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BUG: KCSAN: data-race in do_sync_mmap_readahead / ondemand_readahead

write to 0xffff8881407deb78 of 8 bytes by task 29060 on cpu 0:
 do_sync_mmap_readahead+0x3ce/0x450 mm/filemap.c:3198
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3294
 __do_fault mm/memory.c:4203 [inline]
 do_shared_fault mm/memory.c:4634 [inline]
 do_fault mm/memory.c:4708 [inline]
 do_pte_missing mm/memory.c:3668 [inline]
 handle_pte_fault mm/memory.c:4977 [inline]
 __handle_mm_fault mm/memory.c:5118 [inline]
 handle_mm_fault+0x16a6/0x2c30 mm/memory.c:5283
 do_user_addr_fault arch/x86/mm/fault.c:1391 [inline]
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x24d/0x660 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff8881407deb78 of 8 bytes by task 29061 on cpu 1:
 ondemand_readahead+0x13a/0x690 mm/readahead.c:580
 page_cache_async_ra+0x94/0xa0 mm/readahead.c:717
 do_async_mmap_readahead mm/filemap.c:3230 [inline]
 filemap_fault+0x3a0/0xbf0 mm/filemap.c:3284
 __do_fault mm/memory.c:4203 [inline]
 do_read_fault mm/memory.c:4567 [inline]
 do_fault mm/memory.c:4704 [inline]
 do_pte_missing mm/memory.c:3668 [inline]
 handle_pte_fault mm/memory.c:4977 [inline]
 __handle_mm_fault mm/memory.c:5118 [inline]
 handle_mm_fault+0x1573/0x2c30 mm/memory.c:5283
 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:3285 [inline]
 vm_mmap_pgoff+0x1a3/0x240 mm/util.c:551
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1400
 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: 0x0000000000000420 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29061 Comm: syz-executor.2 Not tainted 6.5.0-syzkaller-08894-gb97d64c72259 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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