[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 527.347131][ T6859] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.384044][ T6866] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.412704][ T6868] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.449652][ T6867] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.478150][ T6870] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.523387][ T6869] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program executing program executing program executing program [ 527.783026][ T7015] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 527.932296][ T7025] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program [ 528.026808][ T7023] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program [ 528.091116][ T7024] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 531.813393][ T8052] ================================================================== [ 531.821753][ T8052] BUG: KASAN: use-after-free in vlan_dev_get_iflink+0x5f/0x70 [ 531.829227][ T8052] Read of size 4 at addr ffff88809501a100 by task syz-executor436/8052 [ 531.837462][ T8052] [ 531.839806][ T8052] CPU: 1 PID: 8052 Comm: syz-executor436 Not tainted 5.8.0-syzkaller #0 [ 531.848131][ T8052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 531.858195][ T8052] Call Trace: [ 531.861497][ T8052] dump_stack+0x18f/0x20d [ 531.865852][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 531.870982][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 531.876112][ T8052] print_address_description.constprop.0.cold+0xae/0x497 [ 531.883155][ T8052] ? vprintk_func+0x97/0x1a6 [ 531.887776][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 531.892904][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 531.898031][ T8052] kasan_report.cold+0x1f/0x37 [ 531.902816][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 531.907961][ T8052] vlan_dev_get_iflink+0x5f/0x70 [ 531.912916][ T8052] ? vlan_dev_poll_controller+0x10/0x10 [ 531.918515][ T8052] dev_get_iflink+0x73/0xe0 [ 531.923125][ T8052] rfc2863_policy+0x243/0x2e0 [ 531.927818][ T8052] linkwatch_do_dev+0x2a/0x180 [ 531.932599][ T8052] linkwatch_forget_dev+0x16a/0x200 [ 531.937816][ T8052] netdev_run_todo+0x258/0xac0 [ 531.942597][ T8052] ? generic_xdp_install+0x700/0x700 [ 531.947918][ T8052] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 531.954086][ T8052] ? trace_hardirqs_on+0x5f/0x220 [ 531.959172][ T8052] ? lockdep_hardirqs_on+0x76/0xf0 [ 531.964303][ T8052] ? __rtnl_newlink+0x1740/0x1740 [ 531.969338][ T8052] rtnetlink_rcv_msg+0x45b/0xad0 [ 531.974294][ T8052] ? rtnetlink_put_metrics+0x510/0x510 [ 531.979780][ T8052] ? lock_acquire+0x1f1/0xad0 [ 531.984564][ T8052] ? netlink_deliver_tap+0x146/0xb70 [ 531.989886][ T8052] netlink_rcv_skb+0x15a/0x430 [ 531.994761][ T8052] ? rtnetlink_put_metrics+0x510/0x510 [ 532.000324][ T8052] ? netlink_ack+0xa10/0xa10 [ 532.004933][ T8052] ? lock_is_held_type+0xbb/0xf0 [ 532.009885][ T8052] netlink_unicast+0x533/0x7d0 [ 532.014674][ T8052] ? netlink_attachskb+0x810/0x810 [ 532.019799][ T8052] ? _copy_from_iter_full+0x247/0x890 [ 532.025191][ T8052] ? __phys_addr+0x9a/0x110 [ 532.029710][ T8052] ? __phys_addr_symbol+0x2c/0x70 [ 532.034751][ T8052] ? __check_object_size+0x171/0x3e4 [ 532.040059][ T8052] netlink_sendmsg+0x856/0xd90 [ 532.044843][ T8052] ? netlink_unicast+0x7d0/0x7d0 [ 532.049807][ T8052] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 532.055108][ T8052] ? netlink_unicast+0x7d0/0x7d0 [ 532.060176][ T8052] sock_sendmsg+0xcf/0x120 [ 532.064615][ T8052] ____sys_sendmsg+0x6e8/0x810 [ 532.069399][ T8052] ? kernel_sendmsg+0x50/0x50 [ 532.074088][ T8052] ? do_recvmmsg+0x6d0/0x6d0 [ 532.078698][ T8052] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 532.084702][ T8052] ___sys_sendmsg+0xf3/0x170 [ 532.089314][ T8052] ? sendmsg_copy_msghdr+0x160/0x160 [ 532.094616][ T8052] ? __fget_files+0x272/0x400 [ 532.099313][ T8052] ? lock_downgrade+0x830/0x830 [ 532.104197][ T8052] ? __fget_files+0x294/0x400 [ 532.108889][ T8052] ? __fget_light+0xea/0x280 [ 532.113503][ T8052] __sys_sendmsg+0xe5/0x1b0 [ 532.118031][ T8052] ? __sys_sendmsg_sock+0xb0/0xb0 [ 532.123078][ T8052] ? trace_hardirqs_on+0x5f/0x220 [ 532.128115][ T8052] ? lockdep_hardirqs_on+0x76/0xf0 [ 532.133577][ T8052] do_syscall_64+0x2d/0x70 [ 532.138076][ T8052] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 532.143984][ T8052] RIP: 0033:0x446d79 [ 532.147914][ T8052] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 532.167522][ T8052] RSP: 002b:00007f6df83a6d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 532.175922][ T8052] RAX: ffffffffffffffda RBX: 00000000006dbc78 RCX: 0000000000446d79 [ 532.183885][ T8052] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 532.191841][ T8052] RBP: 00000000006dbc70 R08: 0000000000000018 R09: 0000000000000000 [ 532.199798][ T8052] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000006dbc7c [ 532.207753][ T8052] R13: 0000000000040000 R14: 0000000000000000 R15: 0705001000000048 [ 532.215719][ T8052] [ 532.218033][ T8052] Allocated by task 8039: [ 532.222357][ T8052] kasan_save_stack+0x1b/0x40 [ 532.227017][ T8052] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 532.232631][ T8052] kvmalloc_node+0x61/0xf0 [ 532.237033][ T8052] alloc_netdev_mqs+0x97/0xdc0 [ 532.241778][ T8052] rtnl_create_link+0x219/0xad0 [ 532.246700][ T8052] __rtnl_newlink+0xf9b/0x1740 [ 532.251708][ T8052] rtnl_newlink+0x64/0xa0 [ 532.256027][ T8052] rtnetlink_rcv_msg+0x44e/0xad0 [ 532.260947][ T8052] netlink_rcv_skb+0x15a/0x430 [ 532.265692][ T8052] netlink_unicast+0x533/0x7d0 [ 532.270437][ T8052] netlink_sendmsg+0x856/0xd90 [ 532.275210][ T8052] sock_sendmsg+0xcf/0x120 [ 532.279608][ T8052] ____sys_sendmsg+0x6e8/0x810 [ 532.284354][ T8052] ___sys_sendmsg+0xf3/0x170 [ 532.288943][ T8052] __sys_sendmsg+0xe5/0x1b0 [ 532.293431][ T8052] do_syscall_64+0x2d/0x70 [ 532.297828][ T8052] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 532.303692][ T8052] [ 532.306003][ T8052] Freed by task 8039: [ 532.309967][ T8052] kasan_save_stack+0x1b/0x40 [ 532.314626][ T8052] kasan_set_track+0x1c/0x30 [ 532.319198][ T8052] kasan_set_free_info+0x1b/0x30 [ 532.324118][ T8052] __kasan_slab_free+0xd8/0x120 [ 532.328952][ T8052] kfree+0x103/0x2c0 [ 532.332829][ T8052] kvfree+0x42/0x50 [ 532.336620][ T8052] device_release+0x71/0x200 [ 532.341282][ T8052] kobject_put+0x171/0x270 [ 532.345682][ T8052] netdev_run_todo+0x765/0xac0 [ 532.350429][ T8052] rtnetlink_rcv_msg+0x45b/0xad0 [ 532.355351][ T8052] netlink_rcv_skb+0x15a/0x430 [ 532.360098][ T8052] netlink_unicast+0x533/0x7d0 [ 532.364844][ T8052] netlink_sendmsg+0x856/0xd90 [ 532.369619][ T8052] sock_sendmsg+0xcf/0x120 [ 532.374019][ T8052] ____sys_sendmsg+0x6e8/0x810 [ 532.378765][ T8052] ___sys_sendmsg+0xf3/0x170 [ 532.383337][ T8052] __sys_sendmsg+0xe5/0x1b0 [ 532.387824][ T8052] do_syscall_64+0x2d/0x70 [ 532.392224][ T8052] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 532.398087][ T8052] [ 532.400399][ T8052] The buggy address belongs to the object at ffff88809501a000 [ 532.400399][ T8052] which belongs to the cache kmalloc-4k of size 4096 [ 532.414437][ T8052] The buggy address is located 256 bytes inside of [ 532.414437][ T8052] 4096-byte region [ffff88809501a000, ffff88809501b000) [ 532.427772][ T8052] The buggy address belongs to the page: [ 532.433481][ T8052] page:00000000483e6e3a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9501a [ 532.443608][ T8052] head:00000000483e6e3a order:1 compound_mapcount:0 [ 532.450178][ T8052] flags: 0xfffe0000010200(slab|head) [ 532.455447][ T8052] raw: 00fffe0000010200 ffffea0002553088 ffffea0002555188 ffff8880aa040900 [ 532.464015][ T8052] raw: 0000000000000000 ffff88809501a000 0000000100000001 0000000000000000 [ 532.472576][ T8052] page dumped because: kasan: bad access detected [ 532.478982][ T8052] [ 532.481289][ T8052] Memory state around the buggy address: [ 532.486922][ T8052] ffff88809501a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 532.494978][ T8052] ffff88809501a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 532.504757][ T8052] >ffff88809501a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 532.512801][ T8052] ^ executing program executing program executing program [ 532.516852][ T8052] ffff88809501a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 532.524896][ T8052] ffff88809501a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 532.532934][ T8052] ================================================================== [ 532.540972][ T8052] Disabling lock debugging due to kernel taint [ 532.617215][ T8214] __nla_validate_parse: 43 callbacks suppressed [ 532.617224][ T8214] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 532.736607][ T8215] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 532.798904][ T8216] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program executing program executing program executing program executing program [ 533.872836][ T8396] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.017009][ T8395] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.071872][ T8399] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.132170][ T8397] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.199951][ T8398] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. executing program executing program executing program executing program executing program [ 534.416550][ T8535] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.549572][ T8531] netlink: 24 bytes leftover after parsing attributes in process `syz-executor436'. [ 534.607895][ T8052] Kernel panic - not syncing: panic_on_warn set ... [ 534.614540][ T8052] CPU: 0 PID: 8052 Comm: syz-executor436 Tainted: G B 5.8.0-syzkaller #0 [ 534.624259][ T8052] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 534.634311][ T8052] Call Trace: [ 534.637605][ T8052] dump_stack+0x18f/0x20d [ 534.641950][ T8052] ? vlan_dev_get_iflink+0x50/0x70 [ 534.647069][ T8052] panic+0x2e3/0x75c [ 534.650992][ T8052] ? __warn_printk+0xf3/0xf3 [ 534.655596][ T8052] ? preempt_schedule_common+0x59/0xc0 [ 534.661066][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 534.666189][ T8052] ? preempt_schedule_thunk+0x16/0x18 [ 534.671574][ T8052] ? trace_hardirqs_on+0x55/0x220 [ 534.676606][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 534.681729][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 534.686846][ T8052] end_report+0x4d/0x53 [ 534.691012][ T8052] kasan_report.cold+0xd/0x37 [ 534.695703][ T8052] ? vlan_dev_get_iflink+0x5f/0x70 [ 534.700827][ T8052] vlan_dev_get_iflink+0x5f/0x70 [ 534.705778][ T8052] ? vlan_dev_poll_controller+0x10/0x10 [ 534.711328][ T8052] dev_get_iflink+0x73/0xe0 [ 534.715847][ T8052] rfc2863_policy+0x243/0x2e0 [ 534.720540][ T8052] linkwatch_do_dev+0x2a/0x180 [ 534.725311][ T8052] linkwatch_forget_dev+0x16a/0x200 [ 534.730524][ T8052] netdev_run_todo+0x258/0xac0 [ 534.735306][ T8052] ? generic_xdp_install+0x700/0x700 [ 534.740601][ T8052] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 534.746586][ T8052] ? trace_hardirqs_on+0x5f/0x220 [ 534.751620][ T8052] ? lockdep_hardirqs_on+0x76/0xf0 [ 534.756741][ T8052] ? __rtnl_newlink+0x1740/0x1740 [ 534.761777][ T8052] rtnetlink_rcv_msg+0x45b/0xad0 [ 534.766724][ T8052] ? rtnetlink_put_metrics+0x510/0x510 [ 534.772196][ T8052] ? lock_acquire+0x1f1/0xad0 [ 534.776880][ T8052] ? netlink_deliver_tap+0x146/0xb70 [ 534.782183][ T8052] netlink_rcv_skb+0x15a/0x430 [ 534.786965][ T8052] ? rtnetlink_put_metrics+0x510/0x510 [ 534.792429][ T8052] ? netlink_ack+0xa10/0xa10 [ 534.797026][ T8052] ? lock_is_held_type+0xbb/0xf0 [ 534.801974][ T8052] netlink_unicast+0x533/0x7d0 [ 534.807713][ T8052] ? netlink_attachskb+0x810/0x810 [ 534.812846][ T8052] ? _copy_from_iter_full+0x247/0x890 [ 534.818226][ T8052] ? __phys_addr+0x9a/0x110 [ 534.822739][ T8052] ? __phys_addr_symbol+0x2c/0x70 [ 534.827775][ T8052] ? __check_object_size+0x171/0x3e4 [ 534.833073][ T8052] netlink_sendmsg+0x856/0xd90 [ 534.837848][ T8052] ? netlink_unicast+0x7d0/0x7d0 [ 534.842800][ T8052] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 534.848094][ T8052] ? netlink_unicast+0x7d0/0x7d0 [ 534.853034][ T8052] sock_sendmsg+0xcf/0x120 [ 534.857461][ T8052] ____sys_sendmsg+0x6e8/0x810 [ 534.862230][ T8052] ? kernel_sendmsg+0x50/0x50 [ 534.866921][ T8052] ? do_recvmmsg+0x6d0/0x6d0 [ 534.871525][ T8052] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 534.877527][ T8052] ___sys_sendmsg+0xf3/0x170 [ 534.882129][ T8052] ? sendmsg_copy_msghdr+0x160/0x160 [ 534.887421][ T8052] ? __fget_files+0x272/0x400 [ 534.892110][ T8052] ? lock_downgrade+0x830/0x830 [ 534.896976][ T8052] ? __fget_files+0x294/0x400 [ 534.901662][ T8052] ? __fget_light+0xea/0x280 [ 534.906262][ T8052] __sys_sendmsg+0xe5/0x1b0 [ 534.910770][ T8052] ? __sys_sendmsg_sock+0xb0/0xb0 [ 534.915807][ T8052] ? trace_hardirqs_on+0x5f/0x220 [ 534.920839][ T8052] ? lockdep_hardirqs_on+0x76/0xf0 [ 534.925965][ T8052] do_syscall_64+0x2d/0x70 [ 534.930392][ T8052] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 534.936287][ T8052] RIP: 0033:0x446d79 [ 534.940185][ T8052] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 534.959789][ T8052] RSP: 002b:00007f6df83a6d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 534.968206][ T8052] RAX: ffffffffffffffda RBX: 00000000006dbc78 RCX: 0000000000446d79 [ 534.976181][ T8052] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 534.984157][ T8052] RBP: 00000000006dbc70 R08: 0000000000000018 R09: 0000000000000000 [ 534.992130][ T8052] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000006dbc7c [ 535.000106][ T8052] R13: 0000000000040000 R14: 0000000000000000 R15: 0705001000000048 [ 535.009584][ T8052] Kernel Offset: disabled [ 535.013908][ T8052] Rebooting in 86400 seconds..