------------[ cut here ]------------
WARNING: CPU: 3 PID: 9317 at fs/nsfs.c:493 nsfs_fh_to_dentry+0x9de/0xe10 fs/nsfs.c:493
Modules linked in:
CPU: 3 UID: 0 PID: 9317 Comm: syz.4.932 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:nsfs_fh_to_dentry+0x9de/0xe10 fs/nsfs.c:493
Code: 50 51 ff e9 63 fe ff ff e8 9f 5a 75 ff 90 0f 0b 90 e9 7b f8 ff ff e8 91 5a 75 ff 90 0f 0b 90 e9 ce f8 ff ff e8 83 5a 75 ff 90 <0f> 0b 90 e9 32 f9 ff ff e8 75 5a 75 ff 49 8d 7d 10 48 b8 00 00 00
RSP: 0018:ffffc90003dd7b18 EFLAGS: 00010283
RAX: 0000000000000086 RBX: 0000000000000000 RCX: ffffc90004281000
RDX: 0000000000080000 RSI: ffffffff82452e2d RDI: 0000000000000004
RBP: ffff8880674e1988 R08: 0000000000000004 R09: 00000000effffff9
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff920007baf64
R13: ffffffff9acff158 R14: 00000000effffff9 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff888097f66000(0063) knlGS:00000000f541eb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080000000 CR3: 000000004fc52000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 exportfs_decode_fh_raw+0x164/0x7d0 fs/exportfs/expfs.c:456
 do_handle_to_path fs/fhandle.c:276 [inline]
 handle_to_path fs/fhandle.c:400 [inline]
 do_handle_open+0x702/0xc90 fs/fhandle.c:415
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x7c/0x300 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf702e579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f541e55c EFLAGS: 00000296 ORIG_RAX: 0000000000000156
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi