syzbot

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BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked

read-write to 0xffff888122e456b0 of 8 bytes by task 44 on cpu 0:
 instrument_read_write include/linux/instrumented.h:57 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:81 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:915 [inline]
 __xa_clear_mark+0x1b6/0x2d0 lib/xarray.c:1923
 __folio_end_writeback+0x26b/0x540 mm/page-writeback.c:2805
 folio_end_writeback+0x57/0x130 mm/filemap.c:1646
 end_page_writeback+0x3b/0xe0 mm/folio-compat.c:26
 ext4_finish_bio+0x421/0x520 fs/ext4/page-io.c:145
 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:160
 ext4_end_io_end fs/ext4/page-io.c:194 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x319/0x3a0 fs/ext4/page-io.c:273
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff888122e456b0 of 8 bytes by task 4102 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1688 [inline]
 xas_find_marked+0x195/0x5e0 lib/xarray.c:1355
 find_get_entry mm/filemap.c:2032 [inline]
 find_get_pages_range_tag+0x103/0x480 mm/filemap.c:2314
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122
 __filemap_fdatawait_range+0xba/0x260 mm/filemap.c:516
 filemap_fdatawait_range mm/filemap.c:551 [inline]
 filemap_write_and_wait_range+0x14d/0x2e0 mm/filemap.c:682
 ext4_punch_hole+0xaf/0x7c0 fs/ext4/inode.c:3986
 ext4_fallocate+0x1f6/0x440 fs/ext4/extents.c:4703
 vfs_fallocate+0x355/0x3d0 fs/open.c:308
 do_vfs_ioctl+0x12d9/0x1390 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x83/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 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+0x46/0xb0

value changed: 0xfffffffff0000000 -> 0xffffffff00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4102 Comm: syz-executor.3 Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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