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BUG: KCSAN: data-race in page_cache_delete / shmem_getpage_gfp

read-write to 0xffff888138964e80 of 8 bytes by task 20022 on cpu 1:
 page_cache_delete+0x32c/0x360 mm/filemap.c:145
 __filemap_remove_folio+0x3b/0xf0 mm/filemap.c:223
 filemap_remove_folio+0x69/0x120 mm/filemap.c:255
 truncate_inode_folio+0x204/0x210 mm/truncate.c:196
 shmem_undo_range+0x3d2/0x1160 mm/shmem.c:952
 shmem_truncate_range mm/shmem.c:1044 [inline]
 shmem_fallocate+0x29b/0x980 mm/shmem.c:2671
 vfs_fallocate+0x355/0x3d0 fs/open.c:308
 madvise_remove+0x126/0x1e0 mm/madvise.c:965
 madvise_vma_behavior mm/madvise.c:989 [inline]
 madvise_walk_vmas mm/madvise.c:1221 [inline]
 do_madvise+0x556/0x1300 mm/madvise.c:1399
 __do_sys_madvise mm/madvise.c:1412 [inline]
 __se_sys_madvise mm/madvise.c:1410 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1410
 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+0x44/0xae

read to 0xffff888138964e80 of 8 bytes by task 20024 on cpu 0:
 shmem_recalc_inode mm/shmem.c:362 [inline]
 shmem_getpage_gfp+0x1305/0x16c0 mm/shmem.c:1918
 shmem_fault+0xd2/0x350 mm/shmem.c:2086
 __do_fault mm/memory.c:3915 [inline]
 do_read_fault mm/memory.c:4240 [inline]
 do_fault+0x500/0xb20 mm/memory.c:4369
 handle_pte_fault mm/memory.c:4627 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x825/0xa40 mm/memory.c:4861
 faultin_page mm/gup.c:878 [inline]
 __get_user_pages+0x306/0xb80 mm/gup.c:1099
 populate_vma_page_range mm/gup.c:1442 [inline]
 __mm_populate+0x26e/0x3a0 mm/gup.c:1555
 mm_populate include/linux/mm.h:2701 [inline]
 vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524
 ksys_mmap_pgoff+0xc2/0x320 mm/mmap.c:1628
 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+0x44/0xae

value changed: 0x000000000000035b -> 0x0000000000000351

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20024 Comm: syz-executor.5 Not tainted 5.18.0-rc3-syzkaller-00016-gb253435746d9-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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