Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 8773 Comm: syz.3.771 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #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:pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
RIP: 0010:iter_file_splice_write+0xa4e/0x1150 fs/splice.c:754
Code: 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 1a 05 00 00 4d 8b 65 10 49 c7 45 10 00 00 00 00 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 ee 04 00 00 49 8b 54 24 08 4c 89 ee 4c 89 f7 83
RSP: 0018:ffffc9000d7e7918 EFLAGS: 00010202
RAX: 0000000000080000 RBX: dffffc0000000000 RCX: ffffc9000d811000
RDX: 0000000000000001 RSI: ffffffff82422536 RDI: 0000000000000008
RBP: 00000000000000de R08: 0000000000000006 R09: 0000000000000000
R10: 7fffffffffffefff R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807068d230 R14: ffff88805fe3f800 R15: 7fffffffffffefff
FS:  0000000000000000(0000) GS:ffff888097506000(0063) knlGS:00000000f5085b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000005717f4c0 CR3: 000000004411a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x18f/0x6c0 fs/splice.c:1158
 splice_direct_to_actor+0x342/0xa30 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x174/0x240 fs/splice.c:1227
 do_sendfile+0xb06/0xe50 fs/read_write.c:1370
 __do_compat_sys_sendfile fs/read_write.c:1452 [inline]
 __se_compat_sys_sendfile fs/read_write.c:1435 [inline]
 __ia32_compat_sys_sendfile+0x1e5/0x220 fs/read_write.c:1435
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x104/0x460 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:626
RIP: 0023:0xf7f84579
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:00000000f508555c EFLAGS: 00000296 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
RIP: 0010:iter_file_splice_write+0xa4e/0x1150 fs/splice.c:754
Code: 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 1a 05 00 00 4d 8b 65 10 49 c7 45 10 00 00 00 00 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 ee 04 00 00 49 8b 54 24 08 4c 89 ee 4c 89 f7 83
RSP: 0018:ffffc9000d7e7918 EFLAGS: 00010202
RAX: 0000000000080000 RBX: dffffc0000000000 RCX: ffffc9000d811000
RDX: 0000000000000001 RSI: ffffffff82422536 RDI: 0000000000000008
RBP: 00000000000000de R08: 0000000000000006 R09: 0000000000000000
R10: 7fffffffffffefff R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807068d230 R14: ffff88805fe3f800 R15: 7fffffffffffefff
FS:  0000000000000000(0000) GS:ffff888097506000(0063) knlGS:00000000f5085b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f71738a0 CR3: 000000004411a000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	00 48 89             	add    %cl,-0x77(%rax)
   3:	fa                   	cli
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1)
   c:	0f 85 1a 05 00 00    	jne    0x52c
  12:	4d 8b 65 10          	mov    0x10(%r13),%r12
  16:	49 c7 45 10 00 00 00 	movq   $0x0,0x10(%r13)
  1d:	00
  1e:	49 8d 7c 24 08       	lea    0x8(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1) <-- trapping instruction
  2e:	0f 85 ee 04 00 00    	jne    0x522
  34:	49 8b 54 24 08       	mov    0x8(%r12),%rdx
  39:	4c 89 ee             	mov    %r13,%rsi
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	83                   	.byte 0x83