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BUG: KCSAN: data-race in __filemap_remove_folio / shmem_get_folio_gfp

read-write to 0xffff888106e39ea8 of 8 bytes by task 5827 on cpu 0:
 page_cache_delete mm/filemap.c:145 [inline]
 __filemap_remove_folio+0x216/0x2f0 mm/filemap.c:223
 __remove_mapping+0x35c/0x480 mm/vmscan.c:1379
 shrink_folio_list+0x11d4/0x1e90 mm/vmscan.c:2016
 reclaim_folio_list mm/vmscan.c:2662 [inline]
 reclaim_pages+0x3de/0x550 mm/vmscan.c:2698
 madvise_cold_or_pageout_pte_range+0x8ea/0x930 mm/madvise.c:494
 walk_pmd_range mm/pagewalk.c:128 [inline]
 walk_pud_range mm/pagewalk.c:205 [inline]
 walk_p4d_range mm/pagewalk.c:240 [inline]
 walk_pgd_range+0x832/0xd00 mm/pagewalk.c:277
 __walk_page_range+0xba/0x300 mm/pagewalk.c:379
 walk_page_range+0x200/0x320 mm/pagewalk.c:477
 madvise_pageout_page_range mm/madvise.c:552 [inline]
 madvise_pageout mm/madvise.c:589 [inline]
 madvise_vma_behavior mm/madvise.c:1011 [inline]
 madvise_walk_vmas mm/madvise.c:1240 [inline]
 do_madvise+0x1348/0x1af0 mm/madvise.c:1419
 __do_sys_madvise mm/madvise.c:1432 [inline]
 __se_sys_madvise mm/madvise.c:1430 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1430
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888106e39ea8 of 8 bytes by task 5825 on cpu 1:
 shmem_recalc_inode mm/shmem.c:353 [inline]
 shmem_get_folio_gfp+0xd24/0x1330 mm/shmem.c:1953
 shmem_fault+0xd5/0x3d0 mm/shmem.c:2128
 __do_fault mm/memory.c:4203 [inline]
 do_read_fault mm/memory.c:4554 [inline]
 do_fault+0x4e8/0xaf0 mm/memory.c:4683
 handle_pte_fault mm/memory.c:4955 [inline]
 __handle_mm_fault mm/memory.c:5097 [inline]
 handle_mm_fault+0x877/0xa80 mm/memory.c:5218
 faultin_page mm/gup.c:1009 [inline]
 __get_user_pages+0x32a/0xbf0 mm/gup.c:1230
 populate_vma_page_range mm/gup.c:1587 [inline]
 __mm_populate+0x281/0x380 mm/gup.c:1701
 mm_populate include/linux/mm.h:2744 [inline]
 vm_mmap_pgoff+0x160/0x1f0 mm/util.c:525
 ksys_mmap_pgoff+0xc2/0x320 mm/mmap.c:1457
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000001bf -> 0x00000000000001b8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5825 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-12196-g1501278bb7ba-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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