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Red Hat Bugzilla – Attachment 604741 Details for
Bug 770000
KVM kdump out of puff!
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[patch]
exclude virtio_balloon
2 (text/plain), 1.26 KB, created by
Dave Young
on 2012-08-16 01:53:55 UTC
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Description:
exclude virtio_balloon
Filename:
MIME Type:
Creator:
Dave Young
Created:
2012-08-16 01:53:55 UTC
Size:
1.26 KB
patch
obsolete
>exclude virtio_balloon kernel module > >Resolves: bz770000 > >kvm guest with balloon driver used will possibly oom and fail to capture vmcore. > >Copy comment from Rafael Aquini about the reason: >--- >When memory ballooning is enabled for the guest, and the virtio_balloon driver is getting loaded into kdump's relocated kernel, the configured balloon target size will be "inherited" and the hypervisor will command the balloon driver to inflate a memory balloon up to its target. As the kdump relocated kernel boots within a memory constrained environment, the balloon memory inflation leads to the OOM-killer storm scenario that prevents kdump on proceeding with its task. >--- > >Inflate balloon in kdump kernel does not make sense, so here exclude the >virtio_balloon module in dumprd. > >Testing: >Tested by Rafael Aquini <aquini@redhat.com> > >Signed-off-by: Dave Young <dyoung@redhat.com> >--- > mkdumprd | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > >--- kexec-tools.orig/mkdumprd >+++ kexec-tools/mkdumprd >@@ -2597,7 +2597,7 @@ cat >> $MNTIMAGE/etc/passwd << EOF > root:x:0:0:root:/root:/bin/bash > EOF > >-default_exclude_modules="snd soundcore cfg80211 mac80211 iwl" >+default_exclude_modules="snd soundcore cfg80211 mac80211 iwl virtio_balloon" > > # $1: module basename > exclude_module() {
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bug 770000
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604740
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