====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc4-syzkaller-00161-g62bad54b26db #0 Not tainted ------------------------------------------------------ syz-executor.0/17859 is trying to acquire lock: ffffffff8c969aa8 (fscrypt_init_mutex){+.+.}-{3:3}, at: fscrypt_initialize+0x40/0xa0 fs/crypto/crypto.c:326 but task is already holding lock: ffff8880486da990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (jbd2_handle){++++}-{0:0}: 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_sample_last_mounted fs/ext4/file.c:851 [inline] ext4_file_open+0x618/0xbf0 fs/ext4/file.c:880 do_dentry_open+0x6cc/0x13f0 fs/open.c:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1477 [inline] sb_start_intwrite include/linux/fs.h:1599 [inline] ext4_evict_inode+0x114b/0x1ca0 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1748 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1774 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+0x428/0xaa0 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+0x677/0xd60 mm/vmscan.c:7712 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4717 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4731 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:728 [inline] slab_alloc_node mm/slab.c:3241 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3541 kmalloc_node_trace+0x21/0xd0 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_slow+0x24c/0x460 fs/namei.c:1686 lookup_one+0x173/0x1a0 fs/namei.c:2742 ovl_lookup_upper fs/overlayfs/overlayfs.h:344 [inline] ovl_workdir_create+0x1cd/0x900 fs/overlayfs/super.c:773 ovl_make_workdir fs/overlayfs/super.c:1294 [inline] ovl_get_workdir fs/overlayfs/super.c:1444 [inline] ovl_fill_super+0x1c8a/0x7270 fs/overlayfs/super.c:2000 mount_nodev+0x64/0x120 fs/super.c:1426 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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: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/0x520 kernel/locking/lockdep.c:5634 __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+0x1a6a/0x2790 fs/ext4/namei.c:3915 ext4_rename2+0x1c7/0x270 fs/ext4/namei.c:4200 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] __x64_sys_renameat2+0xe8/0x120 fs/namei.c:4953 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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 --> sb_internal --> jbd2_handle Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(jbd2_handle); lock(sb_internal); lock(jbd2_handle); lock(fscrypt_init_mutex); *** DEADLOCK *** 6 locks held by syz-executor.0/17859: #0: ffff8880486d6460 (sb_writers#5){.+.+}-{0:0}, at: do_renameat2+0x37f/0xc90 fs/namei.c:4859 #1: ffff8880486d6748 (&type->s_vfs_rename_key#2){+.+.}-{3:3}, at: lock_rename+0x58/0x280 fs/namei.c:2995 #2: ffff888028fcd780 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #2: ffff888028fcd780 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename+0xa4/0x280 fs/namei.c:2999 #3: ffff888028f815c0 (&type->i_mutex_dir_key#3/2){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #3: ffff888028f815c0 (&type->i_mutex_dir_key#3/2){+.+.}-{3:3}, at: lock_rename+0xd8/0x280 fs/namei.c:3000 #4: ffff888026555600 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #4: ffff888026555600 (&sb->s_type->i_mutex_key#7/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xd5/0x110 fs/inode.c:1124 #5: ffff8880486da990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 stack backtrace: CPU: 1 PID: 17859 Comm: syz-executor.0 Not tainted 6.3.0-rc4-syzkaller-00161-g62bad54b26db #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/0x520 kernel/locking/lockdep.c:5634 __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+0x1a6a/0x2790 fs/ext4/namei.c:3915 ext4_rename2+0x1c7/0x270 fs/ext4/namei.c:4200 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] __x64_sys_renameat2+0xe8/0x120 fs/namei.c:4953 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcc4d48c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fcc4e1ee168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007fcc4d5abf80 RCX: 00007fcc4d48c0f9 RDX: 0000000000000003 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007fcc4d4e7b39 R08: 0000000000000004 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3fdd7aaf R14: 00007fcc4e1ee300 R15: 0000000000022000