[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.629648] 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: [ 25.676764] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.109868] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.933878] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 27.104062] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 32.497505] random: sshd: uninitialized urandom read (32 bytes read, 122 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 [ 32.622815] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 32.631084] IP: [] l2tp_session_create+0x93e/0x10f0 [ 32.637787] PGD 80000001d1f36067 PUD 1d1075067 PMD 0 [ 32.643370] Oops: 0002 [#1] PREEMPT SMP KASAN [ 32.648380] Dumping ftrace buffer: [ 32.651899] (ftrace buffer empty) [ 32.655592] Modules linked in: [ 32.658896] CPU: 0 PID: 3797 Comm: syzkaller382090 Not tainted 4.4.115-g55a366596 #14 [ 32.666847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.676189] task: ffff8801d8dde000 task.stack: ffff8801d8f40000 [ 32.682228] RIP: 0010:[] [] l2tp_session_create+0x93e/0x10f0 [ 32.691391] RSP: 0018:ffff8801d8f47b48 EFLAGS: 00010246 [ 32.696825] RAX: 0000000000000000 RBX: ffff8800b0644500 RCX: ffffffff834586e6 [ 32.704093] RDX: 1ffff100160c88d0 RSI: 0000000000000002 RDI: ffff8800b0644680 [ 32.711374] RBP: ffff8801d8f47bb8 R08: 000000000000000a R09: 000000000000ffff [ 32.718642] R10: ffffffff85700680 R11: ffffffff84418180 R12: ffff8800aba999a8 [ 32.725918] R13: ffff8801d8f47cd0 R14: ffff8800b06445e0 R15: ffff8800aba99900 [ 32.733177] FS: 00007f0cfde0e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.741916] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.747788] CR2: 0000000000000080 CR3: 00000001c884c000 CR4: 0000000000160670 [ 32.755057] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.762315] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.769578] Stack: [ 32.771714] ffffffff8113bd9a ffff8800b0644520 ffff8800aba99a58 ffff8801d8f47b78 [ 32.779790] ffff8800aba99910 0000000000000000 ffff8800aba999b0 ffff8800aba99a50 [ 32.787827] ffffffff00000000 0000000000000000 ffff8801d9943b80 0000000000000000 [ 32.795867] Call Trace: [ 32.798447] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 32.804760] [] pppol2tp_connect+0x10fc/0x1930 [ 32.810896] [] ? pppol2tp_recv+0x330/0x330 [ 32.816772] [] ? kasan_kmalloc+0xad/0xe0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.822474] [] ? __fget+0x20b/0x3b0 [ 32.827745] [] ? __might_fault+0xe4/0x1d0 [ 32.833540] [] ? check_stack_object+0x68/0x140 [ 32.839768] [] ? security_socket_connect+0x89/0xb0 [ 32.846347] [] SYSC_connect+0x1b6/0x310 [ 32.851963] [] ? SYSC_bind+0x280/0x280 [ 32.857496] [] ? __do_page_fault+0x290/0xa00 [ 32.863549] [] ? kvm_guest_cpu_init+0x200/0x230 [ 32.869863] [] ? up_read+0x1a/0x40 [ 32.875047] [] ? __do_page_fault+0x149/0xa00 [ 32.881099] [] ? move_addr_to_kernel+0x50/0x50 [ 32.887326] [] SyS_connect+0x24/0x30 [ 32.892688] [] entry_SYSCALL_64_fastpath+0x1c/0x98 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.899255] 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 [ 32.926695] RIP [] l2tp_session_create+0x93e/0x10f0 [ 32.933504] RSP [ 32.937117] CR2: 0000000000000080 [ 32.943804] ---[ end trace fcffb1edc6b67fd3 ]--- [ 32.949275] Kernel panic - not syncing: Fatal exception [ 32.955161] Dumping ftrace buffer: [ 32.958676] (ftrace buffer empty) [ 32.962360] Kernel Offset: disabled [ 32.965955] Rebooting in 86400 seconds..