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Re: [Xen-devel] xen-2.0 20040923 and previous: rpm crash in xenU

To: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] xen-2.0 20040923 and previous: rpm crash in xenU
From: Peri Hankey <mpah@xxxxxxxxxxxxxx>
Date: Tue, 28 Sep 2004 14:57:59 +0100
Cc: Flavio Leitner <fbl@xxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxxx
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Here's a summary of results so far. I wasn't able to try your test on the fedora xenU system as it was a minimal install - I was planning to install extras as needed using poldek (like yum or urpmi, from PLD, minimal external dependencies, very handy - but it relies on rpm to do the actual installs).

using xen-20040927 (changelog in today's unstable doesn't suggest there would be much difference):

xen0 (mandrake 10.0 - 2.6.8.1-xen0)    time-test OK      rpm: OK             
/lib/libc.so.6 -> libc-2.3.3.so

xenU (mandrake 10.0 - 2.6.8.1-xenU)    time-test FAIL    rpm: CRASH          
/lib/libc.so.6 -> libc-2.3.3.so
xenU (fedora-2 - 2.6.8.1-xenU) time-test ???? rpm: CRASH /lib/libc.so.6 -> libc-2.3.3.so xenU (PLD Linux - 2.6.8.1-xenU) time-test OK rpm: OK /lib/libc.so.6 -> libc-2.3.3.so xenU (Debian Sarge - 2.6.8.1-xenU) time-test OK rpm: NOT AVAILABLE /lib/libc.so.6 -> libc-2.3.2.so No very clear pattern - on the face of it it looks as if the same library version produces different results. I suppose that could be a result of different compiler flags and optimisation levels.

I don't know if that helps much.

-- Peri

Ian Pratt wrote:

Is there any kind of workaround for this nanosleep problem?

It's a bug, and one that's probably trivial to fix if we can pin
down the combination of CPU and libraries etc that provoke it.

Are you using the latest unstable tree? Does my test program
still indicate a problem for you? If so, please post the output
of /proc/cpuinfo, and information about your distribution and
libraries.

Like the only other pending bug (the network panic bug) it seems
only to effect a minority of users, and we can't seem to
reproduce it locally. Until we get more information I'm afraid
there's not a lot we can do beyond simply reviewing the code.

Thanks,
Ian


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