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BUG: KCSAN: data-race in __filemap_add_folio / iomap_dio_complete

read-write to 0xffff88810affb7b0 of 8 bytes by task 7549 on cpu 0:
 __filemap_add_folio+0x379/0x6e0 mm/filemap.c:899
 filemap_add_folio+0x6b/0x150 mm/filemap.c:934
 page_cache_ra_unbounded+0x1a0/0x320 mm/readahead.c:251
 do_page_cache_ra mm/readahead.c:300 [inline]
 page_cache_ra_order mm/readahead.c:560 [inline]
 ondemand_readahead+0x541/0x6d0 mm/readahead.c:682
 page_cache_async_ra+0x8b/0xa0 mm/readahead.c:731
 do_async_mmap_readahead+0x206/0x240 mm/filemap.c:3071
 filemap_fault+0xf6/0x6a0 mm/filemap.c:3125
 __do_fault mm/memory.c:4203 [inline]
 do_shared_fault mm/memory.c:4609 [inline]
 do_fault+0x5c7/0xaf0 mm/memory.c:4687
 handle_pte_fault mm/memory.c:4955 [inline]
 __handle_mm_fault mm/memory.c:5097 [inline]
 handle_mm_fault+0x877/0xa80 mm/memory.c:5218
 faultin_page mm/gup.c:1009 [inline]
 __get_user_pages+0x32a/0xbf0 mm/gup.c:1230
 __get_user_pages_locked mm/gup.c:1434 [inline]
 __get_user_pages_remote+0x431/0x600 mm/gup.c:2187
 pin_user_pages_remote+0x5d/0x90 mm/gup.c:3245
 process_vm_rw_single_vec+0x168/0x440 mm/process_vm_access.c:105
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x3e1/0x570 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+0x76/0x90 mm/process_vm_access.c:298
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810affb7b0 of 8 bytes by task 7547 on cpu 1:
 iomap_dio_complete+0x34a/0x460 fs/iomap/direct-io.c:113
 iomap_dio_rw+0x5e/0x80 fs/iomap/direct-io.c:694
 ext4_dio_write_iter fs/ext4/file.c:587 [inline]
 ext4_file_write_iter+0xa27/0x1170 fs/ext4/file.c:698
 do_iter_write+0x494/0x750 fs/read_write.c:861
 vfs_iter_write+0x4c/0x70 fs/read_write.c:902
 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:931
 splice_direct_to_actor+0x305/0x620 fs/splice.c:886
 do_splice_direct+0xfb/0x180 fs/splice.c:974
 do_sendfile+0x3bf/0x910 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+0x10c/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000002f0 -> 0x00000000000002f5

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7547 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00307-gfe24a97cf254-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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