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BUG: KCSAN: data-race in __filemap_add_folio / file_write_and_wait_range

read-write to 0xffff88810ada08f0 of 8 bytes by task 25273 on cpu 0:
 __filemap_add_folio+0x379/0x6e0 mm/filemap.c:900
 filemap_add_folio+0x6b/0x150 mm/filemap.c:935
 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:3090
 filemap_fault+0xf6/0x6a0 mm/filemap.c:3144
 __do_fault mm/memory.c:4163 [inline]
 do_shared_fault mm/memory.c:4569 [inline]
 do_fault+0x5c7/0xaf0 mm/memory.c:4647
 handle_pte_fault mm/memory.c:4931 [inline]
 __handle_mm_fault mm/memory.c:5073 [inline]
 handle_mm_fault+0x8c5/0xb20 mm/memory.c:5219
 faultin_page mm/gup.c:926 [inline]
 __get_user_pages+0x348/0xc20 mm/gup.c:1153
 __get_user_pages_locked mm/gup.c:1373 [inline]
 __gup_longterm_locked+0xcc3/0xf20 mm/gup.c:2058
 pin_user_pages_remote+0x5d/0x90 mm/gup.c:3135
 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 0xffff88810ada08f0 of 8 bytes by task 25268 on cpu 1:
 mapping_needs_writeback mm/filemap.c:624 [inline]
 file_write_and_wait_range+0x66/0x190 mm/filemap.c:776
 ext4_sync_file+0x105/0x6d0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2882 [inline]
 iomap_dio_complete+0x3e7/0x460 fs/iomap/direct-io.c:128
 iomap_dio_rw+0x5e/0x80 fs/iomap/direct-io.c:693
 ext4_dio_write_iter fs/ext4/file.c:587 [inline]
 ext4_file_write_iter+0xa36/0x11b0 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: 0x0000000000000330 -> 0x0000000000000333

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25268 Comm: syz-executor.5 Tainted: G        W          6.2.0-rc2-syzkaller-00203-g1f5abbd77e2c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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