[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.170638] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.316036] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.720350] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.312276] random: sshd: uninitialized urandom read (32 bytes read, 51 bits of entropy available) [ 25.483442] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 31.078594] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) 2018/08/23 04:06:19 parsed 1 programs [ 32.358263] random: cc1: uninitialized urandom read (8 bytes read, 59 bits of entropy available) 2018/08/23 04:06:21 executed programs: 0 [ 33.716134] IPVS: Creating netns size=2552 id=1 [ 33.957889] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 33.972442] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 34.054108] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 34.069348] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 34.150280] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 34.165507] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 34.181884] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 34.198781] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 34.919667] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.958516] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 35.237654] hrtimer: interrupt took 13189 ns [ 35.371084] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:26 executed programs: 177 [ 42.965308] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:31 executed programs: 387 [ 44.178098] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 47.265504] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 48.575318] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:36 executed programs: 598 [ 51.012271] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:41 executed programs: 809 [ 55.376231] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 56.872328] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:47 executed programs: 1025 [ 60.845471] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 61.194879] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 04:06:52 executed programs: 1236 [ 65.855371] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 65.863609] IP: [] l2tp_session_create+0x948/0x1030 [ 65.870307] PGD 1d3580067 PUD 1d4558067 PMD 0 [ 65.875225] Oops: 0002 [#1] PREEMPT SMP KASAN [ 65.880187] Dumping ftrace buffer: [ 65.883700] (ftrace buffer empty) [ 65.887391] Modules linked in: [ 65.890712] CPU: 0 PID: 9532 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #21 [ 65.898307] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.907643] task: ffff8801d23d1800 task.stack: ffff8801d6ce8000 [ 65.913670] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 65.922781] RSP: 0018:ffff8801d6cefad0 EFLAGS: 00010246 [ 65.928205] RAX: 0000000000000000 RBX: ffff8800b4666280 RCX: 0000000000000006 [ 65.935449] RDX: 1ffff100168ccc80 RSI: ffffffff835a4543 RDI: ffff8800b4666400 [ 65.942692] RBP: ffff8801d6cefb40 R08: ffff8801d23d2100 R09: 0000000000000000 [ 65.949955] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b91434a8 [ 65.957202] R13: ffff8801d6cefc58 R14: ffff8800b9143400 R15: ffffffff835a3170 [ 65.964446] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f773cb40 [ 65.972646] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 65.978501] CR2: 0000000000000080 CR3: 00000001da305000 CR4: 00000000001606f0 [ 65.985751] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 65.992995] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.000236] Stack: [ 66.002358] ffffffff81140a6a ffff8800b46662a0 ffff8800b9143558 ffff8800b9143410 [ 66.010356] ffffffff838cba90 ffff8800b91434b0 ffff8800b9143550 ffff8800b4666360 [ 66.018361] ffffffff00000000 ffff8801cfdb7700 0000000000000000 ffff8801cfdb7730 [ 66.026364] Call Trace: [ 66.028928] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 66.035227] [] ? _raw_read_unlock_bh+0x30/0x40 [ 66.041443] [] pppol2tp_connect+0x10f0/0x1910 [ 66.047562] [] ? pppol2tp_recv+0x320/0x320 [ 66.053427] [] ? security_socket_connect+0x8f/0xc0 [ 66.059982] [] SYSC_connect+0x1b8/0x300 [ 66.065580] [] ? SYSC_bind+0x280/0x280 [ 66.071091] [] ? get_unused_fd_flags+0xd0/0xd0 [ 66.077305] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 66.084302] [] ? SyS_socket+0x121/0x1b0 [ 66.089914] [] ? move_addr_to_kernel+0x50/0x50 [ 66.096124] [] SyS_connect+0x24/0x30 [ 66.101462] [] ? SyS_accept+0x30/0x30 [ 66.106892] [] do_fast_syscall_32+0x324/0x8b0 [ 66.113018] [] sysenter_flags_fixed+0xd/0x1a [ 66.119047] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 66.145979] RIP [] l2tp_session_create+0x948/0x1030 [ 66.152746] RSP [ 66.156346] CR2: 0000000000000080 [ 66.161888] ---[ end trace 1c3748dc8e7508e8 ]--- [ 66.166662] Kernel panic - not syncing: Fatal exception [ 66.172337] Dumping ftrace buffer: [ 66.175857] (ftrace buffer empty) [ 66.179543] Kernel Offset: disabled [ 66.183140] Rebooting in 86400 seconds..