==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / file_write_and_wait_range

read-write to 0xffff88810a1b5830 of 8 bytes by task 4860 on cpu 0:
 __filemap_add_folio+0x38c/0x720 mm/filemap.c:904
 filemap_add_folio+0x6f/0x150 mm/filemap.c:939
 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:3218 [inline]
 filemap_fault+0x375/0xb20 mm/filemap.c:3272
 __do_fault mm/memory.c:4155 [inline]
 do_shared_fault mm/memory.c:4561 [inline]
 do_fault mm/memory.c:4639 [inline]
 handle_pte_fault mm/memory.c:4923 [inline]
 __handle_mm_fault mm/memory.c:5065 [inline]
 handle_mm_fault+0x1247/0x21d0 mm/memory.c:5211
 faultin_page mm/gup.c:925 [inline]
 __get_user_pages+0x363/0xc30 mm/gup.c:1147
 __get_user_pages_locked mm/gup.c:1381 [inline]
 __gup_longterm_locked+0x112d/0x13b0 mm/gup.c:2079
 pin_user_pages_remote+0x9f/0xd0 mm/gup.c:3122
 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 0xffff88810a1b5830 of 8 bytes by task 4859 on cpu 1:
 mapping_needs_writeback mm/filemap.c:628 [inline]
 file_write_and_wait_range+0x6a/0x190 mm/filemap.c:780
 ext4_sync_file+0x10d/0x720 fs/ext4/fsync.c:151
 vfs_fsync_range+0x10b/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2452 [inline]
 iomap_dio_complete+0x3f1/0x470 fs/iomap/direct-io.c:128
 iomap_dio_rw+0x62/0x90 fs/iomap/direct-io.c:687
 ext4_dio_write_iter fs/ext4/file.c:597 [inline]
 ext4_file_write_iter+0x9e6/0x10e0 fs/ext4/file.c:708
 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:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1022
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:977
 do_splice_direct+0x104/0x180 fs/splice.c:1065
 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: 0x00000000000003df -> 0x00000000000003e5

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4859 Comm: syz-executor.1 Not tainted 6.3.0-rc6-syzkaller-00138-g44149752e998 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
==================================================================