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BUG: KCSAN: data-race in __filemap_remove_folio / shmem_get_folio_gfp

read-write to 0xffff888101b3db90 of 8 bytes by task 8305 on cpu 1:
 page_cache_delete mm/filemap.c:147 [inline]
 __filemap_remove_folio+0x22f/0x330 mm/filemap.c:225
 __remove_mapping+0x35b/0x480 mm/vmscan.c:1410
 shrink_folio_list+0x11fb/0x24d0 mm/vmscan.c:2044
 reclaim_folio_list+0x7b/0x1d0 mm/vmscan.c:2723
 reclaim_pages+0x220/0x280 mm/vmscan.c:2759
 madvise_cold_or_pageout_pte_range+0x8c1/0x950 mm/madvise.c:516
 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+0x7d7/0xc80 mm/pagewalk.c:277
 __walk_page_range+0xc2/0x310 mm/pagewalk.c:379
 walk_page_range+0x20b/0x330 mm/pagewalk.c:477
 madvise_pageout_page_range mm/madvise.c:574 [inline]
 madvise_pageout mm/madvise.c:601 [inline]
 madvise_vma_behavior mm/madvise.c:1031 [inline]
 madvise_walk_vmas mm/madvise.c:1260 [inline]
 do_madvise+0x1e5f/0x28a0 mm/madvise.c:1439
 __do_sys_madvise mm/madvise.c:1452 [inline]
 __se_sys_madvise mm/madvise.c:1450 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1450
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888101b3db90 of 8 bytes by task 8287 on cpu 0:
 shmem_recalc_inode mm/shmem.c:359 [inline]
 shmem_get_folio_gfp+0xc0a/0x1120 mm/shmem.c:1977
 shmem_fault+0xd9/0x3d0 mm/shmem.c:2152
 __do_fault mm/memory.c:4155 [inline]
 do_shared_fault mm/memory.c:4561 [inline]
 do_fault mm/memory.c:4639 [inline]
 handle_pte_fault mm/memory.c:4923 [inline]
 __handle_mm_fault mm/memory.c:5065 [inline]
 handle_mm_fault+0x1247/0x21d0 mm/memory.c:5211
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x45f/0x640 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:165
 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]
 copyout+0x72/0x90 lib/iov_iter.c:170
 _copy_to_iter+0x274/0x8f0 lib/iov_iter.c:523
 copy_to_iter include/linux/uio.h:181 [inline]
 get_random_bytes_user+0x112/0x260 drivers/char/random.c:451
 __do_sys_getrandom drivers/char/random.c:1391 [inline]
 __se_sys_getrandom drivers/char/random.c:1364 [inline]
 __x64_sys_getrandom+0xcd/0x1a0 drivers/char/random.c:1364
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000692 -> 0x0000000000000691

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8287 Comm: syz-executor.1 Tainted: G        W          6.3.0-rc5-syzkaller-00202-ga79d5c76f705 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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