[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.670108] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.354354] random: sshd: uninitialized urandom read (32 bytes read) [ 14.789175] random: sshd: uninitialized urandom read (32 bytes read) [ 15.320162] random: sshd: uninitialized urandom read (32 bytes read) [ 39.352312] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 44.918081] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 22:10:24 parsed 1 programs [ 46.029953] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 22:10:25 executed programs: 0 [ 47.122597] IPVS: Creating netns size=2536 id=1 [ 47.246844] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 47.259419] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 47.302734] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 47.314558] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 47.358903] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 47.370222] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 47.382088] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 47.403142] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 47.920951] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 47.946205] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 47.952339] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 47.959671] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 48.329025] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 48.337252] IP: [] l2tp_session_create+0xc60/0x16f0 [ 48.344016] PGD 1d4928067 [ 48.346663] PUD 1da222067 PMD 0 [ 48.350151] [ 48.351804] Oops: 0002 [#1] PREEMPT SMP KASAN [ 48.356275] Dumping ftrace buffer: [ 48.359789] (ftrace buffer empty) [ 48.363481] Modules linked in: [ 48.366777] CPU: 1 PID: 4336 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 48.374632] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.383958] task: ffff8801d47e9800 task.stack: ffff8801c0ab0000 [ 48.390000] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 48.399119] RSP: 0018:ffff8801c0ab7ac0 EFLAGS: 00010246 [ 48.404558] RAX: 0000000000000000 RBX: ffff8801d4436280 RCX: 1ffff1003a8fd41d [ 48.411850] RDX: 1ffff1003a886e10 RSI: ffff8801d47ea0c8 RDI: ffff8801d4437080 [ 48.419102] RBP: ffff8801c0ab7b60 R08: ffff8801d47ea0e8 R09: 0000000000000000 [ 48.426361] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4436f58 [ 48.433728] R13: 0000000000000000 R14: ffff8801d4436f00 R15: ffff8801c0ab7c78 [ 48.441208] FS: 00007f5bb4b32700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 48.449420] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.455287] CR2: 0000000000000080 CR3: 00000001d4767000 CR4: 00000000001606f0 [ 48.462542] Stack: [ 48.464672] 0000000000000201 ffffffff836ca141 ffff8801c0ab7ae0 ffffffff81237f0d [ 48.472669] ffff8801d4436f00 ffff8801d44363d8 ffff8801d4436f58 ffff8801d44363d0 [ 48.480741] ffff8801d4436330 ffff8801d4436f20 0000000000000000 0000000000000000 [ 48.488735] Call Trace: [ 48.491307] [] ? l2tp_session_get+0x1d1/0x790 [ 48.497507] [] ? trace_hardirqs_on+0xd/0x10 [ 48.503475] [] pppol2tp_connect+0x10d7/0x18f0 [ 48.509610] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 48.515837] [] ? security_socket_connect+0x8f/0xc0 [ 48.522411] [] SYSC_connect+0x1b8/0x300 [ 48.528026] [] ? debug_check_no_locks_freed+0x210/0x210 [ 48.535031] [] ? SYSC_bind+0x280/0x280 [ 48.540555] [] ? get_unused_fd_flags+0xd0/0xd0 [ 48.546769] [] ? do_futex+0x17c0/0x17c0 [ 48.552476] [] ? SyS_dup2+0x41f/0x5e0 [ 48.558026] [] SyS_connect+0x24/0x30 [ 48.563371] [] ? SyS_accept+0x30/0x30 [ 48.568818] [] do_syscall_64+0x1a6/0x490 [ 48.574515] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 48.581419] 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 [ 48.608657] RIP [] l2tp_session_create+0xc60/0x16f0 [ 48.615427] RSP [ 48.619085] CR2: 0000000000000080 [ 48.623619] ---[ end trace ad73746b1abe026c ]--- [ 48.628404] Kernel panic - not syncing: Fatal exception [ 48.634099] Dumping ftrace buffer: [ 48.637622] (ftrace buffer empty) [ 48.641312] Kernel Offset: disabled [ 48.644914] Rebooting in 86400 seconds..