EXT4-fs error (device loop0): ext4_get_first_dir_block:3524: inode #12: comm syz-executor.0: directory missing '.' ===================================== WARNING: bad unlock balance detected! 6.3.0-rc2-syzkaller-00405-ga3671bd86a97 #0 Not tainted ------------------------------------- syz-executor.0/3236 is trying to release lock (&type->i_mutex_dir_key) at: [] inode_unlock include/linux/fs.h:763 [inline] [] ext4_rename fs/ext4/namei.c:4029 [inline] [] ext4_rename2+0x15a5/0x4440 fs/ext4/namei.c:4202 but there are no more locks to release! other info that might help us debug this: 2 locks held by syz-executor.0/3236: #0: ffff888087dce460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394 #1: ffff8880a1148400 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename+0x186/0x1a0 stack backtrace: CPU: 1 PID: 3236 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00405-ga3671bd86a97 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_unlock_imbalance_bug+0x252/0x2c0 kernel/locking/lockdep.c:5109 __lock_release kernel/locking/lockdep.c:5346 [inline] lock_release+0x59d/0x9d0 kernel/locking/lockdep.c:5689 up_write+0x79/0x580 kernel/locking/rwsem.c:1625 inode_unlock include/linux/fs.h:763 [inline] ext4_rename fs/ext4/namei.c:4029 [inline] ext4_rename2+0x15a5/0x4440 fs/ext4/namei.c:4202 vfs_rename+0xb1b/0xfa0 fs/namei.c:4772 do_renameat2+0xb9b/0x13c0 fs/namei.c:4923 __do_sys_renameat2 fs/namei.c:4956 [inline] __se_sys_renameat2 fs/namei.c:4953 [inline] __x64_sys_renameat2+0xd2/0xe0 fs/namei.c:4953 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ffb9f28c0f9 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:00007ffb9ff5f168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007ffb9f3abf80 RCX: 00007ffb9f28c0f9 RDX: 0000000000000004 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00007ffb9f2e7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbf75a6bf R14: 00007ffb9ff5f300 R15: 0000000000022000 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff8880a103f1e8, owner = 0x0, curr 0xffff888071748000, list empty WARNING: CPU: 1 PID: 3236 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline] WARNING: CPU: 1 PID: 3236 at kernel/locking/rwsem.c:1370 up_write+0x4f4/0x580 kernel/locking/rwsem.c:1626 Modules linked in: CPU: 1 PID: 3236 Comm: syz-executor.0 Not tainted 6.3.0-rc2-syzkaller-00405-ga3671bd86a97 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:__up_write kernel/locking/rwsem.c:1369 [inline] RIP: 0010:up_write+0x4f4/0x580 kernel/locking/rwsem.c:1626 Code: 48 c7 c7 a0 71 ea 8a 48 c7 c6 e0 73 ea 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 00 ef e8 ff 48 83 c4 08 <0f> 0b e9 75 fd ff ff 48 c7 c1 a8 b0 53 8e 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000b2f7680 EFLAGS: 00010292 RAX: 480864848b818300 RBX: ffffffff8aea7280 RCX: 0000000000040000 RDX: ffffc9000b3c1000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000b2f7750 R08: ffffffff81527d42 R09: fffff5200165ee89 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff8880a103f1e8 R14: 1ffff9200165eed8 R15: dffffc0000000000 FS: 00007ffb9ff5f700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32123000 CR3: 0000000027aa2000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inode_unlock include/linux/fs.h:763 [inline] ext4_rename fs/ext4/namei.c:4029 [inline] ext4_rename2+0x15a5/0x4440 fs/ext4/namei.c:4202 vfs_rename+0xb1b/0xfa0 fs/namei.c:4772 do_renameat2+0xb9b/0x13c0 fs/namei.c:4923 __do_sys_renameat2 fs/namei.c:4956 [inline] __se_sys_renameat2 fs/namei.c:4953 [inline] __x64_sys_renameat2+0xd2/0xe0 fs/namei.c:4953 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ffb9f28c0f9 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:00007ffb9ff5f168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007ffb9f3abf80 RCX: 00007ffb9f28c0f9 RDX: 0000000000000004 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00007ffb9f2e7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbf75a6bf R14: 00007ffb9ff5f300 R15: 0000000000022000