[Bug 1220085] New: Data races reported by KCSAN on s390x
https://bugzilla.suse.com/show_bug.cgi?id=1220085 Bug ID: 1220085 Summary: Data races reported by KCSAN on s390x Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: S/390-64 OS: Linux Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: miroslav.franc@suse.com Reporter: miroslav.franc@suse.com QA Contact: qa-bugs@suse.de CC: ihno@suse.com, marcela.maslanova@suse.com, ro@suse.com Target Milestone: --- Found By: --- Blocker: --- Created attachment 872851 --> https://bugzilla.suse.com/attachment.cgi?id=872851&action=edit dmesg log from s390x VM z15 factory KCSAN enabled kernel* on s390x reports a lot of data races. See the dmesg log for details. * https://download.suse.de/ibs/home:/mfranc:/branches:/SUSE:/Factory:/Head:/ke... -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 https://bugzilla.suse.com/show_bug.cgi?id=1220085#c1 --- Comment #1 from Miroslav Franc <miroslav.franc@suse.com> --- BUG: KCSAN: data-race in arch_vcpu_is_preempted+0x4a/0xe0 BUG: KCSAN: data-race in atime_needs_update / inode_update_timestamps BUG: KCSAN: data-race in begin_new_exec / wait_consider_task BUG: KCSAN: data-race in blk_mq_delay_run_hw_queue / blk_mq_delay_run_hw_queue BUG: KCSAN: data-race in btrfs_block_rsv_release [btrfs] / need_preemptive_reclaim [btrfs] BUG: KCSAN: data-race in btrfs_record_root_in_trans [btrfs] / record_root_in_trans [btrfs] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs] BUG: KCSAN: data-race in capable / vtime_account_kernel BUG: KCSAN: data-race in common_perm_cond / kernfs_refresh_inode BUG: KCSAN: data-race in copy_from_read_buf / n_tty_receive_buf_common BUG: KCSAN: data-race in d_alloc_parallel / d_alloc_parallel BUG: KCSAN: data-race in do_epoll_ctl / ep_poll_callback BUG: KCSAN: data-race in __flush_work.isra.0 / queue_work_on BUG: KCSAN: data-race in __fput / kernfs_refresh_inode BUG: KCSAN: data-race in generic_fillattr / kernfs_refresh_inode BUG: KCSAN: data-race in __hrtimer_run_queues / hrtimer_active BUG: KCSAN: data-race in inode_permission / kernfs_refresh_inode BUG: KCSAN: data-race in kernfs_refresh_inode / kernfs_refresh_inode BUG: KCSAN: data-race in kernfs_refresh_inode / link_path_walk.part.0.constprop.0 BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_advance BUG: KCSAN: data-race in n_tty_check_unthrottle / n_tty_receive_buf_common BUG: KCSAN: data-race in n_tty_poll / n_tty_receive_buf_common BUG: KCSAN: data-race in n_tty_read / n_tty_receive_buf_common BUG: KCSAN: data-race in osq_lock / osq_lock BUG: KCSAN: data-race in osq_lock / osq_unlock BUG: KCSAN: data-race in pipe_poll / pipe_write BUG: KCSAN: data-race in pipe_read / pipe_release BUG: KCSAN: data-race in pipe_read / pipe_write BUG: KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake BUG: KCSAN: data-race in queue_work_on / worker_thread BUG: KCSAN: data-race in rcu_all_qs / rcu_exp_need_qs BUG: KCSAN: data-race in rcu_all_qs / rcu_implicit_dynticks_qs BUG: KCSAN: data-race in rcu_all_qs / rcu_report_qs_rdp BUG: KCSAN: data-race in set_nlink / set_nlink BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer BUG: KCSAN: data-race in wq_worker_tick / wq_worker_tick -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 https://bugzilla.suse.com/show_bug.cgi?id=1220085#c2 --- Comment #2 from Miroslav Franc <miroslav.franc@suse.com> --- The previous list of reported data races was from booting the machine. The following is from running valgrind testsuite. BUG: KCSAN: data-race in __count_memcg_events / mem_cgroup_css_rstat_flush BUG: KCSAN: data-race in __d_add / __d_add BUG: KCSAN: data-race in __flush_work.isra.0 / queue_work_on BUG: KCSAN: data-race in __hrtimer_run_queues / hrtimer_active BUG: KCSAN: data-race in __mod_lruvec_page_state / filemap_fault BUG: KCSAN: data-race in __mod_lruvec_page_state / folio_batch_move_lru BUG: KCSAN: data-race in __mod_lruvec_page_state / lru_add_fn BUG: KCSAN: data-race in __mod_lruvec_page_state / next_uptodate_folio BUG: KCSAN: data-race in __mod_memcg_lruvec_state / __mod_memcg_lruvec_state BUG: KCSAN: data-race in __mod_memcg_lruvec_state / mem_cgroup_css_rstat_flush BUG: KCSAN: data-race in __mod_memcg_lruvec_state / memcg_account_kmem BUG: KCSAN: data-race in __mod_zone_page_state / memchr_inv BUG: KCSAN: data-race in __napi_schedule_irqoff / net_rx_action BUG: KCSAN: data-race in _find_next_and_bit+0x50/0x130 BUG: KCSAN: data-race in acct_account_cputime / do_brk_flags BUG: KCSAN: data-race in alloc_empty_file / percpu_counter_add_batch BUG: KCSAN: data-race in alloc_pid / copy_process BUG: KCSAN: data-race in arch_vcpu_is_preempted+0x4a/0xe0 BUG: KCSAN: data-race in atime_needs_update / xfs_vn_update_time [xfs] BUG: KCSAN: data-race in begin_new_exec / vtime_account_kernel BUG: KCSAN: data-race in bio_chain / bio_endio BUG: KCSAN: data-race in blk_mq_delay_run_hw_queue / blk_mq_delay_run_hw_queue BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_hctx_has_pending BUG: KCSAN: data-race in copy_from_read_buf / n_tty_receive_buf_common BUG: KCSAN: data-race in copy_process / vtime_account_kernel BUG: KCSAN: data-race in d_alloc / lockref_put_return BUG: KCSAN: data-race in dasd_block_tasklet [dasd_mod] / dasd_start_IO [dasd_mod] BUG: KCSAN: data-race in do_execveat_common.isra.0 / vtime_account_kernel BUG: KCSAN: data-race in do_exit / zap_other_threads BUG: KCSAN: data-race in do_flush_stats / tick_do_update_jiffies64 BUG: KCSAN: data-race in do_nanosleep / hrtimer_wakeup BUG: KCSAN: data-race in dput / lockref_get_not_dead BUG: KCSAN: data-race in exit_signals / vtime_account_kernel BUG: KCSAN: data-race in folio_activate_fn / unmap_page_range BUG: KCSAN: data-race in inode_needs_update_time / inode_update_timestamps BUG: KCSAN: data-race in inode_update_timestamps / inode_update_timestamps BUG: KCSAN: data-race in kthread_is_per_cpu / xfs_trans_free [xfs] BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_advance BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance BUG: KCSAN: data-race in link_path_walk.part.0.constprop.0 / page_get_link BUG: KCSAN: data-race in mas_wr_slot_store / mtree_range_walk BUG: KCSAN: data-race in n_tty_check_unthrottle / n_tty_receive_buf_common BUG: KCSAN: data-race in n_tty_poll / n_tty_receive_buf_common BUG: KCSAN: data-race in n_tty_read / n_tty_receive_buf_common BUG: KCSAN: data-race in osq_lock / osq_lock BUG: KCSAN: data-race in osq_lock / osq_unlock BUG: KCSAN: data-race in page_get_link / page_get_link BUG: KCSAN: data-race in pipe_read / pipe_read BUG: KCSAN: data-race in pipe_read / pipe_release BUG: KCSAN: data-race in pipe_read / pipe_write BUG: KCSAN: data-race in poll_schedule_timeout.constprop.0 / pollwake BUG: KCSAN: data-race in process_one_work / process_one_work BUG: KCSAN: data-race in process_one_work / queue_work_on BUG: KCSAN: data-race in queue_work_on / worker_thread BUG: KCSAN: data-race in raw3215_irq / tty3215_write_room BUG: KCSAN: data-race in rcu_all_qs / rcu_implicit_dynticks_qs BUG: KCSAN: data-race in rcu_all_qs / rcu_report_qs_rdp BUG: KCSAN: data-race in release_task+0x1fe/0xb28 BUG: KCSAN: data-race in release_task+0x20e/0xb28 BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer BUG: KCSAN: data-race in vtime_account_kernel / xfs_end_ioend [xfs] BUG: KCSAN: data-race in vtime_account_kernel / xfs_prepare_ioend [xfs] BUG: KCSAN: data-race in vtime_account_kernel / xfs_trans_alloc [xfs] BUG: KCSAN: data-race in vtime_account_kernel / xfs_trans_free [xfs] BUG: KCSAN: data-race in xa_get_order / xas_store BUG: KCSAN: data-race in xas_clear_mark / xas_find_marked -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 https://bugzilla.suse.com/show_bug.cgi?id=1220085#c3 --- Comment #3 from Miroslav Franc <miroslav.franc@suse.com> --- Created attachment 872854 --> https://bugzilla.suse.com/attachment.cgi?id=872854&action=edit dmesg log from s390x VM z15 factory (valgrind regtest) -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 Miroslav Franc <miroslav.franc@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #872851|text/x-log |text/plain mime type| | -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 https://bugzilla.suse.com/show_bug.cgi?id=1220085#c4 --- Comment #4 from Sarah Kriesch <ada.lovelace@gmx.de> --- Should that be forwarded to IBM? -- You are receiving this mail because: You are on the CC list for the bug.
https://bugzilla.suse.com/show_bug.cgi?id=1220085 https://bugzilla.suse.com/show_bug.cgi?id=1220085#c5 --- Comment #5 from Miroslav Franc <miroslav.franc@suse.com> --- (In reply to Sarah Kriesch from comment #4)
Should that be forwarded to IBM?
As far as I remember, IBM is aware. KCSAN practically doesn't work on s390x, i.e. shows way too many false positives. I hit this when I tried to debug certain memory issues on a LinuxONE machine. It's definitely on my radar, but I don't think it's a priority for anybody right now. However, it's a real problem, so I don't want to close the bug without any meaningful resolution. At the same time I doubt it will be fixed anytime soon. -- You are receiving this mail because: You are on the CC list for the bug.
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