====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #0 Not tainted ------------------------------------------------------ kswapd0/110 is trying to acquire lock: ffff888025ea0950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10db/0x15e0 fs/jbd2/transaction.c:463 but task is already holding lock: ffffffff8d9373c0 (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: -> #2 (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_node+0xbb/0x480 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0x9d/0x1a0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1581 [inline] ext4_xattr_set_entry+0xdc3/0x3b20 fs/ext4/xattr.c:1718 ext4_xattr_block_set+0xd07/0x3080 fs/ext4/xattr.c:2037 ext4_xattr_move_to_block fs/ext4/xattr.c:2654 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2729 [inline] ext4_expand_extra_isize_ea+0xf57/0x1990 fs/ext4/xattr.c:2821 __ext4_expand_extra_isize+0x322/0x450 fs/ext4/inode.c:5789 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5832 [inline] __ext4_mark_inode_dirty+0x55a/0x890 fs/ext4/inode.c:5910 __ext4_unlink+0x630/0xcb0 fs/ext4/namei.c:3292 ext4_unlink+0x422/0x610 fs/ext4/namei.c:3321 vfs_unlink+0x2fb/0x910 fs/namei.c:4335 do_unlinkat+0x5c0/0x750 fs/namei.c:4399 __do_sys_unlink fs/namei.c:4447 [inline] __se_sys_unlink fs/namei.c:4445 [inline] __ia32_sys_unlink+0xc6/0x110 fs/namei.c:4445 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x156/0x16d0 fs/ext4/xattr.c:2358 __ext4_set_acl+0x366/0x5d0 fs/ext4/acl.c:217 ext4_set_acl+0x2a0/0x5a0 fs/ext4/acl.c:259 set_posix_acl+0x25c/0x320 fs/posix_acl.c:955 vfs_remove_acl+0x2d1/0x630 fs/posix_acl.c:1242 ovl_do_remove_acl fs/overlayfs/overlayfs.h:349 [inline] ovl_workdir_create+0x4a5/0x820 fs/overlayfs/super.c:340 ovl_make_workdir fs/overlayfs/super.c:656 [inline] ovl_get_workdir fs/overlayfs/super.c:814 [inline] ovl_fill_super+0xe60/0x6960 fs/overlayfs/super.c:1382 vfs_get_super fs/super.c:1268 [inline] get_tree_nodev+0xda/0x190 fs/super.c:1287 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #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: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 start_this_handle+0x1101/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x358/0x660 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:5939 __mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2477 mark_inode_dirty_sync include/linux/fs.h:2410 [inline] iput.part.0+0x5b/0x7f0 fs/inode.c:1764 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 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:244 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 kswapd0/110: #0: ffffffff8d9373c0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782 #1: ffff88801ddb40e0 (&type->s_umount_key#33){++++}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline] #1: ffff88801ddb40e0 (&type->s_umount_key#33){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196 stack backtrace: CPU: 2 PID: 110 Comm: kswapd0 Not tainted 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #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 start_this_handle+0x1101/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x358/0x660 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:5939 __mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2477 mark_inode_dirty_sync include/linux/fs.h:2410 [inline] iput.part.0+0x5b/0x7f0 fs/inode.c:1764 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 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:244