====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc4-next-20221108 #1 Not tainted ------------------------------------------------------ syz-executor.1/1389 is trying to acquire lock: ffff88800fb423f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x238/0x460 but task is already holding lock: ffff88803abee760 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: 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 -> #0 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a6/0x530 mutex_lock_io_nested+0x14c/0x1330 __jbd2_log_wait_for_space+0x238/0x460 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3ac/0x14c0 jbd2__journal_start+0x394/0x8d0 __ext4_journal_start_sb+0x395/0x470 ext4_unlink+0x4e8/0x8c0 vfs_unlink+0x35e/0x930 do_unlinkat+0x398/0x620 __x64_sys_unlink+0xca/0x110 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#6); lock(&journal->j_checkpoint_mutex); lock(&sb->s_type->i_mutex_key#6); lock(&journal->j_checkpoint_mutex); *** DEADLOCK *** 3 locks held by syz-executor.1/1389: #0: ffff88800fc6e438 (sb_writers#3){.+.+}-{0:0}, at: do_unlinkat+0x187/0x620 #1: ffff88803a045d70 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x274/0x620 #2: ffff88803abee760 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_unlink+0xd9/0x930 stack backtrace: CPU: 0 PID: 1389 Comm: syz-executor.1 Not tainted 6.1.0-rc4-next-20221108 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x8f/0xb7 check_noncircular+0x263/0x2e0 __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a6/0x530 mutex_lock_io_nested+0x14c/0x1330 __jbd2_log_wait_for_space+0x238/0x460 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3ac/0x14c0 jbd2__journal_start+0x394/0x8d0 __ext4_journal_start_sb+0x395/0x470 ext4_unlink+0x4e8/0x8c0 vfs_unlink+0x35e/0x930 do_unlinkat+0x398/0x620 __x64_sys_unlink+0xca/0x110 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f7d152bb457 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffc88774548 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7d152bb457 RDX: 00007ffc88774580 RSI: 00007ffc88774580 RDI: 00007ffc88774610 RBP: 00007ffc88774610 R08: 0000000000000001 R09: 00007ffc887743e0 R10: 000055555617dcfb R11: 0000000000000206 R12: 00007f7d15315105 R13: 00007ffc887756d0 R14: 000055555617dc20 R15: 00007ffc88775710 kernel write not supported for file [eventfd] (pid: 5454 comm: kworker/0:3) kernel write not supported for file [eventfd] (pid: 5454 comm: kworker/0:3) audit: type=1326 audit(1667904988.681:60): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48471 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f451632cb19 code=0x0 audit: type=1326 audit(1667904989.506:61): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48471 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f451632cb19 code=0x0 audit: type=1326 audit(1667904989.631:62): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48521 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f08e3b61b19 code=0x0 audit: type=1326 audit(1667904989.686:63): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48527 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f451632cb19 code=0x0 audit: type=1326 audit(1667904990.631:64): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48558 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f08e3b61b19 code=0x0 audit: type=1326 audit(1667904990.667:65): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48560 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f451632cb19 code=0x0 nfs: Unknown parameter 'ntext' nfs: Unknown parameter 'ntext' nfs: Unknown parameter 'ntext' audit: type=1326 audit(1667904991.600:66): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48589 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f451632cb19 code=0x0 audit: type=1326 audit(1667904991.606:67): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=48590 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f08e3b61b19 code=0x0 nfs: Unknown parameter 'ntext' nfs: Unknown parameter 'ntext' sit: Src spoofed 0.0.0.156/2002:0:29c:0:9cdf:3f09:: -> 172.20.20.170/5171::2200 sit: Src spoofed 0.0.0.156/2002:0:29c:0:9cdf:3f09:: -> 172.20.20.170/5171::2200 sit: Src spoofed 0.0.0.156/2002:0:29c:0:9cdf:3f09:: -> 172.20.20.170/5171::2200 sit: Src spoofed 0.0.0.156/2002:0:29c:0:9cdf:3f09:: -> 172.20.20.170/5171::2200 sit: Src spoofed 0.0.0.156/2002:0:29c:0:9cdf:3f09:: -> 172.20.20.170/5171::2200