[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.478494] 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: [ 24.373339] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.634706] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.228044] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 53.888030] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 59.582540] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) 2018/08/29 00:01:00 parsed 1 programs [ 60.578740] random: cc1: uninitialized urandom read (8 bytes read, 76 bits of entropy available) 2018/08/29 00:01:01 executed programs: 0 [ 61.645453] IPVS: Creating netns size=2552 id=1 [ 61.882333] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 61.899458] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 61.979715] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 61.995745] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 62.078576] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 62.093227] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 62.109115] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 62.127811] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 62.857843] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 62.895305] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 63.206106] hrtimer: interrupt took 40688 ns [ 63.586720] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 63.595076] IP: [] l2tp_session_create+0x948/0x1030 [ 63.601755] PGD b0725067 PUD ba560067 PMD 0 [ 63.606606] Oops: 0002 [#1] PREEMPT SMP KASAN [ 63.611550] Dumping ftrace buffer: [ 63.615065] (ftrace buffer empty) [ 63.618748] Modules linked in: [ 63.622034] CPU: 1 PID: 4255 Comm: syz-executor0 Not tainted 4.4.153-g5e24b4e #90 [ 63.629752] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.639082] task: ffff8801d6e59800 task.stack: ffff8800b95a0000 [ 63.645111] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 63.654293] RSP: 0018:ffff8800b95a7b48 EFLAGS: 00010246 [ 63.659730] RAX: 0000000000000000 RBX: ffff8800b97ad900 RCX: 0000000000000006 [ 63.666994] RDX: 1ffff100172f5b50 RSI: ffffffff835a4c93 RDI: ffff8800b97ada80 [ 63.674254] RBP: ffff8800b95a7bb8 R08: 000000000000000a R09: 000000000000ffff [ 63.681515] R10: ffffed003b436868 R11: ffffffff8463a200 R12: ffff8801da1b4328 [ 63.688773] R13: ffff8800b95a7cd0 R14: ffff8801da1b4280 R15: ffffffff835a38c0 [ 63.696033] FS: 00007f52c5efb700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 63.704251] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.710123] CR2: 0000000000000080 CR3: 00000000b947d000 CR4: 00000000001606f0 [ 63.717397] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.724657] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.731914] Stack: [ 63.734049] ffffffff81140aba ffff8800b97ad920 ffff8801da1b43d8 ffff8801da1b4290 [ 63.742071] ffffffff838cc1e0 ffff8801da1b4330 ffff8801da1b43d0 ffff8800b97ad9e0 [ 63.750093] ffffffff00000000 ffff8800b00d7700 0000000000000000 ffff8800b00d7730 [ 63.758112] Call Trace: [ 63.760690] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 63.767007] [] ? _raw_read_unlock_bh+0x30/0x40 [ 63.773236] [] pppol2tp_connect+0x10f0/0x1910 [ 63.779370] [] ? pppol2tp_recv+0x320/0x320 [ 63.785257] [] ? lock_acquire+0x19f/0x450 [ 63.791048] [] ? security_socket_connect+0x8f/0xc0 [ 63.797618] [] SYSC_connect+0x1b8/0x300 [ 63.803228] [] ? retint_kernel+0x2d/0x2d [ 63.808928] [] ? SYSC_bind+0x280/0x280 [ 63.814455] [] ? do_futex+0x17f0/0x17f0 [ 63.820072] [] ? retint_user+0x18/0x3c [ 63.825600] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 63.832430] [] SyS_connect+0x24/0x30 [ 63.837780] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 63.844333] 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 [ 63.871548] RIP [] l2tp_session_create+0x948/0x1030 [ 63.878324] RSP [ 63.881930] CR2: 0000000000000080 [ 63.891042] ---[ end trace fd74ee68286a3334 ]--- [ 63.895796] Kernel panic - not syncing: Fatal exception [ 63.901461] Dumping ftrace buffer: [ 63.904980] (ftrace buffer empty) [ 63.908664] Kernel Offset: disabled [ 63.912270] Rebooting in 86400 seconds..