Re: [uml-devel] Re: [uml-user] Crash and stability problems with 2.6.15.3-bs2

[Blaisorblade <blaisorblade@yahoo.it>]

On Monday 06 March 2006 20:33, Anthony Brock wrote:
> > On Monday 06 March 2006 9:11, Blaisorblade wrote:
> >
> > On Monday 27 February 2006 17:27, Anthony Brock wrote:
> > > In the mean time, we've experienced a second crash with the
> > > 2.6.15.1-bs1 kernel. It looks to be very similar to the previous crash.
> > > Only, in this case, I issued the command "uml_mconsole www-prod-1 sysrq
> > > s" in preparation for a backup (after issuing a "uml_mconsole $1 stop"
> > > command).
> >
> > It's a particular scenario, and I've been doubtly about it, but
> > indeed it seems that it's safe (at least by design).
>
> I apologize. However, I'm having difficulty understanding your meaning
> here.

I.e. I had doubt about "stop + sysrq s" being safe; today when I looked at the 
code and at what I remembered of my doubt, I concluded I was wrong.

> > > Mem-info:
> > > DMA per-cpu:
> > > cpu 0 hot: low 0, high 18, batch 3 used:2
> > > cpu 0 cold: low 0, high 6, batch 1 used:5
> > > DMA32 per-cpu: empty
> > > Normal per-cpu: empty
> > > HighMem per-cpu: empty
> > > Free pages:         376kB (0kB HighMem)
> > > Active:2985 inactive:8684 dirty:4 writeback:0 unstable:0 free:94
> > > slab:3428 mapped:933 pagetables:48
> > > DMA free:376kB min:1024kB low:1280kB high:1536kB active:11940kB
> > > inactive:34736kB present:65536kB pages_scanned:0 all_unreclaimable?
> > > no
> > > lowmem_reserve[]: 0 0 0 0
> >
> > There are 376kB of free pages, so it's strange that it can't satisfy
> > this request.
>
> I agree. However, this is the only instance where we've been able to
> reproduce a crash with a non-bs2 patched kernel. Other than this, the
> bs1 patches have been very stable.
>
> What can we do to further diagnose this? Alternatively, should we try a
> different guest kernel version or set of patches?
>
> Tony

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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