------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc3-syzkaller-00189-g00dcf5d862e8 #0 Not tainted
------------------------------------------------------
kworker/1:3/5248 is trying to acquire lock:
ffffffff8d6c1a80 (console_owner){..-.}-{0:0}, at: console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
ffffffff8d6c1a80 (console_owner){..-.}-{0:0}, at: console_emit_next_record kernel/printk/printk.c:2907 [inline]
ffffffff8d6c1a80 (console_owner){..-.}-{0:0}, at: console_flush_all+0x4ff/0xd70 kernel/printk/printk.c:2979

but task is already holding lock:
ffff88802c33d9d8 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4153 [inline]
ffff88802c33d9d8 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x160/0xb10 kernel/workqueue.c:4204

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&pool->lock){-.-.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       __queue_work+0x39e/0x1020 kernel/workqueue.c:2360
       queue_work_on+0xf4/0x120 kernel/workqueue.c:2435
       queue_work include/linux/workqueue.h:605 [inline]
       rpm_suspend+0xe69/0x1200 drivers/base/power/runtime.c:662
       rpm_idle+0x5bf/0x740 drivers/base/power/runtime.c:536
       __pm_runtime_idle+0xbc/0x160 drivers/base/power/runtime.c:1104
       pm_runtime_put include/linux/pm_runtime.h:448 [inline]
       __device_attach+0x382/0x4b0 drivers/base/dd.c:1046
       bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:532
       device_add+0x1188/0x1ab0 drivers/base/core.c:3720
       serial_base_port_add+0x357/0x4b0 drivers/tty/serial/serial_base_bus.c:178
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3365 [inline]
       serial_core_register_port+0x13d/0x1fa0 drivers/tty/serial/serial_core.c:3406
       serial8250_register_8250_port+0x1410/0x2090 drivers/tty/serial/8250/8250_core.c:1138
       serial_pnp_probe+0x47d/0x890 drivers/tty/serial/8250/8250_pnp.c:478
       pnp_device_probe+0x291/0x4b0 drivers/pnp/driver.c:111
       call_driver_probe drivers/base/dd.c:578 [inline]
       really_probe+0x23e/0xa90 drivers/base/dd.c:656
       __driver_probe_device+0x1de/0x440 drivers/base/dd.c:798
       driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:828
       __driver_attach+0x283/0x580 drivers/base/dd.c:1214
       bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:368
       bus_add_driver+0x2ed/0x640 drivers/base/bus.c:673
       driver_register+0x15c/0x4b0 drivers/base/driver.c:246
       serial8250_init+0xbe/0x4c0 drivers/tty/serial/8250/8250_core.c:1239
       do_one_initcall+0x128/0x630 init/main.c:1243
       do_initcall_level init/main.c:1305 [inline]
       do_initcalls init/main.c:1321 [inline]
       do_basic_setup init/main.c:1340 [inline]
       kernel_init_freeable+0x660/0xc50 init/main.c:1553
       kernel_init+0x1c/0x2b0 init/main.c:1442
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #2 (&dev->power.lock){-...}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       __pm_runtime_resume+0xa9/0x170 drivers/base/power/runtime.c:1171
       pm_runtime_get include/linux/pm_runtime.h:396 [inline]
       __uart_start+0x1b0/0x440 drivers/tty/serial/serial_core.c:148
       uart_write+0x2b5/0x540 drivers/tty/serial/serial_core.c:615
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2379
       iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
       file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096
       tty_write drivers/tty/tty_io.c:1117 [inline]
       redirected_tty_write drivers/tty/tty_io.c:1140 [inline]
       redirected_tty_write+0xaa/0xd0 drivers/tty/tty_io.c:1120
       call_write_iter include/linux/fs.h:2110 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0x6db/0x1100 fs/read_write.c:590
       ksys_write+0x12f/0x260 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:619 [inline]
       serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3355
       console_emit_next_record kernel/printk/printk.c:2913 [inline]
       console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2979
       console_unlock+0xae/0x290 kernel/printk/printk.c:3048
       vprintk_emit kernel/printk/printk.c:2348 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2373
       register_console+0xaa2/0x10a0 kernel/printk/printk.c:3569
       univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0xcc/0x680 kernel/printk/printk.c:3715
       start_kernel+0x259/0x490 init/main.c:1014
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #0 (console_owner){..-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
       console_emit_next_record kernel/printk/printk.c:2907 [inline]
       console_flush_all+0x514/0xd70 kernel/printk/printk.c:2979
       console_unlock+0xae/0x290 kernel/printk/printk.c:3048
       vprintk_emit kernel/printk/printk.c:2348 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2373
       __warn_printk+0x158/0x350 kernel/panic.c:738
       check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3728
       start_flush_work kernel/workqueue.c:4167 [inline]
       __flush_work+0x234/0xb10 kernel/workqueue.c:4204
       hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
       vfs_fsync_range+0x141/0x230 fs/sync.c:188
       generic_write_sync include/linux/fs.h:2795 [inline]
       dio_complete+0x728/0x8f0 fs/direct-io.c:314
       process_one_work+0x902/0x1a30 kernel/workqueue.c:3254
       process_scheduled_works kernel/workqueue.c:3335 [inline]
       worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
       kthread+0x2c1/0x3a0 kernel/kthread.c:388
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

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 ***

7 locks held by kworker/1:3/5248:
 #0: ffff88805bcb3148 ((wq_completion)dio/loop0){+.+.}-{0:0}, at: process_one_work+0x115f/0x1a30 kernel/workqueue.c:3229
 #1: ffffc90002ad7d80 ((work_completion)(&dio->complete_work)){+.+.}-{0:0}, at: process_one_work+0x865/0x1a30 kernel/workqueue.c:3230
 #2: ffff8880577a3028 (&sb->s_type->i_mutex_key#41){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline]
 #2: ffff8880577a3028 (&sb->s_type->i_mutex_key#41){+.+.}-{3:3}, at: hfs_file_fsync+0xa3/0x1a0 fs/hfs/inode.c:671
 #3: ffffffff8d7b44e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #3: ffffffff8d7b44e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #3: ffffffff8d7b44e0 (rcu_read_lock){....}-{1:2}, at: start_flush_work kernel/workqueue.c:4146 [inline]
 #3: ffffffff8d7b44e0 (rcu_read_lock){....}-{1:2}, at: __flush_work+0x119/0xb10 kernel/workqueue.c:4204
 #4: ffff88802c33d9d8 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4153 [inline]
 #4: ffff88802c33d9d8 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x160/0xb10 kernel/workqueue.c:4204
 #5: ffffffff8d7a1ec0 (console_lock){+.+.}-{0:0}, at: vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 #6: ffffffff8d7a1f30 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:334 [inline]
 #6: ffffffff8d7a1f30 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #6: ffffffff8d7a1f30 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #6: ffffffff8d7a1f30 (console_srcu){....}-{0:0}, at: console_flush_all+0x12d/0xd70 kernel/printk/printk.c:2971

stack backtrace:
CPU: 1 PID: 5248 Comm: kworker/1:3 Not tainted 6.9.0-rc3-syzkaller-00189-g00dcf5d862e8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: dio/loop0 dio_aio_complete_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
 console_emit_next_record kernel/printk/printk.c:2907 [inline]
 console_flush_all+0x514/0xd70 kernel/printk/printk.c:2979
 console_unlock+0xae/0x290 kernel/printk/printk.c:3048
 vprintk_emit kernel/printk/printk.c:2348 [inline]
 vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2373
 __warn_printk+0x158/0x350 kernel/panic.c:738
 check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3728
 start_flush_work kernel/workqueue.c:4167 [inline]
 __flush_work+0x234/0xb10 kernel/workqueue.c:4204
 hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
 vfs_fsync_range+0x141/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2795 [inline]
 dio_complete+0x728/0x8f0 fs/direct-io.c:314
 process_one_work+0x902/0x1a30 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
workqueue: WQ_MEM_RECLAIM dio/loop0:dio_aio_complete_work is flushing !WQ_MEM_RECLAIM events_long:flush_mdb
WARNING: CPU: 1 PID: 5248 at kernel/workqueue.c:3728 check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3728
Modules linked in:
CPU: 1 PID: 5248 Comm: kworker/1:3 Not tainted 6.9.0-rc3-syzkaller-00189-g00dcf5d862e8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: dio/loop0 dio_aio_complete_work
RIP: 0010:check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3728
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 b2 00 00 00 49 8b 55 18 49 8d b6 70 01 00 00 4d 89 e0 48 c7 c7 20 b4 0b 8b e8 7b 35 f8 ff 90 <0f> 0b 90 90 e9 db fc ff ff e8 0c dd 91 00 e9 bb fc ff ff e8 02 dd
RSP: 0018:ffffc90002ad7a28 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81512be9
RDX: ffff888023a32440 RSI: ffffffff81512bf6 RDI: 0000000000000001
RBP: ffff888014c89000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 7369786520656874 R12: ffffffff826ed170
R13: ffff888018c0fe00 R14: ffff88805bcb3000 R15: ffff888014ca3408
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000068154000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 start_flush_work kernel/workqueue.c:4167 [inline]
 __flush_work+0x234/0xb10 kernel/workqueue.c:4204
 hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
 vfs_fsync_range+0x141/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2795 [inline]
 dio_complete+0x728/0x8f0 fs/direct-io.c:314
 process_one_work+0x902/0x1a30 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>