================================================================== BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked write to 0xffff88815649ed70 of 8 bytes by interrupt on cpu 0: instrument_write include/linux/instrumented.h:42 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [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:911 [inline] __xa_clear_mark+0x1d9/0x2c0 lib/xarray.c:1917 test_clear_page_writeback+0x23e/0x560 mm/page-writeback.c:2736 end_page_writeback+0xd7/0x1b0 mm/filemap.c:1548 page_endio+0x1cc/0x280 mm/filemap.c:1580 mpage_end_io+0x186/0x1d0 fs/mpage.c:54 bio_endio+0x21d/0x300 block/bio.c:1414 req_bio_endio block/blk-core.c:265 [inline] blk_update_request+0x435/0xa30 block/blk-core.c:1454 blk_mq_end_request+0x22/0x50 block/blk-mq.c:565 lo_complete_rq+0xca/0x170 drivers/block/loop.c:498 blk_complete_reqs block/blk-mq.c:577 [inline] blk_done_softirq+0x69/0x90 block/blk-mq.c:582 __do_softirq+0x12c/0x275 kernel/softirq.c:559 run_ksoftirqd+0x13/0x20 kernel/softirq.c:921 smpboot_thread_fn+0x2a1/0x3f0 kernel/smpboot.c:165 kthread+0x1d0/0x1f0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff88815649ed70 of 8 bytes by task 1774 on cpu 1: xas_find_chunk include/linux/xarray.h:1662 [inline] xas_find_marked+0x195/0x5f0 lib/xarray.c:1349 find_get_entry mm/filemap.c:1925 [inline] find_get_pages_range_tag+0xf2/0x390 mm/filemap.c:2216 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1123 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:510 filemap_fdatawait_keep_errors+0x24/0x80 mm/filemap.c:613 wait_sb_inodes fs/fs-writeback.c:2458 [inline] sync_inodes_sb+0x3f6/0x4d0 fs/fs-writeback.c:2580 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem+0xe4/0x160 fs/sync.c:67 generic_shutdown_super+0x42/0x230 fs/super.c:448 kill_block_super+0x4a/0x90 fs/super.c:1395 deactivate_locked_super+0x65/0xd0 fs/super.c:335 deactivate_super+0x85/0x90 fs/super.c:366 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1136 __cleanup_mnt+0x15/0x20 fs/namespace.c:1143 task_work_run+0xae/0x130 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xfffffffffffffc00 -> 0xfffffffff0000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1774 Comm: syz-executor.4 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================