[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.354661] 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: [ 20.814546] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.049316] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.757086] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 21.931049] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 27.528451] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) 2018/08/22 16:23:38 parsed 1 programs [ 28.713335] random: cc1: uninitialized urandom read (8 bytes read, 79 bits of entropy available) 2018/08/22 16:23:40 executed programs: 0 [ 30.195569] IPVS: Creating netns size=2552 id=1 [ 30.440485] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.457808] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.539596] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.554922] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.635671] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.650619] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.666641] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.684221] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 31.427152] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.467266] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.750562] hrtimer: interrupt took 24933 ns [ 32.305558] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 32.313822] IP: [] l2tp_session_create+0x948/0x1030 [ 32.320497] PGD 1d8377067 PUD 1d8977067 PMD 0 [ 32.325458] Oops: 0002 [#1] PREEMPT SMP KASAN [ 32.330423] Dumping ftrace buffer: [ 32.333941] (ftrace buffer empty) [ 32.337634] Modules linked in: [ 32.340945] CPU: 0 PID: 4166 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 32.348538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.357912] task: ffff8801d8711800 task.stack: ffff8801d8280000 [ 32.363943] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 32.373057] RSP: 0018:ffff8801d8287b48 EFLAGS: 00010246 [ 32.378482] RAX: 0000000000000000 RBX: ffff8800baa5ec80 RCX: 0000000000000006 [ 32.385727] RDX: 1ffff1001754bdc0 RSI: ffffffff835a4543 RDI: ffff8800baa5ee00 [ 32.392978] RBP: ffff8801d8287bb8 R08: ffff8801d8712100 R09: 0000000000000000 [ 32.400227] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d8344328 [ 32.407472] R13: ffff8801d8287cd0 R14: ffff8801d8344280 R15: ffffffff835a3170 [ 32.414720] FS: 00007fdd570a1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.422938] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.428795] CR2: 0000000000000080 CR3: 00000001d8133000 CR4: 00000000001606f0 [ 32.436040] Stack: [ 32.438163] ffffffff81140a6a ffff8800baa5eca0 ffff8801d83443d8 ffff8801d8344290 [ 32.446159] ffffffff838cba90 ffff8801d8344330 ffff8801d83443d0 ffff8800baa5ed60 [ 32.454161] ffffffff00000000 ffff8801d81d9100 0000000000000000 ffff8801d81d9130 [ 32.462171] Call Trace: [ 32.464733] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 32.471031] [] ? _raw_read_unlock_bh+0x30/0x40 [ 32.477239] [] pppol2tp_connect+0x10f0/0x1910 [ 32.483371] [] ? pppol2tp_recv+0x320/0x320 [ 32.489247] [] ? security_socket_connect+0x8f/0xc0 [ 32.495804] [] SYSC_connect+0x1b8/0x300 [ 32.501421] [] ? SYSC_perf_event_open+0x211/0x2470 [ 32.507971] [] ? SYSC_bind+0x280/0x280 [ 32.513485] [] ? do_futex+0x17f0/0x17f0 [ 32.519082] [] ? move_addr_to_kernel+0x50/0x50 [ 32.525303] [] SyS_connect+0x24/0x30 [ 32.530660] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.537209] 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 [ 32.564084] RIP [] l2tp_session_create+0x948/0x1030 [ 32.570852] RSP [ 32.574460] CR2: 0000000000000080 [ 32.581734] ---[ end trace 258d8d7b0147da0c ]--- [ 32.587668] Kernel panic - not syncing: Fatal exception [ 32.593340] Dumping ftrace buffer: [ 32.596858] (ftrace buffer empty) [ 32.600547] Kernel Offset: disabled [ 32.604147] Rebooting in 86400 seconds..