INIT: Entering runlevel: 2 [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 '10.128.0.80' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 45.694711][ T22] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 46.054743][ T22] usb 1-1: New USB device found, idVendor=0b95, idProduct=172a, bcdDevice=9b.e9 [ 46.063905][ T22] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 46.073673][ T22] usb 1-1: config 0 descriptor?? [ 46.334760][ T22] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read MAC address: 0 [ 46.347659][ T22] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet, 02:73:90:14:79:79 executing program [ 46.539711][ T102] usb 1-1: USB disconnect, device number 2 [ 46.546266][ T102] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet [ 46.615310][ T102] ================================================================== [ 46.623511][ T102] BUG: KASAN: use-after-free in ax88172a_unbind+0x76/0xed [ 46.630704][ T102] Read of size 8 at addr ffff8881cf46d280 by task kworker/0:2/102 [ 46.638576][ T102] [ 46.640891][ T102] CPU: 0 PID: 102 Comm: kworker/0:2 Not tainted 5.5.0-rc1-syzkaller #0 [ 46.649118][ T102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.659266][ T102] Workqueue: usb_hub_wq hub_event [ 46.664352][ T102] Call Trace: [ 46.668351][ T102] dump_stack+0xef/0x16e [ 46.672583][ T102] ? ax88172a_unbind+0x76/0xed [ 46.677328][ T102] ? ax88172a_unbind+0x76/0xed [ 46.682072][ T102] print_address_description.constprop.0+0x16/0x200 [ 46.688637][ T102] ? ax88172a_unbind+0x76/0xed [ 46.693476][ T102] ? ax88172a_unbind+0x76/0xed [ 46.698236][ T102] __kasan_report.cold+0x37/0x7f [ 46.703166][ T102] ? mark_lock+0x1160/0x1160 [ 46.707760][ T102] ? ax88172a_unbind+0x76/0xed [ 46.712594][ T102] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 46.717774][ T102] kasan_report+0xe/0x20 [ 46.722009][ T102] ax88172a_unbind+0x76/0xed [ 46.726580][ T102] usbnet_disconnect+0x145/0x270 [ 46.731499][ T102] usb_unbind_interface+0x1bd/0x8a0 [ 46.736675][ T102] ? usb_autoresume_device+0x60/0x60 [ 46.741948][ T102] device_release_driver_internal+0x42f/0x500 [ 46.748019][ T102] bus_remove_device+0x2dc/0x4a0 [ 46.752945][ T102] device_del+0x481/0xd30 [ 46.757253][ T102] ? device_create_with_groups+0x120/0x120 [ 46.763056][ T102] ? lockdep_hardirqs_on+0x382/0x580 [ 46.768318][ T102] ? remove_intf_ep_devs+0x13f/0x1d0 [ 46.773621][ T102] usb_disable_device+0x211/0x690 [ 46.778644][ T102] usb_disconnect+0x284/0x8d0 [ 46.783406][ T102] hub_event+0x1753/0x3860 [ 46.787818][ T102] ? hub_port_debounce+0x260/0x260 [ 46.793087][ T102] ? find_held_lock+0x2d/0x110 [ 46.797843][ T102] ? mark_held_locks+0xe0/0xe0 [ 46.802617][ T102] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 46.808163][ T102] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 46.813626][ T102] process_one_work+0x92b/0x1530 [ 46.818721][ T102] ? pwq_dec_nr_in_flight+0x310/0x310 [ 46.824254][ T102] ? do_raw_spin_lock+0x11a/0x280 [ 46.829263][ T102] worker_thread+0x96/0xe20 [ 46.833749][ T102] ? process_one_work+0x1530/0x1530 [ 46.838934][ T102] kthread+0x318/0x420 [ 46.842992][ T102] ? kthread_create_on_node+0xf0/0xf0 [ 46.848347][ T102] ret_from_fork+0x24/0x30 [ 46.852748][ T102] [ 46.855071][ T102] Allocated by task 22: [ 46.859207][ T102] save_stack+0x1b/0x80 [ 46.863341][ T102] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 46.869056][ T102] ax88172a_bind+0x9f/0x7a2 [ 46.873535][ T102] usbnet_probe+0xb43/0x2470 [ 46.878102][ T102] usb_probe_interface+0x305/0x7a0 [ 46.883194][ T102] really_probe+0x281/0x6d0 [ 46.887684][ T102] driver_probe_device+0x104/0x210 [ 46.892795][ T102] __device_attach_driver+0x1c2/0x220 [ 46.898163][ T102] bus_for_each_drv+0x162/0x1e0 [ 46.903007][ T102] __device_attach+0x217/0x360 [ 46.907766][ T102] bus_probe_device+0x1e4/0x290 [ 46.912732][ T102] device_add+0x1480/0x1c20 [ 46.917218][ T102] usb_set_configuration+0xe67/0x1740 [ 46.922582][ T102] generic_probe+0x9d/0xd5 [ 46.927097][ T102] usb_probe_device+0x99/0x100 [ 46.931846][ T102] really_probe+0x281/0x6d0 [ 46.936331][ T102] driver_probe_device+0x104/0x210 [ 46.941428][ T102] __device_attach_driver+0x1c2/0x220 [ 46.946787][ T102] bus_for_each_drv+0x162/0x1e0 [ 46.951779][ T102] __device_attach+0x217/0x360 [ 46.956545][ T102] bus_probe_device+0x1e4/0x290 [ 46.961414][ T102] device_add+0x1480/0x1c20 [ 46.966182][ T102] usb_new_device.cold+0x6a4/0xe79 [ 46.971898][ T102] hub_event+0x1e59/0x3860 [ 46.976312][ T102] process_one_work+0x92b/0x1530 [ 46.981245][ T102] worker_thread+0x96/0xe20 [ 46.985955][ T102] kthread+0x318/0x420 [ 46.990015][ T102] ret_from_fork+0x24/0x30 [ 46.994444][ T102] [ 46.996771][ T102] Freed by task 22: [ 47.000605][ T102] save_stack+0x1b/0x80 [ 47.004739][ T102] __kasan_slab_free+0x129/0x170 [ 47.009664][ T102] kfree+0xda/0x310 [ 47.013453][ T102] ax88172a_bind.cold+0x4d/0x1e8 [ 47.018456][ T102] usbnet_probe+0xb43/0x2470 [ 47.023027][ T102] usb_probe_interface+0x305/0x7a0 [ 47.028119][ T102] really_probe+0x281/0x6d0 [ 47.032617][ T102] driver_probe_device+0x104/0x210 [ 47.037815][ T102] __device_attach_driver+0x1c2/0x220 [ 47.043283][ T102] bus_for_each_drv+0x162/0x1e0 [ 47.048140][ T102] __device_attach+0x217/0x360 [ 47.052889][ T102] bus_probe_device+0x1e4/0x290 [ 47.057721][ T102] device_add+0x1480/0x1c20 [ 47.063167][ T102] usb_set_configuration+0xe67/0x1740 [ 47.068525][ T102] generic_probe+0x9d/0xd5 [ 47.072930][ T102] usb_probe_device+0x99/0x100 [ 47.077696][ T102] really_probe+0x281/0x6d0 [ 47.082288][ T102] driver_probe_device+0x104/0x210 [ 47.087474][ T102] __device_attach_driver+0x1c2/0x220 [ 47.092839][ T102] bus_for_each_drv+0x162/0x1e0 [ 47.097680][ T102] __device_attach+0x217/0x360 [ 47.102427][ T102] bus_probe_device+0x1e4/0x290 [ 47.107268][ T102] device_add+0x1480/0x1c20 [ 47.111762][ T102] usb_new_device.cold+0x6a4/0xe79 [ 47.116854][ T102] hub_event+0x1e59/0x3860 [ 47.121253][ T102] process_one_work+0x92b/0x1530 [ 47.126168][ T102] worker_thread+0x96/0xe20 [ 47.130649][ T102] kthread+0x318/0x420 [ 47.134707][ T102] ret_from_fork+0x24/0x30 [ 47.139100][ T102] [ 47.141412][ T102] The buggy address belongs to the object at ffff8881cf46d280 [ 47.141412][ T102] which belongs to the cache kmalloc-64 of size 64 [ 47.155359][ T102] The buggy address is located 0 bytes inside of [ 47.155359][ T102] 64-byte region [ffff8881cf46d280, ffff8881cf46d2c0) [ 47.168467][ T102] The buggy address belongs to the page: [ 47.174095][ T102] page:ffffea00073d1b40 refcount:1 mapcount:0 mapping:ffff8881da003180 index:0xffff8881cf46dc80 [ 47.184496][ T102] raw: 0200000000000200 ffffea00074d6340 0000000a00000003 ffff8881da003180 [ 47.193072][ T102] raw: ffff8881cf46dc80 0000000080200015 00000001ffffffff 0000000000000000 [ 47.201677][ T102] page dumped because: kasan: bad access detected [ 47.208128][ T102] [ 47.210474][ T102] Memory state around the buggy address: [ 47.216184][ T102] ffff8881cf46d180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 47.224253][ T102] ffff8881cf46d200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 47.232312][ T102] >ffff8881cf46d280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 47.240356][ T102] ^ [ 47.244418][ T102] ffff8881cf46d300: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 47.252460][ T102] ffff8881cf46d380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 47.260508][ T102] ================================================================== [ 47.268545][ T102] Disabling lock debugging due to kernel taint [ 47.274759][ T102] Kernel panic - not syncing: panic_on_warn set ... [ 47.281351][ T102] CPU: 0 PID: 102 Comm: kworker/0:2 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 47.291072][ T102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.301238][ T102] Workqueue: usb_hub_wq hub_event [ 47.306249][ T102] Call Trace: [ 47.309532][ T102] dump_stack+0xef/0x16e [ 47.313760][ T102] panic+0x2aa/0x6e1 [ 47.317646][ T102] ? add_taint.cold+0x16/0x16 [ 47.322309][ T102] ? ax88172a_unbind+0x76/0xed [ 47.327070][ T102] ? trace_hardirqs_on+0x55/0x1e0 [ 47.332132][ T102] ? ax88172a_unbind+0x76/0xed [ 47.337125][ T102] end_report+0x43/0x49 [ 47.341263][ T102] ? ax88172a_unbind+0x76/0xed [ 47.346007][ T102] __kasan_report.cold+0x55/0x7f [ 47.350929][ T102] ? mark_lock+0x1160/0x1160 [ 47.355497][ T102] ? ax88172a_unbind+0x76/0xed [ 47.360245][ T102] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 47.365421][ T102] kasan_report+0xe/0x20 [ 47.369662][ T102] ax88172a_unbind+0x76/0xed [ 47.374240][ T102] usbnet_disconnect+0x145/0x270 [ 47.379175][ T102] usb_unbind_interface+0x1bd/0x8a0 [ 47.384370][ T102] ? usb_autoresume_device+0x60/0x60 [ 47.389643][ T102] device_release_driver_internal+0x42f/0x500 [ 47.395692][ T102] bus_remove_device+0x2dc/0x4a0 [ 47.400607][ T102] device_del+0x481/0xd30 [ 47.404948][ T102] ? device_create_with_groups+0x120/0x120 [ 47.410730][ T102] ? lockdep_hardirqs_on+0x382/0x580 [ 47.416039][ T102] ? remove_intf_ep_devs+0x13f/0x1d0 [ 47.421303][ T102] usb_disable_device+0x211/0x690 [ 47.426426][ T102] usb_disconnect+0x284/0x8d0 [ 47.431539][ T102] hub_event+0x1753/0x3860 [ 47.435940][ T102] ? hub_port_debounce+0x260/0x260 [ 47.441044][ T102] ? find_held_lock+0x2d/0x110 [ 47.445791][ T102] ? mark_held_locks+0xe0/0xe0 [ 47.450531][ T102] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 47.456063][ T102] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 47.461329][ T102] process_one_work+0x92b/0x1530 [ 47.466260][ T102] ? pwq_dec_nr_in_flight+0x310/0x310 [ 47.471612][ T102] ? do_raw_spin_lock+0x11a/0x280 [ 47.476617][ T102] worker_thread+0x96/0xe20 [ 47.481316][ T102] ? process_one_work+0x1530/0x1530 [ 47.486509][ T102] kthread+0x318/0x420 [ 47.490573][ T102] ? kthread_create_on_node+0xf0/0xf0 [ 47.495925][ T102] ret_from_fork+0x24/0x30 [ 47.500835][ T102] Kernel Offset: disabled [ 47.505154][ T102] Rebooting in 86400 seconds..