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BUG: KCSAN: data-race in page_cache_delete / shmem_getpage_gfp

read-write to 0xffff888107ac1ec0 of 8 bytes by task 6720 on cpu 1:
 page_cache_delete+0x32c/0x360 mm/filemap.c:145
 __filemap_remove_folio+0x3b/0xf0 mm/filemap.c:223
 __remove_mapping+0x42a/0x530 mm/vmscan.c:1307
 shrink_page_list+0x1a98/0x3d40 mm/vmscan.c:1889
 reclaim_pages+0x4e4/0x660 mm/vmscan.c:2564
 madvise_cold_or_pageout_pte_range+0x7a4/0x7f0 mm/madvise.c:482
 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+0x935/0x10c0 mm/pagewalk.c:379
 walk_page_range+0x121/0x2f0 mm/pagewalk.c:475
 madvise_pageout_page_range mm/madvise.c:540 [inline]
 madvise_pageout mm/madvise.c:577 [inline]
 madvise_vma_behavior mm/madvise.c:995 [inline]
 madvise_walk_vmas mm/madvise.c:1221 [inline]
 do_madvise+0xe0c/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 0xffff888107ac1ec0 of 8 bytes by task 6702 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_shared_fault mm/memory.c:4295 [inline]
 do_fault+0x5df/0xb20 mm/memory.c:4373
 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
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30
 copy_user_enhanced_fast_string+0xa/0x40
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0x72/0x90 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:160 [inline]
 get_random_bytes_user+0x14d/0x2a0 drivers/char/random.c:562
 __do_sys_getrandom drivers/char/random.c:1491 [inline]
 __se_sys_getrandom drivers/char/random.c:1466 [inline]
 __x64_sys_getrandom+0xd6/0x130 drivers/char/random.c:1466
 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: 0x0000000000000837 -> 0x0000000000000831

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6702 Comm: syz-executor.1 Tainted: G        W         5.18.0-rc7-syzkaller-00121-g3d7285a335ed-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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