[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.907895] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.729009] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.222932] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.934602] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 29.128947] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 34.785604] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) 2018/08/22 13:50:30 parsed 1 programs [ 36.372083] random: cc1: uninitialized urandom read (8 bytes read, 82 bits of entropy available) 2018/08/22 13:50:33 executed programs: 0 [ 38.025750] IPVS: Creating netns size=2552 id=1 [ 38.274488] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 38.290707] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 38.375858] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 38.390637] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 38.474786] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.490193] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.507791] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 38.524431] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 39.275981] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 39.314912] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 39.615438] hrtimer: interrupt took 13340 ns [ 39.698934] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 39.746822] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 39.755229] IP: [] l2tp_session_create+0x948/0x1030 [ 39.761917] PGD 1d8552067 PUD 1d825c067 PMD 0 [ 39.766863] Oops: 0002 [#1] PREEMPT SMP KASAN [ 39.771854] Dumping ftrace buffer: [ 39.775378] (ftrace buffer empty) [ 39.779071] Modules linked in: [ 39.782379] CPU: 0 PID: 4196 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 39.789984] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.799329] task: ffff8801d7f30000 task.stack: ffff8801d7bf0000 [ 39.805384] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 39.814521] RSP: 0018:ffff8801d7bf7b48 EFLAGS: 00010246 [ 39.819956] RAX: 0000000000000000 RBX: ffff8800ba37d180 RCX: 0000000000000006 [ 39.827217] RDX: 1ffff1001746fa60 RSI: ffffffff835a4543 RDI: ffff8800ba37d300 [ 39.834475] RBP: ffff8801d7bf7bb8 R08: ffff8801d7f30900 R09: 0000000000000000 [ 39.841734] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d81e59a8 [ 39.848998] R13: ffff8801d7bf7cd0 R14: ffff8801d81e5900 R15: ffffffff835a3170 [ 39.856268] FS: 00007f03fc8dd700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.864494] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.870526] CR2: 0000000000000080 CR3: 00000001d98dc000 CR4: 00000000001606f0 [ 39.877799] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.885064] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.892322] Stack: [ 39.894461] ffffffff81140a6a ffff8800ba37d1a0 ffff8801d81e5a58 ffff8801d81e5910 [ 39.902489] ffffffff838cba90 ffff8801d81e59b0 ffff8801d81e5a50 ffff8800ba37d260 [ 39.910514] ffffffff00000000 ffff8801d89f3b80 0000000000000000 ffff8801d89f3bb0 [ 39.918536] Call Trace: [ 39.921114] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 39.927428] [] ? _raw_read_unlock_bh+0x30/0x40 [ 39.933656] [] pppol2tp_connect+0x10f0/0x1910 [ 39.939795] [] ? pppol2tp_recv+0x320/0x320 [ 39.945674] [] ? security_socket_connect+0x8f/0xc0 [ 39.952247] [] SYSC_connect+0x1b8/0x300 [ 39.957858] [] ? SYSC_perf_event_open+0x211/0x2470 [ 39.964424] [] ? SYSC_bind+0x280/0x280 [ 39.969950] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.976200] [] ? do_futex+0x17f0/0x17f0 [ 39.981814] [] ? move_addr_to_kernel+0x50/0x50 [ 39.988035] [] SyS_connect+0x24/0x30 [ 39.993389] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.999945] 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 [ 40.027338] RIP [] l2tp_session_create+0x948/0x1030 [ 40.034121] RSP [ 40.037727] CR2: 0000000000000080 [ 40.043769] ---[ end trace 70c6187f0a34a0fd ]--- [ 40.048529] Kernel panic - not syncing: Fatal exception [ 40.054257] Dumping ftrace buffer: [ 40.057790] (ftrace buffer empty) [ 40.061582] Kernel Offset: disabled [ 40.065189] Rebooting in 86400 seconds..