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IDProjectCategoryView StatusLast Update
0016434CentOS-7libvirtpublic2019-09-22 10:24
Reporterit72rc 
PrioritynormalSeveritycrashReproducibilityalways
Status newResolutionopen 
Product Version7.7-1908 
Target VersionFixed in Version 
Summary0016434: CentOs 5.11 VM lost network connection on 7.7 KVM host
DescriptionHi,

I have a centOs 5.11 VM (krn 2.6.18-419) with 1-socket/6-core/1-thread which lost network
connectivity after boot (no logs info, eth0 seem ok but no packets flows).

Please note that the problem seem to not appear with 2-core (but I haven't check it for long
uptime).

TIA
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Activities

it72rc

it72rc

2019-09-21 07:20

reporter   ~0035178

Update: also with two cores VM goes off line. Only with one core it remain online.

Try changing IRQ affinity for network card bring VM instantly offline.
it72rc

it72rc

2019-09-21 07:49

reporter   ~0035179

Update-2: it seem that disabling "irqbalance" greatly improve stability with 6 cores.

Please note that this change is not required with the previous krn 3.10.0-957 on KVM/centos-7.7 host but is needed with krn 3.10.0-1062

It surprise me that with "irqbalance" disabled the interrupts are nevertheless distributed on the different cores (refering to "cat /proc/interrupts" output). Using "ping -f <host IP>" I can see interrupt on all cores in the VM.
TrevorH

TrevorH

2019-09-21 13:13

manager   ~0035181

CentOS 5 is utterly and completely unsupported.
it72rc

it72rc

2019-09-22 06:39

reporter   ~0035186

I agree, but isn't a good thing that a CentOS 5.11 (with a kernel of 2017) crash while a Win XP VM (dual-core) have no problem on the same host with centos 7.7 ... ;(
Prandal

Prandal

2019-09-22 10:22

reporter   ~0035188

A Reddit thread about this issue can be found here: https://www.reddit.com/r/CentOS/comments/d7iox8/errow_while_copying/
Prandal

Prandal

2019-09-22 10:24

reporter   ~0035189

Oops, note added to wrong ticket

Issue History

Date Modified Username Field Change
2019-09-21 07:00 it72rc New Issue
2019-09-21 07:20 it72rc Note Added: 0035178
2019-09-21 07:49 it72rc Note Added: 0035179
2019-09-21 13:13 TrevorH Note Added: 0035181
2019-09-22 06:39 it72rc Note Added: 0035186
2019-09-22 10:22 Prandal Note Added: 0035188
2019-09-22 10:24 Prandal Note Added: 0035189