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BUG: KCSAN: data-race in read_pages / read_pages

read to 0xffff8881045a9d84 of 4 bytes by task 24425 on cpu 0:
 read_pages+0x259/0x530 mm/readahead.c:171
 page_cache_ra_unbounded+0x224/0x2e0
 do_page_cache_ra mm/readahead.c:299 [inline]
 page_cache_ra_order+0xd5/0xf0 mm/readahead.c:546
 do_sync_mmap_readahead+0x410/0x450 mm/filemap.c:3202
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3294
 __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

write to 0xffff8881045a9d84 of 4 bytes by task 24430 on cpu 1:
 read_pages+0x284/0x530 mm/readahead.c:172
 page_cache_ra_unbounded+0x2aa/0x2e0 mm/readahead.c:269
 do_page_cache_ra mm/readahead.c:299 [inline]
 page_cache_ra_order+0xd5/0xf0 mm/readahead.c:546
 do_sync_mmap_readahead+0x410/0x450 mm/filemap.c:3202
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3294
 __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: 0x00000002 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24430 Comm: syz-executor.5 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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