[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.253' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 87.272608][ T6829] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.299243][ T6836] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.326028][ T6838] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.355256][ T6839] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.384851][ T6837] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.403555][ T6840] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.538757][ T6870] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.602266][ T6838] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.656259][ T6853] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. [ 87.712399][ T6879] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. executing program executing program executing program executing program executing program executing program [ 88.162854][ T7033] ================================================================== [ 88.171098][ T7033] BUG: KASAN: use-after-free in macvlan_dev_get_iflink+0x6a/0x70 [ 88.178818][ T7033] Read of size 4 at addr ffff88808b62a100 by task syz-executor984/7033 [ 88.187051][ T7033] [ 88.189390][ T7033] CPU: 0 PID: 7033 Comm: syz-executor984 Not tainted 5.8.0-rc2-syzkaller #0 [ 88.198059][ T7033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.208117][ T7033] Call Trace: [ 88.211416][ T7033] dump_stack+0x1f0/0x31e [ 88.215768][ T7033] print_address_description+0x66/0x5a0 [ 88.221415][ T7033] ? vprintk_emit+0x342/0x3c0 [ 88.226110][ T7033] ? printk+0x62/0x83 [ 88.230116][ T7033] ? vprintk_emit+0x339/0x3c0 [ 88.234807][ T7033] kasan_report+0x132/0x1d0 [ 88.239527][ T7033] ? macvlan_dev_get_iflink+0x6a/0x70 [ 88.244923][ T7033] macvlan_dev_get_iflink+0x6a/0x70 [ 88.250134][ T7033] rfc2863_policy+0x11f/0x2a0 [ 88.254846][ T7033] linkwatch_do_dev+0x3a/0x160 [ 88.259661][ T7033] netdev_run_todo+0x2c8/0xc90 [ 88.264624][ T7033] rtnetlink_rcv_msg+0x890/0xd40 [ 88.269597][ T7033] ? lock_acquire+0x160/0x720 [ 88.274289][ T7033] ? rcu_lock_acquire+0x5/0x30 [ 88.279080][ T7033] ? check_preemption_disabled+0x40/0x240 [ 88.284809][ T7033] ? debug_smp_processor_id+0x5/0x20 [ 88.290120][ T7033] netlink_rcv_skb+0x190/0x3a0 [ 88.294903][ T7033] ? rtnetlink_bind+0x80/0x80 [ 88.299607][ T7033] netlink_unicast+0x786/0x940 [ 88.304485][ T7033] netlink_sendmsg+0xa57/0xd70 [ 88.310483][ T7033] ? netlink_getsockopt+0x9e0/0x9e0 [ 88.315698][ T7033] ____sys_sendmsg+0x519/0x800 [ 88.320474][ T7033] ? import_iovec+0x12a/0x2c0 [ 88.325169][ T7033] __sys_sendmsg+0x2b1/0x360 [ 88.329779][ T7033] ? _copy_to_user+0x100/0x140 [ 88.334548][ T7033] ? fput_many+0x42/0x1a0 [ 88.338886][ T7033] ? check_preemption_disabled+0x40/0x240 [ 88.344617][ T7033] ? check_preemption_disabled+0x40/0x240 [ 88.350355][ T7033] ? check_preemption_disabled+0x40/0x240 [ 88.356112][ T7033] ? do_syscall_64+0x1d/0xe0 [ 88.360745][ T7033] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.366817][ T7033] do_syscall_64+0x73/0xe0 [ 88.371247][ T7033] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.377145][ T7033] RIP: 0033:0x446e69 [ 88.381121][ T7033] Code: Bad RIP value. [ 88.385213][ T7033] RSP: 002b:00007f7fa3a46d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 88.393627][ T7033] RAX: ffffffffffffffda RBX: 00000000006dbc98 RCX: 0000000000446e69 [ 88.402475][ T7033] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 [ 88.410452][ T7033] RBP: 00000000006dbc90 R08: 0000000000000000 R09: 0000000000000000 [ 88.418428][ T7033] R10: 000000000000000a R11: 0000000000000246 R12: 00000000006dbc9c [ 88.426411][ T7033] R13: 0000000000000000 R14: 0000000000000000 R15: 0705001000000048 [ 88.434402][ T7033] [ 88.436740][ T7033] Allocated by task 7001: [ 88.441079][ T7033] __kasan_kmalloc+0x103/0x140 [ 88.445878][ T7033] kvmalloc_node+0x81/0x110 [ 88.450384][ T7033] alloc_netdev_mqs+0x86/0xf90 [ 88.455160][ T7033] rtnl_create_link+0x242/0x9c0 [ 88.460288][ T7033] rtnl_newlink+0x12a2/0x1bf0 [ 88.464974][ T7033] rtnetlink_rcv_msg+0x889/0xd40 [ 88.469920][ T7033] netlink_rcv_skb+0x190/0x3a0 [ 88.474707][ T7033] netlink_unicast+0x786/0x940 [ 88.479483][ T7033] netlink_sendmsg+0xa57/0xd70 [ 88.484343][ T7033] ____sys_sendmsg+0x519/0x800 [ 88.489203][ T7033] __sys_sendmsg+0x2b1/0x360 [ 88.494002][ T7033] do_syscall_64+0x73/0xe0 [ 88.498458][ T7033] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.504352][ T7033] [ 88.507991][ T7033] Freed by task 7001: [ 88.512156][ T7033] __kasan_slab_free+0x114/0x170 [ 88.517098][ T7033] kfree+0x10a/0x220 [ 88.521111][ T7033] device_release+0x70/0x1a0 [ 88.525706][ T7033] kobject_put+0x15b/0x220 [ 88.530128][ T7033] netdev_run_todo+0xb17/0xc90 [ 88.534906][ T7033] rtnetlink_rcv_msg+0x890/0xd40 [ 88.539952][ T7033] netlink_rcv_skb+0x190/0x3a0 [ 88.544728][ T7033] netlink_unicast+0x786/0x940 [ 88.549508][ T7033] netlink_sendmsg+0xa57/0xd70 [ 88.554284][ T7033] ____sys_sendmsg+0x519/0x800 [ 88.559058][ T7033] __sys_sendmsg+0x2b1/0x360 [ 88.563654][ T7033] do_syscall_64+0x73/0xe0 [ 88.568078][ T7033] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.573988][ T7033] [ 88.576329][ T7033] The buggy address belongs to the object at ffff88808b62a000 [ 88.576329][ T7033] which belongs to the cache kmalloc-4k of size 4096 [ 88.590486][ T7033] The buggy address is located 256 bytes inside of [ 88.590486][ T7033] 4096-byte region [ffff88808b62a000, ffff88808b62b000) [ 88.603860][ T7033] The buggy address belongs to the page: [ 88.609509][ T7033] page:ffffea00022d8a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00022d8a80 order:1 compound_mapcount:0 [ 88.623043][ T7033] flags: 0xfffe0000010200(slab|head) [ 88.628334][ T7033] raw: 00fffe0000010200 ffffea0002a12288 ffffea0002462c08 ffff8880aa402000 [ 88.636926][ T7033] raw: 0000000000000000 ffff88808b62a000 0000000100000001 0000000000000000 [ 88.645508][ T7033] page dumped because: kasan: bad access detected [ 88.652031][ T7033] [ 88.654389][ T7033] Memory state around the buggy address: [ 88.660025][ T7033] ffff88808b62a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.668094][ T7033] ffff88808b62a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.676164][ T7033] >ffff88808b62a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.684235][ T7033] ^ [ 88.688303][ T7033] ffff88808b62a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.696368][ T7033] ffff88808b62a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 88.704437][ T7033] ================================================================== [ 88.712500][ T7033] Disabling lock debugging due to kernel taint 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 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 [ 92.328871][ T8641] __nla_validate_parse: 125 callbacks suppressed [ 92.328876][ T8641] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. executing program [ 92.436418][ T8678] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 92.526811][ T8679] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. executing program executing program [ 92.598231][ T8699] netlink: 24 bytes leftover after parsing attributes in process `syz-executor984'. [ 92.669330][ T8706] netlink: 4 bytes leftover after parsing attributes in process `syz-executor984'. [ 92.698452][ T7033] Kernel panic - not syncing: panic_on_warn set ... [ 92.705081][ T7033] CPU: 1 PID: 7033 Comm: syz-executor984 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 92.715137][ T7033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.725189][ T7033] Call Trace: [ 92.728573][ T7033] dump_stack+0x1f0/0x31e [ 92.732921][ T7033] panic+0x264/0x7a0 [ 92.736823][ T7033] ? trace_hardirqs_on+0x30/0x80 [ 92.741845][ T7033] kasan_report+0x1c9/0x1d0 [ 92.746350][ T7033] ? macvlan_dev_get_iflink+0x6a/0x70 [ 92.751717][ T7033] macvlan_dev_get_iflink+0x6a/0x70 [ 92.756913][ T7033] rfc2863_policy+0x11f/0x2a0 [ 92.761591][ T7033] linkwatch_do_dev+0x3a/0x160 [ 92.766445][ T7033] netdev_run_todo+0x2c8/0xc90 [ 92.771216][ T7033] rtnetlink_rcv_msg+0x890/0xd40 [ 92.776170][ T7033] ? lock_acquire+0x160/0x720 [ 92.780848][ T7033] ? rcu_lock_acquire+0x5/0x30 [ 92.785608][ T7033] ? check_preemption_disabled+0x40/0x240 [ 92.791322][ T7033] ? debug_smp_processor_id+0x5/0x20 [ 92.796609][ T7033] netlink_rcv_skb+0x190/0x3a0 [ 92.801376][ T7033] ? rtnetlink_bind+0x80/0x80 [ 92.806053][ T7033] netlink_unicast+0x786/0x940 [ 92.810898][ T7033] netlink_sendmsg+0xa57/0xd70 [ 92.815664][ T7033] ? netlink_getsockopt+0x9e0/0x9e0 [ 92.820859][ T7033] ____sys_sendmsg+0x519/0x800 [ 92.825627][ T7033] ? import_iovec+0x12a/0x2c0 [ 92.830311][ T7033] __sys_sendmsg+0x2b1/0x360 [ 92.834925][ T7033] ? _copy_to_user+0x100/0x140 [ 92.839717][ T7033] ? fput_many+0x42/0x1a0 [ 92.844046][ T7033] ? check_preemption_disabled+0x40/0x240 [ 92.849768][ T7033] ? check_preemption_disabled+0x40/0x240 [ 92.855503][ T7033] ? check_preemption_disabled+0x40/0x240 [ 92.861379][ T7033] ? do_syscall_64+0x1d/0xe0 [ 92.865975][ T7033] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 92.872037][ T7033] do_syscall_64+0x73/0xe0 [ 92.876450][ T7033] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 92.882941][ T7033] RIP: 0033:0x446e69 [ 92.886834][ T7033] Code: Bad RIP value. [ 92.890896][ T7033] RSP: 002b:00007f7fa3a46d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 92.899309][ T7033] RAX: ffffffffffffffda RBX: 00000000006dbc98 RCX: 0000000000446e69 [ 92.907394][ T7033] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 [ 92.915519][ T7033] RBP: 00000000006dbc90 R08: 0000000000000000 R09: 0000000000000000 [ 92.923577][ T7033] R10: 000000000000000a R11: 0000000000000246 R12: 00000000006dbc9c [ 92.931520][ T7033] R13: 0000000000000000 R14: 0000000000000000 R15: 0705001000000048 [ 92.941197][ T7033] Kernel Offset: disabled [ 92.945519][ T7033] Rebooting in 86400 seconds..