------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Not tainted
------------------------------------------------------
kworker/1:1/45 is trying to acquire lock:
ffffffff8dac31a0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable kernel/printk/printk.c:1870 [inline]
ffffffff8dac31a0 (console_owner){-.-.}-{0:0}, at: console_emit_next_record kernel/printk/printk.c:2922 [inline]
ffffffff8dac31a0 (console_owner){-.-.}-{0:0}, at: console_flush_all+0x4ff/0xd70 kernel/printk/printk.c:2994

but task is already holding lock:
ffff8880b933db58 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4129 [inline]
ffff8880b933db58 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x14a/0xc60 kernel/workqueue.c:4181

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:2319
       queue_work_on+0x11a/0x140 kernel/workqueue.c:2410
       queue_work include/linux/workqueue.h:621 [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+0x114b/0x1a70 drivers/base/core.c:3721
       serial_base_port_add+0x357/0x4b0 drivers/tty/serial/serial_base_bus.c:179
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3380 [inline]
       serial_core_register_port+0x13d/0x2050 drivers/tty/serial/serial_core.c:3421
       serial8250_register_8250_port+0x1410/0x2090 drivers/tty/serial/8250/8250_core.c:1140
       serial_pnp_probe+0x44f/0x930 drivers/tty/serial/8250/8250_pnp.c:490
       pnp_device_probe+0x2a8/0x4d0 drivers/pnp/driver.c:111
       call_driver_probe drivers/base/dd.c:578 [inline]
       really_probe+0x241/0xa90 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+0x13f/0x1d0 drivers/base/bus.c:368
       bus_add_driver+0x2e9/0x690 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:1241
       do_one_initcall+0x12b/0x700 init/main.c:1267
       do_initcall_level init/main.c:1329 [inline]
       do_initcalls init/main.c:1345 [inline]
       do_basic_setup init/main.c:1364 [inline]
       kernel_init_freeable+0x69d/0xca0 init/main.c:1578
       kernel_init+0x1c/0x2b0 init/main.c:1467
       ret_from_fork+0x48/0x80 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+0x1b0/0x4c0 drivers/tty/serial/serial_core.c:148
       uart_write+0x191/0x3e0 drivers/tty/serial/serial_core.c:633
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0x426/0x1150 drivers/tty/n_tty.c:2379
       iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
       file_tty_write.constprop.0+0x51b/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+0xce/0x140 drivers/tty/tty_io.c:1120
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0x6b9/0x1140 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+0xcd/0x250 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:618 [inline]
       serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3352
       console_emit_next_record kernel/printk/printk.c:2928 [inline]
       console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2994
       console_unlock+0xae/0x290 kernel/printk/printk.c:3063
       vprintk_emit kernel/printk/printk.c:2345 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       register_console+0xa88/0x10a0 kernel/printk/printk.c:3596
       univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:719
       console_init+0xcc/0x680 kernel/printk/printk.c:3742
       start_kernel+0x295/0x4c0 init/main.c:1038
       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:1870 [inline]
       console_emit_next_record kernel/printk/printk.c:2922 [inline]
       console_flush_all+0x514/0xd70 kernel/printk/printk.c:2994
       console_unlock+0xae/0x290 kernel/printk/printk.c:3063
       vprintk_emit kernel/printk/printk.c:2345 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       __warn_printk+0x158/0x350 kernel/panic.c:737
       check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3706
       start_flush_work kernel/workqueue.c:4143 [inline]
       __flush_work+0x21e/0xc60 kernel/workqueue.c:4181
       hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
       vfs_fsync_range+0x144/0x230 fs/sync.c:188
       generic_write_sync include/linux/fs.h:2794 [inline]
       dio_complete+0x728/0x8f0 fs/direct-io.c:314
       process_one_work+0x9fe/0x1b60 kernel/workqueue.c:3231
       process_scheduled_works kernel/workqueue.c:3312 [inline]
       worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
       kthread+0x2c4/0x3a0 kernel/kthread.c:389
       ret_from_fork+0x48/0x80 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/1:1/45:
 #0: ffff88802e633d48 ((wq_completion)dio/loop3){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: ffffc90000b57d80 ((work_completion)(&dio->complete_work)){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: ffff88806529e428 (&sb->s_type->i_mutex_key#35){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
 #2: ffff88806529e428 (&sb->s_type->i_mutex_key#35){+.+.}-{3:3}, at: hfs_file_fsync+0xa3/0x1a0 fs/hfs/inode.c:671
 #3: ffffffff8dbb5be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #3: ffffffff8dbb5be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #3: ffffffff8dbb5be0 (rcu_read_lock){....}-{1:2}, at: start_flush_work kernel/workqueue.c:4122 [inline]
 #3: ffffffff8dbb5be0 (rcu_read_lock){....}-{1:2}, at: __flush_work+0x103/0xc60 kernel/workqueue.c:4181
 #4: ffff8880b933db58 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4129 [inline]
 #4: ffff8880b933db58 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x14a/0xc60 kernel/workqueue.c:4181
 #5: ffffffff8dba35e0 (console_lock){+.+.}-{0:0}, at: vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 #6: ffffffff8dba3650 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:334 [inline]
 #6: ffffffff8dba3650 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #6: ffffffff8dba3650 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #6: ffffffff8dba3650 (console_srcu){....}-{0:0}, at: console_flush_all+0x12d/0xd70 kernel/printk/printk.c:2986

stack backtrace:
CPU: 1 PID: 45 Comm: kworker/1:1 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: dio/loop3 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:1870 [inline]
 console_emit_next_record kernel/printk/printk.c:2922 [inline]
 console_flush_all+0x514/0xd70 kernel/printk/printk.c:2994
 console_unlock+0xae/0x290 kernel/printk/printk.c:3063
 vprintk_emit kernel/printk/printk.c:2345 [inline]
 vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2370
 __warn_printk+0x158/0x350 kernel/panic.c:737
 check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3706
 start_flush_work kernel/workqueue.c:4143 [inline]
 __flush_work+0x21e/0xc60 kernel/workqueue.c:4181
 hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
 vfs_fsync_range+0x144/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 dio_complete+0x728/0x8f0 fs/direct-io.c:314
 process_one_work+0x9fe/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 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/loop3:dio_aio_complete_work is flushing !WQ_MEM_RECLAIM events_long:flush_mdb
WARNING: CPU: 1 PID: 45 at kernel/workqueue.c:3706 check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3706
Modules linked in:
CPU: 1 PID: 45 Comm: kworker/1:1 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: dio/loop3 dio_aio_complete_work
RIP: 0010:check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3706
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 a0 ba 2b 8b e8 4b 2b f8 ff 90 <0f> 0b 90 90 e9 db fc ff ff e8 cc 8f 92 00 e9 bb fc ff ff e8 c2 8f
RSP: 0018:ffffc90000b57a18 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81514a39
RDX: ffff88801be85a00 RSI: ffffffff81514a46 RDI: 0000000000000001
RBP: ffff888015479000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 6f72665f74657220 R12: ffffffff82709d10
R13: ffff88801aebf300 R14: ffff88802e633c00 R15: ffff888015491408
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007e53a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 start_flush_work kernel/workqueue.c:4143 [inline]
 __flush_work+0x21e/0xc60 kernel/workqueue.c:4181
 hfs_file_fsync+0x107/0x1a0 fs/hfs/inode.c:678
 vfs_fsync_range+0x144/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 dio_complete+0x728/0x8f0 fs/direct-io.c:314
 process_one_work+0x9fe/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>