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BUG: KCSAN: data-race in __filemap_remove_folio / shmem_get_folio_gfp

read-write to 0xffff888104916f08 of 8 bytes by task 3542 on cpu 1:
 page_cache_delete mm/filemap.c:150 [inline]
 __filemap_remove_folio+0x224/0x320 mm/filemap.c:228
 __remove_mapping+0x35b/0x480 mm/vmscan.c:1457
 shrink_folio_list+0x137a/0x2550 mm/vmscan.c:2102
 reclaim_folio_list+0x7b/0x1d0 mm/vmscan.c:2801
 reclaim_pages+0x220/0x280 mm/vmscan.c:2837
 madvise_cold_or_pageout_pte_range+0x82c/0x890 mm/madvise.c:529
 walk_pmd_range mm/pagewalk.c:140 [inline]
 walk_pud_range mm/pagewalk.c:218 [inline]
 walk_p4d_range mm/pagewalk.c:253 [inline]
 walk_pgd_range+0x7f3/0xd10 mm/pagewalk.c:290
 __walk_page_range+0xc2/0x320 mm/pagewalk.c:392
 walk_page_range+0x20b/0x330 mm/pagewalk.c:490
 madvise_pageout_page_range mm/madvise.c:587 [inline]
 madvise_pageout mm/madvise.c:614 [inline]
 madvise_vma_behavior mm/madvise.c:1035 [inline]
 madvise_walk_vmas mm/madvise.c:1264 [inline]
 do_madvise+0x1eea/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 0xffff888104916f08 of 8 bytes by task 3516 on cpu 0:
 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:4191 [inline]
 do_read_fault mm/memory.c:4540 [inline]
 do_fault mm/memory.c:4663 [inline]
 do_pte_missing mm/memory.c:3664 [inline]
 handle_pte_fault mm/memory.c:4932 [inline]
 __handle_mm_fault mm/memory.c:5072 [inline]
 handle_mm_fault+0x1224/0x2c10 mm/memory.c:5226
 do_user_addr_fault arch/x86/mm/fault.c:1392 [inline]
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x24d/0x650 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 fault_in_readable+0xf8/0x1b0
 fault_in_iov_iter_readable+0x82/0x180 lib/iov_iter.c:216
 generic_perform_write+0x10c/0x410 mm/filemap.c:3913
 ext4_buffered_write_iter+0x1f6/0x370 fs/ext4/file.c:299
 ext4_file_write_iter+0x283/0x1230
 call_write_iter include/linux/fs.h:1871 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4ab/0x7d0 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 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: 0x0000000000000260 -> 0x000000000000025f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3516 Comm: syz-executor.4 Not tainted 6.4.0-syzkaller-12415-g8fc3b8f082cc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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