[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.390744] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.693514] random: sshd: uninitialized urandom read (32 bytes read) [ 17.014072] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.892164] random: sshd: uninitialized urandom read (32 bytes read) [ 18.039948] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 23.565229] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/29 09:42:27 parsed 1 programs [ 24.425047] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/29 09:42:28 executed programs: 0 [ 25.668770] IPVS: Creating netns size=2536 id=1 [ 25.794879] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 25.806260] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 25.849833] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 25.861350] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 25.905908] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 25.917046] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 25.929225] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 25.950085] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 25.996748] ip (3910) used greatest stack depth: 23976 bytes left [ 26.469874] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 26.494616] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 26.500921] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 26.508774] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.732380] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 26.774362] hrtimer: interrupt took 27903 ns [ 26.819740] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 26.876926] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 27.511450] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 27.536349] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 27.642720] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 27.920865] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.000284] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.091757] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.209811] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.352072] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.509252] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.648855] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.959949] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.016413] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 29.024680] IP: [] l2tp_session_create+0xc60/0x16f0 [ 29.031366] PGD 1b9881067 [ 29.034010] PUD 1be734067 PMD 0 [ 29.037495] [ 29.039115] Oops: 0002 [#1] PREEMPT SMP KASAN [ 29.043600] Dumping ftrace buffer: [ 29.047113] (ftrace buffer empty) [ 29.050797] Modules linked in: [ 29.054081] CPU: 0 PID: 5083 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #31 [ 29.061672] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.071002] task: ffff8801b9971800 task.stack: ffff8801b9b80000 [ 29.077034] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 29.086175] RSP: 0018:ffff8801b9b87ac0 EFLAGS: 00010246 [ 29.091608] RAX: 0000000000000000 RBX: ffff8801cb374a00 RCX: 1ffff1003732e41d [ 29.098857] RDX: 1ffff1003966e8d0 RSI: ffff8801b99720c8 RDI: ffff8801cb374680 [ 29.106120] RBP: ffff8801b9b87b60 R08: ffff8801b99720e8 R09: 0000000000000000 [ 29.113383] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cb374558 [ 29.120634] R13: 0000000000000000 R14: ffff8801cb374500 R15: ffff8801b9b87c78 [ 29.127884] FS: 00007f7725242700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.136098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.141957] CR2: 0000000000000080 CR3: 00000001b9b40000 CR4: 00000000001606f0 [ 29.149204] Stack: [ 29.151329] 0000000000000201 ffffffff836c9ec1 ffff8801b9b87ae0 ffffffff812383ad [ 29.159335] ffff8801cb374500 ffff8801cb374b58 ffff8801cb374558 ffff8801cb374b50 [ 29.167355] ffff8801cb374ab0 ffff8801cb374520 0000000000000000 0000000000000000 [ 29.175373] Call Trace: [ 29.177958] [] ? l2tp_session_get+0x1d1/0x790 [ 29.184108] [] ? trace_hardirqs_on+0xd/0x10 [ 29.190058] [] pppol2tp_connect+0x10d7/0x18f0 [ 29.196191] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 29.202419] [] ? security_socket_connect+0x8f/0xc0 [ 29.208976] [] SYSC_connect+0x1b8/0x300 [ 29.214577] [] ? SYSC_bind+0x280/0x280 [ 29.220093] [] ? do_futex+0x17c0/0x17c0 [ 29.225691] [] ? move_addr_to_kernel+0x50/0x50 [ 29.231899] [] SyS_connect+0x24/0x30 [ 29.237256] [] ? SyS_accept+0x30/0x30 [ 29.242687] [] do_syscall_64+0x1a6/0x490 [ 29.248376] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.255276] 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 [ 29.282380] RIP [] l2tp_session_create+0xc60/0x16f0 [ 29.289148] RSP [ 29.292748] CR2: 0000000000000080 [ 29.296330] ---[ end trace 97dcc918b22d1502 ]--- [ 29.301385] Kernel panic - not syncing: Fatal exception [ 29.307022] Dumping ftrace buffer: [ 29.310545] (ftrace buffer empty) [ 29.314229] Kernel Offset: disabled [ 29.317829] Rebooting in 86400 seconds..