warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
======================================================
WARNING: possible circular locking dependency detected
6.1.0-rc4-next-20221110 #1 Not tainted
------------------------------------------------------
syz-executor.1/13098 is trying to acquire lock:
ffff88800b160400 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_bmap+0x52/0x470

but task is already holding lock:
ffff88800fd2e3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48f/0xc10

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
       mutex_lock_io_nested+0x14c/0x1330
       jbd2_journal_flush+0x19e/0xc10
       __ext4_ioctl+0x9c1/0x4140
       __x64_sys_ioctl+0x19e/0x210
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

-> #2 (&journal->j_barrier){+.+.}-{3:3}:
       __mutex_lock+0x136/0x14e0
       jbd2_journal_lock_updates+0x162/0x310
       ext4_change_inode_journal_flag+0x183/0x540
       ext4_fileattr_set+0x142b/0x18c0
       vfs_fileattr_set+0x780/0xb90
       do_vfs_ioctl+0xfa6/0x15d0
       __x64_sys_ioctl+0x110/0x210
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

-> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}:
       percpu_down_write+0x51/0x350
       ext4_ind_migrate+0x23b/0x830
       ext4_fileattr_set+0x1452/0x18c0
       vfs_fileattr_set+0x780/0xb90
       do_vfs_ioctl+0xfa6/0x15d0
       __x64_sys_ioctl+0x110/0x210
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

-> #0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}:
       __lock_acquire+0x2a02/0x5e70
       lock_acquire+0x1a6/0x530
       down_read+0x9c/0x450
       ext4_bmap+0x52/0x470
       bmap+0xb0/0x130
       jbd2_journal_bmap+0xac/0x190
       jbd2_journal_flush+0x857/0xc10
       __ext4_ioctl+0x9c1/0x4140
       __x64_sys_ioctl+0x19e/0x210
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

other info that might help us debug this:

Chain exists of:
  &sb->s_type->i_mutex_key#6 --> &journal->j_barrier --> &journal->j_checkpoint_mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&journal->j_checkpoint_mutex);
                               lock(&journal->j_barrier);
                               lock(&journal->j_checkpoint_mutex);
  lock(&sb->s_type->i_mutex_key#6);

 *** DEADLOCK ***

2 locks held by syz-executor.1/13098:
 #0: ffff88800fd2e170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310
 #1: ffff88800fd2e3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48f/0xc10

stack backtrace:
CPU: 1 PID: 13098 Comm: syz-executor.1 Not tainted 6.1.0-rc4-next-20221110 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x8f/0xb7
 check_noncircular+0x263/0x2e0
 __lock_acquire+0x2a02/0x5e70
 lock_acquire+0x1a6/0x530
 down_read+0x9c/0x450
 ext4_bmap+0x52/0x470
 bmap+0xb0/0x130
 jbd2_journal_bmap+0xac/0x190
 jbd2_journal_flush+0x857/0xc10
 __ext4_ioctl+0x9c1/0x4140
 __x64_sys_ioctl+0x19e/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fdc94999b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdc91f0f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc94aacf60 RCX: 00007fdc94999b19
RDX: 0000000020000000 RSI: 000000004004662b RDI: 0000000000000003
RBP: 00007fdc949f3f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc6419aeaf R14: 00007fdc91f0f300 R15: 0000000000022000
 </TASK>
netlink: 36 bytes leftover after parsing attributes in process `syz-executor.6'.
warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow
tmpfs: Bad value for 'uid'
tmpfs: Bad value for 'uid'
tmpfs: Bad value for 'huge'
tmpfs: Bad value for 'huge'
Bluetooth: hci5: command 0x0406 tx timeout
hpet: Lost 1 RTC interrupts
EXT4-fs: Project quota feature not enabled. Cannot enable project quota enforcement.
EXT4-fs: Project quota feature not enabled. Cannot enable project quota enforcement.
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.