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================================================================== BUG: KCSAN: data-race in __wb_update_bandwidth / percpu_counter_add_batch write to 0xffff888100fa7940 of 8 bytes by task 1914 on cpu 1: percpu_counter_add_batch+0x9c/0xd0 lib/percpu_counter.c:91 __add_wb_stat include/linux/backing-dev.h:70 [inline] inc_wb_stat include/linux/backing-dev.h:75 [inline] __wb_writeout_inc mm/page-writeback.c:592 [inline] test_clear_page_writeback+0x34d/0x560 mm/page-writeback.c:2754 end_page_writeback+0xd7/0x1b0 mm/filemap.c:1548 ext4_finish_bio+0x3e2/0x430 fs/ext4/page-io.c:143 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:158 ext4_end_io_end fs/ext4/page-io.c:192 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:257 [inline] ext4_end_io_rsv_work+0x306/0x360 fs/ext4/page-io.c:271 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 read to 0xffff888100fa7940 of 8 bytes by task 1897 on cpu 0: percpu_counter_read include/linux/percpu_counter.h:72 [inline] __wb_update_bandwidth+0x9f/0x480 mm/page-writeback.c:1353 wb_update_bandwidth+0x4e/0x70 mm/page-writeback.c:1387 wb_writeback+0x421/0x700 fs/fs-writeback.c:2056 wb_check_old_data_flush fs/fs-writeback.c:2155 [inline] wb_do_writeback+0x461/0x510 fs/fs-writeback.c:2208 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2237 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 value changed: 0x0000000000000b90 -> 0x0000000000000ba0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1897 Comm: kworker/u4:6 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/07/31 14:48 | upstream | c7d102232649 | 6c236867 | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in __wb_update_bandwidth / percpu_counter_add_batch | |||
2021/07/28 21:49 | upstream | 4010a528219e | 9a4781d4 | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in __wb_update_bandwidth / percpu_counter_add_batch | |||
2021/06/27 21:40 | upstream | b4b27b9eed8e | 9d2ab5df | .config | console log | report | info | ci2-upstream-kcsan-gce | KCSAN: data-race in __wb_update_bandwidth / percpu_counter_add_batch |