------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0 Not tainted
------------------------------------------------------
kworker/1:7/5935 is trying to acquire lock:
ffffffff8e0c8800 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x9f/0xd0 kernel/printk/printk.c:1924

but task is already holding lock:
ffff8880b873dc58 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4144 [inline]
ffff8880b873dc58 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x14a/0xc30 kernel/workqueue.c:4195

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+0x26b/0x1080 kernel/workqueue.c:2299
       queue_work_on+0x11a/0x140 kernel/workqueue.c:2390
       queue_work include/linux/workqueue.h:662 [inline]
       rpm_suspend+0xe7e/0x1200 drivers/base/power/runtime.c:662
       rpm_idle+0x5c4/0x740 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:1048
       bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534
       device_add+0x114b/0x1a70 drivers/base/core.c:3665
       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:3370 [inline]
       serial_core_register_port+0x13d/0x2570 drivers/tty/serial/serial_core.c:3411
       serial8250_register_8250_port+0x14cd/0x21f0 drivers/tty/serial/8250/8250_core.c:820
       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:579 [inline]
       really_probe+0x241/0xa90 drivers/base/dd.c:658
       __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
       driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
       __driver_attach+0x283/0x580 drivers/base/dd.c:1216
       bus_for_each_dev+0x13f/0x1d0 drivers/base/bus.c:370
       bus_add_driver+0x2e9/0x690 drivers/base/bus.c:675
       driver_register+0x15c/0x4b0 drivers/base/driver.c:246
       serial8250_init+0xc9/0x1e0 drivers/tty/serial/8250/8250_platform.c:324
       do_one_initcall+0x12b/0x700 init/main.c:1266
       do_initcall_level init/main.c:1328 [inline]
       do_initcalls init/main.c:1344 [inline]
       do_basic_setup init/main.c:1363 [inline]
       kernel_init_freeable+0x5c7/0x900 init/main.c:1577
       kernel_init+0x1c/0x2b0 init/main.c:1466
       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){-...}-{3:3}:
       __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+0x218/0xb30 drivers/tty/serial/serial_core.c:635
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0x41c/0x1140 drivers/tty/n_tty.c:2389
       iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
       file_tty_write.constprop.0+0x509/0x9a0 drivers/tty/tty_io.c:1090
       tty_write drivers/tty/tty_io.c:1111 [inline]
       redirected_tty_write drivers/tty/tty_io.c:1134 [inline]
       redirected_tty_write+0xcc/0x140 drivers/tty/tty_io.c:1114
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0x5b1/0x1150 fs/read_write.c:679
       ksys_write+0x12b/0x250 fs/read_write.c:731
       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){-.-.}-{3:3}:
       __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:715 [inline]
       serial8250_console_write+0xb56/0x17c0 drivers/tty/serial/8250/8250_port.c:3371
       console_emit_next_record kernel/printk/printk.c:3122 [inline]
       console_flush_all+0x803/0xc60 kernel/printk/printk.c:3210
       __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
       console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
       vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
       _printk+0xc8/0x100 kernel/printk/printk.c:2457
       register_console+0xbfd/0x1170 kernel/printk/printk.c:4099
       univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:513
       console_init+0x154/0x690 kernel/printk/printk.c:4292
       start_kernel+0x29a/0x4d0 init/main.c:1037
       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:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
       console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
       console_emit_next_record kernel/printk/printk.c:3116 [inline]
       console_flush_all+0x7ac/0xc60 kernel/printk/printk.c:3210
       __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
       console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
       vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
       _printk+0xc8/0x100 kernel/printk/printk.c:2457
       __warn_printk+0x158/0x350 kernel/panic.c:794
       check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3704
       start_flush_work kernel/workqueue.c:4158 [inline]
       __flush_work+0x21e/0xc30 kernel/workqueue.c:4195
       hfs_file_fsync+0x101/0x190 fs/hfs/inode.c:680
       vfs_fsync_range+0x139/0x220 fs/sync.c:187
       generic_write_sync include/linux/fs.h:2904 [inline]
       dio_complete+0x719/0x8e0 fs/direct-io.c:313
       process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
       process_scheduled_works kernel/workqueue.c:3310 [inline]
       worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
       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/1:7/5935:
 #0: ffff88807cc34948 ((wq_completion)dio/loop3){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc900033c7d80 ((work_completion)(&dio->complete_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff888033d69620 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #2: ffff888033d69620 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: hfs_file_fsync+0x9d/0x190 fs/hfs/inode.c:673
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4137 [inline]
 #3: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x103/0xc30 kernel/workqueue.c:4195
 #4: ffff8880b873dc58 (&pool->lock){-.-.}-{2:2}, at: start_flush_work kernel/workqueue.c:4144 [inline]
 #4: ffff8880b873dc58 (&pool->lock){-.-.}-{2:2}, at: __flush_work+0x14a/0xc30 kernel/workqueue.c:4195
 #5: ffffffff8e1a8c40 (console_lock){+.+.}-{0:0}, at: vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
 #6: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
 #6: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:297 [inline]
 #6: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
 #6: ffffffff8e1a8cb0 (console_srcu){....}-{0:0}, at: console_flush_all+0x159/0xc60 kernel/printk/printk.c:3187

stack backtrace:
CPU: 1 UID: 0 PID: 5935 Comm: kworker/1:7 Not tainted 6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: dio/loop3 dio_aio_complete_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 console_lock_spinning_enable+0xb0/0xd0 kernel/printk/printk.c:1924
 console_emit_next_record kernel/printk/printk.c:3116 [inline]
 console_flush_all+0x7ac/0xc60 kernel/printk/printk.c:3210
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86
 _printk+0xc8/0x100 kernel/printk/printk.c:2457
 __warn_printk+0x158/0x350 kernel/panic.c:794
 check_flush_dependency+0x3a5/0x450 kernel/workqueue.c:3704
 start_flush_work kernel/workqueue.c:4158 [inline]
 __flush_work+0x21e/0xc30 kernel/workqueue.c:4195
 hfs_file_fsync+0x101/0x190 fs/hfs/inode.c:680
 vfs_fsync_range+0x139/0x220 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2904 [inline]
 dio_complete+0x719/0x8e0 fs/direct-io.c:313
 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 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: 5935 at kernel/workqueue.c:3704 check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3704
Modules linked in:
CPU: 1 UID: 0 PID: 5935 Comm: kworker/1:7 Not tainted 6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: dio/loop3 dio_aio_complete_work
RIP: 0010:check_flush_dependency+0x3a6/0x450 kernel/workqueue.c:3704
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 b2 00 00 00 49 8b 55 18 49 8d b6 78 01 00 00 4d 89 e0 48 c7 c7 00 ce 6b 8b e8 2b f1 f7 ff 90 <0f> 0b 90 90 e9 db fc ff ff e8 7c b6 99 00 e9 bb fc ff ff e8 72 b6
RSP: 0018:ffffc900033c7a18 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815a5159
RDX: ffff888020b29e00 RSI: ffffffff815a5166 RDI: 0000000000000001
RBP: ffff88801b079000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000033393554 R12: ffffffff8278ee10
R13: ffff88802a4fce00 R14: ffff88807cc34800 R15: ffff88801b091408
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc26356db30 CR3: 000000007b954000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 start_flush_work kernel/workqueue.c:4158 [inline]
 __flush_work+0x21e/0xc30 kernel/workqueue.c:4195
 hfs_file_fsync+0x101/0x190 fs/hfs/inode.c:680
 vfs_fsync_range+0x139/0x220 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2904 [inline]
 dio_complete+0x719/0x8e0 fs/direct-io.c:313
 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 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>