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[Xen-bugs] [Bug 145] New: Balloon or set-mem too low causes hang

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Subject: [Xen-bugs] [Bug 145] New: Balloon or set-mem too low causes hang
From: pl@xxxxxxxxxx
Date: Fri, 05 Aug 2005 15:58:04 +0000
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           Summary: Balloon or set-mem too low causes hang
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: pl@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx

This is a well known problem, but it should really be documented as a bug. 
Using either the /proc/xen/balloon interface, or xm set-mem (previously xm
balloon) to set the memory reservation for a domain to a value far too low,
causes the domain to hang.  This applies to both dom0 and domU, but of course
the results are a bit more severe in dom0.

Example for reproducing this:
# xm set-mem some-domain 1
echo 100 > /proc/xen/balloon

The current version I'm testing with is xen-unstable:
changeset:   6026:b63577ff53a3161ac73b55e0aa87803e76c8bde5
tag:         tip
user:        kaf24@xxxxxxxxxxxxxxxxxxxx
date:        Fri Aug  5 09:57:43 2005
summary:     Fix xtime_lock handling to avoid deadlock in sched_clock().

It's really far to easy to shoot yourself in the foot here, and I believe this
needs to be more than simply documented.

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