[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.849556] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.468508] random: sshd: uninitialized urandom read (32 bytes read) [ 24.933351] random: sshd: uninitialized urandom read (32 bytes read) [ 25.809353] random: sshd: uninitialized urandom read (32 bytes read) [ 25.974991] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 31.397424] random: sshd: uninitialized urandom read (32 bytes read) net.ipv6.conf.syz_tun.accept_dad = 0 [ 31.494823] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 executing program [ 31.630488] ------------[ cut here ]------------ [ 31.635419] kernel BUG at net/ipv6/route.c:1268! [ 31.640245] invalid opcode: 0000 [#1] SMP KASAN [ 31.644923] CPU: 1 PID: 4452 Comm: syz-executor952 Not tainted 4.18.0-rc7+ #171 [ 31.652356] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.661713] RIP: 0010:ip6_pol_route+0x9e3/0x1250 [ 31.666603] Code: 31 e4 e8 80 df 04 fc 4c 89 e0 f0 4c 0f b1 33 31 ff 49 89 c4 48 89 c6 e8 9b 13 c7 fb 4d 85 e4 0f 84 0d fa ff ff e8 5d 12 c7 fb <0f> 0b e8 56 12 c7 fb e8 b1 7e b1 fb 31 ff 89 c6 88 85 e0 fd ff ff [ 31.685790] RSP: 0018:ffff8801acbaed48 EFLAGS: 00010293 [ 31.691145] RAX: ffff8801acb66780 RBX: ffffe8ffffd5c8d8 RCX: ffffffff85b50535 [ 31.698410] RDX: 0000000000000000 RSI: ffffffff85b50543 RDI: 0000000000000007 [ 31.706150] RBP: ffff8801acbaef78 R08: ffff8801acb66780 R09: fffff91ffffab91b [ 31.713421] R10: fffff91ffffab91b R11: ffffe8ffffd5c8df R12: ffff8801afe4e080 [ 31.720687] R13: 0000000000000001 R14: ffff8801afe4e1c0 R15: 0000000000000001 [ 31.727950] FS: 00007fd8edca9700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 31.736160] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.742033] CR2: 00000000205fafd2 CR3: 00000001ac95b000 CR4: 00000000001406e0 [ 31.749306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.756563] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.763820] Call Trace: [ 31.766402] ? ip6_pol_route_lookup+0x1120/0x1120 [ 31.771242] ? __lock_acquire+0x7fc/0x5020 [ 31.775460] ? print_usage_bug+0xc0/0xc0 [ 31.779503] ? print_usage_bug+0xc0/0xc0 [ 31.783546] ? graph_lock+0x170/0x170 [ 31.787325] ? graph_lock+0x170/0x170 [ 31.791106] ? print_usage_bug+0xc0/0xc0 [ 31.795170] ? find_held_lock+0x36/0x1c0 [ 31.799226] ip6_pol_route_output+0x54/0x70 [ 31.803537] fib6_rule_lookup+0x26e/0x700 [ 31.807674] ? ip6_pol_route_input+0x80/0x80 [ 31.812070] ? fib6_lookup+0x480/0x480 [ 31.815949] ? rcu_is_watching+0x8c/0x150 [ 31.820093] ? trace_hardirqs_on+0x10/0x10 [ 31.824312] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 31.828711] ip6_route_output_flags+0x2c5/0x350 [ 31.833368] ip6_dst_lookup_tail+0x1278/0x1da0 [ 31.837945] ? kernel_text_address+0x79/0xf0 [ 31.842349] ? unwind_get_return_address+0x61/0xa0 [ 31.847270] ? dst_output+0x180/0x180 [ 31.851063] ? graph_lock+0x170/0x170 [ 31.854864] ? graph_lock+0x170/0x170 [ 31.858661] ? __lock_acquire+0x7fc/0x5020 [ 31.862886] ? save_stack+0xa9/0xd0 [ 31.866502] ? __lock_is_held+0xb5/0x140 [ 31.870558] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.876086] ? __sk_dst_check+0x1ef/0x410 [ 31.880229] ip6_dst_lookup_flow+0xc8/0x270 [ 31.884545] ? ip6_dst_lookup+0x60/0x60 [ 31.888529] inet6_csk_route_socket+0x8cb/0x1030 [ 31.893274] ? ip6_dst_check+0x441/0xaf0 [ 31.897318] ? inet6_csk_route_req+0x820/0x820 [ 31.901893] ? skb_free_head+0x99/0xc0 [ 31.905771] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 31.910777] ? trace_hardirqs_on+0xd/0x10 [ 31.914937] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.920463] ? graph_lock+0x170/0x170 [ 31.924283] ? kasan_check_write+0x14/0x20 [ 31.928512] ? pskb_expand_head+0x6b3/0x10e0 [ 31.932906] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.937912] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 31.943186] inet6_csk_xmit+0x118/0x630 [ 31.947166] ? inet6_csk_xmit+0x118/0x630 [ 31.951320] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.956865] ? inet6_csk_update_pmtu+0x190/0x190 [ 31.961609] ? __sk_dst_check+0x1ef/0x410 [ 31.965744] ? sock_alloc_send_skb+0x40/0x40 [ 31.970142] l2tp_xmit_skb+0x1406/0x17c0 [ 31.974188] ? l2tp_session_create+0xb60/0xb60 [ 31.978755] ? iov_iter_advance+0x14e0/0x14e0 [ 31.983233] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.988754] ? _copy_from_user+0xdf/0x150 [ 31.992899] ? pppol2tp_sendmsg+0x45a/0x6c0 [ 31.997218] pppol2tp_sendmsg+0x4ae/0x6c0 [ 32.001376] ? move_addr_to_kernel.part.20+0x100/0x100 [ 32.006654] ? pppol2tp_getsockopt+0x950/0x950 [ 32.011234] sock_sendmsg+0xd5/0x120 [ 32.014936] ___sys_sendmsg+0x51d/0x930 [ 32.018904] ? graph_lock+0x170/0x170 [ 32.022696] ? copy_msghdr_from_user+0x580/0x580 [ 32.027451] ? find_held_lock+0x36/0x1c0 [ 32.031591] ? lock_downgrade+0x8f0/0x8f0 [ 32.035732] ? rcu_note_context_switch+0x730/0x730 [ 32.040665] ? check_same_owner+0x340/0x340 [ 32.044979] __sys_sendmmsg+0x240/0x6f0 [ 32.048945] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.053253] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.058776] ? fput+0x130/0x1a0 [ 32.062053] ? __sys_connect+0x1d1/0x4c0 [ 32.066108] ? __ia32_sys_accept+0xb0/0xb0 [ 32.070340] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 32.074922] __x64_sys_sendmmsg+0x9d/0x100 [ 32.079154] do_syscall_64+0x1b9/0x820 [ 32.083035] ? finish_task_switch+0x1d3/0x870 [ 32.087519] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.092443] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.097389] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.102745] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.107592] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.112783] RIP: 0033:0x447799 [ 32.115991] Code: e8 9c b9 02 00 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 32.135182] RSP: 002b:00007fd8edca8ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 32.142893] RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 0000000000447799 [ 32.150182] RDX: 00000000000003e8 RSI: 0000000020005fc0 RDI: 0000000000000004 [ 32.157441] RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000 [ 32.164702] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c [ 32.171961] R13: 00007ffff22a068f R14: 00007fd8edca99c0 R15: 0000000000000000 [ 32.179219] Modules linked in: [ 32.182400] Dumping ftrace buffer: [ 32.185929] (ftrace buffer empty) [ 32.189660] ---[ end trace eb21caeb127f7ab5 ]--- [ 32.194450] RIP: 0010:ip6_pol_route+0x9e3/0x1250 [ 32.199238] Code: 31 e4 e8 80 df 04 fc 4c 89 e0 f0 4c 0f b1 33 31 ff 49 89 c4 48 89 c6 e8 9b 13 c7 fb 4d 85 e4 0f 84 0d fa ff ff e8 5d 12 c7 fb <0f> 0b e8 56 12 c7 fb e8 b1 7e b1 fb 31 ff 89 c6 88 85 e0 fd ff ff [ 32.218502] RSP: 0018:ffff8801acbaed48 EFLAGS: 00010293 [ 32.223886] RAX: ffff8801acb66780 RBX: ffffe8ffffd5c8d8 RCX: ffffffff85b50535 [ 32.231192] RDX: 0000000000000000 RSI: ffffffff85b50543 RDI: 0000000000000007 [ 32.238481] RBP: ffff8801acbaef78 R08: ffff8801acb66780 R09: fffff91ffffab91b [ 32.245774] R10: fffff91ffffab91b R11: ffffe8ffffd5c8df R12: ffff8801afe4e080 [ 32.253434] R13: 0000000000000001 R14: ffff8801afe4e1c0 R15: 0000000000000001 [ 32.260726] FS: 00007fd8edca9700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 32.268991] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.274908] CR2: 00000000205fafd2 CR3: 00000001ac95b000 CR4: 00000000001406e0 [ 32.282218] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.289519] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.296826] Kernel panic - not syncing: Fatal exception in interrupt [ 32.303805] Dumping ftrace buffer: [ 32.307352] (ftrace buffer empty) [ 32.311077] Kernel Offset: disabled [ 32.315131] Rebooting in 86400 seconds..