当你在Linux系统中看到类似于”rcu_sched detected stalls on CPUs/tasks”的错误消息时,这表示系统检测到了针对RCU(Read-Copy-Update)机制的延迟。RCU是一种用于实现读写并发性的技术,在内核中广泛使用。 这个错误通常意味着在进行RCU更新时,某些CPU或任务被阻塞了较长时间,导致系统性能下降或出现其他问题。可能会...
有一份SDK,之前跑在PPC405EX上没问题。最近换平台,CPU使用了PowerPC的P1020,双核。 linux版本也升级到了3.0.48版本。升级之后出现了一个问题:SDK里面的程序跑一段时间之后会报告: INFO: rcu_sched_state detected stalls on CPUs/tasks: { 1} (detected by 0, t=15002 jiffies)。意思是CORE0检测到CORE1挂...
<3>[20803.847018] INFO: rcu_sched detected stalls on CPUs/tasks:<3>[20803.847051] 1: (1 GPs behind) idle=369/140000000000000/0 softirq=593036/593037 fqs=215772 <3>[20803.847060] (detected by 3, t=241692 jiffies, g=450146, c=450145, q=47215)<6>[20803.847075] Task dump for CPU 1:<...
NFO: rcu_sched_state detected stalls on CPUs/tasks: {15 } (detected by 4, 6002 jiffies,其余信息省略) 该环境没有开启rcu的callback线程,也就是rcu是在软中断中处理。 获取信息发现,有一个核的rcu的qlen已经达到了几百万,而且维持不变,也就是,既没有新的rcu挂在这个核,也没见这个核处理rcu。 查看...
"rcu: INFO: rcu_sched detected stalls on CPU/tasks: " and a lot of other info, then i have to do another shutdown command to actually shut down the docker. Strange thing is that after i start it again and go to log i can see that all the sensors and switches wore working wile ...
[ 310.136842] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 310.142811] rcu: 3-...0: (1 ticks this GP) idle=572/1/0x4000000000000000 softirq=5076/5076 fqs=6244 [ 310.152081] (detected by 2, t=14713 jiffies, g=7101, q=178) ...
INFO: rcu_tasks detected stalls on tasks: 之后是sched_show_task()打印每个在本次宽限期超时的rcu相关task的调用栈等信息。 3 Interpreting RCU's CPU Stall-Detector "Splats" 172 For non-RCU-tasks flavors of RCU, when a CPU detects that it is stalling, 173 it will print a message similar ...
INFO: rcu_sched_state detected stall on CPU 5 (t=2500 jiffies) INFO: rcu_bh_state detected stalls on CPUs/tasks: { 3 5 } (detected by 2, 2502 jiffies) 它们来自RCU CPU Stall Detector,要了解RCU CPU Stall Detector是什么,首先要知道RCU是什么。RCU(Read-Copy Update) 是Linux 2.6 内核开始引...
并继续为每个暂停当前 RCU 任务宽限期的任务输出 sched_show_task()。 解释RCU’s CPU Stall-Detector“Splats” 对于RCU 的非 RCU 任务风格,当一个 CPU 检测到某个其他 CPU 正在停止时,它将打印类似于以下内容的消息: INFO:rcu_scheddetected stalls on CPUs/tasks: ...
I'm getting "rcu_sched self-detected stall on CPU" errors in every VM at startup, and then if the VM's are under a heavy load, the proxmox host machine will also lockup and begin saying the same message. I'm not sure even how to figure out my root cause. Numerous google have ...