[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.831269] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.113076] random: sshd: uninitialized urandom read (32 bytes read) [ 25.630329] random: sshd: uninitialized urandom read (32 bytes read) [ 26.111477] random: sshd: uninitialized urandom read (32 bytes read) [ 32.616208] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.195' (ECDSA) to the list of known hosts. [ 38.275847] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/25 08:33:32 parsed 1 programs [ 39.654591] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/25 08:33:35 executed programs: 0 [ 40.999506] IPVS: Creating netns size=2536 id=1 [ 41.121081] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 41.132189] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 41.173735] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 41.185622] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 41.228083] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 41.239585] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 41.250866] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 41.264121] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 41.745933] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 41.771127] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 41.777363] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 41.784058] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 41.989028] hrtimer: interrupt took 19916 ns [ 42.027081] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 42.148593] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 42.164312] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 42.172552] IP: [] l2tp_session_create+0xc60/0x16f0 [ 42.179282] PGD 1da0b3067 [ 42.181930] PUD 1da130067 PMD 0 [ 42.185537] [ 42.187159] Oops: 0002 [#1] PREEMPT SMP KASAN [ 42.191630] Dumping ftrace buffer: [ 42.195216] (ftrace buffer empty) [ 42.198911] Modules linked in: [ 42.202203] CPU: 0 PID: 4259 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #35 [ 42.209794] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.219203] task: ffff8801d731b000 task.stack: ffff8801d77f8000 [ 42.225243] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 42.234367] RSP: 0018:ffff8801d77ffab0 EFLAGS: 00010246 [ 42.239789] RAX: 0000000000000000 RBX: ffff8801d8b2ac80 RCX: 1ffff1003ae6371d [ 42.247152] RDX: 1ffff1003b165660 RSI: ffff8801d731b8c8 RDI: ffff8801d8b2b300 [ 42.254399] RBP: ffff8801d77ffb50 R08: ffff8801d731b8e8 R09: 0000000000000000 [ 42.261749] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8b2b1d8 [ 42.269005] R13: 0000000000000000 R14: ffff8801d8b2b180 R15: ffff8801d77ffc68 [ 42.276255] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7710b40 [ 42.284456] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 42.290313] CR2: 0000000000000080 CR3: 00000001d82a0000 CR4: 00000000001606f0 [ 42.297564] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.304818] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.312065] Stack: [ 42.314237] 0000000000000201 ffffffff836c9ec1 ffff8801d77ffad0 ffffffff812383ad [ 42.322324] ffff8801d8b2b180 ffff8801d8b2add8 ffff8801d8b2b1d8 ffff8801d8b2add0 [ 42.330376] ffff8801d8b2ad30 ffff8801d8b2b1a0 0000000000000000 0000000000000000 [ 42.338389] Call Trace: [ 42.340956] [] ? l2tp_session_get+0x1d1/0x790 [ 42.347079] [] ? trace_hardirqs_on+0xd/0x10 [ 42.353135] [] pppol2tp_connect+0x10d7/0x18f0 [ 42.359276] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 42.365518] [] ? security_socket_connect+0x8f/0xc0 [ 42.372077] [] SYSC_connect+0x1b8/0x300 [ 42.377689] [] ? SYSC_bind+0x280/0x280 [ 42.383209] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 42.390223] [] ? __schedule+0x655/0x1bd0 [ 42.395910] [] ? move_addr_to_kernel+0x50/0x50 [ 42.402119] [] SyS_connect+0x24/0x30 [ 42.407460] [] ? SyS_accept+0x30/0x30 [ 42.412888] [] do_fast_syscall_32+0x2f7/0x870 [ 42.419011] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.425671] [] entry_SYSENTER_compat+0x90/0xa2 [ 42.431875] 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 [ 42.458890] RIP [] l2tp_session_create+0xc60/0x16f0 [ 42.465652] RSP [ 42.469251] CR2: 0000000000000080 [ 42.473602] ---[ end trace ae59c3ce020dc3f4 ]--- [ 42.478600] Kernel panic - not syncing: Fatal exception [ 42.484305] Dumping ftrace buffer: [ 42.487827] (ftrace buffer empty) [ 42.491516] Kernel Offset: disabled [ 42.495115] Rebooting in 86400 seconds..