kasan: GPF could be caused by NULL-ptr deref or user memory access
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
general protection fault: 0000 [#1] PREEMPT SMP KASAN
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
Modules linked in:
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f03408da73a
CPU: 0 PID: 2704 Comm: syz-executor.2 Not tainted 4.14.290-syzkaller #0
RSP: 002b:00007f033f24df88 EFLAGS: 00000206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
 ORIG_RAX: 00000000000000a5
task: ffff88809e6a8380 task.stack: ffff88808c580000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f03408da73a
RIP: 0010:vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline]
RIP: 0010:vhost_del_umem_range drivers/vhost/vhost.c:977 [inline]
RIP: 0010:vhost_process_iotlb_msg drivers/vhost/vhost.c:1048 [inline]
RIP: 0010:vhost_chr_write_iter drivers/vhost/vhost.c:1077 [inline]
RIP: 0010:vhost_chr_write_iter+0x873/0x1100 drivers/vhost/vhost.c:1061
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 0000000000000000
RSP: 0018:ffff88808c587c00 EFLAGS: 00010246
RBP: 00007f033f24e020 R08: 00007f033f24e020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
RAX: dffffc0000000000 RBX: ffff88808eee4700 RCX: 0000000000000000
R13: 0000000020000040 R14: 00007f033f24dfe0 R15: 0000000020000500
RDX: 0000000000000002 RSI: ffffffff857e4e65 RDI: ffff88808eee47c0
RBP: ffffed1011ddc8f1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: ffff88809e6a8380 R12: 0000000000000002
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff110118b0f87
FS:  00007f4798140700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b545a0000 CR3: 00000000a03da000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 call_write_iter include/linux/fs.h:1780 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f47997cb209
RSP: 002b:00007f4798140168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f47998ddf60 RCX: 00007f47997cb209
RDX: 0000000000000048 RSI: 0000000020002180 RDI: 0000000000000006
RBP: 00007f4799825161 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe760bc72f R14: 00007f4798140300 R15: 0000000000022000
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 
CPU: 1 PID: 2718 Comm: syz-executor.0 Not tainted 4.14.290-syzkaller #0
RIP: vhost_umem_interval_tree_iter_first drivers/vhost/vhost.c:53 [inline] RSP: ffff88808c587c00
RIP: vhost_del_umem_range drivers/vhost/vhost.c:977 [inline] RSP: ffff88808c587c00
RIP: vhost_process_iotlb_msg drivers/vhost/vhost.c:1048 [inline] RSP: ffff88808c587c00
RIP: vhost_chr_write_iter drivers/vhost/vhost.c:1077 [inline] RSP: ffff88808c587c00
RIP: vhost_chr_write_iter+0x873/0x1100 drivers/vhost/vhost.c:1061 RSP: ffff88808c587c00
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
---[ end trace 2510103bc9711530 ]---
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	f9                   	stc
   4:	48 c1 e9 03          	shr    $0x3,%rcx
   8:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
   c:	0f 85 c6 06 00 00    	jne    0x6d8
  12:	4c 8b ab c0 00 00 00 	mov    0xc0(%rbx),%r13
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 e9             	mov    %r13,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1) <-- trapping instruction
  2e:	0f 85 8f 06 00 00    	jne    0x6c3
  34:	49 8b 6d 00          	mov    0x0(%r13),%rbp
  38:	48 85 ed             	test   %rbp,%rbp
  3b:	0f                   	.byte 0xf
  3c:	84 e4                	test   %ah,%ah
  3e:	03                   	.byte 0x3