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 '10.128.10.26' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 48.807892] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: File exists RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 49.102982] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 49.497087] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 49.503258] 8021q: adding VLAN 0 to HW filter on device bond0 [ 49.543740] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.585938] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program [ 49.627557] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 49.633684] 8021q: adding VLAN 0 to HW filter on device team0 [ 49.672426] ================================================================== [ 49.679901] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 49.686556] Write of size 4 at addr ffff8801d7ca31a0 by task syzkaller351607/4476 [ 49.694148] [ 49.695758] CPU: 0 PID: 4476 Comm: syzkaller351607 Not tainted 4.16.0+ #19 [ 49.702745] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.712073] Call Trace: [ 49.714644] dump_stack+0x1b9/0x294 [ 49.718252] ? dump_stack_print_info.cold.2+0x52/0x52 [ 49.723425] ? printk+0x9e/0xba [ 49.726688] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 49.731429] ? kasan_check_write+0x14/0x20 [ 49.735646] print_address_description+0x6c/0x20b [ 49.740472] ? skb_release_data+0x19b/0x860 [ 49.744776] kasan_report.cold.7+0xac/0x2f5 [ 49.749078] check_memory_region+0x13e/0x1b0 [ 49.753463] kasan_check_write+0x14/0x20 [ 49.757501] skb_release_data+0x19b/0x860 [ 49.761629] ? skb_tx_error+0x2f0/0x2f0 [ 49.765578] ? kasan_check_read+0x11/0x20 [ 49.769707] ? rcu_is_watching+0x85/0x140 [ 49.773836] ? kasan_check_write+0x14/0x20 [ 49.778052] ? sock_rmem_free+0x6f/0x90 [ 49.782006] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.787523] skb_release_all+0x4a/0x60 [ 49.791388] kfree_skb+0x195/0x560 [ 49.794903] ? skb_queue_purge+0x19/0x40 [ 49.798944] ? __kfree_skb+0x20/0x20 [ 49.802637] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 49.807202] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 49.812720] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.817713] ? trace_hardirqs_on+0xd/0x10 [ 49.821840] ? skb_dequeue+0x12f/0x180 [ 49.825702] skb_queue_purge+0x19/0x40 [ 49.829568] packet_sock_destruct+0x93/0x290 [ 49.833951] ? packet_mm_close+0xc0/0xc0 [ 49.838018] ? graph_lock+0x170/0x170 [ 49.841795] ? __free_object+0x16e/0x330 [ 49.845834] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 49.851091] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 49.855650] ? packet_mm_close+0xc0/0xc0 [ 49.859691] __sk_destruct+0xff/0xa40 [ 49.863481] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 49.868394] ? graph_lock+0x170/0x170 [ 49.872177] ? lock_downgrade+0x8e0/0x8e0 [ 49.876307] ? __lock_is_held+0xb5/0x140 [ 49.880360] ? kasan_check_read+0x11/0x20 [ 49.884485] ? do_raw_spin_unlock+0x9e/0x2e0 [ 49.888886] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 49.893448] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 49.898532] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.904057] ? refcount_sub_and_test+0x212/0x330 [ 49.908807] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 49.913554] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 49.918291] ? pcpu_free_area+0xa90/0xa90 [ 49.922421] sk_destruct+0x78/0x90 [ 49.925939] __sk_free+0x22e/0x340 [ 49.929460] sk_free+0x42/0x50 [ 49.932633] packet_release+0xa18/0xd50 [ 49.936584] ? lock_downgrade+0x8e0/0x8e0 [ 49.940713] ? packet_lookup_frame+0x270/0x270 [ 49.945284] ? cpumask_weight.constprop.5+0x44/0x44 [ 49.950283] ? do_raw_spin_lock+0xc1/0x200 [ 49.954500] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.960027] ? locks_remove_file+0x3f7/0x5a0 [ 49.964416] ? fcntl_setlk+0x1020/0x1020 [ 49.968456] ? fsnotify+0x415/0x1100 [ 49.972149] ? fsnotify_first_mark+0x330/0x330 [ 49.976712] sock_release+0x96/0x1b0 [ 49.980405] ? sock_alloc_file+0x4e0/0x4e0 [ 49.984615] sock_close+0x16/0x20 [ 49.988046] __fput+0x34d/0x890 [ 49.991303] ? fput+0x1a0/0x1a0 [ 49.994562] ? check_same_owner+0x320/0x320 [ 49.998865] ____fput+0x15/0x20 [ 50.002124] task_work_run+0x1e4/0x290 [ 50.005989] ? task_work_cancel+0x240/0x240 [ 50.010290] ? switch_task_namespaces+0xbd/0xd0 [ 50.014941] do_exit+0x1aee/0x2730 [ 50.018460] ? do_raw_spin_unlock+0x31/0x2e0 [ 50.022844] ? mm_update_next_owner+0x980/0x980 [ 50.027492] ? kasan_check_write+0x14/0x20 [ 50.031702] ? do_raw_spin_lock+0xc1/0x200 [ 50.035914] ? trace_hardirqs_off+0xd/0x10 [ 50.040127] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 50.045222] ? debug_check_no_obj_freed+0x2ff/0x584 [ 50.050217] ? trace_hardirqs_off+0xd/0x10 [ 50.054436] ? quarantine_put+0xeb/0x190 [ 50.058486] ? kfree+0x111/0x260 [ 50.061833] ? ___sys_sendmsg+0x31a/0x940 [ 50.065958] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 50.070953] ? trace_hardirqs_on+0xd/0x10 [ 50.075084] ? ___sys_sendmsg+0x31f/0x940 [ 50.079213] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.084760] ? copy_msghdr_from_user+0x560/0x560 [ 50.089501] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 50.094231] ? graph_lock+0x170/0x170 [ 50.098008] ? graph_lock+0x170/0x170 [ 50.101789] ? find_held_lock+0x36/0x1c0 [ 50.105828] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.111342] ? __fget_light+0x2ef/0x430 [ 50.115296] ? fget_raw+0x20/0x20 [ 50.118727] ? find_held_lock+0x36/0x1c0 [ 50.122791] ? lock_downgrade+0x8e0/0x8e0 [ 50.126919] ? handle_mm_fault+0x8c0/0xc70 [ 50.131132] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.136656] ? sockfd_lookup_light+0xc5/0x160 [ 50.141146] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.146673] ? __sys_sendmsg+0x1aa/0x270 [ 50.150714] ? SyS_shutdown+0x30/0x30 [ 50.154499] ? __do_page_fault+0x441/0xe40 [ 50.158715] do_group_exit+0x16f/0x430 [ 50.162581] ? SyS_exit+0x30/0x30 [ 50.166013] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 50.170835] ? do_syscall_64+0xb7/0x9d0 [ 50.174790] ? do_group_exit+0x430/0x430 [ 50.178834] SyS_exit_group+0x1d/0x20 [ 50.182623] do_syscall_64+0x29e/0x9d0 [ 50.186489] ? vmalloc_sync_all+0x30/0x30 [ 50.190615] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.195349] ? syscall_return_slowpath+0x5c0/0x5c0 [ 50.200256] ? syscall_return_slowpath+0x30f/0x5c0 [ 50.205187] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 50.210531] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.215361] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 50.220543] RIP: 0033:0x441849 [ 50.223712] RSP: 002b:00007ffe90b69d38 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 50.231400] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441849 [ 50.238645] RDX: 0000000000441849 RSI: 0000000000000000 RDI: 0000000000000001 [ 50.245892] RBP: 00000000004a3458 R08: 00000000000024d0 R09: 00000000006cd018 [ 50.253156] R10: 00000000000024d0 R11: 0000000000000202 R12: 00007ffe90b69e38 [ 50.260416] R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 [ 50.267670] [ 50.269279] Allocated by task 4476: [ 50.272892] save_stack+0x43/0xd0 [ 50.276343] kasan_kmalloc+0xc4/0xe0 [ 50.280036] __kmalloc_node_track_caller+0x47/0x70 [ 50.284945] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 50.290377] __alloc_skb+0x14d/0x780 [ 50.294073] alloc_skb_with_frags+0x137/0x760 [ 50.298545] sock_alloc_send_pskb+0x87a/0xae0 [ 50.303019] packet_sendmsg+0x1bd1/0x6100 [ 50.307144] sock_sendmsg+0xd5/0x120 [ 50.310833] ___sys_sendmsg+0x805/0x940 [ 50.314783] __sys_sendmsg+0x115/0x270 [ 50.318652] SyS_sendmsg+0x29/0x30 [ 50.322183] do_syscall_64+0x29e/0x9d0 [ 50.326049] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 50.331209] [ 50.332813] Freed by task 4476: [ 50.336071] save_stack+0x43/0xd0 [ 50.339501] __kasan_slab_free+0x11a/0x170 [ 50.343713] kasan_slab_free+0xe/0x10 [ 50.347487] kfree+0xd9/0x260 [ 50.350569] skb_free_head+0x99/0xc0 [ 50.354275] skb_release_data+0x690/0x860 [ 50.358400] skb_release_all+0x4a/0x60 [ 50.362264] kfree_skb+0x195/0x560 [ 50.365785] ip6_tnl_start_xmit+0xa44/0x2290 [ 50.370170] dev_hard_start_xmit+0x264/0xc10 [ 50.374552] __dev_queue_xmit+0x2724/0x34c0 [ 50.378853] dev_queue_xmit+0x17/0x20 [ 50.382630] packet_sendmsg+0x411d/0x6100 [ 50.386758] sock_sendmsg+0xd5/0x120 [ 50.390448] ___sys_sendmsg+0x805/0x940 [ 50.394397] __sys_sendmsg+0x115/0x270 [ 50.398271] SyS_sendmsg+0x29/0x30 [ 50.401789] do_syscall_64+0x29e/0x9d0 [ 50.405655] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 50.410815] [ 50.412418] The buggy address belongs to the object at ffff8801d7ca30c0 [ 50.412418] which belongs to the cache kmalloc-512 of size 512 [ 50.425051] The buggy address is located 224 bytes inside of [ 50.425051] 512-byte region [ffff8801d7ca30c0, ffff8801d7ca32c0) [ 50.436901] The buggy address belongs to the page: [ 50.441806] page:ffffea00075f28c0 count:1 mapcount:0 mapping:ffff8801d7ca30c0 index:0x0 [ 50.449924] flags: 0x2fffc0000000100(slab) [ 50.454140] raw: 02fffc0000000100 ffff8801d7ca30c0 0000000000000000 0000000100000006 [ 50.462002] raw: ffffea00075f2260 ffffea00075f3ba0 ffff8801dac00940 0000000000000000 [ 50.469856] page dumped because: kasan: bad access detected [ 50.475538] [ 50.477137] Memory state around the buggy address: [ 50.482043] ffff8801d7ca3080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 50.489394] ffff8801d7ca3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 50.496982] >ffff8801d7ca3180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 50.504337] ^ [ 50.508755] ffff8801d7ca3200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 50.516125] ffff8801d7ca3280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 50.523485] ================================================================== [ 50.530847] Disabling lock debugging due to kernel taint [ 50.536758] Kernel panic - not syncing: panic_on_warn set ... [ 50.536758] [ 50.544141] CPU: 0 PID: 4476 Comm: syzkaller351607 Tainted: G B 4.16.0+ #19 [ 50.552454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.561810] Call Trace: [ 50.564413] dump_stack+0x1b9/0x294 [ 50.568051] ? dump_stack_print_info.cold.2+0x52/0x52 [ 50.573249] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.578010] ? skb_release_data+0xd0/0x860 [ 50.582251] panic+0x22f/0x4de [ 50.585447] ? add_taint.cold.5+0x16/0x16 [ 50.589599] ? do_raw_spin_unlock+0x9e/0x2e0 [ 50.594024] ? do_raw_spin_unlock+0x9e/0x2e0 [ 50.598437] ? skb_release_data+0x19b/0x860 [ 50.602766] kasan_end_report+0x47/0x4f [ 50.606753] kasan_report.cold.7+0xc9/0x2f5 [ 50.611081] check_memory_region+0x13e/0x1b0 [ 50.615499] kasan_check_write+0x14/0x20 [ 50.619565] skb_release_data+0x19b/0x860 [ 50.623720] ? skb_tx_error+0x2f0/0x2f0 [ 50.627705] ? kasan_check_read+0x11/0x20 [ 50.631864] ? rcu_is_watching+0x85/0x140 [ 50.636036] ? kasan_check_write+0x14/0x20 [ 50.640284] ? sock_rmem_free+0x6f/0x90 [ 50.644272] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.649842] skb_release_all+0x4a/0x60 [ 50.653743] kfree_skb+0x195/0x560 [ 50.657289] ? skb_queue_purge+0x19/0x40 [ 50.661357] ? __kfree_skb+0x20/0x20 [ 50.665077] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 50.669666] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 50.674779] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 50.679812] ? trace_hardirqs_on+0xd/0x10 [ 50.683972] ? skb_dequeue+0x12f/0x180 [ 50.687867] skb_queue_purge+0x19/0x40 [ 50.691760] packet_sock_destruct+0x93/0x290 [ 50.696176] ? packet_mm_close+0xc0/0xc0 [ 50.700235] ? graph_lock+0x170/0x170 [ 50.704036] ? __free_object+0x16e/0x330 [ 50.708092] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 50.713352] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 50.717914] ? packet_mm_close+0xc0/0xc0 [ 50.721950] __sk_destruct+0xff/0xa40 [ 50.725727] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 50.730633] ? graph_lock+0x170/0x170 [ 50.734407] ? lock_downgrade+0x8e0/0x8e0 [ 50.738530] ? __lock_is_held+0xb5/0x140 [ 50.742568] ? kasan_check_read+0x11/0x20 [ 50.746688] ? do_raw_spin_unlock+0x9e/0x2e0 [ 50.751072] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 50.755640] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 50.760738] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.766257] ? refcount_sub_and_test+0x212/0x330 [ 50.770999] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 50.775741] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 50.780476] ? pcpu_free_area+0xa90/0xa90 [ 50.784603] sk_destruct+0x78/0x90 [ 50.788132] __sk_free+0x22e/0x340 [ 50.791647] sk_free+0x42/0x50 [ 50.794818] packet_release+0xa18/0xd50 [ 50.798768] ? lock_downgrade+0x8e0/0x8e0 [ 50.802892] ? packet_lookup_frame+0x270/0x270 [ 50.807448] ? cpumask_weight.constprop.5+0x44/0x44 [ 50.812441] ? do_raw_spin_lock+0xc1/0x200 [ 50.816655] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.822166] ? locks_remove_file+0x3f7/0x5a0 [ 50.826549] ? fcntl_setlk+0x1020/0x1020 [ 50.830585] ? fsnotify+0x415/0x1100 [ 50.834275] ? fsnotify_first_mark+0x330/0x330 [ 50.838832] sock_release+0x96/0x1b0 [ 50.842521] ? sock_alloc_file+0x4e0/0x4e0 [ 50.846730] sock_close+0x16/0x20 [ 50.850169] __fput+0x34d/0x890 [ 50.853424] ? fput+0x1a0/0x1a0 [ 50.856683] ? check_same_owner+0x320/0x320 [ 50.860979] ____fput+0x15/0x20 [ 50.864235] task_work_run+0x1e4/0x290 [ 50.868101] ? task_work_cancel+0x240/0x240 [ 50.872401] ? switch_task_namespaces+0xbd/0xd0 [ 50.877050] do_exit+0x1aee/0x2730 [ 50.880574] ? do_raw_spin_unlock+0x31/0x2e0 [ 50.884957] ? mm_update_next_owner+0x980/0x980 [ 50.889604] ? kasan_check_write+0x14/0x20 [ 50.893814] ? do_raw_spin_lock+0xc1/0x200 [ 50.898030] ? trace_hardirqs_off+0xd/0x10 [ 50.902244] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 50.907323] ? debug_check_no_obj_freed+0x2ff/0x584 [ 50.912326] ? trace_hardirqs_off+0xd/0x10 [ 50.916539] ? quarantine_put+0xeb/0x190 [ 50.920573] ? kfree+0x111/0x260 [ 50.923923] ? ___sys_sendmsg+0x31a/0x940 [ 50.928045] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 50.933036] ? trace_hardirqs_on+0xd/0x10 [ 50.937163] ? ___sys_sendmsg+0x31f/0x940 [ 50.941286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.946800] ? copy_msghdr_from_user+0x560/0x560 [ 50.951530] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 50.956258] ? graph_lock+0x170/0x170 [ 50.960036] ? graph_lock+0x170/0x170 [ 50.963811] ? find_held_lock+0x36/0x1c0 [ 50.967852] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.973363] ? __fget_light+0x2ef/0x430 [ 50.977311] ? fget_raw+0x20/0x20 [ 50.980739] ? find_held_lock+0x36/0x1c0 [ 50.984776] ? lock_downgrade+0x8e0/0x8e0 [ 50.988896] ? handle_mm_fault+0x8c0/0xc70 [ 50.993109] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.998622] ? sockfd_lookup_light+0xc5/0x160 [ 51.003097] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.008609] ? __sys_sendmsg+0x1aa/0x270 [ 51.012644] ? SyS_shutdown+0x30/0x30 [ 51.016424] ? __do_page_fault+0x441/0xe40 [ 51.020636] do_group_exit+0x16f/0x430 [ 51.024498] ? SyS_exit+0x30/0x30 [ 51.027928] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 51.032745] ? do_syscall_64+0xb7/0x9d0 [ 51.036693] ? do_group_exit+0x430/0x430 [ 51.040729] SyS_exit_group+0x1d/0x20 [ 51.044506] do_syscall_64+0x29e/0x9d0 [ 51.048369] ? vmalloc_sync_all+0x30/0x30 [ 51.052494] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 51.057227] ? syscall_return_slowpath+0x5c0/0x5c0 [ 51.062133] ? syscall_return_slowpath+0x30f/0x5c0 [ 51.067045] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 51.072395] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.077213] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 51.082379] RIP: 0033:0x441849 [ 51.085545] RSP: 002b:00007ffe90b69d38 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 51.093229] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441849 [ 51.100472] RDX: 0000000000441849 RSI: 0000000000000000 RDI: 0000000000000001 [ 51.107716] RBP: 00000000004a3458 R08: 00000000000024d0 R09: 00000000006cd018 [ 51.114963] R10: 00000000000024d0 R11: 0000000000000202 R12: 00007ffe90b69e38 [ 51.122208] R13: 00000000004025d0 R14: 0000000000000000 R15: 0000000000000000 [ 51.129920] Dumping ftrace buffer: [ 51.133449] (ftrace buffer empty) [ 51.137142] Kernel Offset: disabled [ 51.140743] Rebooting in 86400 seconds..