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BUG: KCSAN: data-race in __delete_from_page_cache / shmem_getpage_gfp

write to 0xffff888104d5b3a0 of 8 bytes by task 5916 on cpu 1:
 page_cache_delete mm/filemap.c:147 [inline]
 __delete_from_page_cache+0x1de/0x280 mm/filemap.c:232
 __remove_mapping+0x35b/0x470 mm/vmscan.c:1174
 shrink_page_list+0x15c2/0x2670 mm/vmscan.c:1746
 reclaim_pages+0x478/0x640 mm/vmscan.c:2482
 madvise_cold_or_pageout_pte_range+0x646/0x690 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+0x93f/0x10e0 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+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888104d5b3a0 of 8 bytes by task 5874 on cpu 0:
 shmem_recalc_inode mm/shmem.c:364 [inline]
 shmem_getpage_gfp+0xfd9/0x13d0 mm/shmem.c:1945
 shmem_fault+0xcf/0x470 mm/shmem.c:2113
 __do_fault mm/memory.c:3857 [inline]
 do_read_fault mm/memory.c:4172 [inline]
 do_fault mm/memory.c:4300 [inline]
 handle_pte_fault mm/memory.c:4558 [inline]
 __handle_mm_fault mm/memory.c:4693 [inline]
 handle_mm_fault+0xbb7/0x1580 mm/memory.c:4791
 faultin_page mm/gup.c:937 [inline]
 __get_user_pages+0x381/0xc50 mm/gup.c:1158
 populate_vma_page_range mm/gup.c:1490 [inline]
 __mm_populate+0x24d/0x370 mm/gup.c:1599
 mm_populate include/linux/mm.h:2624 [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+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000471 -> 0x000000000000046e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5874 Comm: syz-executor.0 Not tainted 5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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