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BUG: KCSAN: data-race in ondemand_readahead / page_cache_ra_order

write to 0xffff88813d3c5984 of 4 bytes by task 4682 on cpu 0:
 ondemand_readahead+0x364/0x690
 page_cache_async_ra+0x94/0xa0 mm/readahead.c:717
 do_async_mmap_readahead mm/filemap.c:3227 [inline]
 filemap_fault+0x3a0/0xbf0 mm/filemap.c:3281
 __do_fault mm/memory.c:4207 [inline]
 do_read_fault mm/memory.c:4571 [inline]
 do_fault mm/memory.c:4708 [inline]
 do_pte_missing mm/memory.c:3672 [inline]
 handle_pte_fault mm/memory.c:4981 [inline]
 __handle_mm_fault mm/memory.c:5122 [inline]
 handle_mm_fault+0x15e2/0x2cc0 mm/memory.c:5287
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 populate_vma_page_range mm/gup.c:1666 [inline]
 __mm_populate+0x216/0x330 mm/gup.c:1775
 mm_populate include/linux/mm.h:3305 [inline]
 vm_mmap_pgoff+0x1a7/0x240 mm/util.c:551
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1420
 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 0xffff88813d3c5984 of 4 bytes by task 4675 on cpu 1:
 page_cache_ra_order+0x5a/0xf0 mm/readahead.c:546
 do_sync_mmap_readahead+0x410/0x450 mm/filemap.c:3199
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3291
 __do_fault mm/memory.c:4207 [inline]
 do_shared_fault mm/memory.c:4638 [inline]
 do_fault mm/memory.c:4712 [inline]
 do_pte_missing mm/memory.c:3672 [inline]
 handle_pte_fault mm/memory.c:4981 [inline]
 __handle_mm_fault mm/memory.c:5122 [inline]
 handle_mm_fault+0x170f/0x2cc0 mm/memory.c:5287
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f7/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x00000008 -> 0x00000020

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4675 Comm: syz-executor.4 Not tainted 6.6.0-syzkaller-00207-g14ab6d425e80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
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