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BUG: KCSAN: data-race in __delete_from_page_cache / shmem_getpage_gfp

write to 0xffff8881475e4530 of 8 bytes by task 22788 on cpu 1:
 page_cache_delete mm/filemap.c:146 [inline]
 __delete_from_page_cache+0x1e1/0x2c0 mm/filemap.c:231
 __remove_mapping+0x336/0x3f0 mm/vmscan.c:1274
 shrink_page_list+0x1508/0x2620 mm/vmscan.c:1844
 reclaim_pages+0x478/0x640 mm/vmscan.c:2588
 madvise_cold_or_pageout_pte_range+0x63f/0x680 mm/madvise.c:475
 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 mm/pagewalk.c:277 [inline]
 __walk_page_range+0x981/0x1160 mm/pagewalk.c:379
 walk_page_range+0x131/0x300 mm/pagewalk.c:475
 madvise_pageout_page_range mm/madvise.c:528 [inline]
 madvise_pageout mm/madvise.c:565 [inline]
 madvise_vma mm/madvise.c:993 [inline]
 do_madvise+0xa0b/0x1140 mm/madvise.c:1202
 __do_sys_madvise mm/madvise.c:1228 [inline]
 __se_sys_madvise mm/madvise.c:1226 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1226
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881475e4530 of 8 bytes by task 22680 on cpu 0:
 shmem_recalc_inode mm/shmem.c:363 [inline]
 shmem_getpage_gfp+0xf23/0x12c0 mm/shmem.c:1946
 shmem_fault+0xd1/0x3c0 mm/shmem.c:2114
 __do_fault mm/memory.c:3849 [inline]
 do_read_fault mm/memory.c:4164 [inline]
 do_fault mm/memory.c:4293 [inline]
 handle_pte_fault mm/memory.c:4551 [inline]
 __handle_mm_fault mm/memory.c:4686 [inline]
 handle_mm_fault+0xba6/0x1590 mm/memory.c:4784
 faultin_page mm/gup.c:939 [inline]
 __get_user_pages+0x388/0xc80 mm/gup.c:1160
 populate_vma_page_range mm/gup.c:1492 [inline]
 __mm_populate+0x24d/0x370 mm/gup.c:1601
 mm_populate include/linux/mm.h:2734 [inline]
 vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524
 ksys_mmap_pgoff+0xcf/0x350 mm/mmap.c:1624
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000139 -> 0x0000000000000137

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22680 Comm: syz-executor.5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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