[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.397889] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.427245] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.842432] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.556852] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 28.733413] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 34.273355] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) 2018/08/22 23:47:25 parsed 1 programs [ 35.392460] random: cc1: uninitialized urandom read (8 bytes read, 82 bits of entropy available) 2018/08/22 23:47:27 executed programs: 0 [ 36.633918] IPVS: Creating netns size=2552 id=1 [ 36.883393] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.898765] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.984488] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.999883] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.084429] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.100544] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.117813] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.135668] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.892461] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.937300] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.234927] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.493745] hrtimer: interrupt took 24491 ns [ 38.786975] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.987237] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 39.190545] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 39.198824] IP: [] l2tp_session_create+0x948/0x1030 [ 39.205536] PGD 1d4868067 PUD 1d48fc067 PMD 0 [ 39.210525] Oops: 0002 [#1] PREEMPT SMP KASAN [ 39.215488] Dumping ftrace buffer: [ 39.219003] (ftrace buffer empty) [ 39.222689] Modules linked in: [ 39.225985] CPU: 0 PID: 4434 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 39.233596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.242930] task: ffff8801d69f0000 task.stack: ffff8801d7af0000 [ 39.248963] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 39.258101] RSP: 0018:ffff8801d7af7b48 EFLAGS: 00010246 [ 39.263526] RAX: 0000000000000000 RBX: ffff8801d8f6bb80 RCX: 0000000000000006 [ 39.270773] RDX: 1ffff1003b1ed7a0 RSI: ffffffff835a4543 RDI: ffff8801d8f6bd00 [ 39.278030] RBP: ffff8801d7af7bb8 R08: ffff8801d69f0900 R09: 0000000000000000 [ 39.285288] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d49a0aa8 [ 39.292545] R13: ffff8801d7af7cd0 R14: ffff8801d49a0a00 R15: ffffffff835a3170 [ 39.299806] FS: 00007f6a5ec01700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.308012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.313871] CR2: 0000000000000080 CR3: 00000001d486a000 CR4: 00000000001606f0 [ 39.321119] Stack: [ 39.323245] ffffffff81140a6a ffff8801d8f6bba0 ffff8801d49a0b58 ffff8801d49a0a10 [ 39.331251] ffffffff838cba90 ffff8801d49a0ab0 ffff8801d49a0b50 ffff8801d8f6bc60 [ 39.339260] ffffffff00000000 ffff8801d9b1c400 0000000000000000 ffff8801d9b1c430 [ 39.347264] Call Trace: [ 39.349833] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 39.356132] [] ? _raw_read_unlock_bh+0x30/0x40 [ 39.362345] [] pppol2tp_connect+0x10f0/0x1910 [ 39.368473] [] ? pppol2tp_recv+0x320/0x320 [ 39.374340] [] ? security_socket_connect+0x8f/0xc0 [ 39.380897] [] SYSC_connect+0x1b8/0x300 [ 39.386501] [] ? SYSC_perf_event_open+0x211/0x2470 [ 39.393059] [] ? SYSC_bind+0x280/0x280 [ 39.398576] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.404791] [] ? do_futex+0x17f0/0x17f0 [ 39.410393] [] ? move_addr_to_kernel+0x50/0x50 [ 39.416605] [] SyS_connect+0x24/0x30 [ 39.421968] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.428522] 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 [ 39.455572] RIP [] l2tp_session_create+0x948/0x1030 [ 39.462342] RSP [ 39.465941] CR2: 0000000000000080 [ 39.470862] ---[ end trace d4ec54ce06fb15f7 ]--- [ 39.475616] Kernel panic - not syncing: Fatal exception [ 39.481257] Dumping ftrace buffer: [ 39.484787] (ftrace buffer empty) [ 39.488474] Kernel Offset: disabled [ 39.492076] Rebooting in 86400 seconds..