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BUG: KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead

write to 0xffff8881075c1884 of 4 bytes by task 10266 on cpu 1:
 do_sync_mmap_readahead+0x3f5/0x450 mm/filemap.c:3151
 filemap_fault+0x426/0xc30 mm/filemap.c:3245
 __do_fault+0xb2/0x1f0 mm/memory.c:4376
 do_read_fault mm/memory.c:4738 [inline]
 do_fault mm/memory.c:4868 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xd5f/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x2f9/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 __get_user_8+0x11/0x20 arch/x86/lib/getuser.S:85
 __do_sys_io_submit fs/aio.c:2101 [inline]
 __se_sys_io_submit+0xcd/0x280 fs/aio.c:2076
 __x64_sys_io_submit+0x43/0x50 fs/aio.c:2076
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

write to 0xffff8881075c1884 of 4 bytes by task 10248 on cpu 0:
 do_sync_mmap_readahead+0x3f5/0x450 mm/filemap.c:3151
 filemap_fault+0x426/0xc30 mm/filemap.c:3245
 __do_fault+0xb2/0x1f0 mm/memory.c:4376
 do_shared_fault mm/memory.c:4798 [inline]
 do_fault mm/memory.c:4872 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xb9a/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x2f9/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 _copy_to_user+0x77/0x90 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 aio_read_events_ring fs/aio.c:1266 [inline]
 aio_read_events+0x1fa/0x3b0 fs/aio.c:1293
 read_events fs/aio.c:1350 [inline]
 do_io_getevents+0x29a/0x3f0 fs/aio.c:2225
 __do_sys_io_getevents fs/aio.c:2258 [inline]
 __se_sys_io_getevents fs/aio.c:2246 [inline]
 __x64_sys_io_getevents+0xca/0x190 fs/aio.c:2246
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000010 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10248 Comm: syz-executor.2 Not tainted 6.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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