[ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. syzkaller login: [ 469.546862][ T7072] IPVS: ftp: loaded support on port[0] = 21 [ 469.869486][ T7064] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 470.109401][ T7064] usb 1-1: Using ep0 maxpacket: 16 [ 470.229578][ T7064] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 470.240665][ T7064] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has invalid wMaxPacketSize 0 [ 470.251641][ T7064] usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9 [ 470.339571][ T7064] usb 1-1: New USB device found, idVendor=045e, idProduct=07da, bcdDevice= 0.00 [ 470.348722][ T7064] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=30 [ 470.357746][ T7064] usb 1-1: SerialNumber: syz [ 470.365025][ T7064] usb 1-1: config 0 descriptor?? [ 471.071704][ T7064] microsoft 0003:045E:07DA.0001: unknown main item tag 0x0 [ 616.484259][ T1134] INFO: task syz-executor610:7072 blocked for more than 143 seconds. [ 616.492480][ T1134] Not tainted 5.7.0-rc7-syzkaller #0 [ 616.500441][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.509972][ T1134] syz-executor610 D24336 7072 7071 0x80004002 [ 616.517403][ T1134] Call Trace: [ 616.520814][ T1134] __schedule+0x805/0xc90 [ 616.526494][ T1134] ? schedule+0x188/0x220 [ 616.530926][ T1134] ? synchronize_rcu_expedited+0x495/0x5b0 [ 616.538009][ T1134] ? init_wait_entry+0xd0/0xd0 [ 616.542775][ T1134] ? rcu_exp_sel_wait_wake+0x18e0/0x18e0 [ 616.549663][ T1134] ? up_write+0xe9/0x450 [ 616.553981][ T1134] ? shrink_dentry_list+0x89b/0x8b0 [ 616.560557][ T1134] ? namespace_unlock+0x1ef/0x410 [ 616.566465][ T1134] ? free_nsproxy+0x49/0x3b0 [ 616.571057][ T1134] ? put_mnt_ns+0xe4/0x200 [ 616.576723][ T1134] ? free_nsproxy+0x49/0x3b0 [ 616.581383][ T1134] ? do_exit+0x5ea/0x1f80 [ 616.587047][ T1134] ? do_group_exit+0x15e/0x2c0 [ 616.591891][ T1134] ? trace_irq_disable_rcuidle+0x1f/0x1d0 [ 616.599515][ T1134] ? __do_sys_exit_group+0x13/0x20 [ 616.605373][ T1134] ? __se_sys_exit_group+0x10/0x10 [ 616.610477][ T1134] ? __x64_sys_exit_group+0x37/0x40 [ 616.616926][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 616.621633][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 616.628946][ T1134] [ 616.628946][ T1134] Showing all locks held in the system: [ 616.637635][ T1134] 1 lock held by khungtaskd/1134: [ 616.642662][ T1134] #0: ffffffff892e85d0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 616.653864][ T1134] 1 lock held by in:imklog/6715: [ 616.659601][ T1134] #0: ffff8880a441e6b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 [ 616.669620][ T1134] 6 locks held by kworker/1:0/7064: [ 616.675566][ T1134] 1 lock held by syz-executor610/7072: [ 616.681008][ T1134] #0: ffffffff892eab20 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x1bd/0x5b0 [ 616.693124][ T1134] 4 locks held by systemd-udevd/7099: [ 616.699404][ T1134] #0: ffff8880a7fdcc70 (&p->lock){+.+.}-{3:3}, at: seq_read+0x60/0xce0 [ 616.708641][ T1134] #1: ffff888096486888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x50/0x3b0 [ 616.718779][ T1134] #2: ffff88809fc0d660 (kn->count#78){.+.+}-{0:0}, at: kernfs_seq_start+0x6f/0x3b0 [ 616.729378][ T1134] #3: ffff8880a1df7218 (&dev->mutex){....}-{3:3}, at: serial_show+0x22/0xa0 [ 616.739114][ T1134] [ 616.741437][ T1134] ============================================= [ 616.741437][ T1134] [ 616.751176][ T1134] NMI backtrace for cpu 0 [ 616.755623][ T1134] CPU: 0 PID: 1134 Comm: khungtaskd Not tainted 5.7.0-rc7-syzkaller #0 [ 616.763855][ T1134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.773893][ T1134] Call Trace: [ 616.777278][ T1134] dump_stack+0x1e9/0x30e [ 616.781598][ T1134] nmi_cpu_backtrace+0x9f/0x180 [ 616.786500][ T1134] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 616.792549][ T1134] nmi_trigger_cpumask_backtrace+0x16a/0x280 [ 616.798575][ T1134] watchdog+0xd2a/0xd40 [ 616.802727][ T1134] kthread+0x353/0x380 [ 616.806784][ T1134] ? hungtask_pm_notify+0x50/0x50 [ 616.811789][ T1134] ? kthread_blkcg+0xd0/0xd0 [ 616.816398][ T1134] ret_from_fork+0x24/0x30 [ 616.821016][ T1134] Sending NMI from CPU 0 to CPUs 1: [ 616.827021][ C1] NMI backtrace for cpu 1 [ 616.827025][ C1] CPU: 1 PID: 7064 Comm: kworker/1:0 Not tainted 5.7.0-rc7-syzkaller #0 [ 616.827028][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.827030][ C1] Workqueue: usb_hub_wq hub_event [ 616.827035][ C1] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 [ 616.827040][ C1] Code: 4c f2 08 48 c1 e0 03 48 83 c8 18 49 89 14 02 4d 89 44 f2 18 49 ff c1 4d 89 0a c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <4c> 8b 04 24 65 48 8b 04 25 40 1e 02 00 65 8b 0d 78 96 8e 7e f7 c1 [ 616.827043][ C1] RSP: 0018:ffffc90001676cf0 EFLAGS: 00000246 [ 616.827047][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88809fb9e240 [ 616.827050][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff [ 616.827053][ C1] RBP: ffff888092d24a04 R08: ffffffff86034f3b R09: ffffc900016790cc [ 616.827055][ C1] R10: 0000000000000004 R11: 0000000000000000 R12: ffff888092d24a00 [ 616.827058][ C1] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888092d24a00 [ 616.827061][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 616.827063][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.827066][ C1] CR2: 00000000004c6e68 CR3: 0000000092d41000 CR4: 00000000001406e0 [ 616.827069][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.827072][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.827074][ C1] Call Trace: [ 616.827076][ C1] hid_setup_resolution_multiplier+0x2ab/0xbe0 [ 616.827079][ C1] ? hid_parser_global+0x8cc/0x1500 [ 616.827081][ C1] hid_open_report+0xab2/0xdd0 [ 616.827083][ C1] ms_probe+0x12f/0x3f0 [ 616.827085][ C1] hid_device_probe+0x26c/0x410 [ 616.827087][ C1] really_probe+0x704/0xf60 [ 616.827089][ C1] driver_probe_device+0xe6/0x230 [ 616.827091][ C1] ? coredump_store+0x90/0x90 [ 616.827093][ C1] bus_for_each_drv+0x108/0x170 [ 616.827095][ C1] __device_attach+0x20c/0x3a0 [ 616.827097][ C1] bus_probe_device+0xb8/0x1f0 [ 616.827099][ C1] ? device_add+0x14a4/0x1ba0 [ 616.827101][ C1] device_add+0x1828/0x1ba0 [ 616.827103][ C1] hid_add_device+0xa2a/0xef0 [ 616.827105][ C1] ? memset+0x1f/0x40 [ 616.827107][ C1] ? lockdep_init_map_waits+0x2e/0x770 [ 616.827109][ C1] usbhid_probe+0x9bd/0xd10 [ 616.827111][ C1] usb_probe_interface+0x614/0xac0 [ 616.827113][ C1] really_probe+0x761/0xf60 [ 616.827115][ C1] driver_probe_device+0xe6/0x230 [ 616.827117][ C1] ? coredump_store+0x90/0x90 [ 616.827119][ C1] bus_for_each_drv+0x108/0x170 [ 616.827121][ C1] __device_attach+0x20c/0x3a0 [ 616.827123][ C1] bus_probe_device+0xb8/0x1f0 [ 616.827125][ C1] ? device_add+0x14a4/0x1ba0 [ 616.827127][ C1] device_add+0x1828/0x1ba0 [ 616.827129][ C1] usb_set_configuration+0x19d2/0x1f20 [ 616.827131][ C1] usb_generic_driver_probe+0x82/0x140 [ 616.827133][ C1] usb_probe_device+0x12d/0x1d0 [ 616.827135][ C1] really_probe+0x761/0xf60 [ 616.827137][ C1] driver_probe_device+0xe6/0x230 [ 616.827139][ C1] ? coredump_store+0x90/0x90 [ 616.827141][ C1] bus_for_each_drv+0x108/0x170 [ 616.827147][ C1] __device_attach+0x20c/0x3a0 [ 616.827149][ C1] bus_probe_device+0xb8/0x1f0 [ 616.827151][ C1] ? device_add+0x14a4/0x1ba0 [ 616.827153][ C1] device_add+0x1828/0x1ba0 [ 616.827155][ C1] usb_new_device+0xcc3/0x1650 [ 616.827157][ C1] hub_event+0x2823/0x4cb0 [ 616.827159][ C1] ? rcu_read_lock_sched_held+0x106/0x170 [ 616.827161][ C1] process_one_work+0x76e/0xfd0 [ 616.827163][ C1] worker_thread+0xa7f/0x1450 [ 616.827165][ C1] kthread+0x353/0x380 [ 616.827167][ C1] ? rcu_lock_release+0x20/0x20 [ 616.827169][ C1] ? kthread_blkcg+0xd0/0xd0 [ 616.827171][ C1] ret_from_fork+0x24/0x30 [ 616.857049][ T1134] Kernel panic - not syncing: hung_task: blocked tasks [ 617.196969][ T1134] CPU: 0 PID: 1134 Comm: khungtaskd Not tainted 5.7.0-rc7-syzkaller #0 [ 617.205199][ T1134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.215251][ T1134] Call Trace: [ 617.218534][ T1134] dump_stack+0x1e9/0x30e [ 617.222854][ T1134] panic+0x264/0x7a0 [ 617.226743][ T1134] ? nmi_trigger_cpumask_backtrace+0x206/0x280 [ 617.232884][ T1134] watchdog+0xd3d/0xd40 [ 617.237035][ T1134] kthread+0x353/0x380 [ 617.241105][ T1134] ? hungtask_pm_notify+0x50/0x50 [ 617.246118][ T1134] ? kthread_blkcg+0xd0/0xd0 [ 617.250708][ T1134] ret_from_fork+0x24/0x30 [ 617.256660][ T1134] Kernel Offset: disabled [ 617.260989][ T1134] Rebooting in 86400 seconds..