=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
6.15.0-rc1-syzkaller #0 Not tainted
-----------------------------------------------------
kworker/u8:5/1078 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8f575f78 (disc_data_lock#3){.+.+}-{3:3}, at: sp_get+0x18/0xf0 drivers/net/hamradio/6pack.c:370
and this task is already holding:
ffffffff9ae25ff8 (&port_lock_key){-.-.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
ffffffff9ae25ff8 (&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){.+.+}-{3:3}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&port_lock_key){-.-.}-{3:3}
... which became HARDIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x95/0xcb0 drivers/tty/serial/8250/8250_port.c:1921
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1970
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:254 [inline]
call_irq_handler arch/x86/kernel/irq.c:266 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:80
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148
to a HARDIRQ-irq-unsafe lock:
(disc_data_lock#3){.+.+}-{3:3}
... which became HARDIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x59/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(disc_data_lock#3);
local_irq_disable();
lock(&port_lock_key);
lock(disc_data_lock#3);
<Interrupt>
lock(&port_lock_key);
*** DEADLOCK ***
6 locks held by kworker/u8:5/1078:
#0: ffff88801b481148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90003e0fd18 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888025558ca0 (&buf->lock){+.+.}-{4:4}, at: flush_to_ldisc+0x34/0x780 drivers/tty/tty_buffer.c:467
#3: ffff88805bc310a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1c/0x80 drivers/tty/tty_ldisc.c:263
#4: ffffffff9ae25ff8 (&port_lock_key){-.-.}-{3:3}, at: uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
#4: ffffffff9ae25ff8 (&port_lock_key){-.-.}-{3:3}, at: uart_write+0x13b/0xb30 drivers/tty/serial/serial_core.c:626
#5: ffff88805bc310a0 (&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 kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x95/0xcb0 drivers/tty/serial/8250/8250_port.c:1921
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1970
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:254 [inline]
call_irq_handler arch/x86/kernel/irq.c:266 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:80
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x95/0xcb0 drivers/tty/serial/8250/8250_port.c:1921
serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1970
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:254 [inline]
call_irq_handler arch/x86/kernel/irq.c:266 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:292
common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
blk_mq_sched_restart block/blk-mq-sched.h:27 [inline]
__blk_mq_free_request+0x22e/0x530 block/blk-mq.c:782
blk_mq_free_request+0x1e9/0x340 block/blk-mq.c:799
__blk_mq_end_request+0x1b8/0x5b0 block/blk-mq.c:1136
scsi_end_request+0x445/0x9c0 drivers/scsi/scsi_lib.c:671
scsi_io_completion+0x17d/0x14c0 drivers/scsi/scsi_lib.c:1079
scsi_complete+0x124/0x250 drivers/scsi/scsi_lib.c:1544
blk_complete_reqs+0xae/0xf0 block/blk-mq.c:1220
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
common_interrupt+0xbf/0xe0 arch/x86/kernel/irq.c:285
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:80
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x310/0x1710 drivers/tty/serial/8250/8250_port.c:2778
serial8250_set_termios+0x6e/0x80 drivers/tty/serial/8250/8250_port.c:2903
uart_set_options+0x31a/0x5f0 drivers/tty/serial/serial_core.c:2310
serial8250_console_setup+0x189/0x450 drivers/tty/serial/8250/8250_port.c:3519
univ8250_console_setup+0x1eb/0x2e0 drivers/tty/serial/8250/8250_core.c:428
console_call_setup kernel/printk/printk.c:3799 [inline]
console_call_setup kernel/printk/printk.c:3790 [inline]
try_enable_preferred_console+0x2fd/0x530 kernel/printk/printk.c:3843
register_console+0x3ab/0x11b0 kernel/printk/printk.c:4037
univ8250_console_init+0x5f/0x90 drivers/tty/serial/8250/8250_core.c:513
console_init+0x14f/0x680 kernel/printk/printk.c:4323
start_kernel+0x29f/0x4d0 init/main.c:1034
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0xb0/0xc0 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x148
}
... key at: [<ffffffff9ae25260>] port_lock_key+0x0/0x40
the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (disc_data_lock#3){.+.+}-{3:3} {
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x59/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x59/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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_release+0x109/0x2e0 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x23/0xe0 drivers/tty/tty_io.c:1690
tty_release+0xe2d/0x1430 drivers/tty/tty_io.c:1861
__fput+0x3ff/0xb70 fs/file_table.c:465
task_work_run+0x14d/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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+0x59/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
}
... key at: [<ffffffff8f575f78>] disc_data_lock+0x18/0xfe0 6pack.c:-1
... acquired at:
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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:1842
__start_tx+0x3e9/0x4a0 drivers/tty/serial/8250/8250_port.c:1547
serial8250_start_tx+0x368/0x530 drivers/tty/serial/8250/8250_port.c:1657
__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+0x3d0/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
stack backtrace:
CPU: 1 UID: 0 PID: 1078 Comm: kworker/u8:5 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:2652 [inline]
check_irq_usage+0x7dc/0x920 kernel/locking/lockdep.c:2893
check_prev_add kernel/locking/lockdep.c:3170 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1189/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__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:1842
__start_tx+0x3e9/0x4a0 drivers/tty/serial/8250/8250_port.c:1547
serial8250_start_tx+0x368/0x530 drivers/tty/serial/8250/8250_port.c:1657
__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+0x3d0/0x1c90 drivers/net/hamradio/6pack.c:424
tty_ldisc_receive_buf+0x157/0x1a0 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+0x268/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>