====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc5-syzkaller-00089-g6879c2d3b960 #0 Not tainted ------------------------------------------------------ kswapd0/128 is trying to acquire lock: ffff8880219a8990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 but task is already holding lock: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze_unsafe include/linux/freezer.h:58 [inline] ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze include/linux/freezer.h:67 [inline] ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xd1e/0x1580 mm/vmscan.c:4291 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:4674 [inline] fs_reclaim_acquire+0x115/0x160 mm/page_alloc.c:4688 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:700 [inline] slab_alloc_node mm/slub.c:3157 [inline] kmem_cache_alloc_node_trace+0x3f/0x410 mm/slub.c:3307 kmalloc_node include/linux/slab.h:618 [inline] kzalloc_node include/linux/slab.h:744 [inline] mempool_create_node mm/mempool.c:266 [inline] mempool_create+0x4e/0xc0 mm/mempool.c:255 mempool_create_page_pool include/linux/mempool.h:107 [inline] fscrypt_initialize+0x86/0xa0 fs/crypto/crypto.c:330 fscrypt_setup_encryption_info+0xef/0xe90 fs/crypto/keysetup.c:538 fscrypt_get_encryption_info+0x34a/0x3f0 fs/crypto/keysetup.c:647 fscrypt_setup_filename+0x238/0xec0 fs/crypto/fname.c:458 ext4_fname_setup_filename+0x88/0x110 fs/ext4/crypto.c:28 ext4_find_entry+0x8c/0x140 fs/ext4/namei.c:1720 ext4_rename+0x4d1/0x2650 fs/ext4/namei.c:3809 ext4_rename2+0x1c3/0x270 fs/ext4/namei.c:4164 vfs_rename+0x115e/0x1a90 fs/namei.c:4756 do_renameat2+0xb5e/0xc80 fs/namei.c:4907 __do_sys_renameat2 fs/namei.c:4940 [inline] __se_sys_renameat2 fs/namei.c:4937 [inline] __ia32_sys_renameat2+0xe4/0x120 fs/namei.c:4937 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+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (fscrypt_init_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 fscrypt_initialize+0x3c/0xa0 fs/crypto/crypto.c:324 fscrypt_setup_encryption_info+0xef/0xe90 fs/crypto/keysetup.c:538 fscrypt_get_encryption_info+0x34a/0x3f0 fs/crypto/keysetup.c:647 fscrypt_setup_filename+0x238/0xec0 fs/crypto/fname.c:458 ext4_fname_setup_filename+0x88/0x110 fs/ext4/crypto.c:28 ext4_add_entry+0x3aa/0xef0 fs/ext4/namei.c:2367 ext4_rename+0x190a/0x2650 fs/ext4/namei.c:3884 ext4_rename2+0x1c3/0x270 fs/ext4/namei.c:4164 vfs_rename+0x115e/0x1a90 fs/namei.c:4756 do_renameat2+0xb5e/0xc80 fs/namei.c:4907 __do_sys_renameat2 fs/namei.c:4940 [inline] __se_sys_renameat2 fs/namei.c:4937 [inline] __ia32_sys_renameat2+0xe4/0x120 fs/namei.c:4937 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+0x2f/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:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3829 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 start_this_handle+0xfe7/0x14a0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x38c/0x910 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x3a3/0x490 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5963 __mark_inode_dirty+0x48b/0x1040 fs/fs-writeback.c:2381 mark_inode_dirty_sync include/linux/fs.h:2467 [inline] iput.part.0+0x57/0x810 fs/inode.c:1771 iput+0x58/0x70 fs/inode.c:1764 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282 super_cache_scan+0x336/0x590 fs/super.c:104 do_shrink_slab+0x428/0xbd0 mm/vmscan.c:831 shrink_slab+0x17c/0x6f0 mm/vmscan.c:991 shrink_node_memcgs mm/vmscan.c:3182 [inline] shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304 kswapd_shrink_node mm/vmscan.c:4086 [inline] balance_pgdat+0x8ef/0x1580 mm/vmscan.c:4277 kswapd+0x79b/0xf80 mm/vmscan.c:4537 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 other info that might help us debug this: Chain exists of: jbd2_handle --> fscrypt_init_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(fscrypt_init_mutex); lock(fs_reclaim); lock(jbd2_handle); *** DEADLOCK *** 3 locks held by kswapd0/128: #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze_unsafe include/linux/freezer.h:58 [inline] #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze include/linux/freezer.h:67 [inline] #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xd1e/0x1580 mm/vmscan.c:4291 #1: ffffffff8c084490 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0xc9/0x6f0 mm/vmscan.c:981 #2: ffff8880445e60e0 (&type->s_umount_key#31){++++}-{3:3}, at: trylock_super fs/super.c:415 [inline] #2: ffff8880445e60e0 (&type->s_umount_key#31){++++}-{3:3}, at: super_cache_scan+0x6c/0x590 fs/super.c:79 stack backtrace: CPU: 1 PID: 128 Comm: kswapd0 Not tainted 6.0.0-rc5-syzkaller-00089-g6879c2d3b960 #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+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3829 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 start_this_handle+0xfe7/0x14a0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x38c/0x910 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x3a3/0x490 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5963 __mark_inode_dirty+0x48b/0x1040 fs/fs-writeback.c:2381 mark_inode_dirty_sync include/linux/fs.h:2467 [inline] iput.part.0+0x57/0x810 fs/inode.c:1771 iput+0x58/0x70 fs/inode.c:1764 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282 super_cache_scan+0x336/0x590 fs/super.c:104 do_shrink_slab+0x428/0xbd0 mm/vmscan.c:831 shrink_slab+0x17c/0x6f0 mm/vmscan.c:991 shrink_node_memcgs mm/vmscan.c:3182 [inline] shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304 kswapd_shrink_node mm/vmscan.c:4086 [inline] balance_pgdat+0x8ef/0x1580 mm/vmscan.c:4277 kswapd+0x79b/0xf80 mm/vmscan.c:4537 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306