[arch-general] Upgrading while using a package (WAS: Re: pacman -Syu -- then tons of kio and kbuildsycoca warnings. Bug or coincidence?)

diederick diederick at diederickdevries.net
Thu Oct 14 05:37:43 EDT 2010

On Thu, 14 Oct 2010 09:09:27 +0200, Stefan Husmann
<stefan-husmann at t-online.de> wrote:
> Am 14.10.2010 08:40, schrieb diederick:
>> On 10/13/2010 11:03 PM, David Rosenstrauch wrote:
>>> On 10/09/2010 12:57 AM, David C. Rankin wrote:
>>>> Guys, just updated and got a slew of warning dumped back to konsole:
>>> Nothing strange to me at all:  you're upgrading qt while you're in KDE
>>> (which uses qt).  It's never a good idea to upgrade a package while it's
>>> being used.  If you're upgrading a daemon, shut down the daemon first;
>>> if you're upgrading qt, exit KDE first; if you're upgrading the kernel,
>>> udev, etc., drop to single user mode first.
>> I didn't know that, nor did I read that somewhere on the wiki. Why is
>> this? Aren't programs copied to memory (i.e. loaded) before being used?
>> In that case, isn't the upgraded version left alone until it is loaded
>> the next time the program is started? Where can I find more on this?
>> Thanks,
>> Diederick
>> --
>> http://www.diederickdevries.net/
> Hello,
> in general you are right, but you never know. Programs are doing something. 
> Some may reload data files even or program code at runtime. 

Right. In your earlier post, you specifically mention the kernel. Would
you say that it is safe to install a new kernel in multi user mode if I
reboot right after installation, while not using modprobe et al. between
the installation and the reboot? And if not, why is single user mode

Thanks for your quick response,


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