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BUG: KCSAN: data-race in __se_sys_vmsplice / do_splice

write to 0xffff88814f87f7d0 of 4 bytes by task 27948 on cpu 1:
 add_to_pipe fs/splice.c:245 [inline]
 iter_to_pipe fs/splice.c:1280 [inline]
 vmsplice_to_pipe fs/splice.c:1353 [inline]
 __do_sys_vmsplice fs/splice.c:1417 [inline]
 __se_sys_vmsplice+0x62d/0xaa0 fs/splice.c:1391
 __x64_sys_vmsplice+0x55/0x60 fs/splice.c:1391
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88814f87f7d0 of 4 bytes by task 27933 on cpu 0:
 ipipe_prep fs/splice.c:1466 [inline]
 splice_pipe_to_pipe fs/splice.c:1545 [inline]
 do_splice+0x1cd/0xf40 fs/splice.c:1141
 __do_splice fs/splice.c:1238 [inline]
 __do_sys_splice fs/splice.c:1445 [inline]
 __se_sys_splice+0x2aa/0x380 fs/splice.c:1427
 __x64_sys_splice+0x78/0x90 fs/splice.c:1427
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27933 Comm: syz-executor.3 Not tainted 6.3.0-syzkaller-04626-g0cfd8703e7da #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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