[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   13.368248] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.276322] random: sshd: uninitialized urandom read (32 bytes read)
[   24.858802] random: sshd: uninitialized urandom read (32 bytes read)
[   25.368790] random: sshd: uninitialized urandom read (32 bytes read)
[   36.606536] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts.
[   42.096864] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 18:47:19 parsed 1 programs
[   43.871538] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 18:47:22 executed programs: 0
[   45.756141] IPVS: Creating netns size=2536 id=1
[   45.878343] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   45.889601] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   45.933643] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   45.944827] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   45.988186] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   45.999491] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   46.011112] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   46.031711] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   46.530059] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   46.554533] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   46.560723] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   46.568211] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
2018/08/22 18:47:27 executed programs: 562
[   50.753641] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   50.761881] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   50.768569] PGD 1d48aa067 [   50.771210] PUD 1d785d067 
PMD 0 [   50.774681] 
[   50.776299] Oops: 0002 [#1] PREEMPT SMP KASAN
[   50.780767] Dumping ftrace buffer:
[   50.784278]    (ftrace buffer empty)
[   50.787962] Modules linked in:
[   50.791260] CPU: 1 PID: 6239 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31
[   50.798874] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   50.808200] task: ffff8801b5fcc800 task.stack: ffff8801d31b8000
[   50.814226] RIP: 0010:[<ffffffff836c8e30>]  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   50.823362] RSP: 0018:ffff8801d31bfab0  EFLAGS: 00010246
[   50.828781] RAX: 0000000000000000 RBX: ffff8801d37ca000 RCX: 1ffff10036bf9a1d
[   50.836022] RDX: 1ffff1003a6f94d0 RSI: ffff8801b5fcd0c8 RDI: ffff8801d37ca680
[   50.843266] RBP: ffff8801d31bfb50 R08: ffff8801b5fcd0e8 R09: 0000000000000000
[   50.850506] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d37ca558
[   50.857752] R13: 0000000000000000 R14: ffff8801d37ca500 R15: ffff8801d31bfc68
[   50.864994] FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77e7b40
[   50.873210] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   50.879065] CR2: 0000000000000080 CR3: 00000001ca25d000 CR4: 00000000001606f0
[   50.886342] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   50.893591] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   50.900838] Stack:
[   50.902975]  0000000000000201 ffffffff836ca141 ffff8801d31bfad0 ffffffff81237f0d
[   50.910959]  ffff8801d37ca500 ffff8801d37ca158 ffff8801d37ca558 ffff8801d37ca150
[   50.918943]  ffff8801d37ca0b0 ffff8801d37ca520 0000000000000000 0000000000000000
[   50.926943] Call Trace:
[   50.929502]  [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790
[   50.935623]  [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10
[   50.941593]  [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0
[   50.947711]  [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30
[   50.953920]  [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0
[   50.960470]  [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300
[   50.966069]  [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280
[   50.971588]  [<ffffffff815dbcb0>] ? get_unused_fd_flags+0xd0/0xd0
[   50.977795]  [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310
[   50.984778]  [<ffffffff815da451>] ? __fget+0x231/0x3b0
[   50.990038]  [<ffffffff815da267>] ? __fget+0x47/0x3b0
[   50.995199]  [<ffffffff83021224>] SyS_connect+0x24/0x30
[   51.000536]  [<ffffffff83021200>] ? SyS_accept+0x30/0x30
[   51.005984]  [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870
[   51.012120]  [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c
[   51.018769]  [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2
[   51.024968] 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 
[   51.051911] RIP  [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0
[   51.058674]  RSP <ffff8801d31bfab0>
[   51.062283] CR2: 0000000000000080
[   51.066255] ---[ end trace 89c0d79865eae654 ]---
[   51.071064] Kernel panic - not syncing: Fatal exception
[   51.076756] Dumping ftrace buffer:
[   51.080274]    (ftrace buffer empty)
[   51.083954] Kernel Offset: disabled
[   51.087552] Rebooting in 86400 seconds..