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BUG: KCSAN: data-race in __se_sys_vmsplice / do_splice

write to 0xffff88813693e650 of 4 bytes by task 15866 on cpu 0:
 add_to_pipe fs/splice.c:261 [inline]
 iter_to_pipe fs/splice.c:1302 [inline]
 vmsplice_to_pipe fs/splice.c:1379 [inline]
 __do_sys_vmsplice fs/splice.c:1443 [inline]
 __se_sys_vmsplice+0x6cc/0xaa0 fs/splice.c:1417
 __x64_sys_vmsplice+0x55/0x60 fs/splice.c:1417
 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 0xffff88813693e650 of 4 bytes by task 15858 on cpu 1:
 ipipe_prep fs/splice.c:1492 [inline]
 splice_pipe_to_pipe fs/splice.c:1571 [inline]
 do_splice+0x1cd/0xf40 fs/splice.c:1157
 __do_splice fs/splice.c:1260 [inline]
 __do_sys_splice fs/splice.c:1471 [inline]
 __se_sys_splice+0x24c/0x380 fs/splice.c:1453
 __x64_sys_splice+0x78/0x90 fs/splice.c:1453
 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: 1 PID: 15858 Comm: syz-executor.1 Not tainted 6.4.0-rc5-syzkaller-00245-g64569520920a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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