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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

read-write to 0xffff888103c0a120 of 8 bytes by task 3096 on cpu 1:
 shmem_unlink+0x108/0x180 mm/shmem.c:3366
 shmem_rename2+0x1dc/0x2c0 mm/shmem.c:3449
 vfs_rename+0x867/0x9c0 fs/namei.c:4879
 do_renameat2+0x732/0xa50 fs/namei.c:5036
 __do_sys_rename fs/namei.c:5083 [inline]
 __se_sys_rename fs/namei.c:5081 [inline]
 __x64_sys_rename+0x5c/0x70 fs/namei.c:5081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103c0a120 of 8 bytes by task 3630 on cpu 0:
 i_size_read include/linux/fs.h:910 [inline]
 generic_fillattr+0x144/0x2f0 fs/stat.c:59
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x198/0x1e0 fs/stat.c:176
 vfs_statx+0x140/0x320 fs/stat.c:248
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000001720 -> 0x000000000000170c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3630 Comm: udevd Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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