[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.607587] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.978746] random: sshd: uninitialized urandom read (32 bytes read) [ 26.422188] random: sshd: uninitialized urandom read (32 bytes read) [ 26.983097] random: sshd: uninitialized urandom read (32 bytes read) [ 27.127068] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. [ 32.831093] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 03:26:31 parsed 1 programs [ 33.879960] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 03:26:32 executed programs: 0 [ 34.945653] IPVS: Creating netns size=2536 id=1 [ 35.069616] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.081545] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.125140] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.136238] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.179200] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.190722] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.202105] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 35.222940] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 35.723282] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 35.748084] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 35.754275] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 35.760987] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 35.978213] hrtimer: interrupt took 28131 ns [ 36.000515] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 36.008737] IP: [] l2tp_session_create+0xc60/0x16f0 [ 36.015488] PGD 1da114067 [ 36.018144] PUD 1d6ee6067 PMD 0 [ 36.021627] [ 36.023251] Oops: 0002 [#1] PREEMPT SMP KASAN [ 36.027718] Dumping ftrace buffer: [ 36.031231] (ftrace buffer empty) [ 36.034914] Modules linked in: [ 36.038205] CPU: 1 PID: 4206 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 36.045856] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.055193] task: ffff8801d5240000 task.stack: ffff8801d5378000 [ 36.061228] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 36.070342] RSP: 0018:ffff8801d537fac0 EFLAGS: 00010246 [ 36.075762] RAX: 0000000000000000 RBX: ffff8801d6f4cf00 RCX: 1ffff1003aa4811d [ 36.083005] RDX: 1ffff1003ade9ab0 RSI: ffff8801d52408c8 RDI: ffff8801d6f4d580 [ 36.090251] RBP: ffff8801d537fb60 R08: ffff8801d52408e8 R09: 0000000000000000 [ 36.097606] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6f4d458 [ 36.104852] R13: 0000000000000000 R14: ffff8801d6f4d400 R15: ffff8801d537fc78 [ 36.112097] FS: 00007fc4b311f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.120297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.126154] CR2: 0000000000000080 CR3: 00000001b9108000 CR4: 00000000001606f0 [ 36.133401] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.140643] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.147889] Stack: [ 36.150016] 0000000000000201 ffffffff836ca141 ffff8801d537fae0 ffffffff81237f0d [ 36.158051] ffff8801d6f4d400 ffff8801d6f4d058 ffff8801d6f4d458 ffff8801d6f4d050 [ 36.166042] ffff8801d6f4cfb0 ffff8801d6f4d420 0000000000000000 0000000000000000 [ 36.174103] Call Trace: [ 36.176674] [] ? l2tp_session_get+0x1d1/0x790 [ 36.182793] [] ? trace_hardirqs_on+0xd/0x10 [ 36.188741] [] pppol2tp_connect+0x10d7/0x18f0 [ 36.194860] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 36.201067] [] ? security_socket_connect+0x8f/0xc0 [ 36.207635] [] SYSC_connect+0x1b8/0x300 [ 36.213237] [] ? SYSC_bind+0x280/0x280 [ 36.218751] [] ? retint_kernel+0x2d/0x2d [ 36.224438] [] ? do_futex+0x17c0/0x17c0 [ 36.230036] [] ? retint_kernel+0x2d/0x2d [ 36.235723] [] SyS_connect+0x24/0x30 [ 36.241060] [] ? SyS_accept+0x30/0x30 [ 36.246488] [] do_syscall_64+0x1a6/0x490 [ 36.252171] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.259069] 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 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 36.285998] RIP [] l2tp_session_create+0xc60/0x16f0 [ 36.292903] RSP [ 36.296573] CR2: 0000000000000080 [ 36.301847] ---[ end trace c640c99d6aa779f4 ]--- [ 36.306738] Kernel panic - not syncing: Fatal exception [ 36.312445] Dumping ftrace buffer: [ 36.315967] (ftrace buffer empty) [ 36.319659] Kernel Offset: disabled [ 36.323265] Rebooting in 86400 seconds..