EXT4-fs error (device loop4): ext4_get_first_dir_block:3524: inode #12: comm syz-executor.4: directory missing '.' ===================================== WARNING: bad unlock balance detected! 6.1.20-syzkaller #0 Not tainted ------------------------------------- syz-executor.4/32520 is trying to release lock (&type->i_mutex_dir_key) at: [] inode_unlock include/linux/fs.h:761 [inline] [] ext4_rename fs/ext4/namei.c:4029 [inline] [] ext4_rename2+0x3dfc/0x4450 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.4/32520: #0: ffff8880759da460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393 #1: ffff88809a614a38 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename+0x182/0x1a0 stack backtrace: CPU: 1 PID: 32520 Comm: syz-executor.4 Not tainted 6.1.20-syzkaller #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+0x1e3/0x2cb lib/dump_stack.c:106 print_unlock_imbalance_bug+0x24e/0x2c0 kernel/locking/lockdep.c:5109 __lock_release kernel/locking/lockdep.c:5346 [inline] lock_release+0x638/0xab0 kernel/locking/lockdep.c:5689 up_write+0x75/0x580 kernel/locking/rwsem.c:1625 inode_unlock include/linux/fs.h:761 [inline] ext4_rename fs/ext4/namei.c:4029 [inline] ext4_rename2+0x3dfc/0x4450 fs/ext4/namei.c:4202 vfs_rename+0xd8f/0x1190 fs/namei.c:4779 do_renameat2+0xb97/0x13b0 fs/namei.c:4930 __do_sys_renameat2 fs/namei.c:4963 [inline] __se_sys_renameat2 fs/namei.c:4960 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4960 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f43f9e8c0f9 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:00007f43faba8168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f43f9fabf80 RCX: 00007f43f9e8c0f9 RDX: 0000000000000004 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00007f43f9ee7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe0bf9758f R14: 00007f43faba8300 R15: 0000000000022000 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888097a253d0, owner = 0x0, curr 0xffff888018233a80, list empty WARNING: CPU: 0 PID: 32520 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline] WARNING: CPU: 0 PID: 32520 at kernel/locking/rwsem.c:1372 up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626 Modules linked in: CPU: 0 PID: 32520 Comm: syz-executor.4 Not tainted 6.1.20-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:__up_write kernel/locking/rwsem.c:1371 [inline] RIP: 0010:up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626 Code: 48 c7 c7 00 c6 eb 8a 48 c7 c6 a0 c8 eb 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 ef f9 e8 ff 48 83 c4 08 <0f> 0b e9 71 fd ff ff 48 c7 c1 28 22 53 8e 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc900146e7660 EFLAGS: 00010296 RAX: a5224be75a667000 RBX: ffffffff8aebc6e0 RCX: 0000000000040000 RDX: ffffc90006f7b000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900146e7730 R08: ffffffff8152ac2e R09: fffff520028dce85 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff888097a253d0 R14: 1ffff920028dced4 R15: dffffc0000000000 FS: 00007f43faba8700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f43f9fa8000 CR3: 000000001cdc4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inode_unlock include/linux/fs.h:761 [inline] ext4_rename fs/ext4/namei.c:4029 [inline] ext4_rename2+0x3dfc/0x4450 fs/ext4/namei.c:4202 vfs_rename+0xd8f/0x1190 fs/namei.c:4779 do_renameat2+0xb97/0x13b0 fs/namei.c:4930 __do_sys_renameat2 fs/namei.c:4963 [inline] __se_sys_renameat2 fs/namei.c:4960 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:4960 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f43f9e8c0f9 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:00007f43faba8168 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007f43f9fabf80 RCX: 00007f43f9e8c0f9 RDX: 0000000000000004 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00007f43f9ee7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe0bf9758f R14: 00007f43faba8300 R15: 0000000000022000