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BUG: KCSAN: data-race in __filemap_remove_folio / shmem_get_folio_gfp

read-write to 0xffff888138404870 of 8 bytes by task 18856 on cpu 0:
 page_cache_delete mm/filemap.c:150 [inline]
 __filemap_remove_folio+0x224/0x320 mm/filemap.c:228
 filemap_remove_folio+0x6c/0x210 mm/filemap.c:260
 truncate_inode_folio+0x19f/0x1e0 mm/truncate.c:196
 shmem_undo_range+0x259/0xb80 mm/shmem.c:950
 shmem_truncate_range mm/shmem.c:1049 [inline]
 shmem_fallocate+0x302/0x8e0 mm/shmem.c:2926
 vfs_fallocate+0x378/0x3e0 fs/open.c:324
 madvise_remove mm/madvise.c:1005 [inline]
 madvise_vma_behavior mm/madvise.c:1029 [inline]
 madvise_walk_vmas mm/madvise.c:1264 [inline]
 do_madvise+0x7a9/0x29b0 mm/madvise.c:1444
 __do_sys_madvise mm/madvise.c:1457 [inline]
 __se_sys_madvise mm/madvise.c:1455 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1455
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888138404870 of 8 bytes by task 18828 on cpu 1:
 shmem_recalc_inode mm/shmem.c:360 [inline]
 shmem_get_folio_gfp+0xe1e/0x1200 mm/shmem.c:1988
 shmem_fault+0xe6/0x3f0 mm/shmem.c:2163
 __do_fault mm/memory.c:4198 [inline]
 do_read_fault mm/memory.c:4547 [inline]
 do_fault mm/memory.c:4670 [inline]
 do_pte_missing mm/memory.c:3664 [inline]
 handle_pte_fault mm/memory.c:4939 [inline]
 __handle_mm_fault mm/memory.c:5079 [inline]
 handle_mm_fault+0x1224/0x2c10 mm/memory.c:5233
 faultin_page mm/gup.c:959 [inline]
 __get_user_pages+0x42e/0xd20 mm/gup.c:1258
 populate_vma_page_range mm/gup.c:1649 [inline]
 __mm_populate+0x23b/0x360 mm/gup.c:1758
 mm_populate include/linux/mm.h:3213 [inline]
 vm_mmap_pgoff+0x1a3/0x240 mm/util.c:548
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1409
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000006f4 -> 0x00000000000006ef

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18828 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00030-gd4f8e13b0614 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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