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BUG: KCSAN: data-race in shmem_symlink / vfs_getattr_nosec

write to 0xffff88811fcd0c80 of 8 bytes by task 23744 on cpu 0:
 shmem_symlink+0x2ea/0x430 mm/shmem.c:3115
 vfs_symlink+0x218/0x2f0 fs/namei.c:3953
 do_symlinkat+0xee/0x280 fs/namei.c:3980
 __do_sys_symlink fs/namei.c:3999 [inline]
 __se_sys_symlink fs/namei.c:3997 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:3997
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811fcd0c80 of 8 bytes by task 23848 on cpu 1:
 i_size_read include/linux/fs.h:874 [inline]
 generic_fillattr fs/stat.c:45 [inline]
 vfs_getattr_nosec+0x262/0x310 fs/stat.c:90
 vfs_getattr fs/stat.c:124 [inline]
 vfs_statx+0x148/0x2b0 fs/stat.c:206
 vfs_stat include/linux/fs.h:3298 [inline]
 __do_sys_newstat fs/stat.c:361 [inline]
 __se_sys_newstat+0x46/0x250 fs/stat.c:357
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:357
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23848 Comm: systemd-udevd Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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