[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.89' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 23.855963][ T81] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 24.066029][ T81] usb 1-1: config 168 contains an unexpected descriptor of type 0x1, skipping [ 24.075044][ T81] usb 1-1: config 168 has an invalid interface descriptor of length 2, skipping [ 24.084421][ T81] usb 1-1: config 168 interface 0 altsetting 255 has an invalid endpoint with address 0x80, skipping [ 24.095560][ T81] usb 1-1: config 168 interface 0 altsetting 255 bulk endpoint 0x8 has invalid maxpacket 1024 [ 24.105965][ T81] usb 1-1: config 168 interface 0 altsetting 255 endpoint 0x1 has invalid maxpacket 512, setting to 64 [ 24.117045][ T81] usb 1-1: config 168 interface 0 altsetting 255 bulk endpoint 0x2 has invalid maxpacket 64 [ 24.127235][ T81] usb 1-1: config 168 interface 0 altsetting 255 endpoint 0x9 has invalid maxpacket 1023, setting to 64 [ 24.138459][ T81] usb 1-1: config 168 interface 0 altsetting 255 has an invalid endpoint with address 0x0, skipping [ 24.149294][ T81] usb 1-1: config 168 interface 0 altsetting 255 has an invalid endpoint with address 0x0, skipping [ 24.160115][ T81] usb 1-1: config 168 interface 0 altsetting 255 has a duplicate endpoint with address 0x9, skipping [ 24.171055][ T81] usb 1-1: config 168 interface 0 altsetting 255 has a duplicate endpoint with address 0x7, skipping [ 24.181970][ T81] usb 1-1: config 168 interface 0 altsetting 255 has 13 endpoint descriptors, different from the interface descriptor's value: 16 [ 24.195404][ T81] usb 1-1: config 168 interface 0 has no altsetting 0 [ 24.356036][ T81] usb 1-1: New USB device found, idVendor=2040, idProduct=c604, bcdDevice=54.d9 [ 24.365102][ T81] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 24.373159][ T81] usb 1-1: Product: syz [ 24.377375][ T81] usb 1-1: Manufacturer: syz [ 24.381964][ T81] usb 1-1: SerialNumber: syz executing program [ 24.727478][ T81] usb 1-1: dvb_usb_v2: found a 'Hauppauge 126xxx DVBT' in warm state [ 24.737414][ T81] usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer [ 24.748044][ T81] dvbdev: DVB: registering new adapter (Hauppauge 126xxx DVBT) [ 24.755961][ T81] usb 1-1: media controller created [ 24.765037][ T81] dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. [ 24.778904][ T81] usb 1-1: selecting invalid altsetting 2 [ 24.784777][ T81] set interface failed [ 24.784785][ T81] ------------[ cut here ]------------ [ 24.794656][ T81] DEBUG_LOCKS_WARN_ON(lock->magic != lock) [ 24.794701][ T81] WARNING: CPU: 1 PID: 81 at kernel/locking/mutex.c:938 __mutex_lock+0xd2c/0x1360 [ 24.809749][ T81] Kernel panic - not syncing: panic_on_warn set ... [ 24.816354][ T81] CPU: 1 PID: 81 Comm: kworker/1:1 Not tainted 5.6.0-rc3-syzkaller #0 [ 24.824537][ T81] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.834596][ T81] Workqueue: usb_hub_wq hub_event [ 24.839818][ T81] Call Trace: [ 24.843125][ T81] dump_stack+0xef/0x16e [ 24.847372][ T81] ? __mutex_lock+0xce0/0x1360 [ 24.852200][ T81] panic+0x2aa/0x6e1 [ 24.856094][ T81] ? add_taint.cold+0x16/0x16 [ 24.860772][ T81] ? __probe_kernel_read+0x188/0x1d0 [ 24.866061][ T81] ? __warn.cold+0x14/0x30 [ 24.870520][ T81] ? __warn+0xd5/0x1c8 [ 24.874596][ T81] ? __mutex_lock+0xd2c/0x1360 [ 24.879366][ T81] __warn.cold+0x2f/0x30 [ 24.883614][ T81] ? __mutex_lock+0xd2c/0x1360 [ 24.888396][ T81] report_bug+0x27b/0x2f0 [ 24.892742][ T81] do_error_trap+0x12b/0x1e0 [ 24.897340][ T81] ? __mutex_lock+0xd2c/0x1360 [ 24.902105][ T81] do_invalid_op+0x32/0x40 [ 24.906515][ T81] ? __mutex_lock+0xd2c/0x1360 [ 24.911273][ T81] invalid_op+0x23/0x30 [ 24.915446][ T81] RIP: 0010:__mutex_lock+0xd2c/0x1360 [ 24.920810][ T81] Code: d2 0f 85 f1 05 00 00 44 8b 05 40 c3 57 02 45 85 c0 0f 85 0f f4 ff ff 48 c7 c6 40 cc e6 85 48 c7 c7 40 ca e6 85 e8 4c a2 85 fb <0f> 0b e9 f5 f3 ff ff 65 48 8b 1c 25 00 0f 02 00 be 08 00 00 00 48 [ 24.940421][ T81] RSP: 0018:ffff8881d8a1eed0 EFLAGS: 00010282 [ 24.946600][ T81] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 24.954562][ T81] RDX: 0000000000000000 RSI: ffffffff812977dd RDI: ffffed103b143dcc [ 24.962551][ T81] RBP: ffff8881d8a1f040 R08: ffff8881d8a10000 R09: fffffbfff0e1fbe1 [ 24.970532][ T81] R10: fffffbfff0e1fbe0 R11: ffffffff870fdf03 R12: 0000000000000000 [ 24.978630][ T81] R13: dffffc0000000000 R14: ffff8881c5f969c8 R15: 0000000000000001 [ 24.986643][ T81] ? vprintk_func+0x7d/0x113 [ 24.991238][ T81] ? mxl111sf_ctrl_msg+0xc2/0x240 [ 24.996256][ T81] ? find_held_lock+0x2d/0x110 [ 25.001012][ T81] ? vprintk_emit+0xe2/0x3d0 [ 25.005610][ T81] ? mutex_trylock+0x2c0/0x2c0 [ 25.010376][ T81] ? mark_lock+0xbc/0x1160 [ 25.014789][ T81] ? mark_held_locks+0x9f/0xe0 [ 25.019551][ T81] ? vprintk_emit+0x112/0x3d0 [ 25.024239][ T81] ? mxl111sf_ctrl_msg+0xc2/0x240 [ 25.029277][ T81] mxl111sf_ctrl_msg+0xc2/0x240 [ 25.034150][ T81] mxl111sf_write_reg+0x9a/0x150 [ 25.039115][ T81] ? mxl111sf_frontend_attach_mercury_mh+0x9b0/0x9b0 [ 25.045824][ T81] ? usb_set_interface+0x7ab/0xad0 [ 25.050955][ T81] mxl1x1sf_soft_reset+0x6b/0x190 [ 25.055996][ T81] mxl111sf_attach_demod+0x28c/0x760 [ 25.061309][ T81] ? mxl111sf_attach_demod+0x760/0x760 [ 25.066770][ T81] dvb_usbv2_probe.cold+0x2826/0x2efe [ 25.072147][ T81] ? dvb_usb_start_feed+0xff0/0xff0 [ 25.077344][ T81] ? rpm_callback+0x230/0x230 [ 25.082027][ T81] ? lockdep_hardirqs_on+0x382/0x580 [ 25.087313][ T81] ? __pm_runtime_resume+0x111/0x180 [ 25.092598][ T81] usb_probe_interface+0x310/0x800 [ 25.097711][ T81] ? usb_probe_device+0x230/0x230 [ 25.102788][ T81] really_probe+0x290/0xac0 [ 25.107355][ T81] driver_probe_device+0x223/0x350 [ 25.112464][ T81] __device_attach_driver+0x1d1/0x290 [ 25.117839][ T81] ? driver_allows_async_probing+0x160/0x160 [ 25.123822][ T81] bus_for_each_drv+0x162/0x1e0 [ 25.128677][ T81] ? bus_rescan_devices+0x20/0x20 [ 25.133701][ T81] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 25.139506][ T81] ? lockdep_hardirqs_on+0x382/0x580 [ 25.144791][ T81] __device_attach+0x217/0x390 [ 25.149569][ T81] ? device_bind_driver+0xd0/0xd0 [ 25.154595][ T81] bus_probe_device+0x1e4/0x290 [ 25.159448][ T81] device_add+0x1459/0x1bf0 [ 25.163967][ T81] ? wait_for_completion+0x3c0/0x3c0 [ 25.169268][ T81] ? device_link_remove+0x110/0x110 [ 25.174477][ T81] usb_set_configuration+0xe47/0x17d0 [ 25.179871][ T81] usb_generic_driver_probe+0x9d/0xe0 [ 25.185256][ T81] usb_probe_device+0xd9/0x230 [ 25.190020][ T81] ? usb_suspend+0x5f0/0x5f0 [ 25.194750][ T81] really_probe+0x290/0xac0 [ 25.199257][ T81] driver_probe_device+0x223/0x350 [ 25.204367][ T81] __device_attach_driver+0x1d1/0x290 [ 25.209757][ T81] ? driver_allows_async_probing+0x160/0x160 [ 25.215740][ T81] bus_for_each_drv+0x162/0x1e0 [ 25.220590][ T81] ? bus_rescan_devices+0x20/0x20 [ 25.225616][ T81] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 25.231421][ T81] ? lockdep_hardirqs_on+0x382/0x580 [ 25.236725][ T81] __device_attach+0x217/0x390 [ 25.241618][ T81] ? device_bind_driver+0xd0/0xd0 [ 25.246666][ T81] bus_probe_device+0x1e4/0x290 [ 25.251535][ T81] device_add+0x1459/0x1bf0 [ 25.256072][ T81] ? device_link_remove+0x110/0x110 [ 25.261281][ T81] usb_new_device.cold+0x540/0xcd0 [ 25.266395][ T81] hub_event+0x21cb/0x4300 [ 25.270817][ T81] ? hub_port_debounce+0x350/0x350 [ 25.275932][ T81] ? find_held_lock+0x2d/0x110 [ 25.280811][ T81] ? mark_held_locks+0xe0/0xe0 [ 25.285848][ T81] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 25.291422][ T81] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 25.296711][ T81] process_one_work+0x94b/0x1620 [ 25.301650][ T81] ? pwq_dec_nr_in_flight+0x310/0x310 [ 25.307024][ T81] ? do_raw_spin_lock+0x129/0x290 [ 25.312049][ T81] worker_thread+0x96/0xe20 [ 25.316556][ T81] ? process_one_work+0x1620/0x1620 [ 25.321771][ T81] kthread+0x318/0x420 [ 25.325856][ T81] ? kthread_create_on_node+0xf0/0xf0 [ 25.331256][ T81] ret_from_fork+0x24/0x30 [ 25.336056][ T81] Kernel Offset: disabled [ 25.340401][ T81] Rebooting in 86400 seconds..