[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.863296] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.152691] random: sshd: uninitialized urandom read (32 bytes read) [ 18.536068] random: sshd: uninitialized urandom read (32 bytes read) [ 19.069750] random: sshd: uninitialized urandom read (32 bytes read) [ 19.216184] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 24.759932] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/25 08:21:39 parsed 1 programs [ 25.910146] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/25 08:21:41 executed programs: 0 [ 27.243758] IPVS: Creating netns size=2536 id=1 [ 27.369553] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 27.380975] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 27.424473] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 27.435867] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 27.480327] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 27.492639] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 27.504383] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 27.525315] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.034585] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.060294] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.066501] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.074081] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.280754] hrtimer: interrupt took 17295 ns [ 28.327661] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.395295] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.491524] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 28.524171] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 28.532374] IP: [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0 [ 28.539055] PGD 1d7bb9067 [ 28.541709] PUD 1d6e2b067 PMD 0 [ 28.545181] [ 28.546799] Oops: 0002 [#1] PREEMPT SMP KASAN [ 28.551264] Dumping ftrace buffer: [ 28.554781] (ftrace buffer empty) [ 28.558462] Modules linked in: [ 28.561745] CPU: 0 PID: 4274 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #31 [ 28.569336] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.578666] task: ffff8801d5ea8000 task.stack: ffff8801d4ab8000 [ 28.584696] RIP: 0010:[<ffffffff836c8bb0>] [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0 [ 28.593808] RSP: 0018:ffff8801d4abfac0 EFLAGS: 00010246 [ 28.599233] RAX: 0000000000000000 RBX: ffff8801d9854280 RCX: 1ffff1003abd511d [ 28.606723] RDX: 1ffff1003b30a9c0 RSI: ffff8801d5ea88c8 RDI: ffff8801d9854e00 [ 28.613987] RBP: ffff8801d4abfb60 R08: ffff8801d5ea88e8 R09: 0000000000000000 [ 28.621239] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d9854cd8 [ 28.628509] R13: 0000000000000000 R14: ffff8801d9854c80 R15: ffff8801d4abfc78 [ 28.636231] FS: 00007f202cee0700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.644440] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.650304] CR2: 0000000000000080 CR3: 00000001da267000 CR4: 00000000001606f0 [ 28.657559] Stack: [ 28.659712] 0000000000000201 ffffffff836c9ec1 ffff8801d4abfae0 ffffffff812383ad [ 28.667742] ffff8801d9854c80 ffff8801d98543d8 ffff8801d9854cd8 ffff8801d98543d0 [ 28.675816] ffff8801d9854330 ffff8801d9854ca0 0000000000000000 0000000000000000 [ 28.683866] Call Trace: [ 28.686462] [<ffffffff836c9ec1>] ? l2tp_session_get+0x1d1/0x790 [ 28.692594] [<ffffffff812383ad>] ? trace_hardirqs_on+0xd/0x10 [ 28.698550] [<ffffffff836cdd67>] pppol2tp_connect+0x10d7/0x18f0 [ 28.704682] [<ffffffff836ccc90>] ? pppol2tp_seq_show+0xc30/0xc30 [ 28.710923] [<ffffffff81cf902f>] ? security_socket_connect+0x8f/0xc0 [ 28.717489] [<ffffffff8301ea38>] SYSC_connect+0x1b8/0x300 [ 28.723099] [<ffffffff8301e880>] ? SYSC_bind+0x280/0x280 [ 28.728630] [<ffffffff812db650>] ? do_futex+0x17c0/0x17c0 [ 28.734249] [<ffffffff83020910>] ? move_addr_to_kernel+0x50/0x50 [ 28.740472] [<ffffffff83021314>] SyS_connect+0x24/0x30 [ 28.745818] [<ffffffff830212f0>] ? SyS_accept+0x30/0x30 [ 28.751268] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 28.756966] [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.763871] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 28.791173] RIP [<ffffffff836c8bb0>] l2tp_session_create+0xc60/0x16f0 [ 28.797952] RSP <ffff8801d4abfac0> [ 28.801558] CR2: 0000000000000080 [ 28.807720] ---[ end trace ca5894aee401be15 ]--- [ 28.812939] Kernel panic - not syncing: Fatal exception [ 28.818582] Dumping ftrace buffer: [ 28.822105] (ftrace buffer empty) [ 28.825789] Kernel Offset: disabled [ 28.829390] Rebooting in 86400 seconds..