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BUG: KCSAN: data-race in generic_fillattr / kernfs_refresh_inode

write to 0xffff88812a329c78 of 16 bytes by task 15815 on cpu 0:
 set_inode_attr fs/kernfs/inode.c:165 [inline]
 kernfs_refresh_inode+0x96/0x160 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_lookup fs/namei.c:1561 [inline]
 link_path_walk.part.0+0x51d/0x700 fs/namei.c:2111
 link_path_walk fs/namei.c:2292 [inline]
 path_lookupat.isra.0+0x75/0x350 fs/namei.c:2318
 filename_lookup+0x145/0x2c0 fs/namei.c:2352
 user_path_at_empty+0x47/0x60 fs/namei.c:2632
 user_path_at include/linux/namei.h:59 [inline]
 do_faccessat+0x12b/0x470 fs/open.c:398
 __do_sys_access fs/open.c:450 [inline]
 __se_sys_access fs/open.c:448 [inline]
 __x64_sys_access+0x3c/0x50 fs/open.c:448
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a329c78 of 16 bytes by task 15617 on cpu 1:
 generic_fillattr+0x120/0x1e0 fs/stat.c:45
 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+0x104/0x190 fs/stat.c:201
 vfs_lstat include/linux/fs.h:3284 [inline]
 __do_sys_newlstat+0x50/0xb0 fs/stat.c:364
 __se_sys_newlstat fs/stat.c:358 [inline]
 __x64_sys_newlstat+0x37/0x50 fs/stat.c:358
 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: 15617 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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