==================================================================
BUG: KCSAN: data-race in shmem_add_to_page_cache / shmem_getattr

read-write to 0xffff88811516a880 of 8 bytes by task 13787 on cpu 0:
 shmem_add_to_page_cache+0x3b9/0x4b0 mm/shmem.c:808
 shmem_alloc_and_add_folio mm/shmem.c:1700 [inline]
 shmem_get_folio_gfp+0x500/0xb70 mm/shmem.c:2066
 shmem_get_folio mm/shmem.c:2171 [inline]
 shmem_write_begin+0xa0/0x1c0 mm/shmem.c:2754
 generic_perform_write+0x1d5/0x410 mm/filemap.c:4016
 shmem_file_write_iter+0xc8/0xf0 mm/shmem.c:2930
 __kernel_write_iter+0x24f/0x4e0 fs/read_write.c:523
 dump_emit_page fs/coredump.c:893 [inline]
 dump_user_range+0x3a7/0x550 fs/coredump.c:954
 elf_core_dump+0x1aeb/0x1c30 fs/binfmt_elf.c:2083
 do_coredump+0xff6/0x1860 fs/coredump.c:767
 get_signal+0xdc1/0x1080 kernel/signal.c:2894
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x94/0x130 kernel/entry/common.c:231
 irqentry_exit+0x12/0x50 kernel/entry/common.c:334
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff88811516a880 of 8 bytes by task 12468 on cpu 1:
 shmem_getattr+0x69/0x200 mm/shmem.c:1138
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x19b/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+0x55/0x70 fs/stat.c:462
 x64_sys_call+0x1451/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000001437 -> 0x0000000000001438

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12468 Comm: syz-executor Not tainted 6.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================