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 '10.128.0.159' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.835141][ T94] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 25.075077][ T94] usb 1-1: Using ep0 maxpacket: 8 [ 25.195236][ T94] usb 1-1: New USB device found, idVendor=0b95, idProduct=172a, bcdDevice=dc.dc [ 25.204350][ T94] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 25.213706][ T94] usb 1-1: config 0 descriptor?? [ 25.475185][ T94] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read MAC address: 0 [ 25.487808][ T94] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet, be:5d:6f:6c:1e:83 executing program [ 25.676669][ T94] usb 1-1: USB disconnect, device number 2 [ 25.683185][ T94] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet [ 25.736576][ T94] ================================================================== [ 25.744875][ T94] BUG: KASAN: use-after-free in ax88172a_unbind+0x76/0xed [ 25.751965][ T94] Read of size 8 at addr ffff8881d1d71880 by task kworker/1:2/94 [ 25.759669][ T94] [ 25.761983][ T94] CPU: 1 PID: 94 Comm: kworker/1:2 Not tainted 5.5.0-rc3-syzkaller #0 [ 25.770278][ T94] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.780317][ T94] Workqueue: usb_hub_wq hub_event [ 25.785315][ T94] Call Trace: [ 25.788582][ T94] dump_stack+0xef/0x16e [ 25.792805][ T94] ? ax88172a_unbind+0x76/0xed [ 25.797547][ T94] ? ax88172a_unbind+0x76/0xed [ 25.802301][ T94] print_address_description.constprop.0+0x16/0x200 [ 25.808866][ T94] ? ax88172a_unbind+0x76/0xed [ 25.813608][ T94] ? ax88172a_unbind+0x76/0xed [ 25.818360][ T94] __kasan_report.cold+0x37/0x7f [ 25.823276][ T94] ? mark_held_locks+0x70/0xe0 [ 25.828019][ T94] ? ax88172a_unbind+0x76/0xed [ 25.832767][ T94] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 25.837940][ T94] kasan_report+0xe/0x20 [ 25.842161][ T94] ax88172a_unbind+0x76/0xed [ 25.846730][ T94] usbnet_disconnect+0x145/0x270 [ 25.851654][ T94] usb_unbind_interface+0x1bd/0x8a0 [ 25.856831][ T94] ? usb_autoresume_device+0x60/0x60 [ 25.862094][ T94] device_release_driver_internal+0x42f/0x500 [ 25.868138][ T94] bus_remove_device+0x2dc/0x4a0 [ 25.873056][ T94] device_del+0x481/0xd30 [ 25.877365][ T94] ? device_create_with_groups+0x120/0x120 [ 25.883148][ T94] ? lockdep_hardirqs_on+0x382/0x580 [ 25.888413][ T94] ? remove_intf_ep_devs+0x13f/0x1d0 [ 25.893676][ T94] usb_disable_device+0x211/0x690 [ 25.898679][ T94] usb_disconnect+0x284/0x8d0 [ 25.903333][ T94] hub_event+0x1753/0x3860 [ 25.907730][ T94] ? hub_port_debounce+0x260/0x260 [ 25.912822][ T94] ? find_held_lock+0x2d/0x110 [ 25.917565][ T94] ? mark_held_locks+0xe0/0xe0 [ 25.922320][ T94] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 25.927858][ T94] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 25.933124][ T94] process_one_work+0x92b/0x1530 [ 25.938040][ T94] ? pwq_dec_nr_in_flight+0x310/0x310 [ 25.943389][ T94] ? do_raw_spin_lock+0x129/0x290 [ 25.948392][ T94] worker_thread+0x96/0xe20 [ 25.952884][ T94] ? process_one_work+0x1530/0x1530 [ 25.958063][ T94] kthread+0x318/0x420 [ 25.962114][ T94] ? kthread_create_on_node+0xf0/0xf0 [ 25.967476][ T94] ret_from_fork+0x24/0x30 [ 25.971863][ T94] [ 25.974171][ T94] Allocated by task 94: [ 25.978309][ T94] save_stack+0x1b/0x80 [ 25.982461][ T94] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 25.988086][ T94] ax88172a_bind+0x9f/0x7a2 [ 25.992572][ T94] usbnet_probe+0xb43/0x2470 [ 25.997144][ T94] usb_probe_interface+0x305/0x7a0 [ 26.002235][ T94] really_probe+0x281/0x6d0 [ 26.006721][ T94] driver_probe_device+0x104/0x210 [ 26.011815][ T94] __device_attach_driver+0x1c2/0x220 [ 26.017168][ T94] bus_for_each_drv+0x162/0x1e0 [ 26.022186][ T94] __device_attach+0x217/0x360 [ 26.026928][ T94] bus_probe_device+0x1e4/0x290 [ 26.031767][ T94] device_add+0x141f/0x1bc0 [ 26.036259][ T94] usb_set_configuration+0xe38/0x16c0 [ 26.041611][ T94] generic_probe+0x9d/0xd5 [ 26.046009][ T94] usb_probe_device+0x99/0x100 [ 26.050774][ T94] really_probe+0x281/0x6d0 [ 26.055264][ T94] driver_probe_device+0x104/0x210 [ 26.060357][ T94] __device_attach_driver+0x1c2/0x220 [ 26.065723][ T94] bus_for_each_drv+0x162/0x1e0 [ 26.070556][ T94] __device_attach+0x217/0x360 [ 26.075311][ T94] bus_probe_device+0x1e4/0x290 [ 26.080143][ T94] device_add+0x141f/0x1bc0 [ 26.084633][ T94] usb_new_device.cold+0x6a4/0xe79 [ 26.089731][ T94] hub_event+0x1e59/0x3860 [ 26.094128][ T94] process_one_work+0x92b/0x1530 [ 26.099050][ T94] worker_thread+0x96/0xe20 [ 26.103532][ T94] kthread+0x318/0x420 [ 26.107581][ T94] ret_from_fork+0x24/0x30 [ 26.111968][ T94] [ 26.114273][ T94] Freed by task 94: [ 26.118062][ T94] save_stack+0x1b/0x80 [ 26.122193][ T94] __kasan_slab_free+0x129/0x170 [ 26.127119][ T94] kfree+0xda/0x310 [ 26.130915][ T94] ax88172a_bind.cold+0x4d/0x1e8 [ 26.135829][ T94] usbnet_probe+0xb43/0x2470 [ 26.140412][ T94] usb_probe_interface+0x305/0x7a0 [ 26.145513][ T94] really_probe+0x281/0x6d0 [ 26.150000][ T94] driver_probe_device+0x104/0x210 [ 26.155092][ T94] __device_attach_driver+0x1c2/0x220 [ 26.160458][ T94] bus_for_each_drv+0x162/0x1e0 [ 26.165298][ T94] __device_attach+0x217/0x360 [ 26.170043][ T94] bus_probe_device+0x1e4/0x290 [ 26.174887][ T94] device_add+0x141f/0x1bc0 [ 26.179380][ T94] usb_set_configuration+0xe38/0x16c0 [ 26.184737][ T94] generic_probe+0x9d/0xd5 [ 26.189137][ T94] usb_probe_device+0x99/0x100 [ 26.193913][ T94] really_probe+0x281/0x6d0 [ 26.198395][ T94] driver_probe_device+0x104/0x210 [ 26.203485][ T94] __device_attach_driver+0x1c2/0x220 [ 26.208844][ T94] bus_for_each_drv+0x162/0x1e0 [ 26.213679][ T94] __device_attach+0x217/0x360 [ 26.218421][ T94] bus_probe_device+0x1e4/0x290 [ 26.223249][ T94] device_add+0x141f/0x1bc0 [ 26.227727][ T94] usb_new_device.cold+0x6a4/0xe79 [ 26.232826][ T94] hub_event+0x1e59/0x3860 [ 26.237223][ T94] process_one_work+0x92b/0x1530 [ 26.242137][ T94] worker_thread+0x96/0xe20 [ 26.246617][ T94] kthread+0x318/0x420 [ 26.250663][ T94] ret_from_fork+0x24/0x30 [ 26.255057][ T94] [ 26.257375][ T94] The buggy address belongs to the object at ffff8881d1d71880 [ 26.257375][ T94] which belongs to the cache kmalloc-64 of size 64 [ 26.271762][ T94] The buggy address is located 0 bytes inside of [ 26.271762][ T94] 64-byte region [ffff8881d1d71880, ffff8881d1d718c0) [ 26.284759][ T94] The buggy address belongs to the page: [ 26.290383][ T94] page:ffffea0007475c40 refcount:1 mapcount:0 mapping:ffff8881da403180 index:0x0 [ 26.299586][ T94] raw: 0200000000000200 ffffea0007486980 0000001400000014 ffff8881da403180 [ 26.308247][ T94] raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000 [ 26.316833][ T94] page dumped because: kasan: bad access detected [ 26.323225][ T94] [ 26.325544][ T94] Memory state around the buggy address: [ 26.331159][ T94] ffff8881d1d71780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.339207][ T94] ffff8881d1d71800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.347244][ T94] >ffff8881d1d71880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.355279][ T94] ^ [ 26.359323][ T94] ffff8881d1d71900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.367362][ T94] ffff8881d1d71980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 26.375398][ T94] ================================================================== [ 26.383431][ T94] Disabling lock debugging due to kernel taint [ 26.389893][ T94] Kernel panic - not syncing: panic_on_warn set ... [ 26.396479][ T94] CPU: 1 PID: 94 Comm: kworker/1:2 Tainted: G B 5.5.0-rc3-syzkaller #0 [ 26.406043][ T94] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.416082][ T94] Workqueue: usb_hub_wq hub_event [ 26.421117][ T94] Call Trace: [ 26.424400][ T94] dump_stack+0xef/0x16e [ 26.428619][ T94] panic+0x2aa/0x6e1 [ 26.432487][ T94] ? add_taint.cold+0x16/0x16 [ 26.437194][ T94] ? ax88172a_unbind+0x76/0xed [ 26.441973][ T94] ? trace_hardirqs_on+0x55/0x1e0 [ 26.447019][ T94] ? ax88172a_unbind+0x76/0xed [ 26.451765][ T94] end_report+0x43/0x49 [ 26.455896][ T94] ? ax88172a_unbind+0x76/0xed [ 26.460688][ T94] __kasan_report.cold+0x55/0x7f [ 26.465600][ T94] ? mark_held_locks+0x70/0xe0 [ 26.470336][ T94] ? ax88172a_unbind+0x76/0xed [ 26.475075][ T94] ? ax88172a_bind.cold+0x1e8/0x1e8 [ 26.480246][ T94] kasan_report+0xe/0x20 [ 26.484460][ T94] ax88172a_unbind+0x76/0xed [ 26.489025][ T94] usbnet_disconnect+0x145/0x270 [ 26.493937][ T94] usb_unbind_interface+0x1bd/0x8a0 [ 26.499115][ T94] ? usb_autoresume_device+0x60/0x60 [ 26.504374][ T94] device_release_driver_internal+0x42f/0x500 [ 26.510471][ T94] bus_remove_device+0x2dc/0x4a0 [ 26.515383][ T94] device_del+0x481/0xd30 [ 26.520036][ T94] ? device_create_with_groups+0x120/0x120 [ 26.525825][ T94] ? lockdep_hardirqs_on+0x382/0x580 [ 26.531093][ T94] ? remove_intf_ep_devs+0x13f/0x1d0 [ 26.536410][ T94] usb_disable_device+0x211/0x690 [ 26.541412][ T94] usb_disconnect+0x284/0x8d0 [ 26.546101][ T94] hub_event+0x1753/0x3860 [ 26.550504][ T94] ? hub_port_debounce+0x260/0x260 [ 26.555717][ T94] ? find_held_lock+0x2d/0x110 [ 26.560460][ T94] ? mark_held_locks+0xe0/0xe0 [ 26.565211][ T94] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 26.570730][ T94] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 26.575987][ T94] process_one_work+0x92b/0x1530 [ 26.580954][ T94] ? pwq_dec_nr_in_flight+0x310/0x310 [ 26.586316][ T94] ? do_raw_spin_lock+0x129/0x290 [ 26.591320][ T94] worker_thread+0x96/0xe20 [ 26.596062][ T94] ? process_one_work+0x1530/0x1530 [ 26.601236][ T94] kthread+0x318/0x420 [ 26.605281][ T94] ? kthread_create_on_node+0xf0/0xf0 [ 26.610635][ T94] ret_from_fork+0x24/0x30 [ 26.615686][ T94] Kernel Offset: disabled [ 26.620003][ T94] Rebooting in 86400 seconds..