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 '10.128.10.9' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 35.899421] 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 [ 36.196557] 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 [ 36.587713] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 36.593834] 8021q: adding VLAN 0 to HW filter on device bond0 [ 36.637140] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.678984] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program [ 36.721653] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 36.727783] 8021q: adding VLAN 0 to HW filter on device team0 [ 36.766170] ================================================================== [ 36.773650] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 36.780297] Write of size 4 at addr ffff8801b5269ba0 by task syzkaller596824/4462 [ 36.787890] [ 36.789502] CPU: 0 PID: 4462 Comm: syzkaller596824 Not tainted 4.16.0+ #19 [ 36.796488] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.805819] Call Trace: [ 36.808391] dump_stack+0x1b9/0x294 [ 36.812002] ? dump_stack_print_info.cold.2+0x52/0x52 [ 36.817173] ? printk+0x9e/0xba [ 36.820432] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 36.825171] ? kasan_check_write+0x14/0x20 [ 36.829386] print_address_description+0x6c/0x20b [ 36.834210] ? skb_release_data+0x19b/0x860 [ 36.838511] kasan_report.cold.7+0xac/0x2f5 [ 36.842812] check_memory_region+0x13e/0x1b0 [ 36.847200] kasan_check_write+0x14/0x20 [ 36.851243] skb_release_data+0x19b/0x860 [ 36.855374] ? skb_tx_error+0x2f0/0x2f0 [ 36.859325] ? kasan_check_read+0x11/0x20 [ 36.863462] ? rcu_is_watching+0x85/0x140 [ 36.867590] ? kasan_check_write+0x14/0x20 [ 36.871807] ? sock_rmem_free+0x6f/0x90 [ 36.875764] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.881282] skb_release_all+0x4a/0x60 [ 36.885147] kfree_skb+0x195/0x560 [ 36.888666] ? skb_queue_purge+0x19/0x40 [ 36.892724] ? __kfree_skb+0x20/0x20 [ 36.896421] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.900985] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 36.906082] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.911079] ? trace_hardirqs_on+0xd/0x10 [ 36.915210] ? skb_dequeue+0x12f/0x180 [ 36.919080] skb_queue_purge+0x19/0x40 [ 36.922947] packet_sock_destruct+0x93/0x290 [ 36.927333] ? packet_mm_close+0xc0/0xc0 [ 36.931371] ? graph_lock+0x170/0x170 [ 36.935149] ? __free_object+0x16e/0x330 [ 36.939189] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 36.944618] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.949181] ? packet_mm_close+0xc0/0xc0 [ 36.953226] __sk_destruct+0xff/0xa40 [ 36.957015] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 36.961923] ? graph_lock+0x170/0x170 [ 36.965701] ? lock_downgrade+0x8e0/0x8e0 [ 36.969835] ? __lock_is_held+0xb5/0x140 [ 36.973877] ? kasan_check_read+0x11/0x20 [ 36.978012] ? do_raw_spin_unlock+0x9e/0x2e0 [ 36.982399] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.986960] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 36.992044] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.997568] ? refcount_sub_and_test+0x212/0x330 [ 37.002311] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 37.007047] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 37.011781] ? pcpu_free_area+0xa90/0xa90 [ 37.015910] sk_destruct+0x78/0x90 [ 37.019431] __sk_free+0x22e/0x340 [ 37.022951] sk_free+0x42/0x50 [ 37.026125] packet_release+0xa18/0xd50 [ 37.030079] ? lock_downgrade+0x8e0/0x8e0 [ 37.034208] ? packet_lookup_frame+0x270/0x270 [ 37.038783] ? cpumask_weight.constprop.5+0x44/0x44 [ 37.043780] ? do_raw_spin_lock+0xc1/0x200 [ 37.047995] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.053519] ? locks_remove_file+0x3f7/0x5a0 [ 37.057909] ? fcntl_setlk+0x1020/0x1020 [ 37.061949] ? fsnotify+0x415/0x1100 [ 37.065646] ? fsnotify_first_mark+0x330/0x330 [ 37.070212] sock_release+0x96/0x1b0 [ 37.073909] ? sock_alloc_file+0x4e0/0x4e0 [ 37.078124] sock_close+0x16/0x20 [ 37.081556] __fput+0x34d/0x890 [ 37.084817] ? fput+0x1a0/0x1a0 [ 37.088093] ? check_same_owner+0x320/0x320 [ 37.092398] ____fput+0x15/0x20 [ 37.095660] task_work_run+0x1e4/0x290 [ 37.099530] ? task_work_cancel+0x240/0x240 [ 37.103848] ? switch_task_namespaces+0xbd/0xd0 [ 37.108497] do_exit+0x1aee/0x2730 [ 37.112020] ? do_raw_spin_unlock+0x31/0x2e0 [ 37.116408] ? mm_update_next_owner+0x980/0x980 [ 37.121061] ? kasan_check_write+0x14/0x20 [ 37.125274] ? do_raw_spin_lock+0xc1/0x200 [ 37.129500] ? trace_hardirqs_off+0xd/0x10 [ 37.133716] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 37.138801] ? debug_check_no_obj_freed+0x2ff/0x584 [ 37.143800] ? trace_hardirqs_off+0xd/0x10 [ 37.148015] ? quarantine_put+0xeb/0x190 [ 37.152057] ? kfree+0x111/0x260 [ 37.155407] ? ___sys_sendmsg+0x31a/0x940 [ 37.159539] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.164545] ? trace_hardirqs_on+0xd/0x10 [ 37.168674] ? ___sys_sendmsg+0x31f/0x940 [ 37.172802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.178330] ? copy_msghdr_from_user+0x560/0x560 [ 37.183066] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 37.187798] ? graph_lock+0x170/0x170 [ 37.191586] ? graph_lock+0x170/0x170 [ 37.195451] ? find_held_lock+0x36/0x1c0 [ 37.199492] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.205009] ? __fget_light+0x2ef/0x430 [ 37.208967] ? fget_raw+0x20/0x20 [ 37.212405] ? find_held_lock+0x36/0x1c0 [ 37.216447] ? lock_downgrade+0x8e0/0x8e0 [ 37.220573] ? handle_mm_fault+0x8c0/0xc70 [ 37.224791] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.230311] ? sockfd_lookup_light+0xc5/0x160 [ 37.234785] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.240300] ? __sys_sendmsg+0x1aa/0x270 [ 37.244340] ? SyS_shutdown+0x30/0x30 [ 37.248122] ? __do_page_fault+0x441/0xe40 [ 37.252343] do_group_exit+0x16f/0x430 [ 37.256217] ? SyS_exit+0x30/0x30 [ 37.259651] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 37.264480] ? do_syscall_64+0xb7/0x9d0 [ 37.268433] ? do_group_exit+0x430/0x430 [ 37.272475] SyS_exit_group+0x1d/0x20 [ 37.276266] do_syscall_64+0x29e/0x9d0 [ 37.280133] ? vmalloc_sync_all+0x30/0x30 [ 37.284276] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.289011] ? syscall_return_slowpath+0x5c0/0x5c0 [ 37.293921] ? syscall_return_slowpath+0x30f/0x5c0 [ 37.298834] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 37.304189] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.309026] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 37.314194] RIP: 0033:0x4418d9 [ 37.317364] RSP: 002b:00007ffda4e03b88 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 37.325064] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004418d9 [ 37.332496] RDX: 00000000004418d9 RSI: 0000000000000000 RDI: 0000000000000001 [ 37.339744] RBP: 00000000004a34d8 R08: 000000000078e6b0 R09: 00000000006cd018 [ 37.346990] R10: 000000000078e6b0 R11: 0000000000000206 R12: 00007ffda4e03c98 [ 37.354239] R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 [ 37.361493] [ 37.363113] Allocated by task 4462: [ 37.366723] save_stack+0x43/0xd0 [ 37.370151] kasan_kmalloc+0xc4/0xe0 [ 37.373863] __kmalloc_node_track_caller+0x47/0x70 [ 37.378776] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 37.383508] __alloc_skb+0x14d/0x780 [ 37.387202] alloc_skb_with_frags+0x137/0x760 [ 37.391693] sock_alloc_send_pskb+0x87a/0xae0 [ 37.396179] packet_sendmsg+0x1bd1/0x6100 [ 37.400327] sock_sendmsg+0xd5/0x120 [ 37.404018] ___sys_sendmsg+0x805/0x940 [ 37.407970] __sys_sendmsg+0x115/0x270 [ 37.411833] SyS_sendmsg+0x29/0x30 [ 37.415354] do_syscall_64+0x29e/0x9d0 [ 37.419227] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 37.424396] [ 37.426001] Freed by task 4462: [ 37.429269] save_stack+0x43/0xd0 [ 37.432702] __kasan_slab_free+0x11a/0x170 [ 37.436914] kasan_slab_free+0xe/0x10 [ 37.440700] kfree+0xd9/0x260 [ 37.443790] skb_free_head+0x99/0xc0 [ 37.447483] skb_release_data+0x690/0x860 [ 37.451609] skb_release_all+0x4a/0x60 [ 37.455474] kfree_skb+0x195/0x560 [ 37.459008] ip6_tnl_start_xmit+0xa44/0x2290 [ 37.463399] dev_hard_start_xmit+0x264/0xc10 [ 37.467787] __dev_queue_xmit+0x2724/0x34c0 [ 37.472085] dev_queue_xmit+0x17/0x20 [ 37.475867] packet_sendmsg+0x411d/0x6100 [ 37.479999] sock_sendmsg+0xd5/0x120 [ 37.483691] ___sys_sendmsg+0x805/0x940 [ 37.487642] __sys_sendmsg+0x115/0x270 [ 37.491506] SyS_sendmsg+0x29/0x30 [ 37.495027] do_syscall_64+0x29e/0x9d0 [ 37.498896] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 37.504075] [ 37.505684] The buggy address belongs to the object at ffff8801b5269ac0 [ 37.505684] which belongs to the cache kmalloc-512 of size 512 [ 37.518330] The buggy address is located 224 bytes inside of [ 37.518330] 512-byte region [ffff8801b5269ac0, ffff8801b5269cc0) [ 37.530186] The buggy address belongs to the page: [ 37.535093] page:ffffea0006d49a40 count:1 mapcount:0 mapping:ffff8801b52690c0 index:0x0 [ 37.543217] flags: 0x2fffc0000000100(slab) [ 37.547441] raw: 02fffc0000000100 ffff8801b52690c0 0000000000000000 0000000100000006 [ 37.555301] raw: ffffea0006d0c0a0 ffffea0006d31620 ffff8801dac00940 0000000000000000 [ 37.563155] page dumped because: kasan: bad access detected [ 37.568840] [ 37.570443] Memory state around the buggy address: [ 37.575350] ffff8801b5269a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 37.582686] ffff8801b5269b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.590021] >ffff8801b5269b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.597354] ^ [ 37.601739] ffff8801b5269c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.609074] ffff8801b5269c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 37.616407] ================================================================== [ 37.623747] Disabling lock debugging due to kernel taint [ 37.629430] Kernel panic - not syncing: panic_on_warn set ... [ 37.629430] [ 37.636783] CPU: 0 PID: 4462 Comm: syzkaller596824 Tainted: G B 4.16.0+ #19 [ 37.645159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.654505] Call Trace: [ 37.657074] dump_stack+0x1b9/0x294 [ 37.660686] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.665856] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.670590] ? skb_release_data+0xd0/0x860 [ 37.674802] panic+0x22f/0x4de [ 37.677969] ? add_taint.cold.5+0x16/0x16 [ 37.682104] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.686492] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.690881] ? skb_release_data+0x19b/0x860 [ 37.695186] kasan_end_report+0x47/0x4f [ 37.699140] kasan_report.cold.7+0xc9/0x2f5 [ 37.703442] check_memory_region+0x13e/0x1b0 [ 37.707836] kasan_check_write+0x14/0x20 [ 37.711874] skb_release_data+0x19b/0x860 [ 37.716001] ? skb_tx_error+0x2f0/0x2f0 [ 37.719951] ? kasan_check_read+0x11/0x20 [ 37.724076] ? rcu_is_watching+0x85/0x140 [ 37.728211] ? kasan_check_write+0x14/0x20 [ 37.732433] ? sock_rmem_free+0x6f/0x90 [ 37.736388] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.741920] skb_release_all+0x4a/0x60 [ 37.745784] kfree_skb+0x195/0x560 [ 37.749298] ? skb_queue_purge+0x19/0x40 [ 37.753335] ? __kfree_skb+0x20/0x20 [ 37.757027] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 37.761587] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 37.766667] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.771666] ? trace_hardirqs_on+0xd/0x10 [ 37.775792] ? skb_dequeue+0x12f/0x180 [ 37.779658] skb_queue_purge+0x19/0x40 [ 37.783527] packet_sock_destruct+0x93/0x290 [ 37.787910] ? packet_mm_close+0xc0/0xc0 [ 37.791959] ? graph_lock+0x170/0x170 [ 37.795738] ? __free_object+0x16e/0x330 [ 37.799788] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 37.805042] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 37.809606] ? packet_mm_close+0xc0/0xc0 [ 37.813654] __sk_destruct+0xff/0xa40 [ 37.817443] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 37.822350] ? graph_lock+0x170/0x170 [ 37.826128] ? lock_downgrade+0x8e0/0x8e0 [ 37.830254] ? __lock_is_held+0xb5/0x140 [ 37.834294] ? kasan_check_read+0x11/0x20 [ 37.838420] ? do_raw_spin_unlock+0x9e/0x2e0 [ 37.842806] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 37.847375] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 37.852460] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.857975] ? refcount_sub_and_test+0x212/0x330 [ 37.862707] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 37.867438] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 37.872171] ? pcpu_free_area+0xa90/0xa90 [ 37.876304] sk_destruct+0x78/0x90 [ 37.879820] __sk_free+0x22e/0x340 [ 37.883339] sk_free+0x42/0x50 [ 37.886511] packet_release+0xa18/0xd50 [ 37.890486] ? lock_downgrade+0x8e0/0x8e0 [ 37.894614] ? packet_lookup_frame+0x270/0x270 [ 37.899179] ? cpumask_weight.constprop.5+0x44/0x44 [ 37.904171] ? do_raw_spin_lock+0xc1/0x200 [ 37.908395] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.913908] ? locks_remove_file+0x3f7/0x5a0 [ 37.918294] ? fcntl_setlk+0x1020/0x1020 [ 37.922335] ? fsnotify+0x415/0x1100 [ 37.926028] ? fsnotify_first_mark+0x330/0x330 [ 37.930590] sock_release+0x96/0x1b0 [ 37.934284] ? sock_alloc_file+0x4e0/0x4e0 [ 37.938494] sock_close+0x16/0x20 [ 37.941927] __fput+0x34d/0x890 [ 37.945197] ? fput+0x1a0/0x1a0 [ 37.948458] ? check_same_owner+0x320/0x320 [ 37.952755] ____fput+0x15/0x20 [ 37.956011] task_work_run+0x1e4/0x290 [ 37.959875] ? task_work_cancel+0x240/0x240 [ 37.964180] ? switch_task_namespaces+0xbd/0xd0 [ 37.968828] do_exit+0x1aee/0x2730 [ 37.972356] ? do_raw_spin_unlock+0x31/0x2e0 [ 37.976742] ? mm_update_next_owner+0x980/0x980 [ 37.981391] ? kasan_check_write+0x14/0x20 [ 37.985622] ? do_raw_spin_lock+0xc1/0x200 [ 37.989845] ? trace_hardirqs_off+0xd/0x10 [ 37.994060] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 37.999152] ? debug_check_no_obj_freed+0x2ff/0x584 [ 38.004155] ? trace_hardirqs_off+0xd/0x10 [ 38.008368] ? quarantine_put+0xeb/0x190 [ 38.012405] ? kfree+0x111/0x260 [ 38.015749] ? ___sys_sendmsg+0x31a/0x940 [ 38.019877] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.024878] ? trace_hardirqs_on+0xd/0x10 [ 38.029004] ? ___sys_sendmsg+0x31f/0x940 [ 38.033131] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.038652] ? copy_msghdr_from_user+0x560/0x560 [ 38.043394] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 38.048125] ? graph_lock+0x170/0x170 [ 38.051907] ? graph_lock+0x170/0x170 [ 38.055684] ? find_held_lock+0x36/0x1c0 [ 38.059723] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.065237] ? __fget_light+0x2ef/0x430 [ 38.069197] ? fget_raw+0x20/0x20 [ 38.072636] ? find_held_lock+0x36/0x1c0 [ 38.076676] ? lock_downgrade+0x8e0/0x8e0 [ 38.080814] ? handle_mm_fault+0x8c0/0xc70 [ 38.085030] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.090544] ? sockfd_lookup_light+0xc5/0x160 [ 38.095019] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.100534] ? __sys_sendmsg+0x1aa/0x270 [ 38.104574] ? SyS_shutdown+0x30/0x30 [ 38.108356] ? __do_page_fault+0x441/0xe40 [ 38.112578] do_group_exit+0x16f/0x430 [ 38.116452] ? SyS_exit+0x30/0x30 [ 38.119892] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 38.124713] ? do_syscall_64+0xb7/0x9d0 [ 38.128666] ? do_group_exit+0x430/0x430 [ 38.132706] SyS_exit_group+0x1d/0x20 [ 38.136485] do_syscall_64+0x29e/0x9d0 [ 38.140349] ? vmalloc_sync_all+0x30/0x30 [ 38.144475] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 38.149210] ? syscall_return_slowpath+0x5c0/0x5c0 [ 38.154124] ? syscall_return_slowpath+0x30f/0x5c0 [ 38.159046] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 38.164388] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.169211] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 38.174377] RIP: 0033:0x4418d9 [ 38.177544] RSP: 002b:00007ffda4e03b88 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 38.185230] RAX: ffffffffffffffda RBX: 000000000000001b RCX: 00000000004418d9 [ 38.192478] RDX: 00000000004418d9 RSI: 0000000000000000 RDI: 0000000000000001 [ 38.199725] RBP: 00000000004a34d8 R08: 000000000078e6b0 R09: 00000000006cd018 [ 38.206973] R10: 000000000078e6b0 R11: 0000000000000206 R12: 00007ffda4e03c98 [ 38.214230] R13: 0000000000402660 R14: 0000000000000000 R15: 0000000000000000 [ 38.221879] Dumping ftrace buffer: [ 38.225395] (ftrace buffer empty) [ 38.229091] Kernel Offset: disabled [ 38.232697] Rebooting in 86400 seconds..