[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.770161] 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: [ 24.646075] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.911107] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.655627] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 44.842153] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 50.438751] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) 2018/08/25 08:17:33 parsed 1 programs [ 51.543677] random: cc1: uninitialized urandom read (8 bytes read, 85 bits of entropy available) 2018/08/25 08:17:35 executed programs: 0 [ 52.731127] IPVS: Creating netns size=2552 id=1 [ 52.972005] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 52.986400] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 53.069409] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 53.085651] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 53.166538] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 53.181559] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 53.197090] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 53.213130] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 53.255344] ip (3865) used greatest stack depth: 23584 bytes left [ 53.957813] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 53.996209] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 55.149309] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 56.750939] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 2018/08/25 08:17:40 executed programs: 296 [ 58.997100] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 61.809342] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 61.817608] IP: [] l2tp_session_create+0x948/0x1030 [ 61.824283] PGD 1d82e0067 PUD 1d2341067 PMD 0 [ 61.829220] Oops: 0002 [#1] PREEMPT SMP KASAN [ 61.834157] Dumping ftrace buffer: [ 61.837683] (ftrace buffer empty) [ 61.841366] Modules linked in: [ 61.844652] CPU: 1 PID: 6404 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #89 [ 61.852241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.861567] task: ffff8800b74ac800 task.stack: ffff8801d36f0000 [ 61.867595] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 61.876704] RSP: 0018:ffff8801d36f7b48 EFLAGS: 00010246 [ 61.882124] RAX: 0000000000000000 RBX: ffff8801d8319180 RCX: 0000000000000006 [ 61.889366] RDX: 1ffff1003b063260 RSI: ffffffff835a4993 RDI: ffff8801d8319300 [ 61.896612] RBP: ffff8801d36f7bb8 R08: 000000000000000a R09: 000000000000ffff [ 61.903854] R10: ffffed003b0631a8 R11: ffffffff8463a140 R12: ffff8801d8318d28 [ 61.911100] R13: ffff8801d36f7cd0 R14: ffff8801d8318c80 R15: ffffffff835a35c0 [ 61.918356] FS: 00007f299f180700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 61.928394] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.934249] CR2: 0000000000000080 CR3: 00000001d8689000 CR4: 00000000001606f0 [ 61.941495] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.948741] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.955997] Stack: [ 61.958119] ffffffff81140a6a ffff8801d83191a0 ffff8801d8318dd8 ffff8801d8318c90 [ 61.966094] ffffffff838cbee0 ffff8801d8318d30 ffff8801d8318dd0 ffff8801d8319260 [ 61.974076] ffffffff00000000 ffff8801d64f0880 0000000000000000 ffff8801d64f08b0 [ 61.982057] Call Trace: [ 61.984621] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 61.990916] [] ? _raw_read_unlock_bh+0x30/0x40 [ 61.997120] [] pppol2tp_connect+0x10f0/0x1910 [ 62.003240] [] ? pppol2tp_recv+0x320/0x320 [ 62.009100] [] ? security_socket_connect+0x8f/0xc0 [ 62.015651] [] SYSC_connect+0x1b8/0x300 [ 62.021299] [] ? SYSC_bind+0x280/0x280 [ 62.026808] [] ? get_unused_fd_flags+0xd0/0xd0 [ 62.033029] [] ? do_futex+0x17f0/0x17f0 [ 62.038632] [] ? SyS_socket+0x121/0x1b0 [ 62.044232] [] ? move_addr_to_kernel+0x50/0x50 [ 62.050439] [] SyS_connect+0x24/0x30 [ 62.055799] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 62.062345] 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 [ 62.089034] RIP [] l2tp_session_create+0x948/0x1030 [ 62.095797] RSP [ 62.099390] CR2: 0000000000000080 [ 62.103469] ---[ end trace 8e40edc749dbced7 ]--- [ 62.108253] Kernel panic - not syncing: Fatal exception [ 62.114152] Dumping ftrace buffer: [ 62.117672] (ftrace buffer empty) [ 62.121353] Kernel Offset: disabled [ 62.124951] Rebooting in 86400 seconds..