================================================================== BUG: KCSAN: data-race in balance_dirty_pages / percpu_counter_add_batch write to 0xffff8881221b7068 of 8 bytes by task 8221 on cpu 0: percpu_counter_add_batch+0xca/0x150 lib/percpu_counter.c:91 __add_wb_stat include/linux/backing-dev.h:73 [inline] dec_wb_stat include/linux/backing-dev.h:83 [inline] clear_page_dirty_for_io+0x4c0/0x580 mm/page-writeback.c:2704 mpage_submit_page+0x6d/0x1a0 fs/ext4/inode.c:2055 mpage_map_and_submit_buffers+0x3c4/0x6c0 fs/ext4/inode.c:2319 mpage_map_and_submit_extent fs/ext4/inode.c:2458 [inline] ext4_writepages+0x1449/0x2500 fs/ext4/inode.c:2771 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __writeback_single_inode+0xaf/0x8e0 fs/fs-writeback.c:1452 writeback_sb_inodes+0x4ba/0xa50 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1785 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1894 wb_check_background_flush fs/fs-writeback.c:1962 [inline] wb_do_writeback fs/fs-writeback.c:2050 [inline] wb_workfn+0x696/0x970 fs/fs-writeback.c:2078 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264 worker_thread+0xa0/0x800 kernel/workqueue.c:2410 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff8881221b7068 of 8 bytes by task 6045 on cpu 1: wb_stat include/linux/backing-dev.h:88 [inline] wb_dirty_limits mm/page-writeback.c:1549 [inline] balance_dirty_pages+0x105d/0x1ba0 mm/page-writeback.c:1677 balance_dirty_pages_ratelimited+0x703/0xa30 mm/page-writeback.c:1913 generic_perform_write+0x22d/0x320 mm/filemap.c:3345 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6045 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================