------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.14.0-next-20250404-syzkaller-14595-ga4cda136f021 #0 Not tainted
------------------------------------------------------
kworker/0:6/6180 is trying to acquire lock:
ffffffff8ec19f40 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2048 [inline]
ffffffff8ec19f40 (console_owner){....}-{0:0}, at: vprintk_emit+0x552/0xa40 kernel/printk/printk.c:2449

but task is already holding lock:
ffff8880b8639298 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4157 [inline]
ffff8880b8639298 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x1b0/0xc60 kernel/workqueue.c:4208

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&pool->lock){-.-.}-{2:2}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       __queue_work+0x785/0x10a0 kernel/workqueue.c:-1
       queue_work_on+0x1c4/0x380 kernel/workqueue.c:2392
       queue_work include/linux/workqueue.h:662 [inline]
       rpm_suspend+0xe9f/0x1750 drivers/base/power/runtime.c:673
       __pm_runtime_idle+0x131/0x1a0 drivers/base/power/runtime.c:1112
       pm_runtime_put include/linux/pm_runtime.h:466 [inline]
       __device_attach+0x3f5/0x530 drivers/base/dd.c:1048
       bus_probe_device+0x189/0x260 drivers/base/bus.c:537
       device_add+0x856/0xbf0 drivers/base/core.c:3666
       serial_base_port_add+0x2b6/0x3f0 drivers/tty/serial/serial_base_bus.c:179
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3342 [inline]
       serial_core_register_port+0x379/0x2820 drivers/tty/serial/serial_core.c:3381
       serial8250_register_8250_port+0x168e/0x1ff0 drivers/tty/serial/8250/8250_core.c:822
       serial_pnp_probe+0x626/0x990 drivers/tty/serial/8250/8250_pnp.c:480
       pnp_device_probe+0x2e0/0x490 drivers/pnp/driver.c:111
       call_driver_probe drivers/base/dd.c:-1 [inline]
       really_probe+0x2b9/0xad0 drivers/base/dd.c:658
       __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
       driver_probe_device+0x50/0x430 drivers/base/dd.c:830
       __driver_attach+0x45f/0x710 drivers/base/dd.c:1216
       bus_for_each_dev+0x23e/0x2b0 drivers/base/bus.c:370
       bus_add_driver+0x346/0x670 drivers/base/bus.c:678
       driver_register+0x23a/0x320 drivers/base/driver.c:249
       serial8250_init+0xc1/0x1c0 drivers/tty/serial/8250/8250_platform.c:315
       do_one_initcall+0x24a/0x940 init/main.c:1271
       do_initcall_level+0x157/0x210 init/main.c:1333
       do_initcalls+0x71/0xd0 init/main.c:1349
       kernel_init_freeable+0x432/0x5d0 init/main.c:1581
       kernel_init+0x1d/0x2b0 init/main.c:1471
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #2 (&dev->power.lock){-.-.}-{3:3}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
       __pm_runtime_resume+0x112/0x180 drivers/base/power/runtime.c:1179
       pm_runtime_get include/linux/pm_runtime.h:414 [inline]
       __uart_start+0x17c/0x450 drivers/tty/serial/serial_core.c:148
       uart_write+0x280/0xa40 drivers/tty/serial/serial_core.c:635
       process_output_block drivers/tty/n_tty.c:561 [inline]
       n_tty_write+0xd81/0x1270 drivers/tty/n_tty.c:2377
       iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
       file_tty_write+0x543/0x9d0 drivers/tty/tty_io.c:1090
       new_sync_write fs/read_write.c:591 [inline]
       vfs_write+0x70f/0xd10 fs/read_write.c:684
       ksys_write+0x19d/0x2d0 fs/read_write.c:736
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-.-.}-{3:3}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd8/0x130 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
       serial8250_console_write+0x1b0/0x1e00 drivers/tty/serial/8250/8250_port.c:3415
       console_emit_next_record kernel/printk/printk.c:3138 [inline]
       console_flush_all+0x86d/0xec0 kernel/printk/printk.c:3226
       __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
       console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
       vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
       _printk+0xd5/0x120 kernel/printk/printk.c:2475
       register_console+0xc7b/0x1080 kernel/printk/printk.c:4125
       univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
       console_init+0x1b8/0x6f0 kernel/printk/printk.c:4323
       start_kernel+0x2dd/0x510 init/main.c:1034
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
       x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:494
       common_startup_64+0x13e/0x147

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
       __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       console_trylock_spinning kernel/printk/printk.c:2048 [inline]
       vprintk_emit+0x56f/0xa40 kernel/printk/printk.c:2449
       _printk+0xd5/0x120 kernel/printk/printk.c:2475
       __warn_printk+0x240/0x360 kernel/panic.c:795
       check_flush_dependency+0x328/0x3c0 kernel/workqueue.c:3717
       start_flush_work kernel/workqueue.c:4171 [inline]
       __flush_work+0x28d/0xc60 kernel/workqueue.c:4208
       flush_work kernel/workqueue.c:4265 [inline]
       flush_delayed_work+0x16a/0x1c0 kernel/workqueue.c:4287
       hfs_file_fsync+0xea/0x140 fs/hfs/inode.c:680
       generic_write_sync include/linux/fs.h:2976 [inline]
       dio_complete+0x5a7/0x720 fs/direct-io.c:313
       process_one_work kernel/workqueue.c:3238 [inline]
       process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
       worker_thread+0x870/0xd50 kernel/workqueue.c:3400
       kthread+0x7b7/0x940 kernel/kthread.c:464
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

Chain exists of:
  console_owner --> &dev->power.lock --> &pool->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&pool->lock);
                               lock(&dev->power.lock);
                               lock(&pool->lock);
  lock(console_owner);

 *** DEADLOCK ***

5 locks held by kworker/0:6/6180:
 #0: ffff88807ac96d48 ((wq_completion)dio/loop0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88807ac96d48 ((wq_completion)dio/loop0){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
 #1: ffffc900033d7c60 ((work_completion)(&dio->complete_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc900033d7c60 ((work_completion)(&dio->complete_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
 #2: ffff88806e503d20 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #2: ffff88806e503d20 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: hfs_file_fsync+0x95/0x140 fs/hfs/inode.c:673
 #3: ffffffff8ed3e440 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8ed3e440 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #3: ffffffff8ed3e440 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4150 [inline]
 #3: ffffffff8ed3e440 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xee/0xc60 kernel/workqueue.c:4208
 #4: ffff8880b8639298 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4157 [inline]
 #4: ffff8880b8639298 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x1b0/0xc60 kernel/workqueue.c:4208

stack backtrace:
CPU: 0 UID: 0 PID: 6180 Comm: kworker/0:6 Not tainted 6.14.0-next-20250404-syzkaller-14595-ga4cda136f021 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: dio/loop0 dio_aio_complete_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079
 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 console_trylock_spinning kernel/printk/printk.c:2048 [inline]
 vprintk_emit+0x56f/0xa40 kernel/printk/printk.c:2449
 _printk+0xd5/0x120 kernel/printk/printk.c:2475
 __warn_printk+0x240/0x360 kernel/panic.c:795
 check_flush_dependency+0x328/0x3c0 kernel/workqueue.c:3717
 start_flush_work kernel/workqueue.c:4171 [inline]
 __flush_work+0x28d/0xc60 kernel/workqueue.c:4208
 flush_work kernel/workqueue.c:4265 [inline]
 flush_delayed_work+0x16a/0x1c0 kernel/workqueue.c:4287
 hfs_file_fsync+0xea/0x140 fs/hfs/inode.c:680
 generic_write_sync include/linux/fs.h:2976 [inline]
 dio_complete+0x5a7/0x720 fs/direct-io.c:313
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
workqueue: WQ_MEM_RECLAIM dio/loop0:dio_aio_complete_work is flushing !WQ_MEM_RECLAIM events_long:flush_mdb
WARNING: CPU: 0 PID: 6180 at kernel/workqueue.c:3721 check_flush_dependency+0x329/0x3c0 kernel/workqueue.c:3717
Modules linked in:
CPU: 0 UID: 0 PID: 6180 Comm: kworker/0:6 Not tainted 6.14.0-next-20250404-syzkaller-14595-ga4cda136f021 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: dio/loop0 dio_aio_complete_work
RIP: 0010:check_flush_dependency+0x329/0x3c0 kernel/workqueue.c:3717
Code: 08 4c 89 f7 e8 e8 11 a3 00 49 8b 16 49 81 c4 78 01 00 00 48 c7 c7 40 d6 49 8c 4c 89 ee 4c 89 e1 4c 8b 04 24 e8 b8 0f f8 ff 90 <0f> 0b 90 90 e9 4a ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 09
RSP: 0018:ffffc900033d77c0 EFLAGS: 00010046
RAX: 472edec907d43200 RBX: ffff88805e2e1408 RCX: ffff888035a1bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000008 R08: ffffffff81828012 R09: 1ffff110170c47d2
R10: dffffc0000000000 R11: ffffed10170c47d3 R12: ffff88801b081578
R13: ffff88807ac96d78 R14: ffff888024beea18 R15: ffff888024beea20
FS:  0000000000000000(0000) GS:ffff888124f8f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002a00a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 start_flush_work kernel/workqueue.c:4171 [inline]
 __flush_work+0x28d/0xc60 kernel/workqueue.c:4208
 flush_work kernel/workqueue.c:4265 [inline]
 flush_delayed_work+0x16a/0x1c0 kernel/workqueue.c:4287
 hfs_file_fsync+0xea/0x140 fs/hfs/inode.c:680
 generic_write_sync include/linux/fs.h:2976 [inline]
 dio_complete+0x5a7/0x720 fs/direct-io.c:313
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>