[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.046524] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.846771] random: sshd: uninitialized urandom read (32 bytes read) [ 21.212615] random: sshd: uninitialized urandom read (32 bytes read) [ 21.724915] random: sshd: uninitialized urandom read (32 bytes read) [ 21.874329] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 27.359542] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 05:04:27 parsed 1 programs [ 29.204652] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 05:04:30 executed programs: 0 [ 30.417656] IPVS: Creating netns size=2536 id=1 [ 30.542579] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.554308] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.599301] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 30.610994] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 30.657060] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 30.668577] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 30.680827] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.694311] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 31.207704] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.234349] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 31.240708] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 31.247880] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.450416] hrtimer: interrupt took 42873 ns [ 31.549507] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 31.566367] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 31.834692] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.054923] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.142942] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.185899] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.229666] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.271401] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.347835] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.487529] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.637680] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.897764] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 32.997205] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 33.093445] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 33.113839] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 33.122085] IP: [] l2tp_session_create+0xc60/0x16f0 [ 33.128767] PGD 1d70e2067 [ 33.131417] PUD 1d3926067 PMD 0 [ 33.134893] [ 33.136521] Oops: 0002 [#1] PREEMPT SMP KASAN [ 33.141010] Dumping ftrace buffer: [ 33.144535] (ftrace buffer empty) [ 33.148218] Modules linked in: [ 33.151508] CPU: 0 PID: 4791 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #30 [ 33.159106] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.168460] task: ffff8801cd2db000 task.stack: ffff8801ccba8000 [ 33.174524] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 33.183656] RSP: 0018:ffff8801ccbafab0 EFLAGS: 00010246 [ 33.189090] RAX: 0000000000000000 RBX: ffff8801cd37ef00 RCX: 1ffff10039a5b71d [ 33.196347] RDX: 1ffff10039a6feb0 RSI: ffff8801cd2db8c8 RDI: ffff8801cd37f580 [ 33.203615] RBP: ffff8801ccbafb50 R08: ffff8801cd2db8e8 R09: 0000000000000000 [ 33.210893] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cd37f458 [ 33.218158] R13: 0000000000000000 R14: ffff8801cd37f400 R15: ffff8801ccbafc68 [ 33.225436] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77e8b40 [ 33.233641] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.239519] CR2: 0000000000000080 CR3: 00000001cc40d000 CR4: 00000000001606f0 [ 33.246771] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.254026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.261279] Stack: [ 33.263408] 0000000000000201 ffffffff836c9151 ffff8801ccbafad0 ffffffff81237ecd [ 33.271405] ffff8801cd37f400 ffff8801cd37f058 ffff8801cd37f458 ffff8801cd37f050 [ 33.279408] ffff8801cd37efb0 ffff8801cd37f420 0000000000000000 0000000000000000 [ 33.287427] Call Trace: [ 33.290000] [] ? l2tp_session_get+0x1d1/0x790 [ 33.296138] [] ? trace_hardirqs_on+0xd/0x10 [ 33.302106] [] pppol2tp_connect+0x10d7/0x18f0 [ 33.308234] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 33.314449] [] ? security_socket_connect+0x8f/0xc0 [ 33.321021] [] SYSC_connect+0x1b8/0x300 [ 33.326625] [] ? SYSC_bind+0x280/0x280 [ 33.332169] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 33.339216] [] SyS_connect+0x24/0x30 [ 33.344567] [] ? SyS_accept+0x30/0x30 [ 33.350000] [] do_fast_syscall_32+0x2f7/0x870 [ 33.356133] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.362801] [] entry_SYSENTER_compat+0x90/0xa2 [ 33.369003] 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 [ 33.395919] RIP [] l2tp_session_create+0xc60/0x16f0 [ 33.402713] RSP [ 33.406310] CR2: 0000000000000080 [ 33.410098] ---[ end trace f705867f2960f743 ]--- [ 33.414872] Kernel panic - not syncing: Fatal exception [ 33.420644] Dumping ftrace buffer: [ 33.424167] (ftrace buffer empty) [ 33.427850] Kernel Offset: disabled [ 33.431455] Rebooting in 86400 seconds..