------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.524/7556 is trying to acquire lock:
ffffffff8e0cf5c0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1897

but task is already holding lock:
ffff88801b0a8018 (&pool->lock){-.-.}-{2:2}, at: destroy_workqueue+0x1d9/0xaa0 kernel/workqueue.c:5924

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/0x1160 kernel/workqueue.c:2301
       queue_work_on+0x15f/0x1f0 kernel/workqueue.c:2392
       queue_work include/linux/workqueue.h:669 [inline]
       rpm_suspend+0xeba/0x11d0 drivers/base/power/runtime.c:685
       rpm_idle+0x5b4/0x730 drivers/base/power/runtime.c:559
       __pm_runtime_idle+0xba/0x1a0 drivers/base/power/runtime.c:1124
       pm_runtime_put include/linux/pm_runtime.h:555 [inline]
       __device_attach+0x37e/0x4b0 drivers/base/dd.c:1049
       bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
       device_add+0x1148/0x1aa0 drivers/base/core.c:3689
       serial_base_port_add+0x362/0x4c0 drivers/tty/serial/serial_base_bus.c:183
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3284 [inline]
       serial_core_register_port+0x13c/0x25d0 drivers/tty/serial/serial_core.c:3323
       serial8250_register_8250_port+0x15a3/0x23e0 drivers/tty/serial/8250/8250_core.c:818
       serial_pnp_probe+0x431/0x910 drivers/tty/serial/8250/8250_pnp.c:480
       pnp_device_probe+0x2a5/0x4d0 drivers/pnp/driver.c:111
       call_driver_probe drivers/base/dd.c:581 [inline]
       really_probe+0x23e/0xa90 drivers/base/dd.c:659
       __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801
       driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
       __driver_attach+0x283/0x580 drivers/base/dd.c:1217
       bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:370
       bus_add_driver+0x2e9/0x690 drivers/base/bus.c:678
       driver_register+0x15c/0x4b0 drivers/base/driver.c:249
       serial8250_init+0xc9/0x1e0 drivers/tty/serial/8250/8250_platform.c:320
       do_one_initcall+0x120/0x6e0 init/main.c:1283
       do_initcall_level init/main.c:1345 [inline]
       do_initcalls init/main.c:1361 [inline]
       do_basic_setup init/main.c:1380 [inline]
       kernel_init_freeable+0x5c2/0x910 init/main.c:1593
       kernel_init+0x1c/0x2b0 init/main.c:1483
       ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #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:1191
       pm_runtime_get include/linux/pm_runtime.h:492 [inline]
       __uart_start+0x1b0/0x500 drivers/tty/serial/serial_core.c:149
       uart_write+0x218/0xb30 drivers/tty/serial/serial_core.c:633
       process_output_block drivers/tty/n_tty.c:561 [inline]
       n_tty_write+0x41e/0x11e0 drivers/tty/n_tty.c:2377
       iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
       file_tty_write.constprop.0+0x500/0x9b0 drivers/tty/tty_io.c:1081
       tty_write drivers/tty/tty_io.c:1102 [inline]
       redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
       redirected_tty_write+0xd4/0x150 drivers/tty/tty_io.c:1105
       new_sync_write fs/read_write.c:593 [inline]
       vfs_write+0x7d0/0x11d0 fs/read_write.c:686
       ksys_write+0x12a/0x250 fs/read_write.c:738
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
       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:717 [inline]
       serial8250_console_write+0x181/0x1890 drivers/tty/serial/8250/8250_port.c:3301
       console_emit_next_record kernel/printk/printk.c:3111 [inline]
       console_flush_all+0x801/0xc60 kernel/printk/printk.c:3199
       __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
       console_unlock+0xd8/0x210 kernel/printk/printk.c:3298
       vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423
       _printk+0xc7/0x100 kernel/printk/printk.c:2448
       register_console+0xc2d/0x11b0 kernel/printk/printk.c:4099
       univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:511
       console_init+0x14f/0x680 kernel/printk/printk.c:4298
       start_kernel+0x29f/0x4e0 init/main.c:1048
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
       console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1897
       console_emit_next_record kernel/printk/printk.c:3105 [inline]
       console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3199
       __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
       console_unlock+0xd8/0x210 kernel/printk/printk.c:3298
       vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423
       _printk+0xc7/0x100 kernel/printk/printk.c:2448
       __report_bug lib/bug.c:191 [inline]
       report_bug+0x435/0x580 lib/bug.c:215
       handle_bug+0x184/0x210 arch/x86/kernel/traps.c:338
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:392
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       destroy_workqueue+0x319/0xaa0 kernel/workqueue.c:5925
       nci_unregister_device+0x68/0x300 net/nfc/nci/core.c:1314
       virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:172
       __fput+0x402/0xb70 fs/file_table.c:468
       task_work_run+0x150/0x240 kernel/task_work.c:227
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
       exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
       syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
       do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

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 syz.3.524/7556:
 #0: ffffffff8e078288 (wq_pool_mutex){+.+.}-{4:4}, at: destroy_workqueue+0x16f/0xaa0 kernel/workqueue.c:5921
 #1: ffff88802c02b888 (&wq->mutex){+.+.}-{4:4}, at: destroy_workqueue+0x17a/0xaa0 kernel/workqueue.c:5922
 #2: ffff88801b0a8018 (&pool->lock){-.-.}-{2:2}, at: destroy_workqueue+0x1d9/0xaa0 kernel/workqueue.c:5924
 #3: ffffffff8e1afa00 (console_lock){+.+.}-{0:0}, at: _printk+0xc7/0x100 kernel/printk/printk.c:2448
 #4: ffffffff8e1afa70 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:336 [inline]
 #4: ffffffff8e1afa70 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:335 [inline]
 #4: ffffffff8e1afa70 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:289 [inline]
 #4: ffffffff8e1afa70 (console_srcu){....}-{0:0}, at: console_flush_all+0x158/0xc60 kernel/printk/printk.c:3176

stack backtrace:
CPU: 0 UID: 0 PID: 7556 Comm: syz.3.524 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2043
 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x12a6/0x1ce0 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1897
 console_emit_next_record kernel/printk/printk.c:3105 [inline]
 console_flush_all+0x7aa/0xc60 kernel/printk/printk.c:3199
 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
 console_unlock+0xd8/0x210 kernel/printk/printk.c:3298
 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423
 _printk+0xc7/0x100 kernel/printk/printk.c:2448
 __report_bug lib/bug.c:191 [inline]
 report_bug+0x435/0x580 lib/bug.c:215
 handle_bug+0x184/0x210 arch/x86/kernel/traps.c:338
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:392
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:destroy_workqueue+0x319/0xaa0 kernel/workqueue.c:5925
Code: e8 1c ee 37 00 49 8d 6d 68 48 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 2d 06 00 00 49 8b 45 68 48 39 c5 74 7f e8 f8 ed 37 00 90 <0f> 0b 90 48 c7 c6 60 18 6c 8b 48 8d 93 78 01 00 00 48 c7 c7 80 0d
RSP: 0018:ffffc90006d9fd48 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88802c02b800 RCX: ffffffff8183243a
RDX: ffff88805442c900 RSI: ffffffff81832538 RDI: 0000000000000005
RBP: ffff88802a3ef024 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002
R13: ffff88802a3ef000 R14: dffffc0000000000 R15: 0000000000000001
 nci_unregister_device+0x68/0x300 net/nfc/nci/core.c:1314
 virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:172
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f541558eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff9bed4df8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f54157e7da0 RCX: 00007f541558eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f54157e7da0 R08: 00000000000007ec R09: 0000000d9bed50ef
R10: 00000000003ff5f0 R11: 0000000000000246 R12: 0000000000015419
R13: 00007f54157e6090 R14: ffffffffffffffff R15: 00007fff9bed4f10
 </TASK>
WARNING: CPU: 0 PID: 7556 at kernel/workqueue.c:5925 destroy_workqueue+0x319/0xaa0 kernel/workqueue.c:5925
Modules linked in:
CPU: 0 UID: 0 PID: 7556 Comm: syz.3.524 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:destroy_workqueue+0x319/0xaa0 kernel/workqueue.c:5925
Code: e8 1c ee 37 00 49 8d 6d 68 48 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 2d 06 00 00 49 8b 45 68 48 39 c5 74 7f e8 f8 ed 37 00 90 <0f> 0b 90 48 c7 c6 60 18 6c 8b 48 8d 93 78 01 00 00 48 c7 c7 80 0d
RSP: 0018:ffffc90006d9fd48 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88802c02b800 RCX: ffffffff8183243a
RDX: ffff88805442c900 RSI: ffffffff81832538 RDI: 0000000000000005
RBP: ffff88802a3ef024 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002
R13: ffff88802a3ef000 R14: dffffc0000000000 R15: 0000000000000001
FS:  000055555ef52500(0000) GS:ffff8880d6e67000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54163dbd58 CR3: 000000005fe95000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nci_unregister_device+0x68/0x300 net/nfc/nci/core.c:1314
 virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:172
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f541558eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff9bed4df8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f54157e7da0 RCX: 00007f541558eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f54157e7da0 R08: 00000000000007ec R09: 0000000d9bed50ef
R10: 00000000003ff5f0 R11: 0000000000000246 R12: 0000000000015419
R13: 00007f54157e6090 R14: ffffffffffffffff R15: 00007fff9bed4f10
 </TASK>