Fedora33 slow su and ssh due to XAUTHORITY env

[Terry Barnaby]

In the last day or so my system has been showing long delays (> 30 secs) 
when doing a "su -" or "ssh" from an konsole terminal application that

has been opened as a manual session setup at KDE startup.

Investigating the konsole has the environment variable 
"XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole from 
a right hand mouse button click popup on the desktop, that konsole has 
"XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. Opening konsole 
from the main "F" start menu has
"XAUTHORITY=/var/run/sddm/xauth_nsAoIs" 
and so has delays.

Any ideas on what is going on here ? There was an update to sddm 
recently ...

[Ed Greshko]

On 01/02/2021 14:23, Terry Barnaby wrote:
>  In the last day or so my system has been showing long delays (> 30
> secs) when doing a "su -" or "ssh" from an konsole terminal
> application that has been opened as a manual session setup at KDE startup.
>
>  Investigating the konsole has the environment variable
> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole from a right
> hand mouse button click popup on the desktop, that konsole has
> "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. Opening konsole from the
> main "F" start menu has "XAUTHORITY=/var/run/sddm/xauth_nsAoIs"
> and so has delays.
>
>  Any ideas on what is going on here ? There was an update to sddm recently ... 
FWIW, I see the same observation with the XAUTHORITY variable.  However, I'm seeing no
delays when
doing "su -" or doing an ssh to a remote system.

[egreshko@meimei ~]$ rpm -q sddm
sddm-0.19.0-5.fc33.x86_64

-- 
The key to getting good answers is to ask good questions.

[Terry Barnaby]

On 01/02/2021 06:23, Terry Barnaby wrote:
>  In the last day or so my system has been showing long delays (> 30
>
>  secs) when doing a "su -" or "ssh" from an konsole terminal 
>  application that has been opened as a manual session setup at KDE 
>  startup.
>
>  Investigating the konsole has the environment variable 
>  "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole 
>  from a right hand mouse button click popup on the desktop, that 
>  konsole has "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. 
>  Opening konsole from the main "F" start menu has 
>  "XAUTHORITY=/var/run/sddm/xauth_nsAoIs" and so has delays.
>
>  Any ideas on what is going on here ? There was an update to sddm 
>  recently ...
>  
Further point, downgrading sddm to 0.18.1-8.fc33 fixes the issue, so 
definitely something todo with changes in sddm. But is sddm now correct 
and some of my older config wrong ?

[Ed Greshko]

On 01/02/2021 14:31, Terry Barnaby wrote:
>  On 01/02/2021 06:23, Terry Barnaby wrote:
> > In the last day or so my system has been showing long delays (> 30 secs) when
> doing a "su -" or "ssh" from an konsole terminal application that has
> been opened as a manual session setup at KDE startup.
> >
> > Investigating the konsole has the environment variable
> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole from a right
> hand mouse button click popup on the desktop, that konsole has
> "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. Opening konsole from the
> main "F" start menu has "XAUTHORITY=/var/run/sddm/xauth_nsAoIs" and so
> has delays.
> >
> > Any ideas on what is going on here ? There was an update to sddm recently ...
> >
>  Further point, downgrading sddm to 0.18.1-8.fc33 fixes the issue, so definitely something
> todo with changes in sddm. But is sddm now correct and some of my older config wrong ?
Also, FWIW, on an F32 system....

R-click start XAUTHORITY=/home/egreshko/.Xauthority
Menu start XAUTHORITY=/tmp/xauth-1026-_0

[egreshko@f32k ~]$ cmp -b /home/egreshko/.Xauthority /tmp/xauth-1026-_0
[egreshko@f32k ~]$

[egreshko@f32k ~]$ rpm -q sddm
sddm-0.18.1-4.fc32.x86_64

And on the F33 system...

[egreshko@meimei ~]$ cmp -b /tmp/xauth-1026-_0 /var/run/sddm/xauth_umbOSp
[egreshko@meimei ~]$


-- 
The key to getting good answers is to ask good questions.

[Terry Barnaby]

On 01/02/2021 06:45, Ed Greshko wrote:
>  On 01/02/2021 14:31, Terry Barnaby wrote:
> > On 01/02/2021 06:23, Terry Barnaby wrote:
> >> In the last day or so my system has been showing long delays (> 30 
> >> secs) when doing a "su -" or "ssh" from an konsole terminal 
> >> application that has been opened as a manual session setup at KDE 
> >> startup.
> >>
> >> Investigating the konsole has the environment variable 
> >> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole 
> >> from a right hand mouse button click popup on the desktop, that 
> >> konsole has "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. 
> >> Opening konsole from the main "F" start menu has 
> >> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs" and so has delays.
> >>
> >> Any ideas on what is going on here ? There was an update to sddm 
> >> recently ...
> >>
> > Further point, downgrading sddm to 0.18.1-8.fc33 fixes the issue, so 
> > definitely something todo with changes in sddm. But is sddm now 
> > correct and some of my older config wrong ?
>
>  Also, FWIW, on an F32 system....
>
>  R-click start XAUTHORITY=/home/egreshko/.Xauthority
>  Menu start XAUTHORITY=/tmp/xauth-1026-_0
>
>  [egreshko@f32k ~]$ cmp -b /home/egreshko/.Xauthority /tmp/xauth-1026-_0
>  [egreshko@f32k ~]$
>
>  [egreshko@f32k ~]$ rpm -q sddm
>  sddm-0.18.1-4.fc32.x86_64
>
>  And on the F33 system...
>
>  [egreshko@meimei ~]$ cmp -b /tmp/xauth-1026-_0 /var/run/sddm/xauth_umbOSp
>  [egreshko@meimei ~]$
>
>  
In my case the /tmp/xauth-1002-_0 and /var/run/sddm/xauth_xpDgqp files 
also have the same content. The ~/.Xauthority is different however. 
Removing ~/.Xauthority does not appear to have any effect.

In my case I also have "ForwardX11 yes" in .ssh/config as I use X11 apps 
over ssh quite frequently. Removing that allows ssh to be quick (as 
expected) although "su -" is still slow.

Note I am using X11 rather than Wayland.

[Terry Barnaby]

In my case the /tmp/xauth-1002-_0 and /var/run/sddm/xauth_xpDgqp files 
also have the same content. The ~/.Xauthority is different however. 
Removing ~/.Xauthority does not appear to have any effect.
>  In my case I also have "ForwardX11 yes" in .ssh/config as I use X11 
>  apps over ssh quite frequently. Removing that allows ssh to be quick 
>  (as expected) although "su -" is still slow.
>
>  Note I am using X11 rather than Wayland.  

When I downgrade to sddm-0.18.1-8.fc33 the "on-login" konsoles have 
"XAUTHORITY=/home/terry/.Xauthority" and the R-click konsoles have 
"XAUTHORITY=/tmp/xauth-1002-_0" and these two files are the same.

[Rex Dieter]

Terry Barnaby wrote:

>  In the last day or so my system has been showing long delays (> 30
> secs)
>  when doing a "su -" or "ssh" from an konsole terminal application
> that
>  has been opened as a manual session setup at KDE startup.
>  
>  Investigating the konsole has the environment variable
>  "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole from
>  a right hand mouse button click popup on the desktop, that konsole has
>  "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. Opening konsole
>  from the main "F" start menu has
> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs"
>  and so has delays.
>  
>  Any ideas on what is going on here ? There was an update to sddm
>  recently ... 
Yes, due to recent f33 sddm update (most likely), being tracked here:
https://bugzilla.redhat.com/show_bug.cgi?id=1922772

(I didn't see that mentioned yet in the thread)

I'll probably look into reverting to an older iteration of our xauth patch 
that didn't suffer from this problem.  stay tuned...

-- Rex

[Terry Barnaby]

On 01/02/2021 13:38, Rex Dieter wrote:
>  Terry Barnaby wrote:
>
> > In the last day or so my system has been showing long delays (> 30 secs)
> > when doing a "su -" or "ssh" from an konsole terminal application
> that
> > has been opened as a manual session setup at KDE startup.
> >
> > Investigating the konsole has the environment variable
> > "XAUTHORITY=/var/run/sddm/xauth_nsAoIs". Now if you open a konsole from
> > a right hand mouse button click popup on the desktop, that konsole has
> > "XAUTHORITY=/tmp/xauth-1002-_0" and suffers no delays. Opening konsole
> > from the main "F" start menu has
> "XAUTHORITY=/var/run/sddm/xauth_nsAoIs"
> > and so has delays.
> >
> > Any ideas on what is going on here ? There was an update to sddm
> > recently ...
>  Yes, due to recent f33 sddm update (most likely), being tracked here:
>  https://bugzilla.redhat.com/show_bug.cgi?id=1922772
>
>  (I didn't see that mentioned yet in the thread)
>
>  I'll probably look into reverting to an older iteration of our xauth patch
>  that didn't suffer from this problem.  stay tuned...
>
>  -- Rex
>
>  _______________________________________________ 
Looks like the latest sddm-0.19.0-6.fc33.x86_64 fixes the issue.

Many thanks!

Terry