<div dir="ltr"><div>Hello,</div><div><br></div>It's always related to swapper and ksoftirqd:<div><br></div><div>Some examples here: <a href="https://pastebin.com/wn0nCwce">https://pastebin.com/wn0nCwce</a></div><div><br></div><div>Karl</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 30, 2019 at 3:11 PM Vasily Averin <<a href="mailto:vvs@virtuozzo.com">vvs@virtuozzo.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear Karl,<br>
thank you for reporting the problem.<br>
<br>
no, it is not known issue.<br>
moreover, I doubt it is related to real hardware interrupts,<br>
soft-interrupts handles delayed procedures like processing of network packets.<br>
<br>
For troubleshooting is to look at stack of affected running processes via /proc/<pid>/stack<br>
alternatively you can use magic sysrq key<br>
# echo l > /proc/sysrq-trigger <br>
it should dump current state of all running processors.<br>
you can do it few times to monitor state of affected processes.<br>
<br>
Thank you,<br>
Vasily Averin<br>
<br>
<br>
On 5/30/19 7:54 PM, Karl Johnson wrote:<br>
> Hello,<br>
> <br>
> I've upgraded from 2.6.32-042stab133.2 to 2.6.32-042stab138.1 and since boot, 2 cores are using 100% cpu on ksoftirqd:<br>
> <br>
> root 21 99.9 0.0 0 0 ? R May29 1178:07 \_ [ksoftirqd/4]<br>
> root 25 99.9 0.0 0 0 ? R May29 1177:51 \_ [ksoftirqd/5]<br>
> <br>
> From /proc/interrupts I can see that it's caused by IR-IO-APIC-edge timer:<br>
> <br>
> CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 <br>
> 0: 136922 103603 26928 27528 112318229 71888343 73755 285735 IR-IO-APIC-edge timer<br>
> <br>
> kernel /vmlinuz-2.6.32-042stab138.1 ro root=UUID=7367aa0f-8216-44ca-9cc4-affed22bbd9c rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM nohz=off nopti<br>
> <br>
> Any way to troubleshoot this? Is it a known issue?<br>
> <br>
> Karl<br>
> <br>
> <br>
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</blockquote></div>