[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.284976] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.583852] random: sshd: uninitialized urandom read (32 bytes read) [ 20.922617] random: sshd: uninitialized urandom read (32 bytes read) [ 21.415681] random: sshd: uninitialized urandom read (32 bytes read) [ 34.776863] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. [ 40.320569] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 05:58:25 parsed 1 programs [ 41.709535] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 05:58:26 executed programs: 0 [ 42.490238] IPVS: Creating netns size=2536 id=1 [ 42.614337] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 42.625813] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 42.668611] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 42.681033] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 42.725746] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 42.737280] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 42.748936] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 42.762924] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 43.271889] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 43.296402] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 43.302764] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 43.310146] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 43.540848] hrtimer: interrupt took 21840 ns [ 43.614372] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.709196] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.807709] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.880979] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 43.970503] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 43.978840] IP: [] l2tp_session_create+0xc60/0x16f0 [ 43.985530] PGD 1d49a0067 [ 43.988176] PUD 1d325c067 PMD 0 [ 43.991655] [ 43.993279] Oops: 0002 [#1] PREEMPT SMP KASAN [ 43.997755] Dumping ftrace buffer: [ 44.001270] (ftrace buffer empty) [ 44.004956] Modules linked in: [ 44.008248] CPU: 0 PID: 4438 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #30 [ 44.015882] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.025220] task: ffff8801d3e36000 task.stack: ffff8801d7c60000 [ 44.031250] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 44.040378] RSP: 0018:ffff8801d7c67ab0 EFLAGS: 00010246 [ 44.045803] RAX: 0000000000000000 RBX: ffff8801d06c0500 RCX: 1ffff1003a7c6d1d [ 44.053052] RDX: 1ffff1003a116750 RSI: ffff8801d3e368c8 RDI: ffff8801d08b3a80 [ 44.060300] RBP: ffff8801d7c67b50 R08: ffff8801d3e368e8 R09: 0000000000000000 [ 44.067546] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d08b3958 [ 44.074805] R13: 0000000000000000 R14: ffff8801d08b3900 R15: ffff8801d7c67c68 [ 44.082054] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7786b40 [ 44.090367] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 44.096278] CR2: 0000000000000080 CR3: 00000001d07e9000 CR4: 00000000001606f0 [ 44.103634] Stack: [ 44.105759] 0000000000000201 ffffffff836c9151 ffff8801d7c67ad0 ffffffff81237ecd [ 44.113843] ffff8801d08b3900 ffff8801d06c0658 ffff8801d08b3958 ffff8801d06c0650 [ 44.121840] ffff8801d06c05b0 ffff8801d08b3920 0000000000000000 0000000000000000 [ 44.129916] Call Trace: [ 44.132483] [] ? l2tp_session_get+0x1d1/0x790 [ 44.138611] [] ? trace_hardirqs_on+0xd/0x10 [ 44.144575] [] pppol2tp_connect+0x10d7/0x18f0 [ 44.150700] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 44.156909] [] ? security_socket_connect+0x8f/0xc0 [ 44.163473] [] SYSC_connect+0x1b8/0x300 [ 44.169072] [] ? SYSC_bind+0x280/0x280 [ 44.174583] [] ? get_unused_fd_flags+0xd0/0xd0 [ 44.180878] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 44.187876] [] ? SyS_socket+0x121/0x1b0 [ 44.193475] [] ? move_addr_to_kernel+0x50/0x50 [ 44.199697] [] SyS_connect+0x24/0x30 [ 44.205038] [] ? SyS_accept+0x30/0x30 [ 44.210467] [] do_fast_syscall_32+0x2f7/0x870 [ 44.216587] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.223235] [] entry_SYSENTER_compat+0x90/0xa2 [ 44.229438] 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 [ 44.256448] RIP [] l2tp_session_create+0xc60/0x16f0 [ 44.263219] RSP [ 44.266822] CR2: 0000000000000080 [ 44.271016] ---[ end trace 3bf479d6420f656c ]--- [ 44.275755] Kernel panic - not syncing: Fatal exception [ 44.281351] Dumping ftrace buffer: [ 44.284871] (ftrace buffer empty) [ 44.288560] Kernel Offset: disabled [ 44.292163] Rebooting in 86400 seconds..