[ 14.975452] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.475719] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 19.750601] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.671370] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 20.849385] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 26.237543] random: sshd: uninitialized urandom read (32 bytes read, 119 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 [ 27.388639] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 27.396865] IP: [] l2tp_session_create+0x93e/0x10f0 [ 27.403535] PGD 80000000b4a51067 PUD b3f4e067 PMD 0 [ 27.408956] Oops: 0002 [#1] PREEMPT SMP KASAN [ 27.413877] Dumping ftrace buffer: [ 27.417385] (ftrace buffer empty) [ 27.421064] Modules linked in: [ 27.424338] CPU: 0 PID: 4069 Comm: syzkaller410128 Not tainted 4.4.113-gef588ef #33 [ 27.432102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.441425] task: ffff8800b34097c0 task.stack: ffff8800b39e8000 [ 27.447448] RIP: 0010:[] [] l2tp_session_create+0x93e/0x10f0 [ 27.456547] RSP: 0018:ffff8800b39efb48 EFLAGS: 00010246 [ 27.461964] RAX: 0000000000000000 RBX: ffff8800b3f20c80 RCX: ffffffff83455d76 [ 27.469204] RDX: 1ffff100167e41c0 RSI: 0000000000000002 RDI: ffff8800b3f20e00 [ 27.476444] RBP: ffff8800b39efbb8 R08: 000000000000000a R09: 0000000000000000 [ 27.483683] R10: ffffffff85700640 R11: ffffffff84418100 R12: ffff8800b3f20fa8 [ 27.490920] R13: ffff8800b39efcd0 R14: ffff8800b3f20d60 R15: ffff8800b3f20f00 [ 27.498159] FS: 00007fc40534b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.506353] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.512204] CR2: 0000000000000080 CR3: 00000000b386a000 CR4: 0000000000160670 [ 27.519445] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.526688] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.533927] Stack: [ 27.536046] ffffffff8113bd8a ffff8800b3f20ca0 ffff8800b3f21058 ffff8800b39efb78 [ 27.544018] ffff8800b3f20f10 0000000000000000 ffff8800b3f20fb0 ffff8800b3f21050 [ 27.551993] 03d15af300000000 0000000000000000 ffff8800b341b300 0000000000000000 [ 27.559962] Call Trace: [ 27.562522] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 27.568821] [] pppol2tp_connect+0x10fc/0x1930 [ 27.574947] [] ? pppol2tp_recv+0x330/0x330 [ 27.580817] [] ? __might_fault+0xe4/0x1d0 [ 27.586592] [] ? check_stack_object+0x68/0x140 [ 27.592805] [] ? security_socket_connect+0x89/0xb0 [ 27.599357] [] SYSC_connect+0x1b6/0x310 [ 27.604953] [] ? SYSC_bind+0x280/0x280 [ 27.610463] [] ? memset+0x31/0x40 [ 27.615540] [] ? kvm_guest_cpu_init+0x200/0x230 [ 27.621836] [] ? retint_user+0x18/0x3c [ 27.627344] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.634156] [] SyS_connect+0x24/0x30 [ 27.639491] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 27.646037] 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 1b 4b [ 27.672604] RIP [] l2tp_session_create+0x93e/0x10f0 [ 27.679362] RSP [ 27.682955] CR2: 0000000000000080 [ 27.689629] ---[ end trace 4107a2e5929ec996 ]--- [ 27.694383] Kernel panic - not syncing: Fatal exception [ 27.700167] Dumping ftrace buffer: [ 27.703679] (ftrace buffer empty) [ 27.707358] Kernel Offset: disabled [ 27.710951] Rebooting in 86400 seconds..