[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.508866] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.603097] random: sshd: uninitialized urandom read (32 bytes read) [ 25.916758] random: sshd: uninitialized urandom read (32 bytes read) [ 26.780728] random: sshd: uninitialized urandom read (32 bytes read) [ 26.938391] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 32.363661] random: sshd: uninitialized urandom read (32 bytes read) net.ipv6.conf.syz_tun.accept_dad = 0 [ 32.459232] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 executing program [ 32.602712] ------------[ cut here ]------------ [ 32.607567] kernel BUG at net/ipv6/route.c:1268! [ 32.612382] invalid opcode: 0000 [#1] SMP KASAN [ 32.617056] CPU: 1 PID: 4456 Comm: syz-executor876 Not tainted 4.18.0-rc7+ #169 [ 32.624489] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.633841] RIP: 0010:ip6_pol_route+0x9e3/0x1250 [ 32.638577] 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 bb 14 c7 fb 4d 85 e4 0f 84 0d fa ff ff e8 7d 13 c7 fb <0f> 0b e8 76 13 c7 fb e8 d1 7f b1 fb 31 ff 89 c6 88 85 e0 fd ff ff [ 32.657740] RSP: 0018:ffff8801ab576d48 EFLAGS: 00010293 [ 32.663090] RAX: ffff8801b1588780 RBX: ffffe8ffffd5c8d8 RCX: ffffffff85b504c5 [ 32.670346] RDX: 0000000000000000 RSI: ffffffff85b504d3 RDI: 0000000000000007 [ 32.677603] RBP: ffff8801ab576f78 R08: ffff8801b1588780 R09: fffff91ffffab91b [ 32.684860] R10: fffff91ffffab91b R11: ffffe8ffffd5c8df R12: ffff8801b20c6180 [ 32.692117] R13: 0000000000000001 R14: ffff8801b20c62c0 R15: 0000000000000001 [ 32.699375] FS: 00007f30b2f07700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 32.707597] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.713473] CR2: 00000000205fafd2 CR3: 00000001ab592000 CR4: 00000000001406e0 [ 32.720734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.727993] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.735249] Call Trace: [ 32.737829] ? ip6_pol_route_lookup+0x1120/0x1120 [ 32.742673] ? __lock_acquire+0x7fc/0x5020 [ 32.746898] ? print_usage_bug+0xc0/0xc0 [ 32.750952] ? graph_lock+0x170/0x170 [ 32.754743] ? graph_lock+0x170/0x170 [ 32.758529] ? print_usage_bug+0xc0/0xc0 [ 32.762583] ? find_held_lock+0x36/0x1c0 [ 32.766635] ip6_pol_route_output+0x54/0x70 [ 32.770946] fib6_rule_lookup+0x26e/0x700 [ 32.775082] ? ip6_pol_route_input+0x80/0x80 [ 32.779492] ? fib6_lookup+0x480/0x480 [ 32.783366] ? rcu_is_watching+0x8c/0x150 [ 32.787501] ? trace_hardirqs_on+0x10/0x10 [ 32.791736] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 32.796182] ip6_route_output_flags+0x2c5/0x350 [ 32.800848] ip6_dst_lookup_tail+0x1278/0x1da0 [ 32.805422] ? kernel_text_address+0x79/0xf0 [ 32.809819] ? unwind_get_return_address+0x61/0xa0 [ 32.814742] ? dst_output+0x180/0x180 [ 32.818544] ? graph_lock+0x170/0x170 [ 32.822334] ? graph_lock+0x170/0x170 [ 32.826125] ? __lock_acquire+0x7fc/0x5020 [ 32.830349] ? save_stack+0xa9/0xd0 [ 32.833971] ? __lock_is_held+0xb5/0x140 [ 32.838026] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.843550] ? __sk_dst_check+0x1ef/0x410 [ 32.847689] ip6_dst_lookup_flow+0xc8/0x270 [ 32.852004] ? ip6_dst_lookup+0x60/0x60 [ 32.855975] inet6_csk_route_socket+0x8cb/0x1030 [ 32.860717] ? ip6_dst_check+0x3b1/0xaf0 [ 32.864767] ? inet6_csk_route_req+0x820/0x820 [ 32.869338] ? skb_free_head+0x99/0xc0 [ 32.873218] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 32.878222] ? trace_hardirqs_on+0xd/0x10 [ 32.882362] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 32.887888] ? graph_lock+0x170/0x170 [ 32.891679] ? kasan_check_write+0x14/0x20 [ 32.895906] ? pskb_expand_head+0x6b3/0x10e0 [ 32.900309] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.905320] ? kmem_cache_alloc_node_trace+0x34e/0x770 [ 32.910595] inet6_csk_xmit+0x118/0x630 [ 32.914560] ? inet6_csk_xmit+0x118/0x630 [ 32.918699] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.924225] ? inet6_csk_update_pmtu+0x190/0x190 [ 32.928973] ? __sk_dst_check+0x1ef/0x410 [ 32.933107] ? sock_alloc_send_skb+0x40/0x40 [ 32.937510] l2tp_xmit_skb+0x1406/0x17c0 [ 32.941564] ? l2tp_session_create+0xb60/0xb60 [ 32.946138] ? iov_iter_advance+0x14e0/0x14e0 [ 32.950623] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.956149] ? _copy_from_user+0xdf/0x150 [ 32.960286] ? pppol2tp_sendmsg+0x45a/0x6c0 [ 32.964685] pppol2tp_sendmsg+0x4ae/0x6c0 [ 32.968826] ? move_addr_to_kernel.part.20+0x100/0x100 [ 32.974096] ? pppol2tp_getsockopt+0x950/0x950 [ 32.978667] sock_sendmsg+0xd5/0x120 [ 32.982373] ___sys_sendmsg+0x51d/0x930 [ 32.986338] ? graph_lock+0x170/0x170 [ 32.990128] ? copy_msghdr_from_user+0x580/0x580 [ 32.994887] ? __schedule+0x884/0x1ec0 [ 32.998771] ? find_held_lock+0x36/0x1c0 [ 33.002825] ? lock_downgrade+0x8f0/0x8f0 [ 33.006969] ? rcu_note_context_switch+0x730/0x730 [ 33.011891] ? check_same_owner+0x340/0x340 [ 33.016209] __sys_sendmmsg+0x240/0x6f0 [ 33.021303] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 33.025626] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.031152] ? fput+0x130/0x1a0 [ 33.034425] ? __sys_connect+0x1d1/0x4c0 [ 33.038474] ? __ia32_sys_accept+0xb0/0xb0 [ 33.042725] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 33.047299] __x64_sys_sendmmsg+0x9d/0x100 [ 33.051525] do_syscall_64+0x1b9/0x820 [ 33.055398] ? finish_task_switch+0x1d3/0x870 [ 33.059881] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.064814] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.069741] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.075104] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.079935] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.085113] RIP: 0033:0x447ba9 [ 33.088290] Code: e8 0c bf 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 ab 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 33.107451] RSP: 002b:00007f30b2f06ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 33.115148] RAX: ffffffffffffffda RBX: 00000000006f0028 RCX: 0000000000447ba9 [ 33.122406] RDX: 00000000000003e8 RSI: 0000000020005fc0 RDI: 0000000000000004 [ 33.129662] RBP: 00000000006f0020 R08: 0000000000000000 R09: 0000000000000000 [ 33.136920] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006f002c [ 33.144181] R13: 00000000007ffe7f R14: 00007f30b2f079c0 R15: 0000000000000019 [ 33.151439] Modules linked in: [ 33.154630] Dumping ftrace buffer: [ 33.158153] (ftrace buffer empty) [ 33.161911] ---[ end trace 883ff6f67c449d09 ]--- [ 33.166707] RIP: 0010:ip6_pol_route+0x9e3/0x1250 [ 33.171485] 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 bb 14 c7 fb 4d 85 e4 0f 84 0d fa ff ff e8 7d 13 c7 fb <0f> 0b e8 76 13 c7 fb e8 d1 7f b1 fb 31 ff 89 c6 88 85 e0 fd ff ff [ 33.190762] RSP: 0018:ffff8801ab576d48 EFLAGS: 00010293 [ 33.196147] RAX: ffff8801b1588780 RBX: ffffe8ffffd5c8d8 RCX: ffffffff85b504c5 [ 33.203462] RDX: 0000000000000000 RSI: ffffffff85b504d3 RDI: 0000000000000007 [ 33.210750] RBP: ffff8801ab576f78 R08: ffff8801b1588780 R09: fffff91ffffab91b [ 33.218049] R10: fffff91ffffab91b R11: ffffe8ffffd5c8df R12: ffff8801b20c6180 [ 33.225331] R13: 0000000000000001 R14: ffff8801b20c62c0 R15: 0000000000000001 [ 33.232621] FS: 00007f30b2f07700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 33.240863] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.246758] CR2: 00000000205fafd2 CR3: 00000001ab592000 CR4: 00000000001406e0 [ 33.254052] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.261341] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.268628] Kernel panic - not syncing: Fatal exception in interrupt [ 33.275658] Dumping ftrace buffer: [ 33.279185] (ftrace buffer empty) [ 33.282878] Kernel Offset: disabled [ 33.286491] Rebooting in 86400 seconds..