[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.800159] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.730846] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 27.130198] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 27.819223] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 53.447117] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 58.944823] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) 2018/08/23 13:19:57 parsed 1 programs [ 60.074015] random: cc1: uninitialized urandom read (8 bytes read, 84 bits of entropy available) 2018/08/23 13:19:59 executed programs: 0 [ 61.467414] IPVS: Creating netns size=2552 id=1 [ 61.715180] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 61.731998] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 61.813975] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 61.830323] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 61.913544] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 61.928035] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 61.946024] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 61.962338] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 62.006209] ip (3900) used greatest stack depth: 23584 bytes left [ 62.716293] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 62.756591] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 63.050542] hrtimer: interrupt took 30314 ns [ 63.877427] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 64.039010] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 64.047275] IP: [] l2tp_session_create+0x948/0x1030 [ 64.053957] PGD 1d46f5067 PUD 1d46f1067 PMD 0 [ 64.058876] Oops: 0002 [#1] PREEMPT SMP KASAN [ 64.063856] Dumping ftrace buffer: [ 64.067370] (ftrace buffer empty) [ 64.071055] Modules linked in: [ 64.074343] CPU: 0 PID: 4515 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #85 [ 64.081941] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.091276] task: ffff8801d4ad8000 task.stack: ffff8801d42a8000 [ 64.097306] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 64.106435] RSP: 0018:ffff8801d42afb48 EFLAGS: 00010246 [ 64.111856] RAX: 0000000000000000 RBX: ffff8801d466f400 RCX: 0000000000000006 [ 64.119102] RDX: 1ffff1003a8cdeb0 RSI: ffffffff835a4543 RDI: ffff8801d466f580 [ 64.126344] RBP: ffff8801d42afbb8 R08: ffff8801d4ad8900 R09: 0000000000000000 [ 64.133611] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b7ae7728 [ 64.140862] R13: ffff8801d42afcd0 R14: ffff8800b7ae7680 R15: ffffffff835a3170 [ 64.148124] FS: 00007f0902aae700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 64.156356] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.162217] CR2: 0000000000000080 CR3: 00000001d4892000 CR4: 00000000001606f0 [ 64.169464] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.176708] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.183954] Stack: [ 64.186078] ffffffff81140a6a ffff8801d466f420 ffff8800b7ae77d8 ffff8800b7ae7690 [ 64.194072] ffffffff838cba90 ffff8800b7ae7730 ffff8800b7ae77d0 ffff8801d466f4e0 [ 64.202067] ffffffff00000000 ffff8800b8eeb300 0000000000000000 ffff8800b8eeb330 [ 64.210097] Call Trace: [ 64.212666] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 64.218961] [] ? _raw_read_unlock_bh+0x30/0x40 [ 64.225170] [] pppol2tp_connect+0x10f0/0x1910 [ 64.231288] [] ? pppol2tp_recv+0x320/0x320 [ 64.237153] [] ? security_socket_connect+0x8f/0xc0 [ 64.243708] [] SYSC_connect+0x1b8/0x300 [ 64.249329] [] ? SYSC_perf_event_open+0x211/0x2470 [ 64.255892] [] ? SYSC_bind+0x280/0x280 [ 64.261405] [] ? get_unused_fd_flags+0xd0/0xd0 [ 64.267612] [] ? do_futex+0x17f0/0x17f0 [ 64.273215] [] ? retint_user+0x18/0x3c [ 64.278726] [] SyS_connect+0x24/0x30 [ 64.284064] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 64.290616] 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 [ 64.317618] RIP [] l2tp_session_create+0x948/0x1030 [ 64.324388] RSP [ 64.327985] CR2: 0000000000000080 [ 64.333449] ---[ end trace 7b6d025969249e5f ]--- [ 64.338205] Kernel panic - not syncing: Fatal exception [ 64.343900] Dumping ftrace buffer: [ 64.347421] (ftrace buffer empty) [ 64.351347] Kernel Offset: disabled [ 64.354949] Rebooting in 86400 seconds..