syzbot


possible deadlock in serial8250_handle_irq

Status: upstream: reported on 2023/07/22 01:33
Subsystems: hams
[Documentation on labels]
Reported-by: syzbot+5fd749c74105b0e1b302@syzkaller.appspotmail.com
First crash: 510d, last: 22h25m
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly hams report (Aug 2024) 0 (1) 2024/08/13 08:52
[syzbot] [ppp?] possible deadlock in serial8250_handle_irq 0 (1) 2023/07/22 01:33

Sample crash report:
=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0 Not tainted
-----------------------------------------------------
kworker/u8:10/6224 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8f3348b8 (disc_data_lock){.+.+}-{3:3}, at: sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370

and this task is already holding:
ffffffff9ab116f8 (&port_lock_key){-.-.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
ffffffff9ab116f8 (&port_lock_key){-.-.}-{3:3}, at: uart_write+0x13b/0xb30 drivers/tty/serial/serial_core.c:626
which would create a new lock dependency:
 (&port_lock_key){-.-.}-{3:3} -> (disc_data_lock){.+.+}-{3:3}

but this new dependency connects a HARDIRQ-irq-safe lock:
 (&port_lock_key){-.-.}-{3:3}

... which became HARDIRQ-irq-safe at:
  lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
  __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_handle_irq+0x95/0xc80 drivers/tty/serial/8250/8250_port.c:1919
  serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1968
  serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:86
  __handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
  handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
  handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
  handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
  generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
  handle_irq arch/x86/kernel/irq.c:247 [inline]
  call_irq_handler arch/x86/kernel/irq.c:259 [inline]
  __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
  common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:278
  asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
  native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
  arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
  acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111
  acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699
  cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268
  cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389
  cpuidle_idle_call kernel/sched/idle.c:230 [inline]
  do_idle+0x310/0x3f0 kernel/sched/idle.c:325
  cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
  start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:314
  common_startup_64+0x13e/0x148

to a HARDIRQ-irq-unsafe lock:
 (disc_data_lock){.+.+}-{3:3}

... which became HARDIRQ-irq-unsafe at:
...
  lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
  sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
  sixpack_receive_buf drivers/net/hamradio/6pack.c:433 [inline]
  sixpack_receive_buf+0x59/0x1c80 drivers/net/hamradio/6pack.c:424
  tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
  tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
  receive_buf drivers/tty/tty_buffer.c:445 [inline]
  flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
  process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
  process_scheduled_works kernel/workqueue.c:3310 [inline]
  worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
  kthread+0x2c1/0x3a0 kernel/kthread.c:389
  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:

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(disc_data_lock);
                               local_irq_disable();
                               lock(&port_lock_key);
                               lock(disc_data_lock);
  <Interrupt>
    lock(&port_lock_key);

 *** DEADLOCK ***

6 locks held by kworker/u8:10/6224:
 #0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204
 #1: ffffc9000b59fd80 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205
 #2: ffff888025268ca0 (&buf->lock){+.+.}-{4:4}, at: flush_to_ldisc+0x31/0x780 drivers/tty/tty_buffer.c:467
 #3: ffff88805af050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1c/0x80 drivers/tty/tty_ldisc.c:263
 #4: ffffffff9ab116f8 (&port_lock_key){-.-.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
 #4: ffffffff9ab116f8 (&port_lock_key){-.-.}-{3:3}, at: uart_write+0x13b/0xb30 drivers/tty/serial/serial_core.c:626
 #5: ffff88805af050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1c/0x80 drivers/tty/tty_ldisc.c:263

the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&port_lock_key){-.-.}-{3:3} {
   IN-HARDIRQ-W at:
                    lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                    __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_handle_irq+0x95/0xc80 drivers/tty/serial/8250/8250_port.c:1919
                    serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1968
                    serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:86
                    __handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
                    handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
                    handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
                    handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
                    generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
                    handle_irq arch/x86/kernel/irq.c:247 [inline]
                    call_irq_handler arch/x86/kernel/irq.c:259 [inline]
                    __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
                    common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:278
                    asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
                    native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
                    arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
                    acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111
                    acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:699
                    cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:268
                    cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389
                    cpuidle_idle_call kernel/sched/idle.c:230 [inline]
                    do_idle+0x310/0x3f0 kernel/sched/idle.c:325
                    cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
                    start_secondary+0x222/0x2b0 arch/x86/kernel/smpboot.c:314
                    common_startup_64+0x13e/0x148
   IN-SOFTIRQ-W at:
                    lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                    __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_handle_irq+0x95/0xc80 drivers/tty/serial/8250/8250_port.c:1919
                    serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1968
                    serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:86
                    __handle_irq_event_percpu+0x229/0x7d0 kernel/irq/handle.c:158
                    handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
                    handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
                    handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
                    generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
                    handle_irq arch/x86/kernel/irq.c:247 [inline]
                    call_irq_handler arch/x86/kernel/irq.c:259 [inline]
                    __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
                    common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:278
                    asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
                    variable_ffs arch/x86/include/asm/bitops.h:321 [inline]
                    handle_softirqs+0x1da/0x8f0 kernel/softirq.c:542
                    __do_softirq kernel/softirq.c:588 [inline]
                    invoke_softirq kernel/softirq.c:428 [inline]
                    __irq_exit_rcu+0x109/0x170 kernel/softirq.c:655
                    irq_exit_rcu+0x9/0x30 kernel/softirq.c:671
                    instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
                    sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
                    asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
                    console_flush_all+0x9a4/0xc60 kernel/printk/printk.c:3211
                    __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
                    kauditd_printk_skb kernel/audit.c:546 [inline]
                    kauditd_hold_skb+0x205/0x250 kernel/audit.c:581
                    kauditd_send_queue+0x236/0x290 kernel/audit.c:766
                    kauditd_thread+0x611/0xa60 kernel/audit.c:890
                    kthread+0x2c1/0x3a0 kernel/kthread.c:389
                    ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
   INITIAL USE at:
                   lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                   __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_do_set_termios+0x307/0x16f0 drivers/tty/serial/8250/8250_port.c:2761
                   serial8250_set_termios+0x6e/0x80 drivers/tty/serial/8250/8250_port.c:2880
                   uart_set_options+0x31b/0x5f0 drivers/tty/serial/serial_core.c:2327
                   serial8250_console_setup+0x18a/0x460 drivers/tty/serial/8250/8250_port.c:3475
                   univ8250_console_setup+0x1d4/0x2c0 drivers/tty/serial/8250/8250_core.c:428
                   console_call_setup kernel/printk/printk.c:3773 [inline]
                   console_call_setup kernel/printk/printk.c:3764 [inline]
                   try_enable_preferred_console+0x2fd/0x530 kernel/printk/printk.c:3817
                   register_console+0x3ac/0x1170 kernel/printk/printk.c:4011
                   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
 }
 ... key      at: [<ffffffff9ab10960>] port_lock_key+0x0/0x40

the dependencies between the lock to be acquired
 and HARDIRQ-irq-unsafe lock:
-> (disc_data_lock){.+.+}-{3:3} {
   HARDIRQ-ON-R at:
                    lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                    sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
                    sixpack_receive_buf drivers/net/hamradio/6pack.c:433 [inline]
                    sixpack_receive_buf+0x59/0x1c80 drivers/net/hamradio/6pack.c:424
                    tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
                    tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
                    receive_buf drivers/tty/tty_buffer.c:445 [inline]
                    flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
                    process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
                    process_scheduled_works kernel/workqueue.c:3310 [inline]
                    worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
                    kthread+0x2c1/0x3a0 kernel/kthread.c:389
                    ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
   SOFTIRQ-ON-R at:
                    lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                    sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
                    sixpack_receive_buf drivers/net/hamradio/6pack.c:433 [inline]
                    sixpack_receive_buf+0x59/0x1c80 drivers/net/hamradio/6pack.c:424
                    tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
                    tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
                    receive_buf drivers/tty/tty_buffer.c:445 [inline]
                    flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
                    process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
                    process_scheduled_works kernel/workqueue.c:3310 [inline]
                    worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
                    kthread+0x2c1/0x3a0 kernel/kthread.c:389
                    ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
   INITIAL USE at:
                   lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
                   sixpack_close+0x1e/0x2f0 drivers/net/hamradio/6pack.c:641
                   tty_ldisc_close+0x111/0x1a0 drivers/tty/tty_ldisc.c:455
                   tty_ldisc_kill+0x8e/0x150 drivers/tty/tty_ldisc.c:613
                   tty_ldisc_hangup+0x311/0x6a0 drivers/tty/tty_ldisc.c:729
                   __tty_hangup.part.0+0x3f8/0x890 drivers/tty/tty_io.c:624
                   __tty_hangup drivers/tty/tty_io.c:691 [inline]
                   tty_vhangup drivers/tty/tty_io.c:694 [inline]
                   tty_vhangup drivers/tty/tty_io.c:691 [inline]
                   tty_ioctl+0xf42/0x15d0 drivers/tty/tty_io.c:2743
                   vfs_ioctl fs/ioctl.c:51 [inline]
                   __do_sys_ioctl fs/ioctl.c:906 [inline]
                   __se_sys_ioctl fs/ioctl.c:892 [inline]
                   __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
                   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
   INITIAL READ USE at:
                        lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
                        sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
                        sixpack_receive_buf drivers/net/hamradio/6pack.c:433 [inline]
                        sixpack_receive_buf+0x59/0x1c80 drivers/net/hamradio/6pack.c:424
                        tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
                        tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
                        receive_buf drivers/tty/tty_buffer.c:445 [inline]
                        flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
                        process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
                        process_scheduled_works kernel/workqueue.c:3310 [inline]
                        worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
                        kthread+0x2c1/0x3a0 kernel/kthread.c:389
                        ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 }
 ... key      at: [<ffffffff8f3348b8>] disc_data_lock+0x18/0xfe0
 ... acquired at:
   lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
   sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
   sixpack_write_wakeup+0x20/0x390 drivers/net/hamradio/6pack.c:391
   tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:517
   tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
   serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1840
   __start_tx+0x3e9/0x4a0 drivers/tty/serial/8250/8250_port.c:1546
   serial8250_start_tx+0x363/0x530 drivers/tty/serial/8250/8250_port.c:1655
   __uart_start+0x292/0x4c0 drivers/tty/serial/serial_core.c:160
   uart_write+0x218/0xb30 drivers/tty/serial/serial_core.c:635
   decode_prio_command drivers/net/hamradio/6pack.c:868 [inline]
   sixpack_decode drivers/net/hamradio/6pack.c:943 [inline]
   sixpack_receive_buf drivers/net/hamradio/6pack.c:447 [inline]
   sixpack_receive_buf+0x3d7/0x1c80 drivers/net/hamradio/6pack.c:424
   tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
   tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
   receive_buf drivers/tty/tty_buffer.c:445 [inline]
   flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
   process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
   process_scheduled_works kernel/workqueue.c:3310 [inline]
   worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
   kthread+0x2c1/0x3a0 kernel/kthread.c:389
   ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244


stack backtrace:
CPU: 0 UID: 0 PID: 6224 Comm: kworker/u8:10 Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_bad_irq_dependency kernel/locking/lockdep.c:2647 [inline]
 check_irq_usage+0xf22/0x1290 kernel/locking/lockdep.c:2888
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x24b4/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
 _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
 sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
 sixpack_write_wakeup+0x20/0x390 drivers/net/hamradio/6pack.c:391
 tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:517
 tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
 serial8250_tx_chars+0x68e/0x860 drivers/tty/serial/8250/8250_port.c:1840
 __start_tx+0x3e9/0x4a0 drivers/tty/serial/8250/8250_port.c:1546
 serial8250_start_tx+0x363/0x530 drivers/tty/serial/8250/8250_port.c:1655
 __uart_start+0x292/0x4c0 drivers/tty/serial/serial_core.c:160
 uart_write+0x218/0xb30 drivers/tty/serial/serial_core.c:635
 decode_prio_command drivers/net/hamradio/6pack.c:868 [inline]
 sixpack_decode drivers/net/hamradio/6pack.c:943 [inline]
 sixpack_receive_buf drivers/net/hamradio/6pack.c:447 [inline]
 sixpack_receive_buf+0x3d7/0x1c80 drivers/net/hamradio/6pack.c:424
 tty_ldisc_receive_buf+0x153/0x190 drivers/tty/tty_buffer.c:391
 tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:445 [inline]
 flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 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>

Crashes (39):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/08 06:37 upstream 7503345ac5f5 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/12/02 22:12 upstream e70140ba0d2b bb326ffb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/11/26 03:41 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/11/20 03:58 upstream a5c93bfec0be 7d02db5a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/11/17 16:35 upstream 4a5df3796467 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/11/15 02:54 upstream cfaaa7d010d1 77f3eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root possible deadlock in serial8250_handle_irq
2024/10/26 11:23 upstream 850925a8133c 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2024/08/01 10:19 upstream 21b136cc63d2 1e9c4cf3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2024/07/11 15:20 upstream a19ea421490d c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2024/04/21 06:07 upstream 977b1ef51866 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2024/04/20 21:26 upstream 13a2e429f644 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2024/03/28 03:24 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in serial8250_handle_irq
2023/12/18 02:33 upstream 0e389834672c 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in serial8250_handle_irq
2023/10/14 12:37 upstream 727fb8376504 6388bc36 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2023/10/10 09:01 upstream 94f6f0550c62 c9be5398 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in serial8250_handle_irq
2023/09/21 23:49 upstream b5cbe7c00aa0 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in serial8250_handle_irq
2023/09/19 00:22 upstream 2cf0f7156238 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in serial8250_handle_irq
2024/03/29 16:23 upstream fe46a7dd189e c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2024/03/13 06:11 upstream 9187210eee7d db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/10/10 17:55 upstream 94f6f0550c62 83165b57 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/10/08 21:30 upstream 37faf07bf90a 5e837c76 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/09/28 05:45 upstream 633b47cb009d 2895a507 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/09/20 19:23 upstream 5d2f53532ecc 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/07 04:51 upstream 52a93d39b17d 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in serial8250_handle_irq
2023/08/04 19:17 upstream c1a515d3c027 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in serial8250_handle_irq
2023/07/19 08:20 upstream ccff6d117d8d 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in serial8250_handle_irq
2023/08/25 02:23 upstream b5cc3833f13a 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/24 12:52 upstream 93f5de5f648d 4d7ae7ab .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/21 18:36 upstream f7757129e3de 6b415825 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/21 01:21 upstream 706a74159504 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/17 18:29 upstream 16931859a650 74b106b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/08 15:15 upstream 14f9643dc90a 3c27dfcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/08/03 11:47 upstream ec351c8f2e62 39a91c18 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/07/23 08:40 upstream c2782531397f 27cbe77f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/07/21 16:06 upstream f7e3a1bafdea 28847498 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/07/21 02:38 upstream 57f1f9dd3abe 28847498 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2023/07/18 01:25 upstream fdf0eaf11452 20f8b3c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in serial8250_handle_irq
2024/04/09 16:15 linux-next a053fd3ca5d1 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in serial8250_handle_irq
2024/04/06 03:55 linux-next 8568bb2ccc27 18ea8213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in serial8250_handle_irq
* Struck through repros no longer work on HEAD.