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BUG: KCSAN: data-race in generic_fillattr / kernfs_refresh_inode

write to 0xffff888120886cf8 of 16 bytes by task 13439 on cpu 0:
 set_inode_attr fs/kernfs/inode.c:165 [inline]
 kernfs_refresh_inode+0x96/0x160 fs/kernfs/inode.c:180
 kernfs_iop_getattr+0x5e/0x90 fs/kernfs/inode.c:193
 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

read to 0xffff888120886cf8 of 16 bytes by task 5281 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_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: 5281 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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