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: 21956 Comm: syz.6.5085 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
RIP: 0010:iter_file_splice_write+0xa9b/0x1000 fs/splice.c:754
Code: 00 74 08 4c 89 f7 e8 14 5b e0 ff 49 8b 1e 49 c7 06 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df <42> 80 3c 30 00 44 8b 64 24 04 74 08 48 89 df e8 e1 5a e0 ff 4c 8b
RSP: 0018:ffffc90010847820 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff888076d2da00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 7ffffffffffffffa
RBP: ffffc90010847a30 R08: ffff888057a7ce1f R09: 1ffff1100af4f9c3
R10: dffffc0000000000 R11: ffffffff81fe9d40 R12: dffffc0000000000
R13: 7ffffffffffffffa R14: dffffc0000000000 R15: ffff8880217de028
FS:  00007feaabdb16c0(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feaaaf74460 CR3: 00000000757a8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1158
 splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1227
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feaaaf8e9a9
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:00007feaabdb1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007feaab1b6160 RCX: 00007feaaaf8e9a9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000008
RBP: 00007feaab010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007feaab1b6160 R15: 00007ffd518444c8
 </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+0xa9b/0x1000 fs/splice.c:754
Code: 00 74 08 4c 89 f7 e8 14 5b e0 ff 49 8b 1e 49 c7 06 00 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df <42> 80 3c 30 00 44 8b 64 24 04 74 08 48 89 df e8 e1 5a e0 ff 4c 8b
RSP: 0018:ffffc90010847820 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff888076d2da00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 7ffffffffffffffa
RBP: ffffc90010847a30 R08: ffff888057a7ce1f R09: 1ffff1100af4f9c3
R10: dffffc0000000000 R11: ffffffff81fe9d40 R12: dffffc0000000000
R13: 7ffffffffffffffa R14: dffffc0000000000 R15: ffff8880217de028
FS:  00007feaabdb16c0(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3da3ee CR3: 00000000757a8000 CR4: 00000000003526f0
DR0: 000000000000c4d1 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   4:	89 f7                	mov    %esi,%edi
   6:	e8 14 5b e0 ff       	call   0xffe05b1f
   b:	49 8b 1e             	mov    (%r14),%rbx
   e:	49 c7 06 00 00 00 00 	movq   $0x0,(%r14)
  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 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
  27:	fc ff df
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	44 8b 64 24 04       	mov    0x4(%rsp),%r12d
  34:	74 08                	je     0x3e
  36:	48 89 df             	mov    %rbx,%rdi
  39:	e8 e1 5a e0 ff       	call   0xffe05b1f
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b