[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.469841] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.438326] random: sshd: uninitialized urandom read (32 bytes read) [ 19.772623] random: sshd: uninitialized urandom read (32 bytes read) [ 20.233180] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 25.969061] urandom_read: 1 callbacks suppressed [ 25.969064] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 05:12:17 parsed 1 programs [ 27.005301] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 05:12:18 executed programs: 0 [ 28.040015] IPVS: Creating netns size=2536 id=1 [ 28.167210] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 28.180808] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 28.224808] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 28.236235] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 28.279305] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 28.290752] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 28.302837] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 28.323727] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.839397] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.863911] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.870043] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.877301] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 29.100978] hrtimer: interrupt took 20571 ns [ 29.159917] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.200641] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.241861] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.265607] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.309091] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.332937] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.350576] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 29.392235] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 29.400560] IP: [] l2tp_session_create+0xc60/0x16f0 [ 29.407260] PGD 1da11b067 [ 29.409910] PUD 1d4734067 PMD 0 [ 29.414204] [ 29.415855] Oops: 0002 [#1] PREEMPT SMP KASAN [ 29.420336] Dumping ftrace buffer: [ 29.423859] (ftrace buffer empty) [ 29.427557] Modules linked in: [ 29.430873] CPU: 0 PID: 4319 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #26 [ 29.438645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.447989] task: ffff8801d5219800 task.stack: ffff8801d50f0000 [ 29.454223] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 29.463368] RSP: 0018:ffff8801d50f7ac0 EFLAGS: 00010246 [ 29.469216] RAX: 0000000000000000 RBX: ffff8801d7fe0f00 RCX: 1ffff1003aa4341d [ 29.476481] RDX: 1ffff1003affc170 RSI: ffff8801d521a0c8 RDI: ffff8801d7fe0b80 [ 29.483911] RBP: ffff8801d50f7b60 R08: ffff8801d521a0e8 R09: 0000000000000000 [ 29.491176] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d7fe0a58 [ 29.498584] R13: 0000000000000000 R14: ffff8801d7fe0a00 R15: ffff8801d50f7c78 [ 29.505847] FS: 00007f7d7411e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.514255] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.520154] CR2: 0000000000000080 CR3: 00000001d761a000 CR4: 00000000001606f0 [ 29.527418] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.535133] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.542814] Stack: [ 29.544956] 0000000000000201 ffffffff836c9151 ffff8801d50f7ae0 ffffffff81237ecd [ 29.553033] ffff8801d7fe0a00 ffff8801d7fe1058 ffff8801d7fe0a58 ffff8801d7fe1050 [ 29.561238] ffff8801d7fe0fb0 ffff8801d7fe0a20 0000000000000000 0000000000000000 [ 29.569291] Call Trace: [ 29.571872] [] ? l2tp_session_get+0x1d1/0x790 [ 29.578163] [] ? trace_hardirqs_on+0xd/0x10 [ 29.584315] [] pppol2tp_connect+0x10d7/0x18f0 [ 29.590575] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 29.596795] [] ? lock_acquire+0x173/0x3e0 [ 29.602580] [] ? security_socket_connect+0x8f/0xc0 [ 29.609155] [] SYSC_connect+0x1b8/0x300 [ 29.614864] [] ? SYSC_bind+0x280/0x280 [ 29.620748] [] ? do_futex+0x17c0/0x17c0 [ 29.626361] [] ? move_addr_to_kernel+0x50/0x50 [ 29.632710] [] SyS_connect+0x24/0x30 [ 29.638061] [] ? SyS_accept+0x30/0x30 [ 29.643615] [] do_syscall_64+0x1a6/0x490 [ 29.649410] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.656317] 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 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 29.684728] RIP [] l2tp_session_create+0xc60/0x16f0 [ 29.691598] RSP [ 29.695208] CR2: 0000000000000080 [ 29.699918] ---[ end trace 8d2f20cc4181aa35 ]--- [ 29.704959] Kernel panic - not syncing: Fatal exception [ 29.710815] Dumping ftrace buffer: [ 29.714347] (ftrace buffer empty) [ 29.718043] Kernel Offset: disabled [ 29.721662] Rebooting in 86400 seconds..