[ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.178' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.024678] kasan: CONFIG_KASAN_INLINE enabled [ 28.029327] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.036937] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.043158] Modules linked in: [ 28.046331] CPU: 0 PID: 7973 Comm: syz-executor847 Not tainted 4.14.218-syzkaller #0 [ 28.054182] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.063614] task: ffff8880b36fc380 task.stack: ffff88808cde8000 [ 28.069650] RIP: 0010:vhost_chr_write_iter+0x863/0x10f0 [ 28.074985] RSP: 0018:ffff88808cdefc00 EFLAGS: 00010246 [ 28.080471] RAX: dffffc0000000000 RBX: ffff888091420140 RCX: 0000000000000000 [ 28.087725] RDX: 0000000000000002 RSI: ffffffff8ba43d90 RDI: ffff888091420200 [ 28.094976] RBP: ffffed1012284039 R08: 0000000000000000 R09: 0000000000000000 [ 28.102261] R10: 0000000000000002 R11: ffff8880b36fc380 R12: 0000000000000002 [ 28.109511] R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff110119bdf87 [ 28.116832] FS: 0000000000787300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 28.125097] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.130954] CR2: 00000000004ae0f0 CR3: 00000000acb7d000 CR4: 00000000001406f0 [ 28.138209] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.145495] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.152745] Call Trace: [ 28.155316] ? log_write_hva+0x310/0x310 [ 28.159386] ? __handle_mm_fault+0x129c/0x4620 [ 28.163948] ? finish_mkwrite_fault+0x5e0/0x5e0 [ 28.168593] ? iov_iter_init+0xa6/0x1c0 [ 28.172561] __vfs_write+0x44c/0x630 [ 28.176252] ? __handle_mm_fault+0x80f/0x4620 [ 28.180721] ? kernel_read+0x110/0x110 [ 28.184586] ? rw_verify_area+0xe1/0x2a0 [ 28.188624] vfs_write+0x17f/0x4d0 [ 28.192140] SyS_write+0xf2/0x210 [ 28.195569] ? SyS_read+0x210/0x210 [ 28.199172] ? __do_page_fault+0x159/0xad0 [ 28.203382] ? do_syscall_64+0x4c/0x640 [ 28.207330] ? SyS_read+0x210/0x210 [ 28.210950] do_syscall_64+0x1d5/0x640 [ 28.214818] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.219988] RIP: 0033:0x43fcc9 [ 28.223155] RSP: 002b:00007ffe9547c2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 28.230840] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043fcc9 [ 28.238085] RDX: 0000000000000048 RSI: 0000000020000480 RDI: 0000000000000003 [ 28.245329] RBP: 0000000000000000 R08: 00007ffe9547c498 R09: 00007ffe9547c498 [ 28.252574] R10: 00007ffe9547c498 R11: 0000000000000246 R12: 0000000000403550 [ 28.259818] R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488 [ 28.267068] Code: ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 cd 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 96 06 00 00 49 8b 6d 00 48 85 ed 0f 84 e4 03 [ 28.286132] RIP: vhost_chr_write_iter+0x863/0x10f0 RSP: ffff88808cdefc00 [ 28.295012] ---[ end trace cda082309625abfb ]--- [ 28.299774] Kernel panic - not syncing: Fatal exception [ 28.305952] Kernel Offset: disabled [ 28.309586] Rebooting in 86400 seconds..