[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[ 14.329145][ T1662] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.450080][ C1] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 732.314707][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 732.314719][ T83] usb 6-1: new high-speed USB device number 2 using dummy_hcd [ 732.324965][ T1730] usb 3-1: new high-speed USB device number 2 using dummy_hcd [ 732.337967][ T17] usb 2-1: new high-speed USB device number 2 using dummy_hcd [ 732.344586][ T1732] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 732.352997][ T102] usb 4-1: new high-speed USB device number 2 using dummy_hcd [ 732.554651][ T83] usb 6-1: Using ep0 maxpacket: 16 [ 732.584601][ T17] usb 2-1: Using ep0 maxpacket: 16 [ 732.584607][ T12] usb 1-1: Using ep0 maxpacket: 16 [ 732.595012][ T1730] usb 3-1: Using ep0 maxpacket: 16 [ 732.604727][ T102] usb 4-1: Using ep0 maxpacket: 16 [ 732.609955][ T1732] usb 5-1: Using ep0 maxpacket: 16 [ 732.674867][ T83] usb 6-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.683241][ T83] usb 6-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.692064][ T83] usb 6-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.701357][ T83] usb 6-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.704704][ T12] usb 1-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.711340][ T83] usb 6-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.719606][ T12] usb 1-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.719622][ T12] usb 1-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.720136][ T12] usb 1-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.728683][ T83] usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 732.744669][ T1730] usb 3-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.746780][ T12] usb 1-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.746797][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 732.756748][ T1730] usb 3-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.764720][ T102] usb 4-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.772912][ T1730] usb 3-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.781950][ T102] usb 4-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.790012][ T17] usb 2-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.798698][ T102] usb 4-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.798742][ T1732] usb 5-1: config index 0 descriptor too short (expected 8475, got 27) [ 732.807037][ T17] usb 2-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.807051][ T17] usb 2-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.807143][ T17] usb 2-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.816200][ T1732] usb 5-1: config 12 has too many interfaces: 208, using maximum allowed: 32 [ 732.816213][ T1732] usb 5-1: config 12 has 1 interface, different from the descriptor's value: 208 [ 732.816794][ T1732] usb 5-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.825361][ T17] usb 2-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.825374][ T17] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 732.830222][ T1730] usb 3-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.833652][ T1732] usb 5-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.833667][ T1732] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 732.842906][ T1730] usb 3-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.851158][ T102] usb 4-1: config 12 interface 0 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 73 [ 732.859843][ T1730] usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 732.977528][ T102] usb 4-1: New USB device found, idVendor=1d50, idProduct=60c6, bcdDevice=1a.d7 [ 732.986611][ T102] usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 executing program executing program executing program [ 733.084666][ T83] usb 6-1: string descriptor 0 read error: -71 [ 733.104642][ T17] usb 2-1: string descriptor 0 read error: -71 [ 733.118617][ T17] chaoskey 2-1:12.0: Unable to register with hwrng [ 733.125808][ T83] usb 6-1: USB disconnect, device number 2 [ 733.135177][ T17] usb 2-1: USB disconnect, device number 2 [ 733.144852][ T1730] usb 3-1: string descriptor 0 read error: -71 [ 733.176827][ T1730] usb 3-1: USB disconnect, device number 2 [ 733.185219][ T1730] ================================================================== [ 733.194193][ T1730] BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.202695][ T1730] Read of size 4 at addr ffff8881cf679820 by task kworker/1:1/1730 [ 733.210567][ T1730] [ 733.212898][ T1730] CPU: 1 PID: 1730 Comm: kworker/1:1 Not tainted 5.4.0-rc5+ #0 [ 733.220413][ T1730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 733.230557][ T1730] Workqueue: usb_hub_wq hub_event [ 733.235599][ T1730] Call Trace: [ 733.238906][ T1730] dump_stack+0xca/0x13e [ 733.243137][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.249197][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.255292][ T1730] print_address_description.constprop.0+0x36/0x50 [ 733.261784][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.267837][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.273916][ T1730] __kasan_report.cold+0x1a/0x33 [ 733.278846][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.284897][ T1730] kasan_report+0xe/0x20 [ 733.289120][ T1730] check_memory_region+0x128/0x190 [ 733.294209][ T1730] refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.300086][ T1730] ? refcount_dec_and_mutex_lock+0x80/0x80 [ 733.305917][ T1730] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 733.311452][ T1730] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 733.316719][ T1730] refcount_inc_checked+0x12/0x60 [ 733.321758][ T1730] kthread_stop+0x6c/0x610 [ 733.326207][ T1730] hwrng_unregister+0x190/0x210 [ 733.331081][ T1730] chaoskey_disconnect+0x1b2/0x200 [ 733.336173][ T1730] usb_unbind_interface+0x1bd/0x8a0 [ 733.341351][ T1730] ? usb_autoresume_device+0x60/0x60 [ 733.346679][ T1730] device_release_driver_internal+0x42f/0x500 [ 733.352736][ T1730] bus_remove_device+0x2dc/0x4a0 [ 733.357660][ T1730] device_del+0x420/0xb20 [ 733.361980][ T1730] ? __device_link_del+0x2f0/0x2f0 [ 733.367117][ T1730] ? usb_remove_ep_devs+0x3e/0x80 [ 733.372141][ T1730] ? remove_intf_ep_devs+0x13f/0x1d0 [ 733.377498][ T1730] usb_disable_device+0x211/0x690 [ 733.382531][ T1730] usb_disconnect+0x284/0x8d0 [ 733.387185][ T1730] hub_event+0x16f2/0x3800 [ 733.391575][ T1730] ? hub_port_debounce+0x260/0x260 [ 733.396809][ T1730] ? find_held_lock+0x2d/0x110 [ 733.401548][ T1730] ? mark_held_locks+0xe0/0xe0 [ 733.406285][ T1730] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 733.411816][ T1730] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 733.417113][ T1730] process_one_work+0x92b/0x1530 [ 733.422035][ T1730] ? pwq_dec_nr_in_flight+0x310/0x310 [ 733.427385][ T1730] worker_thread+0x7ab/0xe20 [ 733.431952][ T1730] ? process_one_work+0x1530/0x1530 [ 733.437125][ T1730] kthread+0x318/0x420 [ 733.441182][ T1730] ? kthread_create_on_node+0xf0/0xf0 [ 733.446615][ T1730] ret_from_fork+0x24/0x30 [ 733.451016][ T1730] [ 733.453322][ T1730] Allocated by task 2: [ 733.457367][ T1730] save_stack+0x1b/0x80 [ 733.461494][ T1730] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 733.467095][ T1730] kmem_cache_alloc_node+0xdc/0x310 [ 733.472324][ T1730] copy_process+0x4201/0x6470 [ 733.476976][ T1730] _do_fork+0x129/0xec0 [ 733.481103][ T1730] kernel_thread+0xaa/0xe0 [ 733.485494][ T1730] kthreadd+0x4a2/0x680 [ 733.489624][ T1730] ret_from_fork+0x24/0x30 [ 733.494008][ T1730] [ 733.496312][ T1730] Freed by task 16: [ 733.500093][ T1730] save_stack+0x1b/0x80 [ 733.504226][ T1730] __kasan_slab_free+0x130/0x180 [ 733.509139][ T1730] kmem_cache_free+0xb9/0x380 [ 733.513787][ T1730] __put_task_struct+0x1e2/0x4c0 [ 733.518698][ T1730] delayed_put_task_struct+0x1b4/0x2c0 [ 733.524147][ T1730] rcu_core+0x630/0x1ca0 [ 733.528382][ T1730] __do_softirq+0x221/0x912 [ 733.532855][ T1730] [ 733.535174][ T1730] The buggy address belongs to the object at ffff8881cf679800 [ 733.535174][ T1730] which belongs to the cache task_struct of size 5888 [ 733.549295][ T1730] The buggy address is located 32 bytes inside of [ 733.549295][ T1730] 5888-byte region [ffff8881cf679800, ffff8881cf67af00) [ 733.562559][ T1730] The buggy address belongs to the page: [ 733.568169][ T1730] page:ffffea00073d9e00 refcount:1 mapcount:0 mapping:ffff8881da116000 index:0x0 compound_mapcount: 0 [ 733.579070][ T1730] flags: 0x200000000010200(slab|head) [ 733.584425][ T1730] raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da116000 [ 733.592984][ T1730] raw: 0000000000000000 0000000080050005 00000001ffffffff 0000000000000000 [ 733.601559][ T1730] page dumped because: kasan: bad access detected [ 733.608468][ T1730] [ 733.610774][ T1730] Memory state around the buggy address: [ 733.616382][ T1730] ffff8881cf679700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 733.624417][ T1730] ffff8881cf679780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 733.632459][ T1730] >ffff8881cf679800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 733.640499][ T1730] ^ [ 733.645605][ T1730] ffff8881cf679880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 733.653647][ T1730] ffff8881cf679900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 733.661687][ T1730] ================================================================== [ 733.669720][ T1730] Disabling lock debugging due to kernel taint [ 733.675960][ T1730] Kernel panic - not syncing: panic_on_warn set ... [ 733.682630][ T1730] CPU: 1 PID: 1730 Comm: kworker/1:1 Tainted: G B 5.4.0-rc5+ #0 [ 733.691538][ T1730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 733.701592][ T1730] Workqueue: usb_hub_wq hub_event [ 733.706587][ T1730] Call Trace: [ 733.709855][ T1730] dump_stack+0xca/0x13e [ 733.714077][ T1730] panic+0x2aa/0x6e1 [ 733.717952][ T1730] ? add_taint.cold+0x16/0x16 [ 733.722604][ T1730] ? retint_kernel+0x10/0x10 [ 733.727246][ T1730] ? trace_hardirqs_on+0x55/0x1e0 [ 733.732253][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.738292][ T1730] end_report+0x43/0x49 [ 733.742425][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.748467][ T1730] __kasan_report.cold+0xd/0x33 [ 733.753294][ T1730] ? refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.759343][ T1730] kasan_report+0xe/0x20 [ 733.763563][ T1730] check_memory_region+0x128/0x190 [ 733.768659][ T1730] refcount_inc_not_zero_checked+0x72/0x1e0 [ 733.774527][ T1730] ? refcount_dec_and_mutex_lock+0x80/0x80 [ 733.780308][ T1730] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 733.785825][ T1730] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 733.791083][ T1730] refcount_inc_checked+0x12/0x60 [ 733.796087][ T1730] kthread_stop+0x6c/0x610 [ 733.800485][ T1730] hwrng_unregister+0x190/0x210 [ 733.805310][ T1730] chaoskey_disconnect+0x1b2/0x200 [ 733.810396][ T1730] usb_unbind_interface+0x1bd/0x8a0 [ 733.815568][ T1730] ? usb_autoresume_device+0x60/0x60 [ 733.820840][ T1730] device_release_driver_internal+0x42f/0x500 [ 733.826894][ T1730] bus_remove_device+0x2dc/0x4a0 [ 733.831805][ T1730] device_del+0x420/0xb20 [ 733.836111][ T1730] ? __device_link_del+0x2f0/0x2f0 [ 733.841198][ T1730] ? usb_remove_ep_devs+0x3e/0x80 [ 733.846202][ T1730] ? remove_intf_ep_devs+0x13f/0x1d0 [ 733.851463][ T1730] usb_disable_device+0x211/0x690 [ 733.856463][ T1730] usb_disconnect+0x284/0x8d0 [ 733.861113][ T1730] hub_event+0x16f2/0x3800 [ 733.865505][ T1730] ? hub_port_debounce+0x260/0x260 [ 733.870593][ T1730] ? find_held_lock+0x2d/0x110 [ 733.875419][ T1730] ? mark_held_locks+0xe0/0xe0 [ 733.880158][ T1730] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 733.885677][ T1730] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 733.890940][ T1730] process_one_work+0x92b/0x1530 [ 733.895852][ T1730] ? pwq_dec_nr_in_flight+0x310/0x310 [ 733.901221][ T1730] worker_thread+0x7ab/0xe20 [ 733.905793][ T1730] ? process_one_work+0x1530/0x1530 [ 733.910963][ T1730] kthread+0x318/0x420 [ 733.915006][ T1730] ? kthread_create_on_node+0xf0/0xf0 [ 733.920358][ T1730] ret_from_fork+0x24/0x30 [ 733.925355][ T1730] Kernel Offset: disabled [ 733.929664][ T1730] Rebooting in 86400 seconds..