Re: [uml-devel] UML hanging while deactivating swap

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

On Friday 10 September 2004 05:11, Sven Köhler wrote:
> >>ubd1 of my UML is a swapfs, and when halting or rebooting it, it hangs
> >> while the swap is deactivated (i guess swapoff -a is executed).
> >
> > Can you narrow it down within the shutdown process?  Adding -x to the #!
> > lines of the relevant scripts is a good way to do this.
>
> the relevant lines of the init script are
>
> if [ -n "`swapon -s 2>/dev/null`" ]
> then
>          ebegin "Deactivating swap"
>          swapoff -a &>/dev/null
>          eend $?
> fi
>
> so it _must_ be the "swapoff -a" since i see the "Deactivating swap"
> message, but not the "OK" that eend would generate.

No, the message could be generated but the console not flushed.

However, I think you should manually comment out the "swapoff" line and retry. 
You will maybe discover that is not a fix. Someone else had problems with 
hwclock, instead, so you try this, too.

> > Also, can you get a stack trace from UML?
>
> I don't know how to do that, sorry :-(. I have never worked with gdb and
> suchlike, but i'd really like to help to track the error down somehow.
>
> The UML seems to be still running, since it takes CPU-time on the host,
> but the swapoff seems to never return.
>
> It also hard for me to reproduce this, but i think it only happens when
> swap is used. If i try to reproduce it by running some programs that use
> much memory and therefor things get swapped, the UML halts without
> problems. Other UMLs that ran for months and have about 1MB swap used
> hang while the swap gets deactivated.
Could it be because there is not enough free memory to free the swap?

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729


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