[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.763282][ T1667] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.173560][ T1700] random: sshd: uninitialized urandom read (32 bytes read) [ 15.315377][ T1703] random: sshd: uninitialized urandom read (32 bytes read) [ 15.389543][ C1] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2019/08/24 12:43:06 parsed 1 programs 2019/08/24 12:43:07 executed programs: 0 syzkaller login: [ 27.785953][ T1737] cgroup1: Unknown subsys name 'perf_event' [ 27.792513][ T1737] cgroup1: Unknown subsys name 'net_cls' [ 28.671561][ T83] usb 1-1: new low-speed USB device number 2 using dummy_hcd [ 29.031176][ T83] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 29.039575][ T83] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 29.049943][ T83] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 29.059086][ T83] usb 1-1: config 0 has no interface number 0 [ 29.065222][ T83] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 29.075324][ T83] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 29.084377][ T83] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 29.093697][ T83] usb 1-1: config 0 descriptor?? [ 29.135948][ T83] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 29.453003][ T12] usb 1-1: USB disconnect, device number 2 [ 29.472614][ T12] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 30.241105][ T12] usb 1-1: new low-speed USB device number 3 using dummy_hcd [ 30.601161][ T12] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 30.609337][ T12] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 30.619538][ T12] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 30.628414][ T12] usb 1-1: config 0 has no interface number 0 [ 30.634538][ T12] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 30.644861][ T12] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 30.653915][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 30.662865][ T12] usb 1-1: config 0 descriptor?? [ 30.703185][ T12] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 30.901859][ T83] usb 1-1: USB disconnect, device number 3 [ 30.921903][ T83] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 31.671125][ T12] usb 1-1: new low-speed USB device number 4 using dummy_hcd [ 32.031202][ T12] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 32.039631][ T12] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 32.050168][ T12] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 32.059052][ T12] usb 1-1: config 0 has no interface number 0 [ 32.065196][ T12] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 32.075530][ T12] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 32.084579][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 32.093482][ T12] usb 1-1: config 0 descriptor?? [ 32.133606][ T12] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 32.452422][ T83] usb 1-1: USB disconnect, device number 4 [ 32.471791][ T83] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 33.241124][ T83] usb 1-1: new low-speed USB device number 5 using dummy_hcd [ 33.601221][ T83] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 33.609632][ T83] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 33.619969][ T83] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 33.629088][ T83] usb 1-1: config 0 has no interface number 0 [ 33.635240][ T83] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 33.645371][ T83] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 33.654462][ T83] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 33.663867][ T83] usb 1-1: config 0 descriptor?? [ 33.703229][ T83] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 33.901953][ T12] usb 1-1: USB disconnect, device number 5 [ 33.921820][ T12] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected 2019/08/24 12:43:14 executed programs: 2 [ 34.671129][ T83] usb 1-1: new low-speed USB device number 6 using dummy_hcd [ 35.031206][ T83] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 35.039409][ T83] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 35.049889][ T83] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 35.058986][ T83] usb 1-1: config 0 has no interface number 0 [ 35.065132][ T83] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 35.075258][ T83] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 35.084325][ T83] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 35.093718][ T83] usb 1-1: config 0 descriptor?? [ 35.132903][ T83] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 35.452362][ T12] usb 1-1: USB disconnect, device number 6 [ 35.471712][ T12] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 36.241095][ T12] usb 1-1: new low-speed USB device number 7 using dummy_hcd [ 36.601229][ T12] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 36.609561][ T12] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 36.619786][ T12] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 36.628700][ T12] usb 1-1: config 0 has no interface number 0 [ 36.634995][ T12] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 36.645098][ T12] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 36.654365][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 36.663388][ T12] usb 1-1: config 0 descriptor?? [ 36.703329][ T12] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 36.902031][ T83] usb 1-1: USB disconnect, device number 7 [ 36.921796][ T83] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 37.671081][ T12] usb 1-1: new low-speed USB device number 8 using dummy_hcd [ 38.031196][ T12] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 38.039497][ T12] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 38.049910][ T12] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 38.058789][ T12] usb 1-1: config 0 has no interface number 0 [ 38.064914][ T12] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 38.075012][ T12] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 38.084092][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 38.092945][ T12] usb 1-1: config 0 descriptor?? [ 38.133961][ T12] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 38.452450][ T83] usb 1-1: USB disconnect, device number 8 [ 38.481793][ T83] iowarrior 1-1:0.236: I/O-Warror #0 now disconnected [ 39.251100][ T12] usb 1-1: new low-speed USB device number 9 using dummy_hcd [ 39.611204][ T12] usb 1-1: config 0 has an invalid interface number: 236 but max is 2 [ 39.619403][ T12] usb 1-1: config 0 has an invalid descriptor of length 99, skipping remainder of the config [ 39.629619][ T12] usb 1-1: config 0 has 1 interface, different from the descriptor's value: 3 [ 39.638491][ T12] usb 1-1: config 0 has no interface number 0 [ 39.644713][ T12] usb 1-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk; changing to Interrupt [ 39.654835][ T12] usb 1-1: New USB device found, idVendor=07c0, idProduct=1501, bcdDevice=74.a0 [ 39.663905][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 39.672803][ T12] usb 1-1: config 0 descriptor?? [ 39.714006][ T12] iowarrior 1-1:0.236: IOWarrior product=0x1501, serial= interface=236 now attached to iowarrior0 [ 39.957736][ T12] usb 1-1: USB disconnect, device number 9 [ 39.972136][ T12] ================================================================== [ 39.980339][ T12] BUG: KASAN: use-after-free in __mutex_lock+0xf23/0x1360 [ 39.987437][ T12] Read of size 8 at addr ffff8881ce87b1d8 by task kworker/0:1/12 [ 39.995125][ T12] [ 39.997435][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc5+ #28 [ 40.004938][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.015174][ T12] Workqueue: usb_hub_wq hub_event [ 40.020276][ T12] Call Trace: [ 40.023627][ T12] dump_stack+0xca/0x13e [ 40.027878][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.033171][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.037943][ T12] print_address_description+0x6a/0x32c [ 40.043479][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.048287][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.053051][ T12] __kasan_report.cold+0x1a/0x33 [ 40.057990][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.062802][ T12] kasan_report+0xe/0x12 [ 40.067202][ T12] __mutex_lock+0xf23/0x1360 [ 40.071784][ T12] ? lock_downgrade+0x6e0/0x6e0 [ 40.076687][ T12] ? iowarrior_disconnect+0xf0/0x2c0 [ 40.081970][ T12] ? mutex_trylock+0x2c0/0x2c0 [ 40.086737][ T12] ? __mutex_unlock_slowpath+0xea/0x670 [ 40.092272][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 40.097553][ T12] ? wait_for_completion+0x3c0/0x3c0 [ 40.102829][ T12] ? __kasan_slab_free+0x145/0x180 [ 40.108707][ T12] ? iowarrior_disconnect+0xf0/0x2c0 [ 40.113980][ T12] iowarrior_disconnect+0xf0/0x2c0 [ 40.119138][ T12] usb_unbind_interface+0x1bd/0x8a0 [ 40.124342][ T12] ? usb_autoresume_device+0x60/0x60 [ 40.129630][ T12] device_release_driver_internal+0x42f/0x500 [ 40.135774][ T12] bus_remove_device+0x2dc/0x4a0 [ 40.140697][ T12] device_del+0x420/0xb10 [ 40.145137][ T12] ? __device_links_no_driver+0x240/0x240 [ 40.150918][ T12] ? usb_remove_ep_devs+0x3e/0x80 [ 40.156008][ T12] ? remove_intf_ep_devs+0x13f/0x1d0 [ 40.161281][ T12] usb_disable_device+0x211/0x690 [ 40.166299][ T12] usb_disconnect+0x284/0x8d0 [ 40.170959][ T12] hub_event+0x1454/0x3640 [ 40.175425][ T12] ? find_held_lock+0x2d/0x110 [ 40.180233][ T12] ? mark_held_locks+0xe0/0xe0 [ 40.184992][ T12] ? hub_port_debounce+0x260/0x260 [ 40.190159][ T12] process_one_work+0x92b/0x1530 [ 40.195171][ T12] ? pwq_dec_nr_in_flight+0x310/0x310 [ 40.200632][ T12] ? do_raw_spin_lock+0x11a/0x280 [ 40.205649][ T12] worker_thread+0x96/0xe20 [ 40.210142][ T12] ? process_one_work+0x1530/0x1530 [ 40.215367][ T12] kthread+0x318/0x420 [ 40.219416][ T12] ? kthread_create_on_node+0xf0/0xf0 [ 40.224821][ T12] ret_from_fork+0x24/0x30 [ 40.229427][ T12] [ 40.231741][ T12] Allocated by task 12: [ 40.235887][ T12] save_stack+0x1b/0x80 [ 40.240087][ T12] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 40.245718][ T12] iowarrior_probe+0x7a/0x10b2 [ 40.250480][ T12] usb_probe_interface+0x305/0x7a0 [ 40.255599][ T12] really_probe+0x281/0x6d0 [ 40.260206][ T12] driver_probe_device+0x101/0x1b0 [ 40.265429][ T12] __device_attach_driver+0x1c2/0x220 [ 40.270853][ T12] bus_for_each_drv+0x162/0x1e0 [ 40.275705][ T12] __device_attach+0x217/0x360 [ 40.280618][ T12] bus_probe_device+0x1e4/0x290 [ 40.285552][ T12] device_add+0xae6/0x16f0 [ 40.289958][ T12] usb_set_configuration+0xdf6/0x1670 [ 40.295505][ T12] generic_probe+0x9d/0xd5 [ 40.299930][ T12] usb_probe_device+0x99/0x100 [ 40.304690][ T12] really_probe+0x281/0x6d0 [ 40.309451][ T12] driver_probe_device+0x101/0x1b0 [ 40.314576][ T12] __device_attach_driver+0x1c2/0x220 [ 40.319965][ T12] bus_for_each_drv+0x162/0x1e0 [ 40.324867][ T12] __device_attach+0x217/0x360 [ 40.329723][ T12] bus_probe_device+0x1e4/0x290 [ 40.334655][ T12] device_add+0xae6/0x16f0 [ 40.339126][ T12] usb_new_device.cold+0x6a4/0xe79 [ 40.344238][ T12] hub_event+0x1b5c/0x3640 [ 40.348653][ T12] process_one_work+0x92b/0x1530 [ 40.353708][ T12] worker_thread+0x96/0xe20 [ 40.358208][ T12] kthread+0x318/0x420 [ 40.362622][ T12] ret_from_fork+0x24/0x30 [ 40.367253][ T12] [ 40.369578][ T12] Freed by task 1923: [ 40.373559][ T12] save_stack+0x1b/0x80 [ 40.377995][ T12] __kasan_slab_free+0x130/0x180 [ 40.383024][ T12] kfree+0xe4/0x2f0 [ 40.386847][ T12] iowarrior_release+0x187/0x280 [ 40.391777][ T12] __fput+0x2d7/0x840 [ 40.395754][ T12] task_work_run+0x13f/0x1c0 [ 40.400339][ T12] exit_to_usermode_loop+0x1d2/0x200 [ 40.405612][ T12] do_syscall_64+0x45f/0x580 [ 40.410191][ T12] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.416073][ T12] [ 40.418391][ T12] The buggy address belongs to the object at ffff8881ce87b180 [ 40.418391][ T12] which belongs to the cache kmalloc-512 of size 512 [ 40.432436][ T12] The buggy address is located 88 bytes inside of [ 40.432436][ T12] 512-byte region [ffff8881ce87b180, ffff8881ce87b380) [ 40.446133][ T12] The buggy address belongs to the page: [ 40.451870][ T12] page:ffffea00073a1e80 refcount:1 mapcount:0 mapping:ffff8881da002500 index:0x0 compound_mapcount: 0 [ 40.463166][ T12] flags: 0x200000000010200(slab|head) [ 40.468522][ T12] raw: 0200000000010200 ffffea00074af780 0000000900000009 ffff8881da002500 [ 40.477212][ T12] raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 [ 40.485776][ T12] page dumped because: kasan: bad access detected [ 40.492165][ T12] [ 40.495201][ T12] Memory state around the buggy address: [ 40.500822][ T12] ffff8881ce87b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.508945][ T12] ffff8881ce87b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 40.517016][ T12] >ffff8881ce87b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.525062][ T12] ^ [ 40.531981][ T12] ffff8881ce87b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.540175][ T12] ffff8881ce87b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 40.548228][ T12] ================================================================== 2019/08/24 12:43:20 executed programs: 4 [ 40.556268][ T12] Disabling lock debugging due to kernel taint [ 40.562733][ T12] Kernel panic - not syncing: panic_on_warn set ... [ 40.569324][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G B 5.3.0-rc5+ #28 [ 40.578160][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.588221][ T12] Workqueue: usb_hub_wq hub_event [ 40.593567][ T12] Call Trace: [ 40.596835][ T12] dump_stack+0xca/0x13e [ 40.601053][ T12] panic+0x2a3/0x6da [ 40.604922][ T12] ? add_taint.cold+0x16/0x16 [ 40.609575][ T12] ? retint_kernel+0x10/0x10 [ 40.614155][ T12] ? trace_hardirqs_on+0x55/0x1e0 [ 40.619163][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.623923][ T12] end_report+0x43/0x49 [ 40.628099][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.632837][ T12] __kasan_report.cold+0xd/0x33 [ 40.637664][ T12] ? __mutex_lock+0xf23/0x1360 [ 40.642427][ T12] kasan_report+0xe/0x12 [ 40.646654][ T12] __mutex_lock+0xf23/0x1360 [ 40.651340][ T12] ? lock_downgrade+0x6e0/0x6e0 [ 40.656196][ T12] ? iowarrior_disconnect+0xf0/0x2c0 [ 40.661464][ T12] ? mutex_trylock+0x2c0/0x2c0 [ 40.666206][ T12] ? __mutex_unlock_slowpath+0xea/0x670 [ 40.671735][ T12] ? lockdep_hardirqs_on+0x379/0x580 [ 40.677511][ T12] ? wait_for_completion+0x3c0/0x3c0 [ 40.682800][ T12] ? __kasan_slab_free+0x145/0x180 [ 40.687911][ T12] ? iowarrior_disconnect+0xf0/0x2c0 [ 40.693185][ T12] iowarrior_disconnect+0xf0/0x2c0 [ 40.698276][ T12] usb_unbind_interface+0x1bd/0x8a0 [ 40.703467][ T12] ? usb_autoresume_device+0x60/0x60 [ 40.708768][ T12] device_release_driver_internal+0x42f/0x500 [ 40.714820][ T12] bus_remove_device+0x2dc/0x4a0 [ 40.719759][ T12] device_del+0x420/0xb10 [ 40.724158][ T12] ? __device_links_no_driver+0x240/0x240 [ 40.729878][ T12] ? usb_remove_ep_devs+0x3e/0x80 [ 40.734892][ T12] ? remove_intf_ep_devs+0x13f/0x1d0 [ 40.740180][ T12] usb_disable_device+0x211/0x690 [ 40.745188][ T12] usb_disconnect+0x284/0x8d0 [ 40.749847][ T12] hub_event+0x1454/0x3640 [ 40.754268][ T12] ? find_held_lock+0x2d/0x110 [ 40.759111][ T12] ? mark_held_locks+0xe0/0xe0 [ 40.763947][ T12] ? hub_port_debounce+0x260/0x260 [ 40.769055][ T12] process_one_work+0x92b/0x1530 [ 40.773979][ T12] ? pwq_dec_nr_in_flight+0x310/0x310 [ 40.779324][ T12] ? do_raw_spin_lock+0x11a/0x280 [ 40.784323][ T12] worker_thread+0x96/0xe20 [ 40.788806][ T12] ? process_one_work+0x1530/0x1530 [ 40.793981][ T12] kthread+0x318/0x420 [ 40.798025][ T12] ? kthread_create_on_node+0xf0/0xf0 [ 40.803372][ T12] ret_from_fork+0x24/0x30 [ 40.808232][ T12] Kernel Offset: disabled [ 40.812558][ T12] Rebooting in 86400 seconds..