====================================================== WARNING: possible circular locking dependency detected 6.4.0-syzkaller-08881-g533925cb7604 #0 Not tainted ------------------------------------------------------ kswapd0/113 is trying to acquire lock: ffff8880207e4988 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb6/0x14e0 fs/jbd2/transaction.c:461 but task is already holding lock: ffffffff8c9066e0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:517 [inline] ffffffff8c9066e0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7391 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:3602 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3616 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x4b/0x350 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:992 kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:717 [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+0x1d93/0x3810 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x618/0x2fd0 fs/ext4/xattr.c:1956 ext4_xattr_move_to_block fs/ext4/xattr.c:2653 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2728 [inline] ext4_expand_extra_isize_ea+0xa7b/0x1810 fs/ext4/xattr.c:2820 __ext4_expand_extra_isize+0x33e/0x470 fs/ext4/inode.c:5769 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5812 [inline] __ext4_mark_inode_dirty+0x51b/0x800 fs/ext4/inode.c:5890 __ext4_unlink+0x667/0xcd0 fs/ext4/namei.c:3290 ext4_unlink+0x41f/0x590 fs/ext4/namei.c:3319 vfs_unlink+0x355/0x930 fs/namei.c:4329 do_unlinkat+0x3e3/0x680 fs/namei.c:4395 __do_sys_unlinkat fs/namei.c:4438 [inline] __se_sys_unlinkat fs/namei.c:4431 [inline] __ia32_sys_unlinkat+0xc1/0x130 fs/namei.c:4431 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 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+0x92/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x160/0x1510 fs/ext4/xattr.c:2357 ext4_xattr_set+0x144/0x360 fs/ext4/xattr.c:2544 __vfs_setxattr+0x173/0x1e0 fs/xattr.c:201 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:235 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:296 vfs_setxattr+0x143/0x340 fs/xattr.c:322 do_setxattr+0x147/0x190 fs/xattr.c:630 setxattr+0x146/0x160 fs/xattr.c:653 path_setxattr+0x197/0x1c0 fs/xattr.c:672 __do_sys_lsetxattr fs/xattr.c:695 [inline] __se_sys_lsetxattr fs/xattr.c:691 [inline] __ia32_sys_lsetxattr+0xbd/0x150 fs/xattr.c:691 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 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:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 start_this_handle+0xfe9/0x14e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x390/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x411/0x5d0 fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0xa5/0x130 fs/ext4/inode.c:5919 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2430 mark_inode_dirty_sync include/linux/fs.h:2153 [inline] iput.part.0+0x57/0x740 fs/inode.c:1812 iput+0x5c/0x80 fs/inode.c:1805 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x428/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1048 shrink_one+0x4f9/0x710 mm/vmscan.c:5403 shrink_many mm/vmscan.c:5453 [inline] lru_gen_shrink_node mm/vmscan.c:5570 [inline] shrink_node+0x20ed/0x3690 mm/vmscan.c:6510 kswapd_shrink_node mm/vmscan.c:7315 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7505 kswapd+0x677/0xd60 mm/vmscan.c:7765 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 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 kswapd0/113: #0: ffffffff8c9066e0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:517 [inline] #0: ffffffff8c9066e0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7391 #1: ffffffff8c8b85f0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:942 [inline] #1: ffffffff8c8b85f0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x6c0 mm/vmscan.c:1048 #2: ffff88801cf000e0 (&type->s_umount_key#32){++++}-{3:3}, at: trylock_super fs/super.c:413 [inline] #2: ffff88801cf000e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79 stack backtrace: CPU: 1 PID: 113 Comm: kswapd0 Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x2df/0x3b0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 start_this_handle+0xfe9/0x14e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x390/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x411/0x5d0 fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0xa5/0x130 fs/ext4/inode.c:5919 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2430 mark_inode_dirty_sync include/linux/fs.h:2153 [inline] iput.part.0+0x57/0x740 fs/inode.c:1812 iput+0x5c/0x80 fs/inode.c:1805 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x428/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1048 shrink_one+0x4f9/0x710 mm/vmscan.c:5403 shrink_many mm/vmscan.c:5453 [inline] lru_gen_shrink_node mm/vmscan.c:5570 [inline] shrink_node+0x20ed/0x3690 mm/vmscan.c:6510 kswapd_shrink_node mm/vmscan.c:7315 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7505 kswapd+0x677/0xd60 mm/vmscan.c:7765 kthread+0x344/0x440 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308