[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.132924] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.312694] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.623825] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.434010] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 22.592998] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 27.994528] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.362917] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 28.371140] IP: [] l2tp_session_create+0x93e/0x10f0 [ 28.377817] PGD 80000001d01c9067 PUD 1d01ca067 PMD 0 [ 28.383326] Oops: 0002 [#1] PREEMPT SMP KASAN [ 28.388293] Dumping ftrace buffer: [ 28.391800] (ftrace buffer empty) [ 28.395479] Modules linked in: [ 28.398759] CPU: 1 PID: 3825 Comm: syzkaller490431 Not tainted 4.4.115-g55a366596 #15 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.406700] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.416024] task: ffff8801cb1b6000 task.stack: ffff8801cc7e8000 [ 28.422050] RIP: 0010:[] [] l2tp_session_create+0x93e/0x10f0 [ 28.431151] RSP: 0018:ffff8801cc7efad0 EFLAGS: 00010246 [ 28.436569] RAX: 0000000000000000 RBX: ffff8801d141d680 RCX: ffffffff834586e6 [ 28.443810] RDX: 1ffff1003a283b00 RSI: 0000000000000002 RDI: ffff8801d141d800 [ 28.451053] RBP: ffff8801cc7efb40 R08: 000000000000000a R09: 000000000000ffff executing program executing program executing program executing program executing program executing program executing program [ 28.458301] R10: ffffffff85700680 R11: ffffffff84418180 R12: ffff8800b02d6828 [ 28.465541] R13: ffff8801cc7efc58 R14: ffff8801d141d760 R15: ffff8800b02d6780 [ 28.472782] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7785b40 [ 28.480977] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.486828] CR2: 0000000000000080 CR3: 00000001d2370000 CR4: 0000000000160670 [ 28.494071] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.501313] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.508552] Stack: executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.510668] ffffffff8113bd9a ffff8801d141d6a0 ffff8800b02d68d8 ffff8801cc7efb00 [ 28.518650] ffff8800b02d6790 0000000000000000 ffff8800b02d6830 ffff8800b02d68d0 [ 28.526612] ffffffff00000000 0000000000000000 ffff8801cb15bb80 0000000000000000 [ 28.534573] Call Trace: [ 28.537149] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 28.543446] [] pppol2tp_connect+0x10fc/0x1930 [ 28.549560] [] ? pppol2tp_recv+0x330/0x330 [ 28.555415] [] ? kasan_kmalloc+0xad/0xe0 executing program executing program executing program executing program executing program executing program executing program executing program [ 28.561097] [] ? __fget+0x20b/0x3b0 [ 28.566342] [] ? __might_fault+0xe4/0x1d0 [ 28.572119] [] ? check_stack_object+0x68/0x140 [ 28.578324] [] ? security_socket_connect+0x89/0xb0 [ 28.584880] [] SYSC_connect+0x1b6/0x310 [ 28.590482] [] ? SYSC_bind+0x280/0x280 [ 28.595991] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.602105] [] ? __alloc_fd+0x1e3/0x500 [ 28.607700] [] ? __do_page_fault+0x290/0xa00 executing program executing program executing program executing program executing program executing program executing program [ 28.613730] [] ? vmacache_update+0xfe/0x130 [ 28.619678] [] ? __do_page_fault+0x380/0xa00 [ 28.625708] [] SyS_connect+0x24/0x30 [ 28.631040] [] ? SyS_accept+0x30/0x30 [ 28.636471] [] do_fast_syscall_32+0x314/0x890 [ 28.642584] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program [ 28.648617] Code: 00 00 48 8d bb 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 4f 07 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b8 e8 4b 4b [ 28.675217] RIP [] l2tp_session_create+0x93e/0x10f0 [ 28.681975] RSP [ 28.685573] CR2: 0000000000000080 [ 28.698266] ---[ end trace b41c6987e30e555d ]--- [ 28.703077] Kernel panic - not syncing: Fatal exception [ 28.708779] Dumping ftrace buffer: [ 28.712294] (ftrace buffer empty) [ 28.715972] Kernel Offset: disabled [ 28.719568] Rebooting in 86400 seconds..