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: 7352 Comm: syz.0.404 Not tainted 6.14.0-syzkaller-10167-g93d52288679e #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:ffffc900064ff918 EFLAGS: 00010202
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8240b015
RDX: 0000000000000001 RSI: ffffffff8240aeb6 RDI: 0000000000000008
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000000
R10: 7fffffffffffffa8 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888027be4028 R14: ffff88802fcb1c00 R15: 7fffffffffffffa8
FS:  00007f20219506c0(0000) GS:ffff8880d69dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001900 CR3: 000000005256a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000c DR6: 00000000ffff0ff0 DR7: 0000000000000400
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+0xafd/0xe50 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1415
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2020b8d169
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:00007f2021950038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f2020da5fa0 RCX: 00007f2020b8d169
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007f2020c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2020da5fa0 R15: 00007ffd4582f6b8
 </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:ffffc900064ff918 EFLAGS: 00010202
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8240b015
RDX: 0000000000000001 RSI: ffffffff8240aeb6 RDI: 0000000000000008
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000000
R10: 7fffffffffffffa8 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888027be4028 R14: ffff88802fcb1c00 R15: 7fffffffffffffa8
FS:  00007f20219506c0(0000) GS:ffff8880d6cdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005256a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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