------------------------------------------ kswapd0/106 is trying to acquire lock: ffff88804514c950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10d6/0x15e0 fs/jbd2/transaction.c:463 but task is already holding lock: ffffffff8d11d120 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x1b4/0x1b80 mm/vmscan.c:6716 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3693 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:738 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3ce0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x3180 fs/ext4/xattr.c:1970 ext4_xattr_move_to_block fs/ext4/xattr.c:2667 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2742 [inline] ext4_expand_extra_isize_ea+0x1306/0x1b20 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x342/0x470 fs/ext4/inode.c:5812 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5855 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5933 ext4_set_acl+0x44f/0x5a0 fs/ext4/acl.c:263 set_posix_acl+0x259/0x320 fs/posix_acl.c:956 vfs_set_acl+0x539/0x900 fs/posix_acl.c:1135 do_set_acl+0xda/0x1b0 fs/posix_acl.c:1280 do_setxattr+0xeb/0x170 fs/xattr.c:627 setxattr+0x159/0x170 fs/xattr.c:653 path_setxattr+0x175/0x1d0 fs/xattr.c:672 __do_sys_setxattr fs/xattr.c:688 [inline] __se_sys_setxattr fs/xattr.c:684 [inline] __ia32_sys_setxattr+0xc0/0x160 fs/xattr.c:684 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255 entry_SYSENTER_compat_after_hwframe+0x70/0x7a -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1579 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x159/0x1420 fs/ext4/xattr.c:2371 __ext4_set_acl+0x362/0x5d0 fs/ext4/acl.c:217 ext4_set_acl+0x2a0/0x5a0 fs/ext4/acl.c:259 set_posix_acl+0x259/0x320 fs/posix_acl.c:956 vfs_remove_acl+0x2cd/0x620 fs/posix_acl.c:1243 ovl_do_remove_acl fs/overlayfs/overlayfs.h:348 [inline] ovl_workdir_create+0x4a1/0x820 fs/overlayfs/super.c:348 ovl_make_workdir fs/overlayfs/super.c:662 [inline] ovl_get_workdir fs/overlayfs/super.c:820 [inline] ovl_fill_super+0xe57/0x6550 fs/overlayfs/super.c:1376 vfs_get_super fs/super.c:1338 [inline] get_tree_nodev+0xd6/0x180 fs/super.c:1357 vfs_get_tree+0x8c/0x370 fs/super.c:1771 do_new_mount fs/namespace.c:3337 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3664 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount fs/namespace.c:3863 [inline] __ia32_sys_mount+0x291/0x310 fs/namespace.c:3863 do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:230 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255 entry_SYSENTER_compat_after_hwframe+0x70/0x7a -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 start_this_handle+0x10fc/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x690 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x40f/0x5c0 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:5962 __mark_inode_dirty+0x1e0/0xd50 fs/fs-writeback.c:2452 mark_inode_dirty_sync include/linux/fs.h:2311 [inline] iput.part.0+0x5b/0x7a0 fs/inode.c:1798 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x22b/0x7d0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x327/0x540 fs/super.c:228 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa83/0x1310 mm/shrinker.c:626 shrink_one+0x4f7/0x700 mm/vmscan.c:4724 shrink_many mm/vmscan.c:4776 [inline] lru_gen_shrink_node mm/vmscan.c:4893 [inline] shrink_node+0x20cd/0x3790 mm/vmscan.c:5833 kswapd_shrink_node mm/vmscan.c:6638 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:6828 kswapd+0x5be/0xbf0 mm/vmscan.c:7088 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 other info that might help us debug this: Chain exists of: jbd2_handle --> &ei->xattr_sem --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&ei->xattr_sem); lock(fs_reclaim); rlock(jbd2_handle); *** DEADLOCK *** 2 locks held by kswapd0/106: #0: ffffffff8d11d120 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x1b4/0x1b80 mm/vmscan.c:6716 #1: ffff8880459900e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared fs/super.c:610 [inline] #1: ffff8880459900e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x96/0x540 fs/super.c:203 stack backtrace: CPU: 1 PID: 106 Comm: kswapd0 Not tainted 6.6.0-syzkaller-15365-g305230142ae0 #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+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 start_this_handle+0x10fc/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x690 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x40f/0x5c0 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:5962 __mark_inode_dirty+0x1e0/0xd50 fs/fs-writeback.c:2452 mark_inode_dirty_sync include/linux/fs.h:2311 [inline] iput.part.0+0x5b/0x7a0 fs/inode.c:1798 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x22b/0x7d0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x327/0x540 fs/super.c:228 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa83/0x1310 mm/shrinker.c:626 shrink_one+0x4f7/0x700 mm/vmscan.c:4724 shrink_many mm/vmscan.c:4776 [inline] lru_gen_shrink_node mm/vmscan.c:4893 [inline] shrink_node+0x20cd/0x3790 mm/vmscan.c:5833 kswapd_shrink_node mm/vmscan.c:6638 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:6828 kswapd+0x5be/0xbf0 mm/vmscan.c:7088 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242