================================================================== BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked read-write to 0xffff8881065d1468 of 8 bytes by task 10270 on cpu 1: 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+0x90/0x180 lib/xarray.c:915 __folio_start_writeback+0x2d9/0x430 mm/page-writeback.c:3164 __block_write_full_folio+0x506/0x8c0 fs/buffer.c:1899 block_write_full_folio+0x293/0x2b0 write_cache_pages+0x62/0x100 mm/page-writeback.c:2665 blkdev_writepages+0x59/0x90 block/fops.c:458 do_writepages+0x1d8/0x480 mm/page-writeback.c:2708 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] __filemap_fdatawrite mm/filemap.c:428 [inline] filemap_flush+0xe7/0x120 mm/filemap.c:455 sync_blockdev_nowait+0x29/0x40 block/bdev.c:206 sync_filesystem+0xe3/0x190 fs/sync.c:60 generic_shutdown_super+0x46/0x220 fs/super.c:621 kill_block_super+0x2a/0x70 fs/super.c:1710 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7368 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473 deactivate_super+0x9f/0xb0 fs/super.c:506 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1413 __cleanup_mnt+0x19/0x20 fs/namespace.c:1420 task_work_run+0x13a/0x1a0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881065d1468 of 8 bytes by task 6399 on cpu 0: xas_find_chunk include/linux/xarray.h:1733 [inline] xas_find_marked+0x216/0x660 lib/xarray.c:1370 find_get_entry+0x54/0x390 mm/filemap.c:1985 filemap_get_folios_tag+0x9e/0x210 mm/filemap.c:2252 writeback_get_folio mm/page-writeback.c:2514 [inline] writeback_iter+0x4b0/0x830 mm/page-writeback.c:2615 write_cache_pages+0x4b/0x100 mm/page-writeback.c:2664 blkdev_writepages+0x59/0x90 block/fops.c:458 do_writepages+0x1d8/0x480 mm/page-writeback.c:2708 __writeback_single_inode+0x89/0x850 fs/fs-writeback.c:1680 writeback_sb_inodes+0x461/0xa30 fs/fs-writeback.c:1976 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:2047 wb_writeback+0x274/0x640 fs/fs-writeback.c:2158 wb_check_background_flush fs/fs-writeback.c:2228 [inline] wb_do_writeback fs/fs-writeback.c:2316 [inline] wb_workfn+0x67f/0x940 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3317 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398 kthread+0x4ae/0x520 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 value changed: 0x000000000000010f -> 0x000000000000010c Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 6399 Comm: kworker/u8:9 Not tainted 6.13.0-syzkaller-07259-g0f8e26b38d7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: writeback wb_workfn (flush-7:5) ==================================================================