[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 84.478406][ T31] audit: type=1800 audit(1572552900.523:25): pid=12089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 84.501763][ T31] audit: type=1800 audit(1572552900.543:26): pid=12089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 84.547888][ T31] audit: type=1800 audit(1572552900.573:27): pid=12089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.91' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 96.470590][T12241] IPVS: ftp: loaded support on port[0] = 21 [ 96.792273][ T5] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 97.032393][ T5] usb 1-1: Using ep0 maxpacket: 32 [ 97.152264][ T5] usb 1-1: config 255 has an invalid interface number: 198 but max is 0 [ 97.160705][ T5] usb 1-1: config 255 has no interface number 0 [ 97.167264][ T5] usb 1-1: config 255 interface 198 altsetting 0 endpoint 0x1 has an invalid bInterval 112, changing to 10 [ 97.178803][ T5] usb 1-1: New USB device found, idVendor=2019, idProduct=ed18, bcdDevice=94.0b [ 97.187970][ T5] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 97.472379][ T5] usb 1-1: string descriptor 0 read error: -71 [ 97.483946][ T5] r8712u: register rtl8712_netdev_ops to netdev_ops [ 97.491237][ T5] usb 1-1: r8712u: USB_SPEED_HIGH with 1 endpoints [ 97.548317][ T5] ===================================================== [ 97.548321][ T5] BUG: KMSAN: uninit-value in string+0x4b3/0x600 [ 97.548324][ T5] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.4.0-rc5+ #0 [ 97.548328][ T5] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.548331][ T5] Workqueue: usb_hub_wq hub_event [ 97.548335][ T5] Call Trace: [ 97.548337][ T5] dump_stack+0x191/0x1f0 [ 97.548340][ T5] kmsan_report+0x128/0x220 [ 97.548342][ T5] __msan_warning+0x73/0xe0 [ 97.548344][ T5] string+0x4b3/0x600 [ 97.548347][ T5] vsnprintf+0x218f/0x3210 [ 97.548349][ T5] pointer+0x175d/0x1d10 [ 97.548352][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548354][ T5] vsnprintf+0x1c0c/0x3210 [ 97.548356][ T5] vscnprintf+0xc2/0x180 [ 97.548359][ T5] vprintk_store+0xef/0x11e0 [ 97.548362][ T5] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 97.548364][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548367][ T5] vprintk_emit+0x2c6/0x860 [ 97.548369][ T5] dev_vprintk_emit+0x940/0xb28 [ 97.548372][ T5] ? kmsan_get_metadata+0x39/0x350 [ 97.548374][ T5] ? __msan_poison_alloca+0x158/0x1a0 [ 97.548377][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548379][ T5] dev_printk_emit+0x1ce/0x210 [ 97.548382][ T5] __dev_printk+0x3af/0x460 [ 97.548384][ T5] _dev_info+0x1e5/0x22a [ 97.548386][ T5] ? usb_read8+0xe7/0x130 [ 97.548389][ T5] r871xu_drv_init+0x143e/0x2ad0 [ 97.548391][ T5] ? r871x_dev_unload+0x2d0/0x2d0 [ 97.548394][ T5] ? r871x_dev_unload+0x2d0/0x2d0 [ 97.548396][ T5] usb_probe_interface+0xd19/0x1310 [ 97.548399][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548402][ T5] ? usb_register_driver+0x860/0x860 [ 97.548404][ T5] really_probe+0xd91/0x1f90 [ 97.548407][ T5] driver_probe_device+0x1ba/0x510 [ 97.548409][ T5] __device_attach_driver+0x5b8/0x790 [ 97.548412][ T5] bus_for_each_drv+0x28e/0x3b0 [ 97.548414][ T5] ? deferred_probe_work_func+0x400/0x400 [ 97.548417][ T5] __device_attach+0x489/0x750 [ 97.548419][ T5] device_initial_probe+0x4a/0x60 [ 97.548422][ T5] bus_probe_device+0x131/0x390 [ 97.548424][ T5] device_add+0x25b5/0x2df0 [ 97.548427][ T5] usb_set_configuration+0x309f/0x3710 [ 97.548429][ T5] generic_probe+0xe7/0x280 [ 97.548432][ T5] ? usb_choose_configuration+0xae0/0xae0 [ 97.548434][ T5] usb_probe_device+0x146/0x200 [ 97.548437][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548439][ T5] ? usb_register_device_driver+0x500/0x500 [ 97.548442][ T5] really_probe+0xd91/0x1f90 [ 97.548444][ T5] driver_probe_device+0x1ba/0x510 [ 97.548447][ T5] __device_attach_driver+0x5b8/0x790 [ 97.548450][ T5] bus_for_each_drv+0x28e/0x3b0 [ 97.548452][ T5] ? deferred_probe_work_func+0x400/0x400 [ 97.548455][ T5] __device_attach+0x489/0x750 [ 97.548457][ T5] device_initial_probe+0x4a/0x60 [ 97.548460][ T5] bus_probe_device+0x131/0x390 [ 97.548462][ T5] device_add+0x25b5/0x2df0 [ 97.548465][ T5] usb_new_device+0x23e5/0x2fb0 [ 97.548467][ T5] hub_event+0x581d/0x72f0 [ 97.548470][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548472][ T5] ? led_work+0x720/0x720 [ 97.548475][ T5] ? led_work+0x720/0x720 [ 97.548477][ T5] process_one_work+0x1572/0x1ef0 [ 97.548479][ T5] worker_thread+0x111b/0x2460 [ 97.548482][ T5] kthread+0x4b5/0x4f0 [ 97.548484][ T5] ? process_one_work+0x1ef0/0x1ef0 [ 97.548487][ T5] ? kthread_blkcg+0xf0/0xf0 [ 97.548489][ T5] ret_from_fork+0x35/0x40 [ 97.548491][ T5] [ 97.548494][ T5] Local variable description: ----data@usb_read8 [ 97.548496][ T5] Variable was created at: [ 97.548499][ T5] usb_read8+0x5d/0x130 [ 97.548501][ T5] usb_read8+0x5d/0x130 [ 97.548504][ T5] ===================================================== [ 97.548507][ T5] Disabling lock debugging due to kernel taint [ 97.548510][ T5] Kernel panic - not syncing: panic_on_warn set ... [ 97.548514][ T5] CPU: 0 PID: 5 Comm: kworker/0:0 Tainted: G B 5.4.0-rc5+ #0 [ 97.548517][ T5] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.548520][ T5] Workqueue: usb_hub_wq hub_event [ 97.548524][ T5] Call Trace: [ 97.548526][ T5] dump_stack+0x191/0x1f0 [ 97.548528][ T5] panic+0x3c9/0xc1e [ 97.548530][ T5] kmsan_report+0x215/0x220 [ 97.548533][ T5] __msan_warning+0x73/0xe0 [ 97.548535][ T5] string+0x4b3/0x600 [ 97.548537][ T5] vsnprintf+0x218f/0x3210 [ 97.548539][ T5] pointer+0x175d/0x1d10 [ 97.548542][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548544][ T5] vsnprintf+0x1c0c/0x3210 [ 97.548547][ T5] vscnprintf+0xc2/0x180 [ 97.548549][ T5] vprintk_store+0xef/0x11e0 [ 97.548552][ T5] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 97.548555][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548557][ T5] vprintk_emit+0x2c6/0x860 [ 97.548560][ T5] dev_vprintk_emit+0x940/0xb28 [ 97.548562][ T5] ? kmsan_get_metadata+0x39/0x350 [ 97.548565][ T5] ? __msan_poison_alloca+0x158/0x1a0 [ 97.548567][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548570][ T5] dev_printk_emit+0x1ce/0x210 [ 97.548572][ T5] __dev_printk+0x3af/0x460 [ 97.548574][ T5] _dev_info+0x1e5/0x22a [ 97.548577][ T5] ? usb_read8+0xe7/0x130 [ 97.548579][ T5] r871xu_drv_init+0x143e/0x2ad0 [ 97.548582][ T5] ? r871x_dev_unload+0x2d0/0x2d0 [ 97.548584][ T5] ? r871x_dev_unload+0x2d0/0x2d0 [ 97.548587][ T5] usb_probe_interface+0xd19/0x1310 [ 97.548590][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548592][ T5] ? usb_register_driver+0x860/0x860 [ 97.548595][ T5] really_probe+0xd91/0x1f90 [ 97.548597][ T5] driver_probe_device+0x1ba/0x510 [ 97.548600][ T5] __device_attach_driver+0x5b8/0x790 [ 97.548602][ T5] bus_for_each_drv+0x28e/0x3b0 [ 97.548605][ T5] ? deferred_probe_work_func+0x400/0x400 [ 97.548607][ T5] __device_attach+0x489/0x750 [ 97.548610][ T5] device_initial_probe+0x4a/0x60 [ 97.548612][ T5] bus_probe_device+0x131/0x390 [ 97.548614][ T5] device_add+0x25b5/0x2df0 [ 97.548617][ T5] usb_set_configuration+0x309f/0x3710 [ 97.548619][ T5] generic_probe+0xe7/0x280 [ 97.548622][ T5] ? usb_choose_configuration+0xae0/0xae0 [ 97.548625][ T5] usb_probe_device+0x146/0x200 [ 97.548627][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548630][ T5] ? usb_register_device_driver+0x500/0x500 [ 97.548632][ T5] really_probe+0xd91/0x1f90 [ 97.548635][ T5] driver_probe_device+0x1ba/0x510 [ 97.548637][ T5] __device_attach_driver+0x5b8/0x790 [ 97.548640][ T5] bus_for_each_drv+0x28e/0x3b0 [ 97.548643][ T5] ? deferred_probe_work_func+0x400/0x400 [ 97.548645][ T5] __device_attach+0x489/0x750 [ 97.548648][ T5] device_initial_probe+0x4a/0x60 [ 97.548650][ T5] bus_probe_device+0x131/0x390 [ 97.548653][ T5] device_add+0x25b5/0x2df0 [ 97.548655][ T5] usb_new_device+0x23e5/0x2fb0 [ 97.548657][ T5] hub_event+0x581d/0x72f0 [ 97.548661][ T5] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 97.548663][ T5] ? led_work+0x720/0x720 [ 97.548665][ T5] ? led_work+0x720/0x720 [ 97.548668][ T5] process_one_work+0x1572/0x1ef0 [ 97.548670][ T5] worker_thread+0x111b/0x2460 [ 97.548672][ T5] kthread+0x4b5/0x4f0 [ 97.548675][ T5] ? process_one_work+0x1ef0/0x1ef0 [ 97.548677][ T5] ? kthread_blkcg+0xf0/0xf0 [ 97.548680][ T5] ret_from_fork+0x35/0x40 [ 97.548682][ T5] Kernel Offset: disabled