* [syzbot] [ppp?] possible deadlock in serial8250_handle_irq
@ 2023-07-22 1:33 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2023-07-22 1:33 UTC (permalink / raw)
To: davem, edumazet, kuba, linux-kernel, linux-ppp, netdev, pabeni,
paulus, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: ccff6d117d8d Merge tag 'perf-tools-fixes-for-v6.5-1-2023-0..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1713931ea80000
kernel config: https://syzkaller.appspot.com/x/.config?x=77b9a3cf8f44c6da
dashboard link: https://syzkaller.appspot.com/bug?extid=5fd749c74105b0e1b302
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d74f4e7b353d/disk-ccff6d11.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7c6a13965ec1/vmlinux-ccff6d11.xz
kernel image: https://storage.googleapis.com/syzbot-assets/282577dc8831/bzImage-ccff6d11.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5fd749c74105b0e1b302@syzkaller.appspotmail.com
=====================================================
WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
6.5.0-rc2-syzkaller-00046-gccff6d117d8d #0 Not tainted
-----------------------------------------------------
kworker/0:8/17656 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8d9464f8 (disc_data_lock#2){.+.+}-{2:2}, at: ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
and this task is already holding:
ffffffff92407e78 (&port_lock_key){-.-.}-{2:2}, at: serial_port_runtime_resume+0xcf/0x330 drivers/tty/serial/serial_port.c:38
which would create a new lock dependency:
(&port_lock_key){-.-.}-{2:2} -> (disc_data_lock#2){.+.+}-{2:2}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&port_lock_key){-.-.}-{2:2}
... which became HARDIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_handle_irq+0x91/0xbe0 drivers/tty/serial/8250/8250_port.c:1917
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
__intel_idle_hlt drivers/idle/intel_idle.c:205 [inline]
intel_idle_hlt+0x11/0x20 drivers/idle/intel_idle.c:224
cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
cpuidle_idle_call kernel/sched/idle.c:215 [inline]
do_idle+0x315/0x3f0 kernel/sched/idle.c:282
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
start_secondary+0x200/0x290 arch/x86/kernel/smpboot.c:326
secondary_startup_64_no_verify+0x167/0x16b
to a HARDIRQ-irq-unsafe lock:
(disc_data_lock#2){.+.+}-{2:2}
... which became HARDIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_receive+0x2f/0x1580 drivers/net/ppp/ppp_async.c:343
tty_ldisc_receive_buf+0x143/0x180 drivers/tty/tty_buffer.c:461
tty_port_default_receive_buf+0x6f/0xa0 drivers/tty/tty_port.c:39
receive_buf drivers/tty/tty_buffer.c:515 [inline]
flush_to_ldisc+0x252/0x7c0 drivers/tty/tty_buffer.c:565
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(disc_data_lock#2);
local_irq_disable();
lock(&port_lock_key);
lock(disc_data_lock#2);
<Interrupt>
lock(&port_lock_key);
*** DEADLOCK ***
4 locks held by kworker/0:8/17656:
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline]
#0: ffff888018a5e538 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567
#1: ffffc9000c1cfd80 ((work_completion)(&dev->power.work)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571
#2: ffffffff92407e78 (&port_lock_key){-.-.}-{2:2}, at: serial_port_runtime_resume+0xcf/0x330 drivers/tty/serial/serial_port.c:38
#3: ffff88805536a098 (&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){-.-.}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_handle_irq+0x91/0xbe0 drivers/tty/serial/8250/8250_port.c:1917
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
__intel_idle_hlt drivers/idle/intel_idle.c:205 [inline]
intel_idle_hlt+0x11/0x20 drivers/idle/intel_idle.c:224
cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
cpuidle_idle_call kernel/sched/idle.c:215 [inline]
do_idle+0x315/0x3f0 kernel/sched/idle.c:282
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
start_secondary+0x200/0x290 arch/x86/kernel/smpboot.c:326
secondary_startup_64_no_verify+0x167/0x16b
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_handle_irq+0x91/0xbe0 drivers/tty/serial/8250/8250_port.c:1917
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0x51/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
__do_softirq+0x1dd/0x965 kernel/softirq.c:541
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
spin_unlock_irq include/linux/spinlock.h:401 [inline]
seccomp_set_mode_filter kernel/seccomp.c:1916 [inline]
do_seccomp+0xae1/0x27f0 kernel/seccomp.c:1991
prctl_set_seccomp+0x4b/0x70 kernel/seccomp.c:2044
__do_sys_prctl+0xd11/0x1d40 kernel/sys.c:2490
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_do_set_termios+0x334/0x1240 drivers/tty/serial/8250/8250_port.c:2794
serial8250_set_termios+0x6b/0x80 drivers/tty/serial/8250/8250_port.c:2913
uart_set_options+0x30e/0x5e0 drivers/tty/serial/serial_core.c:2284
serial8250_console_setup+0x18a/0x430 drivers/tty/serial/8250/8250_port.c:3507
univ8250_console_setup+0x168/0x210 drivers/tty/serial/8250/8250_core.c:631
try_enable_preferred_console+0x24d/0x470 kernel/printk/printk.c:3228
register_console+0x331/0x10d0 kernel/printk/printk.c:3401
univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:716
console_init+0xba/0x5c0 kernel/printk/printk.c:3601
start_kernel+0x25a/0x480 init/main.c:1004
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537
secondary_startup_64_no_verify+0x167/0x16b
}
... key at: [<ffffffff924070e0>] port_lock_key+0x0/0x40
the dependencies between the lock to be acquired
and HARDIRQ-irq-unsafe lock:
-> (disc_data_lock#2){.+.+}-{2:2} {
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_receive+0x2f/0x1580 drivers/net/ppp/ppp_async.c:343
tty_ldisc_receive_buf+0x143/0x180 drivers/tty/tty_buffer.c:461
tty_port_default_receive_buf+0x6f/0xa0 drivers/tty/tty_port.c:39
receive_buf drivers/tty/tty_buffer.c:515 [inline]
flush_to_ldisc+0x252/0x7c0 drivers/tty/tty_buffer.c:565
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_receive+0x2f/0x1580 drivers/net/ppp/ppp_async.c:343
tty_ldisc_receive_buf+0x143/0x180 drivers/tty/tty_buffer.c:461
tty_port_default_receive_buf+0x6f/0xa0 drivers/tty/tty_port.c:39
receive_buf drivers/tty/tty_buffer.c:515 [inline]
flush_to_ldisc+0x252/0x7c0 drivers/tty/tty_buffer.c:565
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
ppp_asynctty_close+0x1c/0x1c0 drivers/net/ppp/ppp_async.c:219
tty_ldisc_close+0x111/0x190 drivers/tty/tty_ldisc.c:455
tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:607
tty_ldisc_release+0x116/0x2a0 drivers/tty/tty_ldisc.c:775
tty_release_struct+0x23/0xe0 drivers/tty/tty_io.c:1698
tty_release+0xe23/0x1410 drivers/tty/tty_io.c:1869
__fput+0x3fd/0xac0 fs/file_table.c:384
task_work_run+0x14d/0x240 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_receive+0x2f/0x1580 drivers/net/ppp/ppp_async.c:343
tty_ldisc_receive_buf+0x143/0x180 drivers/tty/tty_buffer.c:461
tty_port_default_receive_buf+0x6f/0xa0 drivers/tty/tty_port.c:39
receive_buf drivers/tty/tty_buffer.c:515 [inline]
flush_to_ldisc+0x252/0x7c0 drivers/tty/tty_buffer.c:565
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
}
... key at: [<ffffffff8d9464f8>] disc_data_lock+0x18/0x60
... acquired at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
__start_tx drivers/tty/serial/8250/8250_port.c:1547 [inline]
serial8250_start_tx+0x7a8/0x980 drivers/tty/serial/8250/8250_port.c:1656
serial_port_runtime_resume+0x29e/0x330 drivers/tty/serial/serial_port.c:40
__rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:392
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:446
rpm_resume+0xdb9/0x1980 drivers/base/power/runtime.c:912
pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
stack backtrace:
CPU: 0 PID: 17656 Comm: kworker/0:8 Not tainted 6.5.0-rc2-syzkaller-00046-gccff6d117d8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: pm pm_runtime_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2634 [inline]
check_irq_usage+0x10b8/0x1c70 kernel/locking/lockdep.c:2873
check_prev_add kernel/locking/lockdep.c:3146 [inline]
check_prevs_add kernel/locking/lockdep.c:3261 [inline]
validate_chain kernel/locking/lockdep.c:3876 [inline]
__lock_acquire+0x2e53/0x5de0 kernel/locking/lockdep.c:5144
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
__start_tx drivers/tty/serial/8250/8250_port.c:1547 [inline]
serial8250_start_tx+0x7a8/0x980 drivers/tty/serial/8250/8250_port.c:1656
serial_port_runtime_resume+0x29e/0x330 drivers/tty/serial/serial_port.c:40
__rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:392
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:446
rpm_resume+0xdb9/0x1980 drivers/base/power/runtime.c:912
pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
usb 3-1: USB disconnect, device number 41
usb 3-1: new high-speed USB device number 42 using dummy_hcd
usb 3-1: Using ep0 maxpacket: 16
usb 3-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 3-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9
usb 3-1: New USB device found, idVendor=045e, idProduct=07da, bcdDevice= 0.00
usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 3-1: config 0 descriptor??
HID 045e:07da: Invalid code 65791 type 1
input: HID 045e:07da as /devices/platform/dummy_hcd.2/usb3/3-1/3-1:0.0/0003:045E:07DA.0037/input/input64
microsoft 0003:045E:07DA.0037: input,hidraw0: USB HID v0.00 Device [HID 045e:07da] on usb-dummy_hcd.2-1/input0
---
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2023-07-22 1:33 [syzbot] [ppp?] possible deadlock in serial8250_handle_irq syzbot
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