BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8000000167f01067 P4D 8000000167f01067 PUD 1683a4067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 UID: 0 PID: 17054 Comm: syz.3.5109 Not tainted 6.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
RIP: 0010:iter_file_splice_write+0x444/0x5c0 fs/splice.c:759
Code: 8d 4c d0 0c 44 8b 64 d0 0c 4d 39 e6 0f 8c d7 fc ff ff 48 8d 34 d0 c7 01 00 00 00 00 48 8b 4c d0 10 48 c7 44 d0 10 00 00 00 00 <4c> 8b 59 08 4c 89 ef 41 ff d3 66 90 ff c3 41 83 bd 4c 01 00 00 00
RSP: 0018:ffffc9000197bc70 EFLAGS: 00010206
RAX: ffff88810a7e9400 RBX: 0000000000000010 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88810a7e9400 RDI: ffff888103fef800
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81275250 R12: 0000000000000000
R13: ffff888103fef800 R14: 7ffffffffffeffff R15: 7fffffffffffffff
FS:  00007fdb35e626c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000001681b2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xbf/0x1f0 fs/splice.c:1164
 splice_direct_to_actor+0x13e/0x2d0 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x70/0xb0 fs/splice.c:1233
 do_sendfile+0x1cf/0x2c0 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x9a/0xd0 fs/read_write.c:1410
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdb34f85d29
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:00007fdb35e62038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fdb35175fa0 RCX: 00007fdb34f85d29
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007fdb35001b08 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdb35175fa0 R15: 00007ffca6352d18
 </TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
RIP: 0010:iter_file_splice_write+0x444/0x5c0 fs/splice.c:759
Code: 8d 4c d0 0c 44 8b 64 d0 0c 4d 39 e6 0f 8c d7 fc ff ff 48 8d 34 d0 c7 01 00 00 00 00 48 8b 4c d0 10 48 c7 44 d0 10 00 00 00 00 <4c> 8b 59 08 4c 89 ef 41 ff d3 66 90 ff c3 41 83 bd 4c 01 00 00 00
RSP: 0018:ffffc9000197bc70 EFLAGS: 00010206
RAX: ffff88810a7e9400 RBX: 0000000000000010 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88810a7e9400 RDI: ffff888103fef800
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81275250 R12: 0000000000000000
R13: ffff888103fef800 R14: 7ffffffffffeffff R15: 7fffffffffffffff
FS:  00007fdb35e626c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000001681b2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 4c d0 0c          	lea    0xc(%rax,%rdx,8),%ecx
   4:	44 8b 64 d0 0c       	mov    0xc(%rax,%rdx,8),%r12d
   9:	4d 39 e6             	cmp    %r12,%r14
   c:	0f 8c d7 fc ff ff    	jl     0xfffffce9
  12:	48 8d 34 d0          	lea    (%rax,%rdx,8),%rsi
  16:	c7 01 00 00 00 00    	movl   $0x0,(%rcx)
  1c:	48 8b 4c d0 10       	mov    0x10(%rax,%rdx,8),%rcx
  21:	48 c7 44 d0 10 00 00 	movq   $0x0,0x10(%rax,%rdx,8)
  28:	00 00
* 2a:	4c 8b 59 08          	mov    0x8(%rcx),%r11 <-- trapping instruction
  2e:	4c 89 ef             	mov    %r13,%rdi
  31:	41 ff d3             	call   *%r11
  34:	66 90                	xchg   %ax,%ax
  36:	ff c3                	inc    %ebx
  38:	41 83 bd 4c 01 00 00 	cmpl   $0x0,0x14c(%r13)
  3f:	00