[Pkg-xen-devel] Bug#927071: xen: Odd memory-leak-like behavior for Dom0

[Elliott Mitchell]

Package: src:xen
Version: 4.8.5+shim4.10.2+xsa282-1+deb9u11
Severity: important

I'm observing an odd memory-leak like behavior for Xen's Dom0.

I've been attempting to reduce the memory usage of Dom0 so, I'd been
slowly decreasing the amount allocated to Dom0.  Presently using
"dom0_mem=360M,max:384M".

Two weeks ago I noticed `xl list` was listing less memory for Dom0 than I
thought I'd previously told Xen to allocate.  Worse, `xl mem-set 0 384`
fails to have any effect.  Further observation indicates Dom0 is getting
ballooned down roughly 1-2MB per day, in spite of Xen having plenty of
free memory (more than 1GB is available).

Just tried and `xl mem-set 0` to less than the current limit works, but
`xl mem-set 0 384` merely sets Dom0 back to the previous limit.  Over
time this is forcing restarts of Dom0, which is Bad(tm).

This is a rather serious situation.


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