======================================================
WARNING: possible circular locking dependency detected
6.2.0-next-20230306 #1 Not tainted
------------------------------------------------------
syz-executor.4/16894 is trying to acquire lock:
ffff88800b550400 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_bmap+0x52/0x470
but task is already holding lock:
ffff88800ff6a3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x483/0xc90
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+0x149/0x1300
jbd2_journal_flush+0x19e/0xc90
__ext4_ioctl+0x9fd/0x4330
__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+0x133/0x14a0
jbd2_journal_lock_updates+0x162/0x310
ext4_change_inode_journal_flag+0x187/0x550
ext4_fileattr_set+0x14fa/0x19f0
vfs_fileattr_set+0x7a2/0xbd0
do_vfs_ioctl+0xfc1/0x1690
__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/0x840
ext4_fileattr_set+0x1521/0x19f0
vfs_fileattr_set+0x7a2/0xbd0
do_vfs_ioctl+0xfc1/0x1690
__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+0x2d56/0x6380
lock_acquire.part.0+0xea/0x320
down_read+0x3d/0x50
ext4_bmap+0x52/0x470
bmap+0xb0/0x130
jbd2_journal_bmap+0xac/0x1d0
jbd2_journal_flush+0x87f/0xc90
__ext4_ioctl+0x9fd/0x4330
__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.4/16894:
#0: ffff88800ff6a170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310
#1: ffff88800ff6a3f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x483/0xc90
stack backtrace:
CPU: 1 PID: 16894 Comm: syz-executor.4 Not tainted 6.2.0-next-20230306 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x91/0xf0
check_noncircular+0x263/0x2e0
__lock_acquire+0x2d56/0x6380
lock_acquire.part.0+0xea/0x320
down_read+0x3d/0x50
ext4_bmap+0x52/0x470
bmap+0xb0/0x130
jbd2_journal_bmap+0xac/0x1d0
jbd2_journal_flush+0x87f/0xc90
__ext4_ioctl+0x9fd/0x4330
__x64_sys_ioctl+0x19e/0x210
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f582ef53b19
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:00007f582c4c9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f582f066f60 RCX: 00007f582ef53b19
RDX: 0000000020000340 RSI: 000000004004662b RDI: 0000000000000005
RBP: 00007f582efadf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc1cc60c4f R14: 00007f582c4c9300 R15: 0000000000022000
</TASK>
audit: type=1326 audit(1678100578.035:20): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=16983 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0b8286b19 code=0x0
audit: type=1326 audit(1678100578.868:21): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=16983 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0b8286b19 code=0x0
audit: type=1326 audit(1678100579.032:22): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17020 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0b8286b19 code=0x0
audit: type=1326 audit(1678100579.125:23): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17029 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f1e9c6ceb19 code=0x0
cgroup: fork rejected by pids controller in /syz7
audit: type=1326 audit(1678100580.025:24): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17149 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0b8286b19 code=0x0
audit: type=1326 audit(1678100580.058:25): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17164 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f1e9c6ceb19 code=0x0
audit: type=1326 audit(1678100580.970:26): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17212 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa0b8286b19 code=0x0
audit: type=1326 audit(1678100580.977:27): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17214 comm="syz-executor.6" exe="/syz-executor.6" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f1e9c6ceb19 code=0x0
tmpfs: Unknown parameter 'mpol prefer:0'
tmpfs: Unknown parameter 'mpol prefer:0'
audit: type=1326 audit(1678100581.137:28): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17230 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f45cc272b19 code=0x0
tmpfs: Unknown parameter 'mpol prefer:0'
tmpfs: Unknown parameter 'mpol prefer:0'
audit: type=1326 audit(1678100581.966:29): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17230 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f45cc272b19 code=0x0
tmpfs: Unknown parameter 'mpol prefer:0'
tmpfs: Unknown parameter 'mpol prefer:0'
tmpfs: Unknown parameter 'mpol prefer:0'
tmpfs: Unknown parameter 'mpol prefer:0'
kauditd_printk_skb: 3 callbacks suppressed
audit: type=1326 audit(1678100583.070:33): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17306 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f48ea7bbb19 code=0x0
audit: type=1326 audit(1678100583.968:34): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17326 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f48ea7bbb19 code=0x0
audit: type=1326 audit(1678100583.988:35): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=17333 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f45cc272b19 code=0x0
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 228 bytes leftover after parsing attributes in process `syz-executor.3'.