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BUG: KCSAN: data-race in generic_fillattr / shmem_symlink

read-write to 0xffff888103bda410 of 8 bytes by task 2520 on cpu 1:
 shmem_symlink+0x31b/0x390 mm/shmem.c:3499
 vfs_symlink+0xc2/0x1a0 fs/namei.c:4464
 do_symlinkat+0xe3/0x340 fs/namei.c:4490
 __do_sys_symlink fs/namei.c:4511 [inline]
 __se_sys_symlink fs/namei.c:4509 [inline]
 __x64_sys_symlink+0x56/0x60 fs/namei.c:4509
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103bda410 of 8 bytes by task 5053 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:1121
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr fs/stat.c:172 [inline]
 vfs_statx+0x266/0x430 fs/stat.c:244
 vfs_fstatat+0xcd/0x100 fs/stat.c:295
 __do_sys_newfstatat fs/stat.c:459 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:453
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:453
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000000000012c -> 0x0000000000000140

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5053 Comm: udevd Not tainted 6.6.0-syzkaller-16159-g3ca112b71f35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
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I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop3, sector 34 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop3, sector 34 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
buffer_io_error: 2 callbacks suppressed
Buffer I/O error on dev loop3p1, logical block 0, async page read
udevd[5053]: inotify_add_watch(7, /dev/loop3p1, 10) failed: No such file or directory