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BUG: KCSAN: data-race in generic_fillattr / kernfs_refresh_inode

write to 0xffff888120c95568 of 16 bytes by task 5281 on cpu 0:
 set_inode_attr fs/kernfs/inode.c:166 [inline]
 kernfs_refresh_inode+0xbb/0x160 fs/kernfs/inode.c:180
 kernfs_iop_permission+0x60/0xa0 fs/kernfs/inode.c:285
 do_inode_permission fs/namei.c:384 [inline]
 inode_permission+0x22d/0x360 fs/namei.c:449
 may_open.isra.0+0x13d/0x240 fs/namei.c:2852
 do_open fs/namei.c:3227 [inline]
 path_openat+0x15a2/0x23d0 fs/namei.c:3346
 do_filp_open+0x11e/0x1b0 fs/namei.c:3373
 do_sys_openat2+0x52e/0x680 fs/open.c:1148
 do_sys_open+0xa2/0x110 fs/open.c:1164
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_open fs/open.c:1170 [inline]
 __se_sys_open fs/open.c:1168 [inline]
 __x64_sys_open+0x50/0x60 fs/open.c:1168
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888120c95568 of 16 bytes by task 23406 on cpu 1:
 generic_fillattr+0x145/0x1e0 fs/stat.c:46
 kernfs_iop_getattr+0x75/0x90 fs/kernfs/inode.c:196
 vfs_getattr_nosec+0x127/0x160 fs/stat.c:83
 vfs_getattr+0x53/0x70 fs/stat.c:120
 vfs_statx_fd+0x74/0xc0 fs/stat.c:147
 vfs_fstat include/linux/fs.h:3295 [inline]
 __do_sys_newfstat+0x46/0xa0 fs/stat.c:388
 __se_sys_newfstat fs/stat.c:385 [inline]
 __x64_sys_newfstat+0x37/0x50 fs/stat.c:385
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23406 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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