[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.637103] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.229405] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.691072] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 23.594934] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 32.292019] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) Warning: Permanently added '10.128.15.224' (ECDSA) to the list of known hosts. [ 37.688891] random: sshd: uninitialized urandom read (32 bytes read, 115 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 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 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 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 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 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 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 [ 38.246285] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.254502] IP: [] l2tp_session_create+0x93e/0x10f0 [ 38.261176] PGD 80000001d0a86067 PUD 1d0a85067 PMD 0 [ 38.266684] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.271610] Dumping ftrace buffer: [ 38.275120] (ftrace buffer empty) [ 38.278802] Modules linked in: [ 38.282081] CPU: 0 PID: 3336 Comm: syzkaller603077 Not tainted 4.4.112-g3fc4284 #32 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 [ 38.289942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.299270] task: ffff8800b4bd4740 task.stack: ffff8801d0148000 [ 38.305294] RIP: 0010:[] [] l2tp_session_create+0x93e/0x10f0 [ 38.314402] RSP: 0018:ffff8801d014fb48 EFLAGS: 00010246 [ 38.319821] RAX: 0000000000000000 RBX: ffff8800b33cf680 RCX: ffffffff8345a3e6 [ 38.327062] RDX: 1ffff10016679f00 RSI: 0000000000000002 RDI: ffff8800b33cf800 [ 38.334306] RBP: ffff8801d014fbb8 R08: ffff8800b33cfc10 R09: 0000000000000000 [ 38.341642] R10: ffffffff856fe600 R11: ffffffff84417100 R12: ffff8800b33cfc28 [ 38.348881] R13: ffff8801d014fcd0 R14: ffff8800b33cf760 R15: ffff8800b33cfb80 [ 38.356123] FS: 00007ffb55aef700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.364318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.370168] CR2: 0000000000000080 CR3: 00000001d002a000 CR4: 0000000000160670 [ 38.377417] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.384655] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.391894] Stack: [ 38.394012] ffffffff8113bd0a ffff8800b33cf6a0 ffff8800b33cfcd8 ffff8801d014fb78 [ 38.401981] ffff8800b33cfb90 0000000000000000 ffff8800b33cfc30 ffff8800b33cfcd0 [ 38.409956] ffffffff00000000 0000000000000000 ffff8800b3bedd80 0000000000000000 [ 38.417916] Call Trace: [ 38.420476] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 38.426774] [] pppol2tp_connect+0x10fc/0x1930 [ 38.432885] [] ? pppol2tp_recv+0x330/0x330 [ 38.438737] [] ? __might_fault+0xe4/0x1d0 [ 38.444503] [] ? check_stack_object+0x68/0x140 [ 38.450710] [] ? security_socket_connect+0x89/0xb0 [ 38.457257] [] SYSC_connect+0x1b6/0x310 [ 38.462847] [] ? SYSC_bind+0x280/0x280 [ 38.468352] [] ? memset+0x31/0x40 [ 38.473421] [] ? kvm_guest_cpu_init+0x210/0x230 [ 38.479711] [] ? retint_user+0x18/0x3c [ 38.485221] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 38.492037] [] SyS_connect+0x24/0x30 executing program [ 38.497369] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 38.503912] 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 3b 4b [ 38.530419] RIP [] l2tp_session_create+0x93e/0x10f0 [ 38.537172] RSP [ 38.540762] CR2: 0000000000000080 executing program [ 38.545744] ---[ end trace 07d9d8ef3b8416ab ]--- [ 38.550620] Kernel panic - not syncing: Fatal exception [ 38.556317] Dumping ftrace buffer: [ 38.559829] (ftrace buffer empty) [ 38.563511] Kernel Offset: disabled [ 38.567107] Rebooting in 86400 seconds..