WARNING: possible circular locking dependency detected 6.4.0-syzkaller #0 Not tainted ------------------------------------------------------ kswapd0/111 is trying to acquire lock: ffff88801cd8a990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 but task is already holding lock: ffff88801d778650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:665 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1494 [inline] sb_start_intwrite include/linux/fs.h:1616 [inline] ext4_evict_inode+0xe26/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1747 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 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:895 shrink_slab_memcg mm/vmscan.c:964 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1043 shrink_one+0x4f9/0x710 mm/vmscan.c:5365 shrink_many mm/vmscan.c:5415 [inline] lru_gen_shrink_node mm/vmscan.c:5532 [inline] shrink_node+0x1fd5/0x3500 mm/vmscan.c:6473 kswapd_shrink_node mm/vmscan.c:7273 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7463 kswapd+0x677/0xd60 mm/vmscan.c:7723 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slub.c:3433 [inline] __kmem_cache_alloc_node+0x41/0x320 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:697 [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:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x51b/0x800 fs/ext4/inode.c:5916 __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:4327 do_unlinkat+0x3e3/0x680 fs/namei.c:4393 __do_sys_unlink fs/namei.c:4441 [inline] __se_sys_unlink fs/namei.c:4439 [inline] __ia32_sys_unlink+0xca/0x110 fs/namei.c:4439 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_read+0x9c/0x480 kernel/locking/rwsem.c:1520 ext4_setattr+0x10a9/0x2880 fs/ext4/inode.c:5330 notify_change+0xb2c/0x1180 fs/attr.c:483 chown_common+0x57f/0x650 fs/open.c:774 do_fchownat+0x12a/0x1e0 fs/open.c:805 ksys_lchown include/linux/syscalls.h:1336 [inline] __do_sys_lchown16 kernel/uid16.c:30 [inline] __se_sys_lchown16 kernel/uid16.c:28 [inline] __ia32_sys_lchown16+0xe3/0x110 kernel/uid16.c:28 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:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 start_this_handle+0xfe7/0x14e0 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_evict_inode+0x616/0x1a30 fs/ext4/inode.c:223 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1747 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 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:895 shrink_slab_memcg mm/vmscan.c:964 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1043 shrink_one+0x4f9/0x710 mm/vmscan.c:5365 shrink_many mm/vmscan.c:5415 [inline] lru_gen_shrink_node mm/vmscan.c:5532 [inline] shrink_node+0x1fd5/0x3500 mm/vmscan.c:6473 kswapd_shrink_node mm/vmscan.c:7273 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7463 kswapd+0x677/0xd60 mm/vmscan.c:7723 kthread+0x344/0x440 kernel/kthread.c:379 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 --> fs_reclaim --> sb_internal Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal); lock(fs_reclaim); lock(sb_internal); rlock(jbd2_handle); *** DEADLOCK *** 4 locks held by kswapd0/111: #0: ffffffff8c8eff60 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:512 [inline] #0: ffffffff8c8eff60 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7349 #1: ffffffff8c8a3f90 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:937 [inline] #1: ffffffff8c8a3f90 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x6c0 mm/vmscan.c:1043 #2: ffff88801d7780e0 (&type->s_umount_key#32){++++}-{3:3}, at: trylock_super fs/super.c:414 [inline] #2: ffff88801d7780e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79 #3: ffff88801d778650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:665 stack backtrace: CPU: 1 PID: 111 Comm: kswapd0 Not tainted 6.4.0-syzkaller #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+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 start_this_handle+0xfe7/0x14e0 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_evict_inode+0x616/0x1a30 fs/ext4/inode.c:223 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1747 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 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:895 shrink_slab_memcg mm/vmscan.c:964 [inline] shrink_slab+0x38f/0x6c0 mm/vmscan.c:1043 shrink_one+0x4f9/0x710 mm/vmscan.c:5365 shrink_many mm/vmscan.c:5415 [inline] lru_gen_shrink_node mm/vmscan.c:5532 [inline] shrink_node+0x1fd5/0x3500 mm/vmscan.c:6473 kswapd_shrink_node mm/vmscan.c:7273 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7463 kswapd+0x677/0xd60 mm/vmscan.c:7723 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308