KCSAN: data-race in kernfs_refresh_inode / security_file

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in kernfs_refresh_inode / security_file_open (2) lsm				5	1899d	1963d	0/28	auto-closed as invalid on 2020/04/15 19:23

================================================================== BUG: KCSAN: data-race in kernfs_refresh_inode / security_file_open write to 0xffff8880bb462490 of 2 bytes by task 7239 on cpu 0: kernfs_refresh_inode+0x42/0x140 fs/kernfs/inode.c:172 kernfs_iop_getattr+0x68/0x90 fs/kernfs/inode.c:191 vfs_getattr_nosec+0x12e/0x170 fs/stat.c:81 vfs_getattr+0x54/0x70 fs/stat.c:118 vfs_statx+0x102/0x190 fs/stat.c:191 vfs_stat include/linux/fs.h:3242 [inline] __do_sys_newstat+0x51/0xb0 fs/stat.c:341 __se_sys_newstat fs/stat.c:337 [inline] __x64_sys_newstat+0x3a/0x50 fs/stat.c:337 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880bb462490 of 2 bytes by task 3890 on cpu 1: fsnotify_perm include/linux/fsnotify.h:82 [inline] security_file_open+0x11c/0x210 security/security.c:1501 do_dentry_open+0x20a/0x8f0 fs/open.c:784 vfs_open+0x62/0x80 fs/open.c:914 do_last fs/namei.c:3408 [inline] path_openat+0xf75/0x36e0 fs/namei.c:3525 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1110 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3890 Comm: udevd Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================