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BUG: KCSAN: data-race in __filemap_add_folio / iomap_dio_complete

read-write to 0xffff88810a969d40 of 8 bytes by task 4501 on cpu 1:
 __filemap_add_folio+0x38c/0x720 mm/filemap.c:900
 filemap_add_folio+0x6f/0x150 mm/filemap.c:935
 page_cache_ra_unbounded+0x15e/0x2e0 mm/readahead.c:251
 do_page_cache_ra mm/readahead.c:300 [inline]
 page_cache_ra_order mm/readahead.c:560 [inline]
 ondemand_readahead+0x550/0x6c0 mm/readahead.c:682
 page_cache_async_ra+0x9d/0xb0 mm/readahead.c:731
 do_async_mmap_readahead mm/filemap.c:3091 [inline]
 filemap_fault+0x375/0xb20 mm/filemap.c:3145
 __do_fault mm/memory.c:4166 [inline]
 do_shared_fault mm/memory.c:4572 [inline]
 do_fault mm/memory.c:4650 [inline]
 handle_pte_fault mm/memory.c:4934 [inline]
 __handle_mm_fault mm/memory.c:5076 [inline]
 handle_mm_fault+0x12bc/0x24d0 mm/memory.c:5222
 faultin_page mm/gup.c:926 [inline]
 __get_user_pages+0x353/0xc60 mm/gup.c:1153
 __get_user_pages_locked mm/gup.c:1373 [inline]
 __gup_longterm_locked+0x10bf/0x1430 mm/gup.c:2058
 pin_user_pages_remote+0x61/0x90 mm/gup.c:3135
 process_vm_rw_single_vec mm/process_vm_access.c:105 [inline]
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x4f2/0x8c0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x7a/0x90 mm/process_vm_access.c:298
 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 0xffff88810a969d40 of 8 bytes by task 4489 on cpu 0:
 iomap_dio_complete+0x354/0x470 fs/iomap/direct-io.c:113
 iomap_dio_rw+0x62/0x90 fs/iomap/direct-io.c:687
 ext4_dio_write_iter fs/ext4/file.c:587 [inline]
 ext4_file_write_iter+0xadf/0x1270 fs/ext4/file.c:698
 do_iter_write+0x418/0x700 fs/read_write.c:861
 vfs_iter_write+0x50/0x70 fs/read_write.c:902
 iter_file_splice_write+0x456/0x7d0 fs/splice.c:685
 do_splice_from fs/splice.c:763 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:930
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:885
 do_splice_direct+0x104/0x180 fs/splice.c:973
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 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: 0x00000000000002bf -> 0x00000000000002c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4489 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-05251-g5b7c4cabbb65-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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Page cache invalidation failure on direct I/O.  Possible data corruption due to collision with buffered I/O!
File: /root/syzkaller-testdir1914336800/syzkaller.6cxy3s/88/bus PID: 4489 Comm: syz-executor.3