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BUG: KCSAN: data-race in do_sendfile / do_sendfile

write to 0xffff88811fa67430 of 8 bytes by task 6157 on cpu 0:
 do_sendfile+0x427/0x660 fs/read_write.c:1377
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88811fa67430 of 8 bytes by task 6161 on cpu 1:
 do_sendfile+0x427/0x660 fs/read_write.c:1377
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000001 -> 0x0000000000000f23

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6161 Comm: syz.5.881 Not tainted 6.14.0-rc2-syzkaller-00253-g78a632a2086c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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