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BUG: KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead

write to 0xffff888101836a98 of 8 bytes by task 2381 on cpu 0:
 do_sync_mmap_readahead+0x2cf/0x370 mm/filemap.c:2943
 filemap_fault+0x234/0x8b0 mm/filemap.c:3039
 __do_fault mm/memory.c:3872 [inline]
 do_read_fault mm/memory.c:4187 [inline]
 do_fault mm/memory.c:4316 [inline]
 handle_pte_fault mm/memory.c:4574 [inline]
 __handle_mm_fault mm/memory.c:4709 [inline]
 handle_mm_fault+0xba6/0x1590 mm/memory.c:4807
 do_user_addr_fault+0x617/0xb90 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30

write to 0xffff888101836a98 of 8 bytes by task 2380 on cpu 1:
 do_sync_mmap_readahead+0x2cf/0x370 mm/filemap.c:2943
 filemap_fault+0x234/0x8b0 mm/filemap.c:3039
 __do_fault mm/memory.c:3872 [inline]
 do_read_fault mm/memory.c:4187 [inline]
 do_fault mm/memory.c:4316 [inline]
 handle_pte_fault mm/memory.c:4574 [inline]
 __handle_mm_fault mm/memory.c:4709 [inline]
 handle_mm_fault+0xba6/0x1590 mm/memory.c:4807
 do_user_addr_fault+0x617/0xb90 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30

value changed: 0x0000000000000167 -> 0x00000000000000cb

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2380 Comm: udevd Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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I/O error, dev loop3, sector 131328 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop3, sector 131328 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop3, logical block 16416, async page read