[ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.367991] kasan: CONFIG_KASAN_INLINE enabled [ 27.372844] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.380189] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.386393] Modules linked in: [ 27.390291] CPU: 0 PID: 7950 Comm: syz-executor352 Not tainted 4.14.284-syzkaller #0 [ 27.398143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.407481] task: ffff8880984726c0 task.stack: ffff8880b34f0000 [ 27.413525] RIP: 0010:vhost_chr_write_iter+0x873/0x1100 [ 27.418855] RSP: 0018:ffff8880b34f7c00 EFLAGS: 00010246 [ 27.424201] RAX: dffffc0000000000 RBX: ffff888092320140 RCX: 0000000000000000 [ 27.431442] RDX: 0000000000000002 RSI: ffffffff8ba61dd0 RDI: ffff888092320200 [ 27.438688] RBP: ffffed1012464039 R08: 0000000000000000 R09: 0000000000000000 [ 27.445933] R10: 0000000000000002 R11: ffff8880984726c0 R12: 0000000000000002 [ 27.453173] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff1101669ef87 [ 27.460420] FS: 000055555661d300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 27.468616] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.474556] CR2: 000000002000000e CR3: 00000000a0788000 CR4: 00000000003406f0 [ 27.481802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.489052] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.496302] Call Trace: [ 27.498867] ? log_write_hva+0x310/0x310 [ 27.502911] ? debug_check_no_obj_freed+0x2c0/0x680 [ 27.508084] ? lock_downgrade+0x740/0x740 [ 27.512203] ? iov_iter_init+0xa6/0x1c0 [ 27.516166] __vfs_write+0x44c/0x630 [ 27.519851] ? kernel_read+0x110/0x110 [ 27.523713] ? rw_verify_area+0xe1/0x2a0 [ 27.527753] vfs_write+0x17f/0x4d0 [ 27.531266] SyS_write+0xf2/0x210 [ 27.534690] ? SyS_read+0x210/0x210 [ 27.538322] ? __do_page_fault+0x159/0xad0 [ 27.542635] ? do_syscall_64+0x4c/0x640 [ 27.546591] ? SyS_read+0x210/0x210 [ 27.550189] do_syscall_64+0x1d5/0x640 [ 27.554054] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.559216] RIP: 0033:0x7feede7ae029 [ 27.562905] RSP: 002b:00007ffd6f44a8c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 27.570584] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007feede7ae029 [ 27.577827] RDX: 0000000000000048 RSI: 0000000020000180 RDI: 0000000000000003 [ 27.585066] RBP: 00007feede772010 R08: 0000000000000000 R09: 0000000000000000 [ 27.592307] R10: 0000000000000000 R11: 0000000000000246 R12: 00007feede7720a0 [ 27.599554] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.606796] Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 c6 06 00 00 4c 8b ab c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e9 48 c1 e9 03 <80> 3c 01 00 0f 85 8f 06 00 00 49 8b 6d 00 48 85 ed 0f 84 e4 03 [ 27.625868] RIP: vhost_chr_write_iter+0x873/0x1100 RSP: ffff8880b34f7c00 [ 27.634760] ---[ end trace 3cd77bd822fd029b ]--- [ 27.639516] Kernel panic - not syncing: Fatal exception [ 27.644946] Kernel Offset: disabled [ 27.648558] Rebooting in 86400 seconds..