[....] 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[ 12.956948] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.950394] random: sshd: uninitialized urandom read (32 bytes read) [ 21.224885] random: sshd: uninitialized urandom read (32 bytes read) [ 21.752606] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 27.368139] urandom_read: 1 callbacks suppressed [ 27.368143] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/25 08:58:45 parsed 1 programs [ 28.455923] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/25 08:58:47 executed programs: 0 [ 29.267618] IPVS: Creating netns size=2536 id=1 [ 29.391718] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.403437] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.446231] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.457755] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.500473] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.511842] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.523927] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.537307] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 30.031000] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.056457] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 30.062959] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 30.069742] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.276230] hrtimer: interrupt took 22053 ns [ 30.351182] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 30.359397] IP: [] l2tp_session_create+0xc60/0x16f0 [ 30.366077] PGD 1d7a56067 [ 30.368716] PUD 1d6ea9067 PMD 0 [ 30.372192] [ 30.373809] Oops: 0002 [#1] PREEMPT SMP KASAN [ 30.378276] Dumping ftrace buffer: [ 30.381784] (ftrace buffer empty) [ 30.385466] Modules linked in: [ 30.388749] CPU: 1 PID: 4196 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #83 [ 30.396340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.405665] task: ffff8801d6f04800 task.stack: ffff8801c81f0000 [ 30.411689] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 30.420793] RSP: 0018:ffff8801c81f7ac0 EFLAGS: 00010246 [ 30.426216] RAX: 0000000000000000 RBX: ffff8801da17e500 RCX: 1ffff1003ade0a1d [ 30.433460] RDX: 1ffff1003b42fd70 RSI: ffff8801d6f050c8 RDI: ffff8801da17eb80 [ 30.440703] RBP: ffff8801c81f7b60 R08: ffff8801d6f050e8 R09: 0000000000000000 [ 30.447944] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da17ea58 [ 30.455197] R13: 0000000000000000 R14: ffff8801da17ea00 R15: ffff8801c81f7c78 [ 30.462448] FS: 00007f18e7f14700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.470693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.476630] CR2: 0000000000000080 CR3: 00000001d6ed2000 CR4: 00000000001606f0 [ 30.483882] Stack: [ 30.486019] 0000000000000201 ffffffff836c9ec1 ffff8801c81f7ae0 ffffffff812383ad [ 30.494040] ffff8801da17ea00 ffff8801da17e658 ffff8801da17ea58 ffff8801da17e650 [ 30.502083] ffff8801da17e5b0 ffff8801da17ea20 0000000000000000 0000000000000000 [ 30.510071] Call Trace: [ 30.512680] [] ? l2tp_session_get+0x1d1/0x790 [ 30.518819] [] ? trace_hardirqs_on+0xd/0x10 [ 30.524797] [] pppol2tp_connect+0x10d7/0x18f0 [ 30.530910] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 30.537190] [] ? check_preemption_disabled+0x3b/0x170 [ 30.544012] [] ? retint_kernel+0x2d/0x2d [ 30.549698] [] ? move_addr_to_kernel.part.13+0x35/0x110 [ 30.556687] [] ? security_socket_connect+0x8f/0xc0 [ 30.563243] [] SYSC_connect+0x1b8/0x300 [ 30.568843] [] ? SYSC_bind+0x280/0x280 [ 30.574355] [] ? do_futex+0x17c0/0x17c0 [ 30.579953] [] ? move_addr_to_kernel+0x50/0x50 [ 30.586156] [] SyS_connect+0x24/0x30 [ 30.591491] [] ? SyS_accept+0x30/0x30 [ 30.596920] [] do_syscall_64+0x1a6/0x490 [ 30.602606] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.609510] 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 [ 30.636415] RIP [] l2tp_session_create+0xc60/0x16f0 [ 30.643312] RSP [ 30.646910] CR2: 0000000000000080 [ 30.651185] ---[ end trace ae454fbc6d31f4eb ]--- [ 30.656041] Kernel panic - not syncing: Fatal exception [ 30.661674] Dumping ftrace buffer: [ 30.665184] (ftrace buffer empty) [ 30.668869] Kernel Offset: disabled [ 30.672488] Rebooting in 86400 seconds..