[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.454603] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.643396] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.991581] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.733992] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 26.912958] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 32.423013] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) 2018/08/23 20:32:09 parsed 1 programs [ 33.626669] random: cc1: uninitialized urandom read (8 bytes read, 80 bits of entropy available) 2018/08/23 20:32:12 executed programs: 0 [ 35.065520] IPVS: Creating netns size=2552 id=1 [ 35.311703] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.327911] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.412236] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.427063] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.509459] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.531602] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.546837] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 35.564080] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.314949] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.354196] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 36.644871] hrtimer: interrupt took 18800 ns [ 36.679109] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.720985] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 39.972441] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 2018/08/23 20:32:17 executed programs: 172 [ 40.980946] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 41.344456] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 41.352733] IP: [] l2tp_session_create+0x948/0x1030 [ 41.359425] PGD af1ed067 PUD af33f067 PMD 0 [ 41.364213] Oops: 0002 [#1] PREEMPT SMP KASAN [ 41.369171] Dumping ftrace buffer: [ 41.372685] (ftrace buffer empty) [ 41.376380] Modules linked in: [ 41.379673] CPU: 1 PID: 5153 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #86 [ 41.387268] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.396619] task: ffff8801c8476000 task.stack: ffff8800ad2a8000 [ 41.402662] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 41.411790] RSP: 0018:ffff8800ad2afb48 EFLAGS: 00010246 [ 41.417216] RAX: 0000000000000000 RBX: ffff8800b5737400 RCX: 0000000000000006 [ 41.424464] RDX: 1ffff10016ae6eb0 RSI: ffffffff835a4633 RDI: ffff8800b5737580 [ 41.431709] RBP: ffff8800ad2afbb8 R08: ffff8801c8476900 R09: 0000000000000000 [ 41.438958] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801c80100a8 [ 41.446203] R13: ffff8800ad2afcd0 R14: ffff8801c8010000 R15: ffffffff835a3260 [ 41.453467] FS: 00007f7c2f6e3700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.461687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.467545] CR2: 0000000000000080 CR3: 00000000ad051000 CR4: 00000000001606f0 [ 41.474805] Stack: [ 41.476929] ffffffff81140a6a ffff8800b5737420 ffff8801c8010158 ffff8801c8010010 [ 41.484937] ffffffff838cbb80 ffff8801c80100b0 ffff8801c8010150 ffff8800b57374e0 [ 41.492948] ffffffff00000000 ffff8800ad66c400 0000000000000000 ffff8800ad66c430 [ 41.501010] Call Trace: [ 41.503581] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 41.509881] [] ? _raw_read_unlock_bh+0x30/0x40 [ 41.516091] [] pppol2tp_connect+0x10f0/0x1910 [ 41.522215] [] ? pppol2tp_recv+0x320/0x320 [ 41.528081] [] ? security_socket_connect+0x8f/0xc0 [ 41.534649] [] SYSC_connect+0x1b8/0x300 [ 41.540257] [] ? SYSC_perf_event_open+0x211/0x2470 [ 41.546815] [] ? SYSC_bind+0x280/0x280 [ 41.552350] [] ? get_unused_fd_flags+0xd0/0xd0 [ 41.558562] [] ? do_futex+0x17f0/0x17f0 [ 41.564167] [] ? move_addr_to_kernel+0x50/0x50 [ 41.570419] [] SyS_connect+0x24/0x30 [ 41.575798] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 41.582353] 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 [ 41.609467] RIP [] l2tp_session_create+0x948/0x1030 [ 41.616263] RSP [ 41.619861] CR2: 0000000000000080 [ 41.624254] ---[ end trace 6e4556a56cf92b9b ]--- [ 41.629026] Kernel panic - not syncing: Fatal exception [ 41.634691] Dumping ftrace buffer: [ 41.638222] (ftrace buffer empty) [ 41.641908] Kernel Offset: disabled [ 41.645513] Rebooting in 86400 seconds..