[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.676030] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.962406] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.409818] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.999863] random: sshd: uninitialized urandom read (32 bytes read, 54 bits of entropy available) [ 28.179595] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 33.886928] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) 2018/08/22 21:28:24 parsed 1 programs [ 35.310452] random: cc1: uninitialized urandom read (8 bytes read, 64 bits of entropy available) 2018/08/22 21:28:28 executed programs: 0 [ 37.775220] IPVS: Creating netns size=2552 id=1 [ 38.019982] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 38.035963] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 38.120482] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 38.136073] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 38.220266] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.234872] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.251230] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 38.267009] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 39.004894] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 39.043460] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 39.374613] hrtimer: interrupt took 21049 ns [ 39.674296] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 39.682695] IP: [] l2tp_session_create+0x948/0x1030 [ 39.689380] PGD 1d8088067 PUD 1da2ee067 PMD 0 [ 39.694301] Oops: 0002 [#1] PREEMPT SMP KASAN [ 39.699270] Dumping ftrace buffer: [ 39.702785] (ftrace buffer empty) [ 39.706469] Modules linked in: [ 39.709764] CPU: 1 PID: 4324 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 39.717354] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.726680] task: ffff8801d6dd8000 task.stack: ffff8800b9720000 [ 39.732714] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 39.741903] RSP: 0018:ffff8800b9727b48 EFLAGS: 00010246 [ 39.747330] RAX: 0000000000000000 RBX: ffff8801da0aea00 RCX: 0000000000000006 [ 39.754577] RDX: 1ffff1003b415d70 RSI: ffffffff835a4543 RDI: ffff8801da0aeb80 [ 39.761948] RBP: ffff8800b9727bb8 R08: ffff8801d6dd8900 R09: 0000000000000000 [ 39.769272] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da0f0828 [ 39.776523] R13: ffff8800b9727cd0 R14: ffff8801da0f0780 R15: ffffffff835a3170 [ 39.783787] FS: 00007f65bdceb700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.792107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.798000] CR2: 0000000000000080 CR3: 00000001c8608000 CR4: 00000000001606f0 [ 39.805249] Stack: [ 39.807381] ffffffff81140a6a ffff8801da0aea20 ffff8801da0f08d8 ffff8801da0f0790 [ 39.815393] ffffffff838cba90 ffff8801da0f0830 ffff8801da0f08d0 ffff8801da0aeae0 [ 39.823433] ffffffff00000000 ffff8801d6975500 0000000000000000 ffff8801d6975530 [ 39.831425] Call Trace: [ 39.834031] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 39.840333] [] ? _raw_read_unlock_bh+0x30/0x40 [ 39.846603] [] pppol2tp_connect+0x10f0/0x1910 [ 39.852734] [] ? pppol2tp_recv+0x320/0x320 [ 39.858601] [] ? security_socket_connect+0x8f/0xc0 [ 39.865163] [] SYSC_connect+0x1b8/0x300 [ 39.870766] [] ? SYSC_bind+0x280/0x280 [ 39.876276] [] ? get_unused_fd_flags+0xd0/0xd0 [ 39.882501] [] ? do_futex+0x17f0/0x17f0 [ 39.888114] [] ? SyS_socket+0x121/0x1b0 [ 39.893713] [] ? move_addr_to_kernel+0x50/0x50 [ 39.900037] [] SyS_connect+0x24/0x30 [ 39.905382] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 39.911929] 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 [ 39.938953] RIP [] l2tp_session_create+0x948/0x1030 [ 39.945726] RSP [ 39.949339] CR2: 0000000000000080 [ 39.955179] ---[ end trace 9b8929e9993da377 ]--- [ 39.961008] Kernel panic - not syncing: Fatal exception [ 39.966763] Dumping ftrace buffer: [ 39.970283] (ftrace buffer empty) [ 39.973968] Kernel Offset: disabled [ 39.977567] Rebooting in 86400 seconds..