[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.485492] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.273535] random: sshd: uninitialized urandom read (32 bytes read) [ 23.639187] random: sshd: uninitialized urandom read (32 bytes read) [ 24.152601] random: sshd: uninitialized urandom read (32 bytes read) [ 24.281546] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 29.894195] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 23:30:50 parsed 1 programs [ 31.183201] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 23:30:52 executed programs: 0 [ 32.600071] IPVS: Creating netns size=2536 id=1 [ 32.728918] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.740943] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.784720] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 32.795929] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 32.841008] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 32.852489] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 32.864612] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.884964] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 33.403460] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.428925] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 33.435041] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 33.442485] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.923878] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 33.932465] IP: [] l2tp_session_create+0xc60/0x16f0 [ 33.939168] PGD 1d4294067 [ 33.941812] PUD 1d3c3c067 PMD 0 [ 33.945337] [ 33.947050] Oops: 0002 [#1] PREEMPT SMP KASAN [ 33.951525] Dumping ftrace buffer: [ 33.955037] (ftrace buffer empty) [ 33.958830] Modules linked in: [ 33.962113] CPU: 1 PID: 4375 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 33.969709] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.979038] task: ffff8801d3c99800 task.stack: ffff8801d3e60000 [ 33.985067] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 33.994486] RSP: 0018:ffff8801d3e67ac0 EFLAGS: 00010246 [ 33.999976] RAX: 0000000000000000 RBX: ffff8801d45eb180 RCX: 1ffff1003a79341d [ 34.007555] RDX: 1ffff1003a7f4700 RSI: ffff8801d3c9a0c8 RDI: ffff8801d3fa3800 [ 34.014937] RBP: ffff8801d3e67b60 R08: ffff8801d3c9a0e8 R09: 0000000000000000 [ 34.022281] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3fa36d8 [ 34.029531] R13: 0000000000000000 R14: ffff8801d3fa3680 R15: ffff8801d3e67c78 [ 34.036794] FS: 00007f8c8c1f3700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.045155] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.051011] CR2: 0000000000000080 CR3: 00000001d414f000 CR4: 00000000001606f0 [ 34.058297] Stack: [ 34.060431] 0000000000000201 ffffffff836ca141 ffff8801d3e67ae0 ffffffff81237f0d [ 34.068625] ffff8801d3fa3680 ffff8801d45eb2d8 ffff8801d3fa36d8 ffff8801d45eb2d0 [ 34.076750] ffff8801d45eb230 ffff8801d3fa36a0 0000000000000000 0000000000000000 [ 34.084768] Call Trace: [ 34.087336] [] ? l2tp_session_get+0x1d1/0x790 [ 34.093462] [] ? trace_hardirqs_on+0xd/0x10 [ 34.099414] [] pppol2tp_connect+0x10d7/0x18f0 [ 34.105542] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 34.111831] [] ? security_socket_connect+0x8f/0xc0 [ 34.118394] [] SYSC_connect+0x1b8/0x300 [ 34.123997] [] ? debug_check_no_locks_freed+0x210/0x210 [ 34.130982] [] ? SYSC_bind+0x280/0x280 [ 34.136494] [] ? get_unused_fd_flags+0xd0/0xd0 [ 34.142703] [] ? do_futex+0x17c0/0x17c0 [ 34.148306] [] ? SyS_dup2+0x41f/0x5e0 [ 34.153732] [] SyS_connect+0x24/0x30 [ 34.159068] [] ? SyS_accept+0x30/0x30 [ 34.164489] [] do_syscall_64+0x1a6/0x490 [ 34.170178] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.177085] 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 [ 34.204165] RIP [] l2tp_session_create+0xc60/0x16f0 [ 34.211072] RSP [ 34.214670] CR2: 0000000000000080 [ 34.218868] ---[ end trace f806185f20dca569 ]--- [ 34.223825] Kernel panic - not syncing: Fatal exception [ 34.229468] Dumping ftrace buffer: [ 34.232980] (ftrace buffer empty) [ 34.236663] Kernel Offset: disabled [ 34.240266] Rebooting in 86400 seconds..