RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
CPU: 2 UID: 0 PID: 7099 Comm: syz.4.305 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc90002d77720 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cdbfa9 RDI: 00000000000000ad
RBP: ffff888021e562a0 R08: 00000000ffffffff R09: fffffbfff1dff57e
R10: ffffffff8effabf3 R11: 0000000000000001 R12: ffff888021e561c0
R13: ffff888021e56378 R14: 0000000000000000 R15: ffff888021e562f2
FS:  0000000000000000(0000) GS:ffff888096b82000(0063) knlGS:00000000f545db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f706f000 CR3: 000000005d9b2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111
 netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290
 netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382
 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409
 iter_file_splice_write+0x830/0x10b0 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x192/0x690 fs/splice.c:1159
 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x174/0x240 fs/splice.c:1228
 do_sendfile+0xadc/0xe20 fs/read_write.c:1371
 __do_compat_sys_sendfile fs/read_write.c:1453 [inline]
 __se_compat_sys_sendfile fs/read_write.c:1436 [inline]
 __ia32_compat_sys_sendfile+0x1e5/0x220 fs/read_write.c:1436
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf706efec
Code: Unable to access opcode bytes at 0xf706efc2.
RSP: 002b:00000000f545d50c EFLAGS: 00000292 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 000000000000000c
RDX: 0000000000000000 RSI: 0000000000000023 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173
Code: e1 07 38 ca 7f 08 84 d2 0f 85 04 06 00 00 48 8d bb ad 00 00 00 0f b6 45 52 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 c1 05 00 00
RSP: 0018:ffffc90002d77720 EFLAGS: 00010203
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000015
RDX: dffffc0000000000 RSI: ffffffff82cdbfa9 RDI: 00000000000000ad
RBP: ffff888021e562a0 R08: 00000000ffffffff R09: fffffbfff1dff57e
R10: ffffffff8effabf3 R11: 0000000000000001 R12: ffff888021e561c0
R13: ffff888021e56378 R14: 0000000000000000 R15: ffff888021e562f2
FS:  0000000000000000(0000) GS:ffff888096b82000(0063) knlGS:00000000f545db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f706f000 CR3: 000000005d9b2000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e1 07                	loope  0x9
   2:	38 ca                	cmp    %cl,%dl
   4:	7f 08                	jg     0xe
   6:	84 d2                	test   %dl,%dl
   8:	0f 85 04 06 00 00    	jne    0x612
   e:	48 8d bb ad 00 00 00 	lea    0xad(%rbx),%rdi
  15:	0f b6 45 52          	movzbl 0x52(%rbp),%eax
  19:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  20:	fc ff df
  23:	48 89 f9             	mov    %rdi,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	0f b6 14 11          	movzbl (%rcx,%rdx,1),%edx <-- trapping instruction
  2e:	48 89 f9             	mov    %rdi,%rcx
  31:	83 e1 07             	and    $0x7,%ecx
  34:	38 ca                	cmp    %cl,%dl
  36:	7f 08                	jg     0x40
  38:	84 d2                	test   %dl,%dl
  3a:	0f 85 c1 05 00 00    	jne    0x601