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BUG: KCSAN: data-race in do_sendfile / do_sendfile

write to 0xffff88810492d568 of 8 bytes by task 14835 on cpu 1:
 do_sendfile+0x749/0x950 fs/read_write.c:1270
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 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

write to 0xffff88810492d568 of 8 bytes by task 14842 on cpu 0:
 do_sendfile+0x749/0x950 fs/read_write.c:1270
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 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: 0x0000000000000012 -> 0x00000000000007ce

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14842 Comm: syz-executor.5 Not tainted 6.3.0-rc5-syzkaller-00137-gf2afccfefe7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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