[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.222550] 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: [ 26.426400] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.785744] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.504442] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 35.801008] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 41.570679] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) 2018/08/24 22:31:38 parsed 1 programs [ 42.610608] random: cc1: uninitialized urandom read (8 bytes read, 81 bits of entropy available) 2018/08/24 22:31:39 executed programs: 0 [ 43.613735] IPVS: Creating netns size=2552 id=1 [ 43.852907] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 43.867399] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 43.947868] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 43.962763] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 44.043663] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 44.058449] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 44.075440] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 44.093754] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 44.811744] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.849156] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 45.589335] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 45.597561] IP: [] l2tp_session_create+0x948/0x1030 [ 45.604243] PGD 1d8317067 PUD 1da140067 PMD 0 [ 45.609265] Oops: 0002 [#1] PREEMPT SMP KASAN [ 45.614216] Dumping ftrace buffer: [ 45.617729] (ftrace buffer empty) [ 45.621463] Modules linked in: [ 45.624766] CPU: 1 PID: 4406 Comm: syz-executor0 Not tainted 4.4.152-ge15716b #88 [ 45.632361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.641696] task: ffff8800b7a23000 task.stack: ffff8801d4ec8000 [ 45.647722] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 45.656832] RSP: 0018:ffff8801d4ecfb48 EFLAGS: 00010246 [ 45.662309] RAX: 0000000000000000 RBX: ffff8800b94d2a00 RCX: 0000000000000006 [ 45.669560] RDX: 1ffff1001729a570 RSI: ffffffff835a4993 RDI: ffff8800b94d2b80 [ 45.676844] RBP: ffff8801d4ecfbb8 R08: 000000000000000a R09: 000000000000ffff [ 45.684104] R10: ffffed001729a4b8 R11: ffffffff8463a140 R12: ffff8800b94d25a8 [ 45.691352] R13: ffff8801d4ecfcd0 R14: ffff8800b94d2500 R15: ffffffff835a35c0 [ 45.698606] FS: 00007fb14c451700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 45.706807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.712711] CR2: 0000000000000080 CR3: 00000001d93b4000 CR4: 00000000001606f0 [ 45.719966] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.727212] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.734457] Stack: [ 45.736589] ffffffff81140a6a ffff8800b94d2a20 ffff8800b94d2658 ffff8800b94d2510 [ 45.744701] ffffffff838cbee0 ffff8800b94d25b0 ffff8800b94d2650 ffff8800b94d2ae0 [ 45.752687] ffffffff00000000 ffff8800b9876600 0000000000000000 ffff8800b9876630 [ 45.760665] Call Trace: [ 45.763237] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 45.769541] [] ? _raw_read_unlock_bh+0x30/0x40 [ 45.775836] [] pppol2tp_connect+0x10f0/0x1910 [ 45.781980] [] ? pppol2tp_recv+0x320/0x320 [ 45.787847] [] ? security_socket_connect+0x8f/0xc0 [ 45.794488] [] SYSC_connect+0x1b8/0x300 [ 45.800108] [] ? SYSC_bind+0x280/0x280 [ 45.805632] [] ? get_unused_fd_flags+0xd0/0xd0 [ 45.811842] [] ? do_futex+0x17f0/0x17f0 [ 45.817441] [] ? SyS_socket+0x121/0x1b0 [ 45.823041] [] ? move_addr_to_kernel+0x50/0x50 [ 45.829257] [] SyS_connect+0x24/0x30 [ 45.834599] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.841153] 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 [ 45.867986] RIP [] l2tp_session_create+0x948/0x1030 [ 45.874751] RSP [ 45.878350] CR2: 0000000000000080 [ 45.885461] ---[ end trace 91be33404b71a57c ]--- [ 45.890241] Kernel panic - not syncing: Fatal exception [ 45.895945] Dumping ftrace buffer: [ 45.899464] (ftrace buffer empty) [ 45.903148] Kernel Offset: disabled [ 45.906759] Rebooting in 86400 seconds..