syzbot

======================================================
WARNING: possible circular locking dependency detected
6.2.0-syzkaller-12944-ge492250d5252 #0 Not tainted
------------------------------------------------------
syz-executor653/5064 is trying to acquire lock:
ffff88814b4ea990 (jbd2_handle){++++}-{0:0}, at: jbd2_log_wait_commit+0x153/0x4a0 fs/jbd2/journal.c:692

but task is already holding lock:
ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: ext4_rename fs/ext4/namei.c:3879 [inline]
ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: ext4_rename2+0x2633/0x4410 fs/ext4/namei.c:4193

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}:
       lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
       down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1689
       inode_lock_nested include/linux/fs.h:793 [inline]
       ext4_rename fs/ext4/namei.c:3879 [inline]
       ext4_rename2+0x2633/0x4410 fs/ext4/namei.c:4193
       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

-> #0 (jbd2_handle){++++}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
       lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
       jbd2_log_wait_commit+0x173/0x4a0 fs/jbd2/journal.c:692
       jbd2_journal_stop+0x95b/0xf50 fs/jbd2/transaction.c:1959
       __ext4_journal_stop+0xfc/0x1a0 fs/ext4/ext4_jbd2.c:133
       ext4_rename fs/ext4/namei.c:4011 [inline]
       ext4_rename2+0x3c93/0x4410 fs/ext4/namei.c:4193
       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

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&type->i_mutex_dir_key#3/4);
                               lock(jbd2_handle);
                               lock(&type->i_mutex_dir_key#3/4);
  lock(jbd2_handle);

 *** DEADLOCK ***

5 locks held by syz-executor653/5064:
 #0: ffff88814b4e6460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff88814b4e6748 (&type->s_vfs_rename_key){+.+.}-{3:3}, at: lock_rename+0x58/0x1a0 fs/namei.c:2995
 #2: ffff888074198400 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename+0x13e/0x1a0
 #3: ffff888074199810 (&type->i_mutex_dir_key#3/2){+.+.}-{3:3}, at: lock_rename+0x172/0x1a0
 #4: ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
 #4: ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: ext4_rename fs/ext4/namei.c:3879 [inline]
 #4: ffff88807419a218 (&type->i_mutex_dir_key#3/4){+.+.}-{3:3}, at: ext4_rename2+0x2633/0x4410 fs/ext4/namei.c:4193

stack backtrace:
CPU: 0 PID: 5064 Comm: syz-executor653 Not tainted 6.2.0-syzkaller-12944-ge492250d5252 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 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+0x166b/0x58e0 kernel/locking/lockdep.c:3832
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
 lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
 jbd2_log_wait_commit+0x173/0x4a0 fs/jbd2/journal.c:692
 jbd2_journal_stop+0x95b/0xf50 fs/jbd2/transaction.c:1959
 __ext4_journal_stop+0xfc/0x1a0 fs/ext4/ext4_jbd2.c:133
 ext4_rename fs/ext4/namei.c:4011 [inline]
 ext4_rename2+0x3c93/0x4410 fs/ext4/namei.c:4193
 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: 0033:0x7f84b22acff9
Code: ae 01 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 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:00007fff86cdc2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f84b22acff9
RDX: 0000000000000004 RSI: 00000000200