[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[ 15.370326][ C1] random: crng init done [?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 '10.128.10.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.050866][ T21] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 25.290824][ T21] usb 1-1: Using ep0 maxpacket: 16 [ 25.410855][ T21] usb 1-1: config 0 has an invalid interface number: 87 but max is 0 [ 25.419005][ T21] usb 1-1: config 0 has no interface number 0 [ 25.425162][ T21] usb 1-1: config 0 interface 87 altsetting 0 endpoint 0x8D has an invalid bInterval 0, changing to 7 [ 25.436391][ T21] usb 1-1: config 0 interface 87 altsetting 0 bulk endpoint 0x5 has invalid maxpacket 0 [ 25.448885][ T21] usb 1-1: config 0 interface 87 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 0 [ 25.458723][ T21] usb 1-1: New USB device found, idVendor=0ace, idProduct=1602, bcdDevice=b0.c3 [ 25.467785][ T21] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 25.476933][ T21] usb 1-1: config 0 descriptor?? [ 25.522041][ T21] cdc_acm 1-1:0.87: invalid descriptor buffer length [ 25.528785][ T21] cdc_acm 1-1:0.87: No union descriptor, testing for castrated device [ 25.537439][ T21] cdc_acm: probe of 1-1:0.87 failed with error -12 [ 25.723267][ T21] usb 1-1: USB disconnect, device number 2 [ 25.730599][ T21] ================================================================== [ 25.738802][ T21] BUG: KASAN: use-after-free in __mutex_lock+0xf23/0x1360 [ 25.745891][ T21] Read of size 8 at addr ffff8881d331a388 by task kworker/1:1/21 [ 25.753580][ T21] [ 25.755886][ T21] CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.3.0-rc2+ #23 [ 25.763315][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.773357][ T21] Workqueue: usb_hub_wq hub_event [ 25.778363][ T21] Call Trace: [ 25.781634][ T21] dump_stack+0xca/0x13e [ 25.785859][ T21] ? __mutex_lock+0xf23/0x1360 [ 25.790659][ T21] ? __mutex_lock+0xf23/0x1360 [ 25.795417][ T21] print_address_description+0x6a/0x32c [ 25.800938][ T21] ? __mutex_lock+0xf23/0x1360 [ 25.805677][ T21] ? __mutex_lock+0xf23/0x1360 [ 25.810412][ T21] __kasan_report.cold+0x1a/0x33 [ 25.815329][ T21] ? __mutex_lock+0xf23/0x1360 [ 25.820115][ T21] kasan_report+0xe/0x12 [ 25.824358][ T21] __mutex_lock+0xf23/0x1360 [ 25.828937][ T21] ? device_release_driver_internal+0x23/0x4c0 [ 25.835072][ T21] ? mark_held_locks+0x9f/0xe0 [ 25.840383][ T21] ? lockdep_hardirqs_on+0x379/0x580 [ 25.845658][ T21] ? mutex_trylock+0x2c0/0x2c0 [ 25.850400][ T21] ? lockdep_hardirqs_on+0x379/0x580 [ 25.855665][ T21] ? __kasan_slab_free+0x145/0x180 [ 25.860763][ T21] ? kfree_const+0x51/0x60 [ 25.865156][ T21] ? kfree+0xe4/0x2f0 [ 25.869123][ T21] ? device_remove_bin_file+0x30/0x30 [ 25.874479][ T21] ? device_release_driver_internal+0x23/0x4c0 [ 25.880610][ T21] device_release_driver_internal+0x23/0x4c0 [ 25.886568][ T21] bus_remove_device+0x2dc/0x4a0 [ 25.891499][ T21] device_del+0x420/0xb10 [ 25.895810][ T21] ? __device_links_no_driver+0x240/0x240 [ 25.901551][ T21] ? usb_remove_ep_devs+0x3e/0x80 [ 25.906577][ T21] ? remove_intf_ep_devs+0x13f/0x1d0 [ 25.911841][ T21] usb_disable_device+0x211/0x690 [ 25.916887][ T21] usb_disconnect+0x284/0x8d0 [ 25.921546][ T21] hub_event+0x1454/0x3640 [ 25.925935][ T21] ? find_held_lock+0x2d/0x110 [ 25.930672][ T21] ? mark_held_locks+0xe0/0xe0 [ 25.935419][ T21] ? hub_port_debounce+0x260/0x260 [ 25.940551][ T21] process_one_work+0x92b/0x1530 [ 25.945473][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 25.950932][ T21] ? do_raw_spin_lock+0x11a/0x280 [ 25.955973][ T21] worker_thread+0x96/0xe20 [ 25.960458][ T21] ? process_one_work+0x1530/0x1530 [ 25.965632][ T21] kthread+0x318/0x420 [ 25.969756][ T21] ? kthread_create_on_node+0xf0/0xf0 [ 25.975117][ T21] ret_from_fork+0x24/0x30 [ 25.979513][ T21] [ 25.981818][ T21] Allocated by task 21: [ 25.985949][ T21] save_stack+0x1b/0x80 [ 25.990224][ T21] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 25.996021][ T21] usb_set_configuration+0x2c4/0x1670 [ 26.001375][ T21] generic_probe+0x9d/0xd5 [ 26.005772][ T21] usb_probe_device+0x99/0x100 [ 26.010532][ T21] really_probe+0x281/0x650 [ 26.015017][ T21] driver_probe_device+0x101/0x1b0 [ 26.020138][ T21] __device_attach_driver+0x1c2/0x220 [ 26.025493][ T21] bus_for_each_drv+0x15c/0x1e0 [ 26.030318][ T21] __device_attach+0x217/0x360 [ 26.035053][ T21] bus_probe_device+0x1e4/0x290 [ 26.039883][ T21] device_add+0xae6/0x16f0 [ 26.044276][ T21] usb_new_device.cold+0x6a4/0xe79 [ 26.049359][ T21] hub_event+0x1b5c/0x3640 [ 26.053850][ T21] process_one_work+0x92b/0x1530 [ 26.058761][ T21] worker_thread+0x96/0xe20 [ 26.063282][ T21] kthread+0x318/0x420 [ 26.067337][ T21] ret_from_fork+0x24/0x30 [ 26.071780][ T21] [ 26.074088][ T21] Freed by task 21: [ 26.077868][ T21] save_stack+0x1b/0x80 [ 26.081995][ T21] __kasan_slab_free+0x130/0x180 [ 26.086905][ T21] kfree+0xe4/0x2f0 [ 26.090770][ T21] device_release+0x71/0x200 [ 26.095420][ T21] kobject_put+0x171/0x280 [ 26.099966][ T21] put_device+0x1b/0x30 [ 26.104118][ T21] klist_put+0xce/0x170 [ 26.108258][ T21] bus_remove_device+0x3a4/0x4a0 [ 26.113171][ T21] device_del+0x420/0xb10 [ 26.117474][ T21] usb_disable_device+0x211/0x690 [ 26.122473][ T21] usb_disconnect+0x284/0x8d0 [ 26.127119][ T21] hub_event+0x1454/0x3640 [ 26.131532][ T21] process_one_work+0x92b/0x1530 [ 26.136444][ T21] worker_thread+0x96/0xe20 [ 26.140919][ T21] kthread+0x318/0x420 [ 26.144974][ T21] ret_from_fork+0x24/0x30 [ 26.149363][ T21] [ 26.151668][ T21] The buggy address belongs to the object at ffff8881d331a200 [ 26.151668][ T21] which belongs to the cache kmalloc-2k of size 2048 [ 26.165696][ T21] The buggy address is located 392 bytes inside of [ 26.165696][ T21] 2048-byte region [ffff8881d331a200, ffff8881d331aa00) [ 26.179028][ T21] The buggy address belongs to the page: [ 26.184654][ T21] page:ffffea00074cc600 refcount:1 mapcount:0 mapping:ffff8881da00c000 index:0x0 compound_mapcount: 0 [ 26.195613][ T21] flags: 0x200000000010200(slab|head) [ 26.200970][ T21] raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c000 [ 26.209608][ T21] raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000 [ 26.218169][ T21] page dumped because: kasan: bad access detected [ 26.224553][ T21] [ 26.226859][ T21] Memory state around the buggy address: [ 26.232466][ T21] ffff8881d331a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.240507][ T21] ffff8881d331a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.248548][ T21] >ffff8881d331a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.256583][ T21] ^ [ 26.260958][ T21] ffff8881d331a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.269002][ T21] ffff8881d331a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.277036][ T21] ================================================================== [ 26.285104][ T21] Disabling lock debugging due to kernel taint [ 26.291356][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 26.297976][ T21] CPU: 1 PID: 21 Comm: kworker/1:1 Tainted: G B 5.3.0-rc2+ #23 [ 26.306791][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.317055][ T21] Workqueue: usb_hub_wq hub_event [ 26.322084][ T21] Call Trace: [ 26.325355][ T21] dump_stack+0xca/0x13e [ 26.329577][ T21] panic+0x2a3/0x6da [ 26.333451][ T21] ? add_taint.cold+0x16/0x16 [ 26.338100][ T21] ? retint_kernel+0x10/0x10 [ 26.342666][ T21] ? trace_hardirqs_on+0x55/0x1e0 [ 26.347860][ T21] ? __mutex_lock+0xf23/0x1360 [ 26.352666][ T21] end_report+0x43/0x49 [ 26.356808][ T21] ? __mutex_lock+0xf23/0x1360 [ 26.361553][ T21] __kasan_report.cold+0xd/0x33 [ 26.366392][ T21] ? __mutex_lock+0xf23/0x1360 [ 26.371264][ T21] kasan_report+0xe/0x12 [ 26.375486][ T21] __mutex_lock+0xf23/0x1360 [ 26.380059][ T21] ? device_release_driver_internal+0x23/0x4c0 [ 26.386190][ T21] ? mark_held_locks+0x9f/0xe0 [ 26.390930][ T21] ? lockdep_hardirqs_on+0x379/0x580 [ 26.396309][ T21] ? mutex_trylock+0x2c0/0x2c0 [ 26.401048][ T21] ? lockdep_hardirqs_on+0x379/0x580 [ 26.406313][ T21] ? __kasan_slab_free+0x145/0x180 [ 26.411798][ T21] ? kfree_const+0x51/0x60 [ 26.416191][ T21] ? kfree+0xe4/0x2f0 [ 26.420153][ T21] ? device_remove_bin_file+0x30/0x30 [ 26.425499][ T21] ? device_release_driver_internal+0x23/0x4c0 [ 26.431686][ T21] device_release_driver_internal+0x23/0x4c0 [ 26.437644][ T21] bus_remove_device+0x2dc/0x4a0 [ 26.442559][ T21] device_del+0x420/0xb10 [ 26.446861][ T21] ? __device_links_no_driver+0x240/0x240 [ 26.452566][ T21] ? usb_remove_ep_devs+0x3e/0x80 [ 26.457565][ T21] ? remove_intf_ep_devs+0x13f/0x1d0 [ 26.462823][ T21] usb_disable_device+0x211/0x690 [ 26.467919][ T21] usb_disconnect+0x284/0x8d0 [ 26.472571][ T21] hub_event+0x1454/0x3640 [ 26.476973][ T21] ? find_held_lock+0x2d/0x110 [ 26.481726][ T21] ? mark_held_locks+0xe0/0xe0 [ 26.486502][ T21] ? hub_port_debounce+0x260/0x260 [ 26.491610][ T21] process_one_work+0x92b/0x1530 [ 26.496519][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 26.501905][ T21] ? do_raw_spin_lock+0x11a/0x280 [ 26.506960][ T21] worker_thread+0x96/0xe20 [ 26.511526][ T21] ? process_one_work+0x1530/0x1530 [ 26.516707][ T21] kthread+0x318/0x420 [ 26.520782][ T21] ? kthread_create_on_node+0xf0/0xf0 [ 26.526128][ T21] ret_from_fork+0x24/0x30 [ 26.530996][ T21] Kernel Offset: disabled [ 26.535310][ T21] Rebooting in 86400 seconds..