====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc3-syzkaller-00215-g0b3acd1cc022 #0 Not tainted ------------------------------------------------------ syz-executor.1/3708 is trying to acquire lock: ffffffff8c141968 (fscrypt_init_mutex){+.+.}-{3:3}, at: fscrypt_initialize+0x3c/0xa0 fs/crypto/crypto.c:324 but task is already holding lock: ffff888044666990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (jbd2_handle){++++}-{0:0}: 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 -> #1 (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/slab.c:3194 [inline] kmem_cache_alloc_node_trace+0x47/0x570 mm/slab.c:3601 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 __fscrypt_prepare_lookup+0x28/0xf0 fs/crypto/hooks.c:102 fscrypt_prepare_lookup include/linux/fscrypt.h:952 [inline] ext4_fname_prepare_lookup+0x1ba/0x200 fs/ext4/crypto.c:46 ext4_lookup_entry fs/ext4/namei.c:1740 [inline] ext4_lookup fs/ext4/namei.c:1815 [inline] ext4_lookup+0x12d/0x700 fs/ext4/namei.c:1806 __lookup_slow+0x24c/0x460 fs/namei.c:1685 lookup_slow fs/namei.c:1702 [inline] walk_component+0x33f/0x5a0 fs/namei.c:1993 lookup_last fs/namei.c:2450 [inline] path_lookupat+0x1ba/0x840 fs/namei.c:2474 filename_lookup+0x1ce/0x590 fs/namei.c:2503 user_path_at_empty+0x42/0x60 fs/namei.c:2876 user_path_at include/linux/namei.h:57 [inline] __do_sys_fspick fs/fsopen.c:181 [inline] __se_sys_fspick fs/fsopen.c:158 [inline] __x64_sys_fspick+0x180/0x380 fs/fsopen.c:158 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (fscrypt_init_mutex){+.+.}-{3:3}: 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 __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_find_entry fs/ext4/namei.c:1720 [inline] __ext4_unlink+0xa6/0x9d0 fs/ext4/namei.c:3202 ext4_unlink+0x5b0/0x9d0 fs/ext4/namei.c:3278 vfs_unlink+0x351/0x920 fs/namei.c:4229 do_unlinkat+0x3cc/0x650 fs/namei.c:4297 __do_sys_unlink fs/namei.c:4345 [inline] __se_sys_unlink fs/namei.c:4343 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4343 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: fscrypt_init_mutex --> fs_reclaim --> jbd2_handle Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(jbd2_handle); lock(fs_reclaim); lock(jbd2_handle); lock(fscrypt_init_mutex); *** DEADLOCK *** 4 locks held by syz-executor.1/3708: #0: ffff888044722460 (sb_writers#5){.+.+}-{0:0}, at: do_unlinkat+0x17f/0x650 fs/namei.c:4276 #1: ffff888028af6800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline] #1: ffff888028af6800 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x26c/0x650 fs/namei.c:4280 #2: ffff888028bea840 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #2: ffff888028bea840 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: vfs_unlink+0xd5/0x920 fs/namei.c:4218 #3: ffff888044666990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 stack backtrace: CPU: 1 PID: 3708 Comm: syz-executor.1 Not tainted 6.0.0-rc3-syzkaller-00215-g0b3acd1cc022 #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 __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_find_entry fs/ext4/namei.c:1720 [inline] __ext4_unlink+0xa6/0x9d0 fs/ext4/namei.c:3202 ext4_unlink+0x5b0/0x9d0 fs/ext4/namei.c:3278 vfs_unlink+0x351/0x920 fs/namei.c:4229 do_unlinkat+0x3cc/0x650 fs/namei.c:4297 __do_sys_unlink fs/namei.c:4345 [inline] __se_sys_unlink fs/namei.c:4343 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4343 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f199f088bb7 Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff999a9378 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f199f088bb7 RDX: 00007fff999a93b0 RSI: 00007fff999a93b0 RDI: 00007fff999a9440 RBP: 00007fff999a9440 R08: 0000000000000001 R09: 00007fff999a9210 R10: 00005555571b0893 R11: 0000000000000206 R12: 00007f199f0e242e R13: 00007fff999aa540 R14: 00005555571b0850 R15: 00007fff999ab640