KCSAN: data-race in do_readv / do

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_readv / do_sendfile fs				1	1377d	1377d	0/28	auto-closed as invalid on 2021/06/26 15:47

==================================================================
BUG: KCSAN: data-race in do_readv / do_sendfile

write to 0xffff888119ffc430 of 8 bytes by task 6421 on cpu 0:
 do_readv+0x127/0x220 fs/read_write.c:1075
 __do_sys_readv fs/read_write.c:1158 [inline]
 __se_sys_readv fs/read_write.c:1155 [inline]
 __x64_sys_readv+0x45/0x50 fs/read_write.c:1155
 x64_sys_call+0x2c34/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:20
 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

read to 0xffff888119ffc430 of 8 bytes by task 6420 on cpu 1:
 do_sendfile+0x113/0x660 fs/read_write.c:1314
 __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: 0x0000000000000000 -> 0x000000000000000e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6420 Comm: syz.4.1074 Not tainted 6.14.0-rc3-syzkaller-00295-g27102b38b8ca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================