[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.470218] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 13.336224] random: sshd: uninitialized urandom read (32 bytes read) [ 13.598038] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.430180] random: sshd: uninitialized urandom read (32 bytes read) [ 22.211294] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 27.682768] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 21:57:46 parsed 1 programs [ 28.761930] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 21:57:48 executed programs: 0 [ 29.783069] IPVS: Creating netns size=2536 id=1 [ 29.908626] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.920399] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.963507] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.974809] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.018056] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.029712] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.041894] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.062709] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.575324] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.601155] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 30.607484] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 30.614185] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.824015] hrtimer: interrupt took 27014 ns [ 30.905356] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 30.929830] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 30.938111] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 30.944797] PGD 1d8719067 [ 30.947444] PUD 1d6f89067 PMD 0 [ 30.950991] [ 30.952613] Oops: 0002 [#1] PREEMPT SMP KASAN [ 30.957080] Dumping ftrace buffer: [ 30.960593] (ftrace buffer empty) [ 30.964337] Modules linked in: [ 30.967654] CPU: 0 PID: 4232 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 30.975388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.984721] task: ffff8801d6858000 task.stack: ffff8801d5638000 [ 30.990750] RIP: 0010:[<ffffffff836c8e30>] [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 30.999873] RSP: 0018:ffff8801d563fac0 EFLAGS: 00010246 [ 31.005299] RAX: 0000000000000000 RBX: ffff8801d6e64f00 RCX: 1ffff1003ad0b11d [ 31.012645] RDX: 1ffff1003adcca60 RSI: ffff8801d68588c8 RDI: ffff8801d6e65300 [ 31.019893] RBP: ffff8801d563fb60 R08: ffff8801d68588e8 R09: 0000000000000000 [ 31.027136] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6e651d8 [ 31.034395] R13: 0000000000000000 R14: ffff8801d6e65180 R15: ffff8801d563fc78 [ 31.041643] FS: 00007f0e8e8fc700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.049845] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.055843] CR2: 0000000000000080 CR3: 00000001d6f85000 CR4: 00000000001606f0 [ 31.063137] Stack: [ 31.065269] 0000000000000201 ffffffff836ca141 ffff8801d563fae0 ffffffff81237f0d [ 31.073257] ffff8801d6e65180 ffff8801d6e65058 ffff8801d6e651d8 ffff8801d6e65050 [ 31.081252] ffff8801d6e64fb0 ffff8801d6e651a0 0000000000000000 0000000000000000 [ 31.089378] Call Trace: [ 31.091941] [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790 [ 31.098061] [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10 [ 31.104010] [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0 [ 31.110138] [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30 [ 31.116343] [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.122895] [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170 [ 31.129807] [<ffffffff83a02629>] ? retint_kernel+0x2d/0x2d [ 31.135496] [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0 [ 31.142055] [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300 [ 31.147659] [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280 [ 31.153304] [<ffffffff812db710>] ? do_futex+0x17c0/0x17c0 [ 31.159002] [<ffffffff815dc2cd>] ? fd_install+0x4d/0x60 [ 31.164436] [<ffffffff83021224>] SyS_connect+0x24/0x30 [ 31.169794] [<ffffffff83021200>] ? SyS_accept+0x30/0x30 [ 31.175220] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 31.180921] [<ffffffff83a01c93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.187966] Code: 00 00 49 8d be 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 31.215037] RIP [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 31.221798] RSP <ffff8801d563fac0> [ 31.225411] CR2: 0000000000000080 [ 31.229276] ---[ end trace bfcc61ca247e5bdc ]--- [ 31.234159] Kernel panic - not syncing: Fatal exception [ 31.239776] Dumping ftrace buffer: [ 31.243288] (ftrace buffer empty) [ 31.246972] Kernel Offset: disabled [ 31.250667] Rebooting in 86400 seconds..