[syzbot] [ppp?] possible deadlock in serial8250_handle_irq
syzbot <[email protected]>
| Newsgroups | gmane.linux.ppp,gmane.linux.kernel,gmane.linux.network |
|---|---|
| Message-ID | <[email protected]> |
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: [email protected] ===================================================== 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at [email protected]. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup