[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.615327] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   14.286058] random: sshd: uninitialized urandom read (32 bytes read)
[   14.535685] random: sshd: uninitialized urandom read (32 bytes read)
[   15.068940] random: sshd: uninitialized urandom read (32 bytes read)
[   24.501726] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts.
[   30.090890] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:59:49 parsed 1 programs
[   31.531485] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:59:52 executed programs: 0
[   32.696572] IPVS: Creating netns size=2536 id=1
[   32.850372] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   32.863158] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   32.906710] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   32.919957] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   32.963915] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   32.975901] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   32.988844] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   33.002988] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   33.520716] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   33.547107] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   33.553275] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   33.560711] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   33.761179] hrtimer: interrupt took 12431 ns
[   33.878502] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   33.970370] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   33.978588] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   33.985269] PGD 1d6dd5067 [   33.987911] PUD 1da221067 
PMD 0 [   33.991382] 
[   33.993001] Oops: 0002 [#1] PREEMPT SMP KASAN
[   33.997555] Dumping ftrace buffer:
[   34.001065]    (ftrace buffer empty)
[   34.004749] Modules linked in:
[   34.008040] CPU: 0 PID: 4252 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   34.015630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.024959] task: ffff8801d5706000 task.stack: ffff8801d4d88000
[   34.030990] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   34.040106] RSP: 0018:ffff8801d4d8fab0  EFLAGS: 00010246
[   34.045524] RAX: 0000000000000000 RBX: ffff8801d83af900 RCX: 1ffff1003aae0d1d
[   34.052767] RDX: 1ffff1003af99eb0 RSI: ffff8801d57068c8 RDI: ffff8801d7ccf580
[   34.060010] RBP: ffff8801d4d8fb50 R08: ffff8801d57068e8 R09: 0000000000000000
[   34.067250] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d7ccf458
[   34.074496] R13: 0000000000000000 R14: ffff8801d7ccf400 R15: ffff8801d4d8fc68
[   34.081743] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7712b40
[   34.089941] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   34.095798] CR2: 0000000000000080 CR3: 00000001d77f4000 CR4: 00000000001606f0
[   34.103048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   34.110361] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   34.117608] Stack:
[   34.119730]  0000000000000201 ffffffff836ca141 ffff8801d4d8fad0 ffffffff81237f0d
[   34.127711]  ffff8801d7ccf400 ffff8801d83afa58 ffff8801d7ccf458 ffff8801d83afa50
[   34.135690]  ffff8801d83af9b0 ffff8801d7ccf420 0000000000000000 0000000000000000
[   34.143677] Call Trace:
[   34.146240]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   34.152360]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   34.158304]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   34.164419]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   34.170624]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   34.177179]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   34.182775]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   34.188293]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   34.195280]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   34.201487]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   34.206820]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   34.212241]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   34.218368]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   34.225011]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   34.231213] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 
[   34.258046] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   34.264806]  RSP <ffff8801d4d8fab0>
[   34.268403] CR2: 0000000000000080
[   34.272759] ---[ end trace 249e0ec82c37b951 ]---
[   34.277512] Kernel panic - not syncing: Fatal exception
[   34.283185] Dumping ftrace buffer:
[   34.286700]    (ftrace buffer empty)
[   34.290383] Kernel Offset: disabled
[   34.293984] Rebooting in 86400 seconds..