================================================================== BUG: KCSAN: data-race in percpu_counter_add_batch / wb_over_bg_thresh write to 0xffff88809997d068 of 8 bytes by task 11453 on cpu 1: percpu_counter_add_batch+0xca/0x150 lib/percpu_counter.c:91 __add_wb_stat include/linux/backing-dev.h:73 [inline] inc_wb_stat include/linux/backing-dev.h:78 [inline] account_page_dirtied+0x1f1/0x4a0 mm/page-writeback.c:2427 __set_page_dirty+0x8a/0x270 fs/buffer.c:623 mark_buffer_dirty+0x27f/0x2c0 fs/buffer.c:1152 __block_commit_write.isra.0+0x11f/0x170 fs/buffer.c:2081 block_write_end+0x6d/0x140 fs/buffer.c:2159 generic_write_end+0x8a/0x1f0 fs/buffer.c:2173 ext4_da_write_end+0x158/0x620 fs/ext4/inode.c:3091 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 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 read to 0xffff88809997d068 of 8 bytes by task 660 on cpu 0: wb_stat include/linux/backing-dev.h:88 [inline] wb_over_bg_thresh+0x247/0x490 mm/page-writeback.c:1948 wb_writeback+0x4bc/0x6a0 fs/fs-writeback.c:1873 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 660 Comm: kworker/u4:3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================