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BUG: KCSAN: data-race in do_sendfile / ksys_write

write to 0xffff8881512bf668 of 8 bytes by task 25856 on cpu 0:
 do_sendfile+0x717/0x910 fs/read_write.c:1264
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1303 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1303
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff8881512bf668 of 8 bytes by task 25855 on cpu 1:
 ksys_write+0x11b/0x1a0 fs/read_write.c:633
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000160 -> 0x000000000000016b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25855 Comm: syz-executor.2 Not tainted 6.0.0-rc7-syzkaller-00042-g46452d3786a8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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