================================================================== BUG: KCSAN: data-race in balance_dirty_pages / percpu_counter_add_batch write to 0xffff8880ab727890 of 8 bytes by interrupt on cpu 1: 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] test_clear_page_writeback+0x4d1/0x790 mm/page-writeback.c:2736 end_page_writeback+0x9e/0x190 mm/filemap.c:1338 ext4_finish_bio+0x40d/0x520 fs/ext4/page-io.c:110 ext4_end_bio+0xd2/0x310 fs/ext4/page-io.c:334 bio_endio+0x3a8/0x4f0 block/bio.c:1818 req_bio_endio block/blk-core.c:242 [inline] blk_update_request+0x427/0x7b0 block/blk-core.c:1462 scsi_end_request+0x6b/0x3e0 drivers/scsi/scsi_lib.c:579 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:963 scsi_finish_command+0x280/0x380 drivers/scsi/scsi.c:228 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1477 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 read to 0xffff8880ab727890 of 8 bytes by task 11843 on cpu 0: wb_stat include/linux/backing-dev.h:88 [inline] wb_dirty_limits mm/page-writeback.c:1550 [inline] balance_dirty_pages+0x106d/0x1ba0 mm/page-writeback.c:1677 balance_dirty_pages_ratelimited+0x752/0xb40 mm/page-writeback.c:1913 generic_perform_write+0x22d/0x320 mm/filemap.c:3340 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3433 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268 call_write_iter include/linux/fs.h:1895 [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/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11843 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================