====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc1-syzkaller-00274-g134231664868 #0 Not tainted ------------------------------------------------------ kswapd0/101 is trying to acquire lock: ffff88801b0b2990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 but task is already holding lock: ffffffff8c8e82a0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:200 [inline] ffffffff8c8e82a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7338 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:4716 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4730 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:728 [inline] slab_alloc_node mm/slub.c:3434 [inline] __kmem_cache_alloc_node+0x41/0x320 mm/slub.c:3491 kmalloc_node_trace+0x21/0x60 mm/slab_common.c:1074 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:731 [inline] mempool_create_node mm/mempool.c:272 [inline] mempool_create+0x52/0xc0 mm/mempool.c:261 mempool_create_page_pool include/linux/mempool.h:112 [inline] fscrypt_initialize+0x8a/0xa0 fs/crypto/crypto.c:332 fscrypt_setup_encryption_info+0xef/0xeb0 fs/crypto/keysetup.c:563 fscrypt_get_encryption_info+0x375/0x450 fs/crypto/keysetup.c:668 fscrypt_setup_filename+0x23c/0xec0 fs/crypto/fname.c:458 __fscrypt_prepare_lookup+0x2c/0xf0 fs/crypto/hooks.c:100 fscrypt_prepare_lookup include/linux/fscrypt.h:935 [inline] ext4_fname_prepare_lookup+0x1be/0x200 fs/ext4/crypto.c:46 ext4_lookup_entry fs/ext4/namei.c:1744 [inline] ext4_lookup fs/ext4/namei.c:1819 [inline] ext4_lookup+0x131/0x700 fs/ext4/namei.c:1810 __lookup_hash+0x117/0x180 fs/namei.c:1602 filename_create+0x1d6/0x4a0 fs/namei.c:3809 do_mknodat+0x19e/0x530 fs/namei.c:3953 __do_sys_mknodat fs/namei.c:3994 [inline] __se_sys_mknodat fs/namei.c:3991 [inline] __ia32_sys_mknodat+0xad/0xe0 fs/namei.c:3991 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 (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+0x40/0xa0 fs/crypto/crypto.c:326 fscrypt_setup_encryption_info+0xef/0xeb0 fs/crypto/keysetup.c:563 fscrypt_get_encryption_info+0x375/0x450 fs/crypto/keysetup.c:668 fscrypt_setup_filename+0x23c/0xec0 fs/crypto/fname.c:458 ext4_fname_setup_filename+0x8c/0x110 fs/ext4/crypto.c:28 ext4_add_entry+0x3aa/0xe30 fs/ext4/namei.c:2379 ext4_rename+0x1a86/0x27c0 fs/ext4/namei.c:3917 ext4_rename2+0x1c7/0x270 fs/ext4/namei.c:4202 vfs_rename+0xef6/0x17a0 fs/namei.c:4772 do_renameat2+0xb62/0xc90 fs/namei.c:4923 __do_sys_renameat2 fs/namei.c:4956 [inline] __se_sys_renameat2 fs/namei.c:4953 [inline] __ia32_sys_renameat2+0xe8/0x120 fs/namei.c:4953 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:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x5b0 kernel/locking/lockdep.c:5634 start_this_handle+0xfe7/0x14e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x390/0x940 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x4fc/0x750 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:6110 __mark_inode_dirty+0x1e0/0x1030 fs/fs-writeback.c:2421 mark_inode_dirty_sync include/linux/fs.h:2132 [inline] iput.part.0+0x57/0x830 fs/inode.c:1771 iput+0x5c/0x80 fs/inode.c:1764 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+0x428/0xc00 mm/vmscan.c:853 shrink_slab_memcg mm/vmscan.c:922 [inline] shrink_slab+0x388/0x660 mm/vmscan.c:1001 shrink_one+0x502/0x810 mm/vmscan.c:5343 shrink_many mm/vmscan.c:5394 [inline] lru_gen_shrink_node mm/vmscan.c:5511 [inline] shrink_node+0x2064/0x35f0 mm/vmscan.c:6459 kswapd_shrink_node mm/vmscan.c:7262 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452 kswapd+0x677/0xec0 mm/vmscan.c:7712 kthread+0x2e8/0x3a0 kernel/kthread.c:376 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 --> 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 kswapd0/101: #0: ffffffff8c8e82a0 (fs_reclaim){+.+.}-{0:0}, at: set_task_reclaim_state mm/vmscan.c:200 [inline] #0: ffffffff8c8e82a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x170/0x1ac0 mm/vmscan.c:7338 #1: ffffffff8c89ef90 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:895 [inline] #1: ffffffff8c89ef90 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x660 mm/vmscan.c:1001 #2: ffff88801afc40e0 (&type->s_umount_key#32){++++}-{3:3}, at: trylock_super fs/super.c:414 [inline] #2: ffff88801afc40e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79 stack backtrace: CPU: 1 PID: 101 Comm: kswapd0 Not tainted 6.3.0-rc1-syzkaller-00274-g134231664868 #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:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x5b0 kernel/locking/lockdep.c:5634 start_this_handle+0xfe7/0x14e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x390/0x940 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x4fc/0x750 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:6110 __mark_inode_dirty+0x1e0/0x1030 fs/fs-writeback.c:2421 mark_inode_dirty_sync include/linux/fs.h:2132 [inline] iput.part.0+0x57/0x830 fs/inode.c:1771 iput+0x5c/0x80 fs/inode.c:1764 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+0x428/0xc00 mm/vmscan.c:853 shrink_slab_memcg mm/vmscan.c:922 [inline] shrink_slab+0x388/0x660 mm/vmscan.c:1001 shrink_one+0x502/0x810 mm/vmscan.c:5343 shrink_many mm/vmscan.c:5394 [inline] lru_gen_shrink_node mm/vmscan.c:5511 [inline] shrink_node+0x2064/0x35f0 mm/vmscan.c:6459 kswapd_shrink_node mm/vmscan.c:7262 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7452 kswapd+0x677/0xec0 mm/vmscan.c:7712 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308