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 '10.128.0.15' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 syzkaller login: [ 30.759895] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 30.952827] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.959282] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.966787] device bridge_slave_0 entered promiscuous mode [ 30.982565] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.988920] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.995951] device bridge_slave_1 entered promiscuous mode [ 31.010669] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 31.025672] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 31.064732] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 31.082012] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 31.141253] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 31.148484] team0: Port device team_slave_0 added [ 31.162394] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 31.169463] team0: Port device team_slave_1 added [ 31.184995] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 31.201275] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 31.217180] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 31.233496] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 31.345134] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.351586] bridge0: port 2(bridge_slave_1) entered forwarding state [ 31.358535] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.364891] bridge0: port 1(bridge_slave_0) entered forwarding state 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 [ 31.769365] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.775494] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.816650] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.858769] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.867799] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 31.904731] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 32.153127] ================================================================== [ 32.160588] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 [ 32.167233] Write of size 4 at addr ffff8801d34ea660 by task syzkaller052544/4490 [ 32.174823] [ 32.176435] CPU: 0 PID: 4490 Comm: syzkaller052544 Not tainted 4.16.0+ #1 [ 32.183341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.192673] Call Trace: [ 32.195244] dump_stack+0x1b9/0x294 [ 32.198851] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.204026] ? printk+0x9e/0xba [ 32.207287] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 32.212030] ? kasan_check_write+0x14/0x20 [ 32.216246] print_address_description+0x6c/0x20b [ 32.221067] ? skb_release_data+0x19b/0x860 [ 32.225368] kasan_report.cold.7+0x242/0x2fe [ 32.229756] check_memory_region+0x13e/0x1b0 [ 32.234143] kasan_check_write+0x14/0x20 [ 32.238180] skb_release_data+0x19b/0x860 [ 32.242314] ? skb_tx_error+0x2f0/0x2f0 [ 32.246267] ? kasan_check_read+0x11/0x20 [ 32.250391] ? rcu_is_watching+0x85/0x140 [ 32.254517] ? kasan_check_write+0x14/0x20 [ 32.258736] ? sock_rmem_free+0x6f/0x90 [ 32.262694] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.268209] skb_release_all+0x4a/0x60 [ 32.272073] kfree_skb+0x195/0x560 [ 32.275591] ? skb_queue_purge+0x19/0x40 [ 32.279632] ? __kfree_skb+0x20/0x20 [ 32.283335] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.287896] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.292977] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.297978] ? trace_hardirqs_on+0xd/0x10 [ 32.302115] ? skb_dequeue+0x12f/0x180 [ 32.305990] skb_queue_purge+0x19/0x40 [ 32.309862] packet_sock_destruct+0x93/0x290 [ 32.314249] ? packet_mm_close+0xc0/0xc0 [ 32.318287] ? graph_lock+0x170/0x170 [ 32.322067] ? __free_object+0x16e/0x330 [ 32.326106] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 32.331361] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.335921] ? packet_mm_close+0xc0/0xc0 [ 32.339960] __sk_destruct+0xff/0xa40 [ 32.343743] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 32.348657] ? graph_lock+0x170/0x170 [ 32.352435] ? lock_downgrade+0x8e0/0x8e0 [ 32.356561] ? __lock_is_held+0xb5/0x140 [ 32.360599] ? kasan_check_read+0x11/0x20 [ 32.364726] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.369114] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 32.373675] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.378759] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.384275] ? refcount_sub_and_test+0x212/0x330 [ 32.389018] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.393758] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 32.398490] ? pcpu_free_area+0xa90/0xa90 [ 32.402621] sk_destruct+0x78/0x90 [ 32.406141] __sk_free+0x22e/0x340 [ 32.409664] sk_free+0x42/0x50 [ 32.412838] packet_release+0xa18/0xd50 [ 32.416791] ? lock_downgrade+0x8e0/0x8e0 [ 32.420918] ? packet_lookup_frame+0x270/0x270 [ 32.425479] ? cpumask_weight.constprop.5+0x44/0x44 [ 32.430475] ? do_raw_spin_lock+0xc1/0x200 [ 32.434697] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.440225] ? locks_remove_file+0x3f7/0x5a0 [ 32.444620] ? fcntl_setlk+0x1020/0x1020 [ 32.448662] ? fsnotify+0x415/0x1100 [ 32.452356] ? fsnotify_first_mark+0x330/0x330 [ 32.456919] sock_release+0x96/0x1b0 [ 32.460611] ? sock_alloc_file+0x4e0/0x4e0 [ 32.464823] sock_close+0x16/0x20 [ 32.468255] __fput+0x34d/0x890 [ 32.471515] ? fput+0x1a0/0x1a0 [ 32.474779] ? check_same_owner+0x320/0x320 [ 32.479079] ____fput+0x15/0x20 [ 32.482336] task_work_run+0x1e4/0x290 [ 32.486203] ? task_work_cancel+0x240/0x240 [ 32.490507] ? switch_task_namespaces+0xbd/0xd0 [ 32.495157] do_exit+0x1aee/0x2730 [ 32.498675] ? lock_release+0xa10/0xa10 [ 32.502630] ? mm_update_next_owner+0x980/0x980 [ 32.507280] ? graph_lock+0x170/0x170 [ 32.511056] ? import_iovec+0x24b/0x420 [ 32.515009] ? dup_iter+0x270/0x270 [ 32.518627] ? find_held_lock+0x36/0x1c0 [ 32.522675] ? lock_downgrade+0x8e0/0x8e0 [ 32.526805] ? rcu_is_watching+0x85/0x140 [ 32.530933] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 32.536106] ? wake_up_q+0x100/0x100 [ 32.539799] ? find_held_lock+0x36/0x1c0 [ 32.543839] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.549355] ? tun_chr_read_iter+0x17e/0x1e0 [ 32.553744] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.559263] ? __vfs_read+0x117/0x970 [ 32.563047] ? vfs_copy_file_range+0xb80/0xb80 [ 32.567610] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.573136] ? fsnotify+0x415/0x1100 [ 32.576831] ? fsnotify_first_mark+0x330/0x330 [ 32.581400] ? rw_verify_area+0x118/0x360 [ 32.585526] ? vfs_read+0x1ce/0x3d0 [ 32.589140] do_group_exit+0x16f/0x430 [ 32.593010] ? SyS_exit+0x30/0x30 [ 32.596450] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.601271] ? do_syscall_64+0xb7/0x9d0 [ 32.605225] ? do_group_exit+0x430/0x430 [ 32.609265] SyS_exit_group+0x1d/0x20 [ 32.613048] do_syscall_64+0x29e/0x9d0 [ 32.616912] ? vmalloc_sync_all+0x30/0x30 [ 32.621039] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.625773] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.630683] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.635595] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 32.640939] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.645764] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.650934] RIP: 0033:0x441759 [ 32.654101] RSP: 002b:00007ffee33851d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 32.661788] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441759 [ 32.669035] RDX: 0000000000000000 RSI: 00000000000003e8 RDI: 0000000000000001 [ 32.676288] RBP: 00000000006cd018 R08: 0000000000000000 R09: 00000000006cd018 [ 32.683545] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000402510 [ 32.690803] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 32.698064] [ 32.699669] Allocated by task 4490: [ 32.703284] save_stack+0x43/0xd0 [ 32.706716] kasan_kmalloc+0xc4/0xe0 [ 32.710407] __kmalloc_node_track_caller+0x47/0x70 [ 32.715313] __kmalloc_reserve.isra.38+0x3a/0xe0 [ 32.720049] __alloc_skb+0x14d/0x780 [ 32.723739] alloc_skb_with_frags+0x137/0x760 [ 32.728211] sock_alloc_send_pskb+0x87a/0xae0 [ 32.732690] packet_sendmsg+0x1bd1/0x60b0 [ 32.736815] sock_sendmsg+0xd5/0x120 [ 32.740513] ___sys_sendmsg+0x805/0x940 [ 32.744462] __sys_sendmsg+0x115/0x270 [ 32.748332] SyS_sendmsg+0x29/0x30 [ 32.751851] do_syscall_64+0x29e/0x9d0 [ 32.755715] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.760875] [ 32.762479] Freed by task 4490: [ 32.765739] save_stack+0x43/0xd0 [ 32.769175] __kasan_slab_free+0x11a/0x170 [ 32.773386] kasan_slab_free+0xe/0x10 [ 32.777165] kfree+0xd9/0x260 [ 32.780255] skb_free_head+0x99/0xc0 [ 32.783951] skb_release_data+0x690/0x860 [ 32.788083] skb_release_all+0x4a/0x60 [ 32.791947] kfree_skb+0x195/0x560 [ 32.795468] ip6_tnl_start_xmit+0xa44/0x2290 [ 32.799854] dev_hard_start_xmit+0x264/0xc10 [ 32.804239] __dev_queue_xmit+0x2724/0x34c0 [ 32.808539] dev_queue_xmit+0x17/0x20 [ 32.812317] packet_sendmsg+0x411c/0x60b0 [ 32.816450] sock_sendmsg+0xd5/0x120 [ 32.820140] ___sys_sendmsg+0x805/0x940 [ 32.824091] __sys_sendmsg+0x115/0x270 [ 32.827953] SyS_sendmsg+0x29/0x30 [ 32.831473] do_syscall_64+0x29e/0x9d0 [ 32.835340] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 32.840501] [ 32.842108] The buggy address belongs to the object at ffff8801d34ea580 [ 32.842108] which belongs to the cache kmalloc-512 of size 512 [ 32.854750] The buggy address is located 224 bytes inside of [ 32.854750] 512-byte region [ffff8801d34ea580, ffff8801d34ea780) [ 32.866606] The buggy address belongs to the page: [ 32.871518] page:ffffea00074d3a80 count:1 mapcount:0 mapping:ffff8801d34ea080 index:0x0 [ 32.879640] flags: 0x2fffc0000000100(slab) [ 32.883856] raw: 02fffc0000000100 ffff8801d34ea080 0000000000000000 0000000100000006 [ 32.891719] raw: ffffea0007500360 ffffea00074d3b60 ffff8801dac00940 0000000000000000 [ 32.899578] page dumped because: kasan: bad access detected [ 32.905259] [ 32.906861] Memory state around the buggy address: [ 32.911771] ffff8801d34ea500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 32.919106] ffff8801d34ea580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.926442] >ffff8801d34ea600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.933773] ^ [ 32.940241] ffff8801d34ea680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.947576] ffff8801d34ea700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 32.954907] ================================================================== [ 32.962237] Disabling lock debugging due to kernel taint [ 32.968222] Kernel panic - not syncing: panic_on_warn set ... [ 32.968222] [ 32.975597] CPU: 0 PID: 4490 Comm: syzkaller052544 Tainted: G B 4.16.0+ #1 [ 32.983902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.993235] Call Trace: [ 32.995808] dump_stack+0x1b9/0x294 [ 32.999413] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.004580] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.009312] ? skb_release_data+0xd0/0x860 [ 33.013524] panic+0x22f/0x4de [ 33.016695] ? add_taint.cold.5+0x16/0x16 [ 33.020823] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.025209] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.029597] ? skb_release_data+0x19b/0x860 [ 33.033999] kasan_end_report+0x47/0x4f [ 33.037962] kasan_report.cold.7+0x76/0x2fe [ 33.042262] check_memory_region+0x13e/0x1b0 [ 33.046647] kasan_check_write+0x14/0x20 [ 33.050693] skb_release_data+0x19b/0x860 [ 33.054819] ? skb_tx_error+0x2f0/0x2f0 [ 33.058768] ? kasan_check_read+0x11/0x20 [ 33.062890] ? rcu_is_watching+0x85/0x140 [ 33.067021] ? kasan_check_write+0x14/0x20 [ 33.071234] ? sock_rmem_free+0x6f/0x90 [ 33.075185] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.080703] skb_release_all+0x4a/0x60 [ 33.084574] kfree_skb+0x195/0x560 [ 33.088090] ? skb_queue_purge+0x19/0x40 [ 33.092134] ? __kfree_skb+0x20/0x20 [ 33.095837] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.100399] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.105479] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.110470] ? trace_hardirqs_on+0xd/0x10 [ 33.114598] ? skb_dequeue+0x12f/0x180 [ 33.118463] skb_queue_purge+0x19/0x40 [ 33.122327] packet_sock_destruct+0x93/0x290 [ 33.126710] ? packet_mm_close+0xc0/0xc0 [ 33.130752] ? graph_lock+0x170/0x170 [ 33.134537] ? __free_object+0x16e/0x330 [ 33.138576] ? __list_del_entry_valid.cold.1+0x58/0x58 [ 33.143835] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.148392] ? packet_mm_close+0xc0/0xc0 [ 33.152431] __sk_destruct+0xff/0xa40 [ 33.156210] ? sock_warn_obsolete_bsdism+0xb0/0xb0 [ 33.161116] ? graph_lock+0x170/0x170 [ 33.164893] ? lock_downgrade+0x8e0/0x8e0 [ 33.169028] ? __lock_is_held+0xb5/0x140 [ 33.173068] ? kasan_check_read+0x11/0x20 [ 33.177191] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.181578] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.186161] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.191243] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.196757] ? refcount_sub_and_test+0x212/0x330 [ 33.201489] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.206219] ? refcount_inc_not_zero+0x2d0/0x2d0 [ 33.210951] ? pcpu_free_area+0xa90/0xa90 [ 33.215082] sk_destruct+0x78/0x90 [ 33.218601] __sk_free+0x22e/0x340 [ 33.222127] sk_free+0x42/0x50 [ 33.225303] packet_release+0xa18/0xd50 [ 33.229253] ? lock_downgrade+0x8e0/0x8e0 [ 33.233390] ? packet_lookup_frame+0x270/0x270 [ 33.237948] ? cpumask_weight.constprop.5+0x44/0x44 [ 33.242945] ? do_raw_spin_lock+0xc1/0x200 [ 33.247159] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.252677] ? locks_remove_file+0x3f7/0x5a0 [ 33.257062] ? fcntl_setlk+0x1020/0x1020 [ 33.261100] ? fsnotify+0x415/0x1100 [ 33.264791] ? fsnotify_first_mark+0x330/0x330 [ 33.269359] sock_release+0x96/0x1b0 [ 33.273051] ? sock_alloc_file+0x4e0/0x4e0 [ 33.277262] sock_close+0x16/0x20 [ 33.280689] __fput+0x34d/0x890 [ 33.283944] ? fput+0x1a0/0x1a0 [ 33.287207] ? check_same_owner+0x320/0x320 [ 33.291513] ____fput+0x15/0x20 [ 33.294770] task_work_run+0x1e4/0x290 [ 33.298638] ? task_work_cancel+0x240/0x240 [ 33.302939] ? switch_task_namespaces+0xbd/0xd0 [ 33.307588] do_exit+0x1aee/0x2730 [ 33.311106] ? lock_release+0xa10/0xa10 [ 33.315066] ? mm_update_next_owner+0x980/0x980 [ 33.319711] ? graph_lock+0x170/0x170 [ 33.323488] ? import_iovec+0x24b/0x420 [ 33.327436] ? dup_iter+0x270/0x270 [ 33.331043] ? find_held_lock+0x36/0x1c0 [ 33.335085] ? lock_downgrade+0x8e0/0x8e0 [ 33.339312] ? rcu_is_watching+0x85/0x140 [ 33.343438] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.348622] ? wake_up_q+0x100/0x100 [ 33.352338] ? find_held_lock+0x36/0x1c0 [ 33.356379] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.361895] ? tun_chr_read_iter+0x17e/0x1e0 [ 33.366280] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.371793] ? __vfs_read+0x117/0x970 [ 33.375573] ? vfs_copy_file_range+0xb80/0xb80 [ 33.380134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.385647] ? fsnotify+0x415/0x1100 [ 33.389338] ? fsnotify_first_mark+0x330/0x330 [ 33.393897] ? rw_verify_area+0x118/0x360 [ 33.398030] ? vfs_read+0x1ce/0x3d0 [ 33.401636] do_group_exit+0x16f/0x430 [ 33.405500] ? SyS_exit+0x30/0x30 [ 33.408930] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.413746] ? do_syscall_64+0xb7/0x9d0 [ 33.417695] ? do_group_exit+0x430/0x430 [ 33.421733] SyS_exit_group+0x1d/0x20 [ 33.425508] do_syscall_64+0x29e/0x9d0 [ 33.429374] ? vmalloc_sync_all+0x30/0x30 [ 33.433498] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.438229] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.443134] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.448044] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 33.453391] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.458212] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.463378] RIP: 0033:0x441759 [ 33.466550] RSP: 002b:00007ffee33851d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.474233] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441759 [ 33.481480] RDX: 0000000000000000 RSI: 00000000000003e8 RDI: 0000000000000001 [ 33.488738] RBP: 00000000006cd018 R08: 0000000000000000 R09: 00000000006cd018 [ 33.495997] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000402510 [ 33.503248] R13: 00000000004025a0 R14: 0000000000000000 R15: 0000000000000000 [ 33.511041] Dumping ftrace buffer: [ 33.514562] (ftrace buffer empty) [ 33.518245] Kernel Offset: disabled [ 33.521848] Rebooting in 86400 seconds..