[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   14.841281] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   27.392756] random: sshd: uninitialized urandom read (32 bytes read)
[   27.959892] random: sshd: uninitialized urandom read (32 bytes read)
[   28.483683] random: sshd: uninitialized urandom read (32 bytes read)
[   28.608224] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts.
[   34.285936] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 15:02:29 parsed 1 programs
[   36.173058] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 15:02:33 executed programs: 0
[   38.069284] IPVS: Creating netns size=2536 id=1
[   38.193190] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   38.205162] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   38.248098] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   38.259311] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   38.303011] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   38.314683] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   38.327396] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   38.348090] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   38.847264] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   38.871949] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   38.878166] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   38.885398] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   39.101161] hrtimer: interrupt took 13661 ns
[   39.249503] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   39.424526] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   39.432856] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   39.439540] PGD 1d383b067 [   39.442182] PUD 1d3ace067 
PMD 0 [   39.445656] 
[   39.447274] Oops: 0002 [#1] PREEMPT SMP KASAN
[   39.451794] Dumping ftrace buffer:
[   39.455311]    (ftrace buffer empty)
[   39.458993] Modules linked in:
[   39.462317] CPU: 0 PID: 4385 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   39.469911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.479240] task: ffff8801d37e6000 task.stack: ffff8801d3208000
[   39.485267] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   39.494380] RSP: 0018:ffff8801d320fab0  EFLAGS: 00010246
[   39.499802] RAX: 0000000000000000 RBX: ffff8801d3761b80 RCX: 1ffff1003a6fcd1d
[   39.507046] RDX: 1ffff1003a707080 RSI: ffff8801d37e68c8 RDI: ffff8801d3838400
[   39.514288] RBP: ffff8801d320fb50 R08: ffff8801d37e68e8 R09: 0000000000000000
[   39.521575] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d38382d8
[   39.528826] R13: 0000000000000000 R14: ffff8801d3838280 R15: ffff8801d320fc68
[   39.536080] FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7752b40
[   39.544740] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   39.550599] CR2: 0000000000000080 CR3: 00000001d319a000 CR4: 00000000001606f0
[   39.557855] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   39.565106] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   39.572345] Stack:
[   39.574470]  0000000000000201 ffffffff836ca141 ffff8801d320fad0 ffffffff81237f0d
[   39.582502]  ffff8801d3838280 ffff8801d3761cd8 ffff8801d38382d8 ffff8801d3761cd0
[   39.590499]  ffff8801d3761c30 ffff8801d38382a0 0000000000000000 0000000000000000
[   39.598474] Call Trace:
[   39.601040]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   39.607159]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   39.613103]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   39.619289]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   39.625505]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   39.632058]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   39.637655]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   39.643165]  [<ffffffff81f2110b>] ? check_preemption_disabled+0x3b/0x170
[   39.649981]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   39.656967]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   39.663176]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   39.668514]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   39.673941]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   39.680165]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   39.686816]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   39.693066] 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 
[   39.720126] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   39.726890]  RSP <ffff8801d320fab0>
[   39.730553] CR2: 0000000000000080
[   39.735010] ---[ end trace 8fc9f61e0b81ccaf ]---
[   39.739795] Kernel panic - not syncing: Fatal exception
[   39.745520] Dumping ftrace buffer:
[   39.749031]    (ftrace buffer empty)
[   39.752799] Kernel Offset: disabled
[   39.756405] Rebooting in 86400 seconds..