[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.334736] 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: [ 24.967581] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.429975] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.097273] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 88.151605] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 93.821423] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) 2018/08/23 20:12:11 parsed 1 programs [ 94.962556] random: cc1: uninitialized urandom read (8 bytes read, 88 bits of entropy available) 2018/08/23 20:12:13 executed programs: 0 [ 96.564034] IPVS: Creating netns size=2552 id=1 [ 96.801276] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 96.815670] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 96.896946] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 96.911400] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 96.992225] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 97.007245] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 97.022326] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 97.038234] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 97.753542] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 97.793474] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 98.074660] hrtimer: interrupt took 17609 ns [ 99.096265] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 99.104509] IP: [] l2tp_session_create+0x948/0x1030 [ 99.111211] PGD b68a8067 PUD b69c1067 PMD 0 [ 99.115984] Oops: 0002 [#1] PREEMPT SMP KASAN [ 99.120975] Dumping ftrace buffer: [ 99.124500] (ftrace buffer empty) [ 99.128197] Modules linked in: [ 99.131500] CPU: 0 PID: 4520 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #86 [ 99.139109] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.148456] task: ffff8800b6be4800 task.stack: ffff8800ac0c0000 [ 99.154502] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 99.163634] RSP: 0018:ffff8800ac0c7b48 EFLAGS: 00010246 [ 99.169064] RAX: 0000000000000000 RBX: ffff8801d3aa7180 RCX: 0000000000000006 [ 99.176316] RDX: 1ffff1003a754e60 RSI: ffffffff835a4633 RDI: ffff8801d3aa7300 [ 99.183568] RBP: ffff8800ac0c7bb8 R08: ffff8800b6be5100 R09: 0000000000000000 [ 99.190823] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d35eb728 [ 99.198078] R13: ffff8800ac0c7cd0 R14: ffff8801d35eb680 R15: ffffffff835a3260 [ 99.205338] FS: 00007f344b45b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 99.213548] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 99.219414] CR2: 0000000000000080 CR3: 00000000b6688000 CR4: 00000000001606f0 [ 99.226668] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 99.233921] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 99.241169] Stack: [ 99.243301] ffffffff81140a6a ffff8801d3aa71a0 ffff8801d35eb7d8 ffff8801d35eb690 [ 99.251332] ffffffff838cbb80 ffff8801d35eb730 ffff8801d35eb7d0 ffff8801d3aa7260 [ 99.259370] ffffffff00000000 ffff8801d3513b80 0000000000000000 ffff8801d3513bb0 [ 99.267392] Call Trace: [ 99.269968] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 99.276275] [] ? _raw_read_unlock_bh+0x30/0x40 [ 99.282492] [] pppol2tp_connect+0x10f0/0x1910 [ 99.288650] [] ? pppol2tp_recv+0x320/0x320 [ 99.294522] [] ? security_socket_connect+0x8f/0xc0 [ 99.301086] [] SYSC_connect+0x1b8/0x300 [ 99.306701] [] ? SYSC_perf_event_open+0x211/0x2470 [ 99.313265] [] ? SYSC_bind+0x280/0x280 [ 99.318818] [] ? get_unused_fd_flags+0xd0/0xd0 [ 99.325039] [] ? do_futex+0x17f0/0x17f0 [ 99.330650] [] ? move_addr_to_kernel+0x50/0x50 [ 99.336874] [] SyS_connect+0x24/0x30 [ 99.342227] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 99.348786] 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 [ 99.376113] RIP [] l2tp_session_create+0x948/0x1030 [ 99.382903] RSP [ 99.386509] CR2: 0000000000000080 [ 99.391023] ---[ end trace 0d1ab5dc4b1a6e40 ]--- [ 99.395864] Kernel panic - not syncing: Fatal exception [ 99.401556] Dumping ftrace buffer: [ 99.405120] (ftrace buffer empty) [ 99.408813] Kernel Offset: disabled [ 99.412415] Rebooting in 86400 seconds..