Warning: Permanently added '10.128.0.217' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.321184][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 25.561102][ T12] usb 1-1: Using ep0 maxpacket: 8 [ 25.681243][ T12] usb 1-1: New USB device found, idVendor=0b95, idProduct=172a, bcdDevice=dc.dc [ 25.690378][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 25.699763][ T12] usb 1-1: config 0 descriptor?? [ 25.951245][ T12] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read MAC address: 0 [ 25.963980][ T12] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet, 66:6d:46:db:1e:51 executing program [ 26.152995][ T22] usb 1-1: USB disconnect, device number 2 [ 26.159580][ T22] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet [ 26.221593][ T22] ================================================================== [ 26.229752][ T22] BUG: KASAN: use-after-free in ax88172a_unbind+0x76/0xed [ 26.236884][ T22] Read of size 8 at addr ffff8881d22b6f80 by task kworker/1:1/22 [ 26.244569][ T22] [ 26.246916][ T22] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.5.0-rc2-syzkaller #0 [ 26.255041][ T22] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.265134][ T22] Workqueue: usb_hub_wq hub_event [ 26.270150][ T22] Call Trace: [ 26.273420][ T22] dump_stack+0xef/0x16e [ 26.277639][ T22] ? ax88172a_unbind+0x76/0xed [ 26.282403][ T22] ? ax88172a_unbind+0x76/0xed [ 26.287146][ T22] print_address_description.constprop.0+0x16/0x200 [ 26.293710][ T22] ? ax88172a_unbind+0x76/0xed [ 26.298464][ T22] ? ax88172a_unbind+0x76/0xed [ 26.303216][ T22] __kasan_report.cold+0x37/0x7f [ 26.308147][ T22] ? mark_lock+0x1160/0x1160 [ 26.312723][ T22] ? ax88172a_unbind+0x76/0xed [ 26.317473][ T22] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 26.322773][ T22] kasan_report+0xe/0x20 [ 26.327011][ T22] ax88172a_unbind+0x76/0xed [ 26.331602][ T22] usbnet_disconnect+0x145/0x270 [ 26.336519][ T22] usb_unbind_interface+0x1bd/0x8a0 [ 26.341697][ T22] ? usb_autoresume_device+0x60/0x60 [ 26.346962][ T22] device_release_driver_internal+0x42f/0x500 [ 26.353007][ T22] bus_remove_device+0x2dc/0x4a0 [ 26.357932][ T22] device_del+0x481/0xd30 [ 26.362235][ T22] ? device_create_with_groups+0x120/0x120 [ 26.368032][ T22] ? lockdep_hardirqs_on+0x382/0x580 [ 26.373308][ T22] ? remove_intf_ep_devs+0x13f/0x1d0 [ 26.378634][ T22] usb_disable_device+0x211/0x690 [ 26.383644][ T22] usb_disconnect+0x284/0x8d0 [ 26.388328][ T22] hub_event+0x1753/0x3860 [ 26.392725][ T22] ? hub_port_debounce+0x260/0x260 [ 26.397824][ T22] ? find_held_lock+0x2d/0x110 [ 26.402568][ T22] ? mark_held_locks+0xe0/0xe0 [ 26.407325][ T22] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 26.412859][ T22] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 26.418133][ T22] process_one_work+0x92b/0x1530 [ 26.423049][ T22] ? pwq_dec_nr_in_flight+0x310/0x310 [ 26.428401][ T22] ? do_raw_spin_lock+0x11a/0x280 [ 26.433402][ T22] worker_thread+0x96/0xe20 [ 26.437984][ T22] ? process_one_work+0x1530/0x1530 [ 26.443191][ T22] kthread+0x318/0x420 [ 26.447264][ T22] ? kthread_create_on_node+0xf0/0xf0 [ 26.452676][ T22] ret_from_fork+0x24/0x30 [ 26.457073][ T22] [ 26.459382][ T22] Allocated by task 12: [ 26.463518][ T22] save_stack+0x1b/0x80 [ 26.467653][ T22] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 26.473292][ T22] ax88172a_bind+0x9f/0x7a2 [ 26.477780][ T22] usbnet_probe+0xb43/0x2470 [ 26.482361][ T22] usb_probe_interface+0x305/0x7a0 [ 26.487463][ T22] really_probe+0x281/0x6d0 [ 26.491942][ T22] driver_probe_device+0x104/0x210 [ 26.497028][ T22] __device_attach_driver+0x1c2/0x220 [ 26.502377][ T22] bus_for_each_drv+0x162/0x1e0 [ 26.507200][ T22] __device_attach+0x217/0x360 [ 26.511941][ T22] bus_probe_device+0x1e4/0x290 [ 26.516776][ T22] device_add+0x1480/0x1c20 [ 26.521265][ T22] usb_set_configuration+0xe67/0x1740 [ 26.526613][ T22] generic_probe+0x9d/0xd5 [ 26.531011][ T22] usb_probe_device+0x99/0x100 [ 26.535771][ T22] really_probe+0x281/0x6d0 [ 26.540248][ T22] driver_probe_device+0x104/0x210 [ 26.545352][ T22] __device_attach_driver+0x1c2/0x220 [ 26.550697][ T22] bus_for_each_drv+0x162/0x1e0 [ 26.555522][ T22] __device_attach+0x217/0x360 [ 26.560262][ T22] bus_probe_device+0x1e4/0x290 [ 26.565211][ T22] device_add+0x1480/0x1c20 [ 26.569699][ T22] usb_new_device.cold+0x6a4/0xe79 [ 26.574789][ T22] hub_event+0x1e59/0x3860 [ 26.579197][ T22] process_one_work+0x92b/0x1530 [ 26.584124][ T22] worker_thread+0x96/0xe20 [ 26.588611][ T22] kthread+0x318/0x420 [ 26.592657][ T22] ret_from_fork+0x24/0x30 [ 26.597043][ T22] [ 26.599344][ T22] Freed by task 12: [ 26.603129][ T22] save_stack+0x1b/0x80 [ 26.607260][ T22] __kasan_slab_free+0x129/0x170 [ 26.612183][ T22] kfree+0xda/0x310 [ 26.615966][ T22] ax88172a_bind.cold+0x4d/0x1e8 [ 26.620889][ T22] usbnet_probe+0xb43/0x2470 [ 26.625459][ T22] usb_probe_interface+0x305/0x7a0 [ 26.630544][ T22] really_probe+0x281/0x6d0 [ 26.635026][ T22] driver_probe_device+0x104/0x210 [ 26.640134][ T22] __device_attach_driver+0x1c2/0x220 [ 26.645500][ T22] bus_for_each_drv+0x162/0x1e0 [ 26.650332][ T22] __device_attach+0x217/0x360 [ 26.655095][ T22] bus_probe_device+0x1e4/0x290 [ 26.659930][ T22] device_add+0x1480/0x1c20 [ 26.664423][ T22] usb_set_configuration+0xe67/0x1740 [ 26.669953][ T22] generic_probe+0x9d/0xd5 [ 26.674346][ T22] usb_probe_device+0x99/0x100 [ 26.679086][ T22] really_probe+0x281/0x6d0 [ 26.683564][ T22] driver_probe_device+0x104/0x210 [ 26.688654][ T22] __device_attach_driver+0x1c2/0x220 [ 26.694004][ T22] bus_for_each_drv+0x162/0x1e0 [ 26.698840][ T22] __device_attach+0x217/0x360 [ 26.703651][ T22] bus_probe_device+0x1e4/0x290 [ 26.708493][ T22] device_add+0x1480/0x1c20 [ 26.712988][ T22] usb_new_device.cold+0x6a4/0xe79 [ 26.718096][ T22] hub_event+0x1e59/0x3860 [ 26.722503][ T22] process_one_work+0x92b/0x1530 [ 26.727425][ T22] worker_thread+0x96/0xe20 [ 26.731924][ T22] kthread+0x318/0x420 [ 26.736033][ T22] ret_from_fork+0x24/0x30 [ 26.740421][ T22] [ 26.742731][ T22] The buggy address belongs to the object at ffff8881d22b6f80 [ 26.742731][ T22] which belongs to the cache kmalloc-64 of size 64 [ 26.756617][ T22] The buggy address is located 0 bytes inside of [ 26.756617][ T22] 64-byte region [ffff8881d22b6f80, ffff8881d22b6fc0) [ 26.769610][ T22] The buggy address belongs to the page: [ 26.775235][ T22] page:ffffea000748ad80 refcount:1 mapcount:0 mapping:ffff8881da003180 index:0x0 [ 26.784334][ T22] raw: 0200000000000200 ffffea00074da500 0000001500000015 ffff8881da003180 [ 26.792907][ T22] raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 [ 26.801476][ T22] page dumped because: kasan: bad access detected [ 26.807974][ T22] [ 26.810275][ T22] Memory state around the buggy address: [ 26.815895][ T22] ffff8881d22b6e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.823958][ T22] ffff8881d22b6f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.832007][ T22] >ffff8881d22b6f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.840051][ T22] ^ [ 26.844103][ T22] ffff8881d22b7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 26.852154][ T22] ffff8881d22b7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 26.860201][ T22] ================================================================== [ 26.868240][ T22] Disabling lock debugging due to kernel taint [ 26.874573][ T22] Kernel panic - not syncing: panic_on_warn set ... [ 26.881177][ T22] CPU: 1 PID: 22 Comm: kworker/1:1 Tainted: G B 5.5.0-rc2-syzkaller #0 [ 26.890880][ T22] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.900935][ T22] Workqueue: usb_hub_wq hub_event [ 26.905945][ T22] Call Trace: [ 26.909232][ T22] dump_stack+0xef/0x16e [ 26.913472][ T22] panic+0x2aa/0x6e1 [ 26.917363][ T22] ? add_taint.cold+0x16/0x16 [ 26.922030][ T22] ? ax88172a_unbind+0x76/0xed [ 26.926792][ T22] ? trace_hardirqs_on+0x55/0x1e0 [ 26.931965][ T22] ? ax88172a_unbind+0x76/0xed [ 26.936731][ T22] end_report+0x43/0x49 [ 26.940889][ T22] ? ax88172a_unbind+0x76/0xed [ 26.945646][ T22] __kasan_report.cold+0x55/0x7f [ 26.950607][ T22] ? mark_lock+0x1160/0x1160 [ 26.955197][ T22] ? ax88172a_unbind+0x76/0xed [ 26.959987][ T22] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 26.965176][ T22] kasan_report+0xe/0x20 [ 26.969513][ T22] ax88172a_unbind+0x76/0xed [ 26.974103][ T22] usbnet_disconnect+0x145/0x270 [ 26.979038][ T22] usb_unbind_interface+0x1bd/0x8a0 [ 26.984276][ T22] ? usb_autoresume_device+0x60/0x60 [ 26.989602][ T22] device_release_driver_internal+0x42f/0x500 [ 26.995682][ T22] bus_remove_device+0x2dc/0x4a0 [ 27.000613][ T22] device_del+0x481/0xd30 [ 27.004930][ T22] ? device_create_with_groups+0x120/0x120 [ 27.010728][ T22] ? lockdep_hardirqs_on+0x382/0x580 [ 27.016009][ T22] ? remove_intf_ep_devs+0x13f/0x1d0 [ 27.021282][ T22] usb_disable_device+0x211/0x690 [ 27.026314][ T22] usb_disconnect+0x284/0x8d0 [ 27.030987][ T22] hub_event+0x1753/0x3860 [ 27.035405][ T22] ? hub_port_debounce+0x260/0x260 [ 27.040505][ T22] ? find_held_lock+0x2d/0x110 [ 27.045252][ T22] ? mark_held_locks+0xe0/0xe0 [ 27.049996][ T22] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 27.055866][ T22] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 27.061127][ T22] process_one_work+0x92b/0x1530 [ 27.066100][ T22] ? pwq_dec_nr_in_flight+0x310/0x310 [ 27.071449][ T22] ? do_raw_spin_lock+0x11a/0x280 [ 27.076454][ T22] worker_thread+0x96/0xe20 [ 27.080939][ T22] ? process_one_work+0x1530/0x1530 [ 27.086112][ T22] kthread+0x318/0x420 [ 27.090165][ T22] ? kthread_create_on_node+0xf0/0xf0 [ 27.095525][ T22] ret_from_fork+0x24/0x30 [ 27.100571][ T22] Kernel Offset: disabled [ 27.104902][ T22] Rebooting in 86400 seconds..