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BUG: KCSAN: data-race in xas_create / xas_find_marked

write to 0xffff88810669bb61 of 1 bytes by task 3416 on cpu 1:
 xas_expand lib/xarray.c:612 [inline]
 xas_create+0x656/0xbb0 lib/xarray.c:653
 xas_store+0x78/0xc90 lib/xarray.c:787
 __filemap_add_folio+0x45e/0x730 mm/filemap.c:898
 filemap_add_folio+0x70/0x160 mm/filemap.c:937
 page_cache_ra_unbounded+0x15e/0x2e0 mm/readahead.c:250
 do_page_cache_ra mm/readahead.c:299 [inline]
 force_page_cache_ra mm/readahead.c:330 [inline]
 page_cache_sync_ra+0x24b/0x2a0 mm/readahead.c:689
 page_cache_sync_readahead include/linux/pagemap.h:1283 [inline]
 filemap_get_pages+0x251/0xf90 mm/filemap.c:2497
 filemap_read+0x214/0x680 mm/filemap.c:2593
 blkdev_read_iter+0x217/0x2c0 block/fops.c:757
 call_read_iter include/linux/fs.h:2079 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x34c/0x480 fs/read_write.c:476
 ksys_read+0xeb/0x1a0 fs/read_write.c:619
 __do_sys_read fs/read_write.c:629 [inline]
 __se_sys_read fs/read_write.c:627 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:627
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88810669bb61 of 1 bytes by task 47 on cpu 0:
 xas_find_marked+0x419/0x660 lib/xarray.c:1338
 find_get_entry+0x5d/0x290 mm/filemap.c:1960
 filemap_get_folios_tag+0x136/0x210 mm/filemap.c:2210
 write_cache_pages+0x20d/0x740 mm/page-writeback.c:2429
 blkdev_writepages+0x59/0x90 block/fops.c:426
 do_writepages+0x1c2/0x340 mm/page-writeback.c:2553
 __writeback_single_inode+0x91/0x860 fs/fs-writeback.c:1625
 writeback_sb_inodes+0x514/0xad0 fs/fs-writeback.c:1916
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:1987
 wb_writeback+0x264/0x6e0 fs/fs-writeback.c:2094
 wb_check_background_flush fs/fs-writeback.c:2164 [inline]
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0x67f/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0x17 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 47 Comm: kworker/u4:3 Not tainted 6.7.0-syzkaller-01367-g35f11a3710cd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: writeback wb_workfn (flush-7:2)
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