Greetings,
I'm having problems with nevada on Xvm. Looking back, I've had the problem all
along. But I didn't really dig into it until now. Specifically, I got very
interested in liveupgrade once the zfs root became available in snv_90.
However, looking back, I believe I've had the problem since the snv_79a/SXDE
01/08 release.
I had hacked together a number of workarounds, thinking I had bitten off a new
Motherboard/CPU combo that wasn't quite stable. But, I've convinced myself
that is not the problem, and the Mobo has been fully patched. I only dug into
things as the problem I'll describe prevents luupgrade from completing.
Problem manifests itself under a variety of circumstances, and at first I
didn't associate it with Xen. The problem is that a system under moderate load
will no longer fork(), and will not send any errors to syslog or stderr.
I've a number of processes that attest to this:
'ntpq -p xenhost' from another system shows reasonable jitter
ssh to the box produces a "password:" prompt (PAM interactive login), but
no shell,
a console login accepts userid, but never prompts for password.
All indicitave of a system that is running but cannot fork().
System in question is an ASUS M3A78-EMH + AMD Phenom 9600 + 8 GBytes RAM.
After flailing about a bit, I backed off, installed snv_91, as there are some
release notes which I thought might apply, and reset the BIOS to factory
defaults, and began the one change per test debug cycle on the snv_91 install.
The test operation was luupgrade (options using a local .iso image, and a zfs
clone BE)
The only common factor associated with the failure was running Solaris as Dom0.
Solaris on bare metal does not exhibit the problem (though I can't say for
certain for snv_79a, snv_86, snv_90, as I wasn't quite so rigorous in testing).
luupgrade completes (as do a number of other large compiles, etc) only when
Solaris runs on the bare metal, regardless of SVM, ECC, ACPI, or other settings.
I can't find a report of the same problem, though this thread may be close:
http://www.opensolaris.org/jive/search.jspa?q=fork%20hangs&objID=f53&dateRange=thisyear&searchID=1108736&forumID=53&rankBy=10001&threadID=58022
I don't grok the xen code at all, so I'm not going to go diving for the fix,
but if this rings a bell, and someone wants me to try something, I'll be happy
to. The system is my test system after all.
Cheers!
-sam
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