[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   12.908923] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   17.210364] random: sshd: uninitialized urandom read (32 bytes read)
[   17.738173] random: sshd: uninitialized urandom read (32 bytes read)
[   18.267147] random: sshd: uninitialized urandom read (32 bytes read)
[   50.392081] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts.
[   55.903196] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/23 13:23:21 parsed 1 programs
[   57.417429] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/23 13:23:24 executed programs: 0
[   58.555733] IPVS: Creating netns size=2536 id=1
[   58.687263] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   58.698727] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   58.742818] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   58.754865] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   58.801314] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   58.812490] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   58.824691] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   58.845846] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   59.377782] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   59.404168] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   59.410390] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   59.417540] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   59.625265] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   59.640319] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   59.652083] hrtimer: interrupt took 16361 ns
[   59.749525] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   59.757887] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   59.764703] PGD 1da3fb067 [   59.767368] PUD 1b5187067 
PMD 0 [   59.770883] 
[   59.772521] Oops: 0002 [#1] PREEMPT SMP KASAN
[   59.777009] Dumping ftrace buffer:
[   59.780669]    (ftrace buffer empty)
[   59.784373] Modules linked in:
[   59.787687] CPU: 1 PID: 4252 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   59.795571] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.804921] task: ffff8801d4f09800 task.stack: ffff8801d4578000
[   59.811280] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   59.820769] RSP: 0018:ffff8801d457fab0  EFLAGS: 00010246
[   59.826496] RAX: 0000000000000000 RBX: ffff8801da347180 RCX: 1ffff1003a9e141d
[   59.833770] RDX: 1ffff1003b468dc0 RSI: ffff8801d4f0a0c8 RDI: ffff8801da346e00
[   59.841029] RBP: ffff8801d457fb50 R08: ffff8801d4f0a0e8 R09: 0000000000000000
[   59.848275] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da346cd8
[   59.855524] R13: 0000000000000000 R14: ffff8801da346c80 R15: ffff8801d457fc68
[   59.862877] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7710b40
[   59.871095] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   59.876955] CR2: 0000000000000080 CR3: 00000001da1da000 CR4: 00000000001606f0
[   59.884209] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   59.891455] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   59.898744] Stack:
[   59.901002]  0000000000000201 ffffffff836ca141 ffff8801d457fad0 ffffffff81237f0d
[   59.909002]  ffff8801da346c80 ffff8801da3472d8 ffff8801da346cd8 ffff8801da3472d0
[   59.916998]  ffff8801da347230 ffff8801da346ca0 0000000000000000 0000000000000000
[   59.925069] Call Trace:
[   59.927723]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   59.933853]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   59.939804]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   59.945927]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   59.952238]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   59.958796]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   59.964397]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   59.969913]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   59.976909]  [<ffffffff83020830>] ? move_addr_to_kernel+0x50/0x50
[   59.983240]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   59.988591]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   59.994031]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   60.000149]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   60.006960]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   60.013210] 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 
[   60.040177] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   60.046947]  RSP <ffff8801d457fab0>
[   60.050545] CR2: 0000000000000080
[   60.054566] ---[ end trace 9c7a1d58c44614aa ]---
[   60.059309] Kernel panic - not syncing: Fatal exception
[   60.065132] Dumping ftrace buffer:
[   60.068649]    (ftrace buffer empty)
[   60.072336] Kernel Offset: disabled
[   60.075942] Rebooting in 86400 seconds..