Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 6132 Comm: syz.0.17 Not tainted 6.14.0-syzkaller-13381-g4a1d8ababde6 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
RIP: 0010:iter_file_splice_write+0xe1f/0x1530 fs/splice.c:754
Code: 80 3c 06 00 74 08 4c 89 ff e8 2d 1d de ff 49 c7 07 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 80 3c 38 00 44 8b b4 24 b0 00 00 00 74 08 48 89 df e8 0a 1c de
RSP: 0018:ffffc9000369f7a0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000000
RDX: ffff888035a4900c RSI: 0000000000000000 RDI: 7ffffffffffeffff
RBP: ffffc9000369fa30 R08: ffffffff824cc294 R09: 1ffff1100cf2f0e9
R10: dffffc0000000000 R11: ffffffff820717e0 R12: 0000000000000000
R13: 7ffffffffffeffff R14: 1ffff11006b49202 R15: dffffc0000000000
FS:  00007ffa084206c0(0000) GS:ffff8881250cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001900 CR3: 0000000033022000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x11b/0x220 fs/splice.c:1158
 splice_direct_to_actor+0x595/0xc90 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x281/0x3d0 fs/splice.c:1227
 do_sendfile+0x582/0x8c0 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64+0x17e/0x1e0 fs/read_write.c:1415
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa07585d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa08420038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffa07775fa0 RCX: 00007ffa07585d29
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007ffa07601b08 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffa07775fa0 R15: 00007ffe0a5ba158
 </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+0xe1f/0x1530 fs/splice.c:754
Code: 80 3c 06 00 74 08 4c 89 ff e8 2d 1d de ff 49 c7 07 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df <42> 80 3c 38 00 44 8b b4 24 b0 00 00 00 74 08 48 89 df e8 0a 1c de
RSP: 0018:ffffc9000369f7a0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: 0000000000000000
RDX: ffff888035a4900c RSI: 0000000000000000 RDI: 7ffffffffffeffff
RBP: ffffc9000369fa30 R08: ffffffff824cc294 R09: 1ffff1100cf2f0e9
R10: dffffc0000000000 R11: ffffffff820717e0 R12: 0000000000000000
R13: 7ffffffffffeffff R14: 1ffff11006b49202 R15: dffffc0000000000
FS:  00007ffa084206c0(0000) GS:ffff888124fcc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f5ffff CR3: 0000000033022000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	80 3c 06 00          	cmpb   $0x0,(%rsi,%rax,1)
   4:	74 08                	je     0xe
   6:	4c 89 ff             	mov    %r15,%rdi
   9:	e8 2d 1d de ff       	call   0xffde1d3b
   e:	49 c7 07 00 00 00 00 	movq   $0x0,(%r15)
  15:	48 83 c3 08          	add    $0x8,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  27:	fc ff df
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	44 8b b4 24 b0 00 00 	mov    0xb0(%rsp),%r14d
  36:	00
  37:	74 08                	je     0x41
  39:	48 89 df             	mov    %rbx,%rdi
  3c:	e8                   	.byte 0xe8
  3d:	0a 1c de             	or     (%rsi,%rbx,8),%bl