[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.129544] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   26.611381] random: sshd: uninitialized urandom read (32 bytes read)
[   27.281219] random: sshd: uninitialized urandom read (32 bytes read)
[   27.760464] random: sshd: uninitialized urandom read (32 bytes read)
[   44.516492] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts.
[   50.116502] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 03:41:58 parsed 1 programs
[   51.517234] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 03:42:00 executed programs: 0
[   52.759655] IPVS: Creating netns size=2536 id=1
[   52.888053] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   52.900117] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   52.945003] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   52.956571] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   53.001206] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   53.012513] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   53.024215] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   53.036655] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   53.554535] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   53.578718] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   53.584814] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   53.591977] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   53.788922] hrtimer: interrupt took 13264 ns
[   53.803162] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   53.875642] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   53.884154] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   53.890860] PGD 1da283067 [   53.893501] PUD 1d77ff067 
PMD 0 [   53.896986] 
[   53.898613] Oops: 0002 [#1] PREEMPT SMP KASAN
[   53.903082] Dumping ftrace buffer:
[   53.906594]    (ftrace buffer empty)
[   53.910280] Modules linked in:
[   53.913582] CPU: 0 PID: 4120 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   53.921177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.930552] task: ffff8801d7b21800 task.stack: ffff8801d6c18000
[   53.936590] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   53.945716] RSP: 0018:ffff8801d6c1fab0  EFLAGS: 00010246
[   53.951139] RAX: 0000000000000000 RBX: ffff8801d73d8000 RCX: 1ffff1003af6441d
[   53.958385] RDX: 1ffff1003ae7b0d0 RSI: ffff8801d7b220c8 RDI: ffff8801d73d8680
[   53.965636] RBP: ffff8801d6c1fb50 R08: ffff8801d7b220e8 R09: 0000000000000000
[   53.972888] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d73d8558
[   53.980140] R13: 0000000000000000 R14: ffff8801d73d8500 R15: ffff8801d6c1fc68
[   53.987388] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7766b40
[   53.995590] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   54.001452] CR2: 0000000000000080 CR3: 00000001d86f3000 CR4: 00000000001606f0
[   54.008702] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   54.015949] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   54.023195] Stack:
[   54.025434]  0000000000000201 ffffffff836ca141 ffff8801d6c1fad0 ffffffff81237f0d
[   54.033432]  ffff8801d73d8500 ffff8801d73d8158 ffff8801d73d8558 ffff8801d73d8150
[   54.041427]  ffff8801d73d80b0 ffff8801d73d8520 0000000000000000 0000000000000000
[   54.049637] Call Trace:
[   54.052207]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   54.058332]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   54.064281]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   54.070403]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   54.076627]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   54.083185]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   54.088783]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   54.094534]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   54.101525]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   54.107742]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   54.113089]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   54.118522]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   54.124644]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   54.131287]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   54.137490] 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 
[   54.164747] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   54.171516]  RSP <ffff8801d6c1fab0>
[   54.175114] CR2: 0000000000000080
[   54.179028] ---[ end trace 6192eb1937baea7b ]---
[   54.183902] Kernel panic - not syncing: Fatal exception
[   54.190290] Dumping ftrace buffer:
[   54.193809]    (ftrace buffer empty)
[   54.197495] Kernel Offset: disabled
[   54.201099] Rebooting in 86400 seconds..