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BUG: KCSAN: data-race in generic_fillattr / shmem_symlink

read-write to 0xffff888103a600d0 of 8 bytes by task 3307 on cpu 1:
 shmem_symlink+0x31b/0x390 mm/shmem.c:3514
 vfs_symlink+0xc2/0x1a0 fs/namei.c:4480
 do_symlinkat+0xe3/0x340 fs/namei.c:4506
 __do_sys_symlink fs/namei.c:4527 [inline]
 __se_sys_symlink fs/namei.c:4525 [inline]
 __x64_sys_symlink+0x56/0x60 fs/namei.c:4525
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103a600d0 of 8 bytes by task 3069 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+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000000000c8 -> 0x00000000000000dc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3069 Comm: udevd Not tainted 6.8.0-rc2-syzkaller-00419-gb555d191561a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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