[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.627920] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.335579] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.617258] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.317343] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 26.488492] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 32.129306] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) 2018/08/22 22:02:12 parsed 1 programs [ 33.286286] random: cc1: uninitialized urandom read (8 bytes read, 76 bits of entropy available) 2018/08/22 22:02:14 executed programs: 0 [ 34.767438] IPVS: Creating netns size=2552 id=1 [ 35.014429] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.029942] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.112941] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.128080] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.219656] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.233615] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.250675] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 35.267916] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.015865] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.054674] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 36.342670] hrtimer: interrupt took 34946 ns [ 36.351709] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 36.760104] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 37.504790] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 37.513067] IP: [] l2tp_session_create+0x948/0x1030 [ 37.519789] PGD 1d831c067 PUD 1d6725067 PMD 0 [ 37.524734] Oops: 0002 [#1] PREEMPT SMP KASAN [ 37.529715] Dumping ftrace buffer: [ 37.533233] (ftrace buffer empty) [ 37.536928] Modules linked in: [ 37.540241] CPU: 0 PID: 4474 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 37.547840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.557193] task: ffff8801d44d9800 task.stack: ffff8801d3d60000 [ 37.563229] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 37.572385] RSP: 0018:ffff8801d3d67b48 EFLAGS: 00010246 [ 37.577838] RAX: 0000000000000000 RBX: ffff8800b778cf00 RCX: 0000000000000006 [ 37.585107] RDX: 1ffff10016ef1a10 RSI: ffffffff835a4543 RDI: ffff8800b778d080 [ 37.592361] RBP: ffff8801d3d67bb8 R08: ffff8801d44da100 R09: 0000000000000000 [ 37.599623] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b778c5a8 [ 37.606881] R13: ffff8801d3d67cd0 R14: ffff8800b778c500 R15: ffffffff835a3170 [ 37.614232] FS: 00007f45c94dc700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.622455] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.628323] CR2: 0000000000000080 CR3: 00000001da3bf000 CR4: 00000000001606f0 [ 37.635575] Stack: [ 37.637706] ffffffff81140a6a ffff8800b778cf20 ffff8800b778c658 ffff8800b778c510 [ 37.645733] ffffffff838cba90 ffff8800b778c5b0 ffff8800b778c650 ffff8800b778cfe0 [ 37.653799] ffffffff00000000 ffff8801d42b0880 0000000000000000 ffff8801d42b08b0 [ 37.661818] Call Trace: [ 37.664402] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 37.670706] [] ? _raw_read_unlock_bh+0x30/0x40 [ 37.676926] [] pppol2tp_connect+0x10f0/0x1910 [ 37.683053] [] ? pppol2tp_recv+0x320/0x320 [ 37.688923] [] ? security_socket_connect+0x8f/0xc0 [ 37.695484] [] SYSC_connect+0x1b8/0x300 [ 37.701095] [] ? SYSC_perf_event_open+0x211/0x2470 [ 37.707661] [] ? SYSC_bind+0x280/0x280 [ 37.713181] [] ? get_unused_fd_flags+0xd0/0xd0 [ 37.719399] [] ? do_futex+0x17f0/0x17f0 [ 37.725007] [] ? move_addr_to_kernel+0x50/0x50 [ 37.731227] [] SyS_connect+0x24/0x30 [ 37.736575] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.743132] 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 [ 37.770516] RIP [] l2tp_session_create+0x948/0x1030 [ 37.777311] RSP [ 37.780915] CR2: 0000000000000080 [ 37.787039] ---[ end trace 1c34112077c1d3d5 ]--- [ 37.791833] Kernel panic - not syncing: Fatal exception [ 37.797498] Dumping ftrace buffer: [ 37.801021] (ftrace buffer empty) [ 37.804705] Kernel Offset: disabled [ 37.808305] Rebooting in 86400 seconds..