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BUG: KCSAN: data-race in generic_fillattr / shmem_getpage_gfp

write to 0xffff88811d8e3b80 of 8 bytes by task 26239 on cpu 1:
 shmem_getpage_gfp+0xfe7/0x1410 mm/shmem.c:1938
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2526
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3660
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3789
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3821
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88811d8e3b80 of 8 bytes by task 26253 on cpu 0:
 generic_fillattr+0x167/0x190 fs/stat.c:58
 shmem_getattr+0x231/0x250 mm/shmem.c:1048
 vfs_getattr_nosec+0x152/0x2f0 fs/stat.c:105
 vfs_getattr fs/stat.c:142 [inline]
 vfs_fstat fs/stat.c:164 [inline]
 __do_sys_newfstat fs/stat.c:404 [inline]
 __se_sys_newfstat+0x94/0x2c0 fs/stat.c:401
 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:401
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000002b18 -> 0x0000000000002b30

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26253 Comm: syz-executor.0 Not tainted 5.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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