Messages in this thread | | | Date | Sun, 7 Apr 2024 22:06:43 +0800 | From | "zhaowenhui (A)" <> | Subject | [bug report] WARNING: CPU: 0 PID: 49573 at kernel/sched/rt.c:802 rq_offline_rt+0x24d/0x260 |
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Hello, Recently, our machine triggered a warning in __disable_runtime. The dmesg are as follow: [ 991.697692] WARNING: CPU: 0 PID: 49573 at kernel/sched/rt.c:802 rq_offline_rt+0x24d/0x260 [ 991.697795] CPU: 0 PID: 49573 Comm: kworker/1:0 Kdump: loaded Not tainted 6.9.0-rc1+ #4 [ 991.697798] Hardware name: SuperCloud R5210 G12/X12DPi-N6, BIOS 1.1c 08/30/2021 [ 991.697800] Workqueue: events cpuset_hotplug_workfn [ 991.697803] RIP: 0010:rq_offline_rt+0x24d/0x260 [ 991.697825] Call Trace: [ 991.697827] <TASK> [ 991.697830] ? __warn+0x7c/0x130 [ 991.697835] ? rq_offline_rt+0x24d/0x260 [ 991.697837] ? report_bug+0xf8/0x1e0 [ 991.697842] ? handle_bug+0x3f/0x70 [ 991.697858] set_rq_offline.part.125+0x2d/0x70 [ 991.697864] rq_attach_root+0xda/0x110 [ 991.697867] cpu_attach_domain+0x433/0x860 [ 991.697870] ? psi_task_switch+0x11d/0x260 [ 991.697873] ? __kmalloc_node+0x1dc/0x390 [ 991.697877] ? alloc_cpumask_var_node+0x1b/0x30 [ 991.697880] partition_sched_domains_locked+0x2a8/0x3a0 [ 991.697883] ? css_next_child+0x61/0x80 [ 991.697885] rebuild_sched_domains_locked+0x608/0x800 [ 991.697890] ? percpu_rwsem_wait+0x160/0x160 [ 991.697895] rebuild_sched_domains+0x1b/0x30 [ 991.697897] cpuset_hotplug_workfn+0x4b6/0x1160 [ 991.697899] ? balance_push+0x4e/0x120 [ 991.697903] ? finish_task_switch+0x8d/0x2d0 [ 991.697905] ? __switch_to+0x126/0x4f0 [ 991.697909] process_scheduled_works+0xad/0x430 [ 991.697917] worker_thread+0x105/0x270 [ 991.697922] kthread+0xde/0x110 [ 991.697928] ret_from_fork+0x2d/0x50 [ 991.697935] ret_from_fork_asm+0x11/0x20 [ 991.697940] </TASK> [ 991.697941] ---[ end trace 0000000000000000 ]---
The corresponding code is : 802 WARN_ON_ONCE(want); Because this WARN_ON_ONCE hasn’t changed from BUG_ON under linux-6.1, it will trigger panic in those version.
More information: 1. RT_RUNTIME_SHARE is enabled. 2. We continuously create and remove cpu cgroups. We use cgexec to do some tasks like "tree" or "ps" in these cgroups and the rt_runtime_us in these cgroups are set to 2000~6000. 3. There are frequent cpu offline/online operations, so it will trigger __disable_runtime.
Every time we run these operations after reboot, this warning will happen easily.
--- Regards Zhao Wenhui
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