====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc3-syzkaller-00165-g3b517966c561 #0 Not tainted ------------------------------------------------------ kswapd0/108 is trying to acquire lock: ffff88804475a988 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10d6/0x15e0 fs/jbd2/transaction.c:463 but task is already holding lock: ffffffff8cd15c00 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x1b4/0x1b80 mm/vmscan.c:7409 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:3551 [inline] fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3565 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x51/0x340 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node+0x52/0x110 mm/slab_common.c:1030 kmalloc_node include/linux/slab.h:619 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:607 kvmalloc include/linux/slab.h:737 [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/0x3ca0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0xcbf/0x30e0 fs/ext4/xattr.c:2039 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:5803 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5846 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5924 ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:5956 __mark_inode_dirty+0x1e0/0xd50 fs/fs-writeback.c:2435 generic_update_time+0xcf/0xf0 fs/inode.c:1936 inode_update_time fs/inode.c:1949 [inline] touch_atime+0x4eb/0x5d0 fs/inode.c:2020 file_accessed include/linux/fs.h:2291 [inline] iterate_dir+0x463/0x5f0 fs/readdir.c:109 __do_sys_getdents64 fs/readdir.c:405 [inline] __se_sys_getdents64 fs/readdir.c:390 [inline] __ia32_sys_getdents64+0x14f/0x2e0 fs/readdir.c:390 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1573 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:337 [inline] ovl_workdir_create+0x4a1/0x820 fs/overlayfs/super.c:337 ovl_make_workdir fs/overlayfs/super.c:718 [inline] ovl_get_workdir fs/overlayfs/super.c:876 [inline] ovl_fill_super+0xda7/0x6360 fs/overlayfs/super.c:1412 vfs_get_super fs/super.c:1335 [inline] get_tree_nodev+0xd6/0x180 fs/super.c:1354 vfs_get_tree+0x8c/0x370 fs/super.c:1750 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #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:5953 __mark_inode_dirty+0x1e0/0xd50 fs/fs-writeback.c:2435 mark_inode_dirty_sync include/linux/fs.h:2242 [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+0x31f/0x540 fs/super.c:228 do_shrink_slab+0x422/0xaa0 mm/vmscan.c:900 shrink_slab+0x17f/0x6e0 mm/vmscan.c:1060 shrink_one+0x4f7/0x700 mm/vmscan.c:5417 shrink_many mm/vmscan.c:5469 [inline] lru_gen_shrink_node mm/vmscan.c:5586 [inline] shrink_node+0x20d4/0x37a0 mm/vmscan.c:6526 kswapd_shrink_node mm/vmscan.c:7331 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:7521 kswapd+0x5be/0xbf0 mm/vmscan.c:7781 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:304 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 *** 3 locks held by kswapd0/108: #0: ffffffff8cd15c00 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x1b4/0x1b80 mm/vmscan.c:7409 #1: ffffffff8ccc6e30 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0xc5/0x6e0 mm/vmscan.c:1050 #2: ffff8880446480e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared fs/super.c:607 [inline] #2: ffff8880446480e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x74/0x540 fs/super.c:203 stack backtrace: CPU: 3 PID: 108 Comm: kswapd0 Not tainted 6.6.0-rc3-syzkaller-00165-g3b517966c561 #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:5953 __mark_inode_dirty+0x1e0/0xd50 fs/fs-writeback.c:2435 mark_inode_dirty_sync include/linux/fs.h:2242 [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+0x31f/0x540 fs/super.c:228 do_shrink_slab+0x422/0xaa0 mm/vmscan.c:900 shrink_slab+0x17f/0x6e0 mm/vmscan.c:1060 shrink_one+0x4f7/0x700 mm/vmscan.c:5417 shrink_many mm/vmscan.c:5469 [inline] lru_gen_shrink_node mm/vmscan.c:5586 [inline] shrink_node+0x20d4/0x37a0 mm/vmscan.c:6526 kswapd_shrink_node mm/vmscan.c:7331 [inline] balance_pgdat+0xa32/0x1b80 mm/vmscan.c:7521 kswapd+0x5be/0xbf0 mm/vmscan.c:7781 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:304