====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc6-syzkaller-00021-gcf1182944c7c #0 Not tainted ------------------------------------------------------ kswapd0/109 is trying to acquire lock: ffff888023ffa950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x10dd/0x15e0 fs/jbd2/transaction.c:463 but task is already holding lock: ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6771 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:3692 [inline] fs_reclaim_acquire+0x104/0x150 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3761 [inline] slab_alloc_node mm/slub.c:3842 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0xb5/0x440 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] setup_v1_file_key_derived fs/crypto/keysetup_v1.c:278 [inline] fscrypt_setup_v1_file_key+0x167/0x550 fs/crypto/keysetup_v1.c:299 fscrypt_setup_v1_file_key_via_subscribed_keyrings+0x159/0x2e0 fs/crypto/keysetup_v1.c:321 setup_file_encryption_key fs/crypto/keysetup.c:485 [inline] fscrypt_setup_encryption_info+0xb6d/0x1080 fs/crypto/keysetup.c:590 fscrypt_get_encryption_info+0x3d7/0x4b0 fs/crypto/keysetup.c:675 fscrypt_setup_filename+0x238/0xd80 fs/crypto/fname.c:458 __fscrypt_prepare_lookup+0x2c/0xf0 fs/crypto/hooks.c:100 fscrypt_prepare_lookup include/linux/fscrypt.h:979 [inline] ext4_fname_prepare_lookup+0x1e0/0x350 fs/ext4/crypto.c:48 ext4_lookup_entry fs/ext4/namei.c:1764 [inline] ext4_lookup+0x14b/0x740 fs/ext4/namei.c:1839 lookup_one_qstr_excl+0x11d/0x190 fs/namei.c:1608 filename_create+0x1ed/0x530 fs/namei.c:3896 do_symlinkat+0xbf/0x310 fs/namei.c:4503 __do_sys_symlinkat fs/namei.c:4526 [inline] __se_sys_symlinkat fs/namei.c:4523 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4523 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #1 (&type->lock_class#2){++++}-{3:3}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 find_and_lock_process_key+0x97/0x390 fs/crypto/keysetup_v1.c:112 fscrypt_setup_v1_file_key_via_subscribed_keyrings+0x115/0x2e0 fs/crypto/keysetup_v1.c:310 setup_file_encryption_key fs/crypto/keysetup.c:485 [inline] fscrypt_setup_encryption_info+0xb6d/0x1080 fs/crypto/keysetup.c:590 fscrypt_get_encryption_info+0x3d7/0x4b0 fs/crypto/keysetup.c:675 fscrypt_setup_filename+0x238/0xd80 fs/crypto/fname.c:458 ext4_fname_setup_filename+0xa3/0x260 fs/ext4/crypto.c:28 ext4_add_entry+0x2e3/0xdf0 fs/ext4/namei.c:2401 ext4_rename+0x16a9/0x28a0 fs/ext4/namei.c:3937 ext4_rename2+0x1bc/0x270 fs/ext4/namei.c:4215 vfs_rename+0xf87/0x20b0 fs/namei.c:4883 do_renameat2+0xc54/0xdc0 fs/namei.c:5040 __do_sys_renameat fs/namei.c:5081 [inline] __se_sys_renameat fs/namei.c:5078 [inline] __x64_sys_renameat+0xc6/0x100 fs/namei.c:5078 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #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:3869 [inline] __lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 start_this_handle+0x1103/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x395/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x347/0x5e0 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:5939 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2452 mark_inode_dirty_sync include/linux/fs.h:2387 [inline] iput.part.0+0x5b/0x7b0 fs/inode.c:1762 iput+0x5c/0x80 fs/inode.c:1755 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x426/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7b0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x214d/0x3750 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6693 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883 kswapd+0x5be/0xc00 mm/vmscan.c:7143 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 other info that might help us debug this: Chain exists of: jbd2_handle --> &type->lock_class#2 --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&type->lock_class#2); lock(fs_reclaim); rlock(jbd2_handle); *** DEADLOCK *** 2 locks held by kswapd0/109: #0: ffffffff8d91e080 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6771 #1: ffff888023f960e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline] #1: ffff888023f960e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196 stack backtrace: CPU: 2 PID: 109 Comm: kswapd0 Not tainted 6.8.0-rc6-syzkaller-00021-gcf1182944c7c #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+0x31b/0x400 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:3869 [inline] __lock_acquire+0x244f/0x3b40 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 start_this_handle+0x1103/0x15e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x395/0x850 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x347/0x5e0 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:5939 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2452 mark_inode_dirty_sync include/linux/fs.h:2387 [inline] iput.part.0+0x5b/0x7b0 fs/inode.c:1762 iput+0x5c/0x80 fs/inode.c:1755 dentry_unlink_inode+0x295/0x440 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x426/0x1120 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7b0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x214d/0x3750 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6693 [inline] balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883 kswapd+0x5be/0xc00 mm/vmscan.c:7143 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243