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BUG: KCSAN: data-race in xas_find_marked / xas_init_marks

read-write to 0xffff888108ff5d98 of 8 bytes by task 23677 on cpu 0:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
 node_clear_mark lib/xarray.c:102 [inline]
 xas_clear_mark lib/xarray.c:914 [inline]
 xas_init_marks+0x17e/0x320 lib/xarray.c:947
 xas_store+0x216/0xc90 lib/xarray.c:809
 page_cache_delete_batch mm/filemap.c:312 [inline]
 delete_from_page_cache_batch+0x33e/0x710 mm/filemap.c:334
 truncate_inode_pages_range+0x1bd/0x6a0 mm/truncate.c:359
 truncate_pagecache_range+0x84/0x90 mm/truncate.c:846
 ext4_punch_hole+0x354/0x7e0 fs/ext4/inode.c:3960
 ext4_fallocate+0x209/0x1180 fs/ext4/extents.c:4741
 vfs_fallocate+0x378/0x3e0 fs/open.c:328
 madvise_remove mm/madvise.c:1001 [inline]
 madvise_vma_behavior mm/madvise.c:1025 [inline]
 madvise_walk_vmas mm/madvise.c:1260 [inline]
 do_madvise+0x743/0x25e0 mm/madvise.c:1440
 __do_sys_madvise mm/madvise.c:1453 [inline]
 __se_sys_madvise mm/madvise.c:1451 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1451
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888108ff5d98 of 8 bytes by task 13360 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1723 [inline]
 xas_find_marked+0x216/0x660 lib/xarray.c:1354
 find_get_entry+0x5d/0x290 mm/filemap.c:1961
 filemap_get_folios_tag+0x136/0x210 mm/filemap.c:2211
 mpage_prepare_extent_to_map+0x321/0xb70 fs/ext4/inode.c:2392
 ext4_do_writepages+0x6ea/0x2100 fs/ext4/inode.c:2632
 ext4_writepages+0x15e/0x2e0 fs/ext4/inode.c:2768
 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
 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2092
 wb_do_writeback fs/fs-writeback.c:2239 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 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: 0xffffffffe0000000 -> 0xfffffffc00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13360 Comm: kworker/u4:7 Not tainted 6.8.0-rc3-syzkaller-00005-g99bd3cb0d12e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: writeback wb_workfn (flush-8:0)
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