[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.129544] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?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..