Many segfault across multiple desktops via X2go server on EL9 systems

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Tom Crane

28 Apr 2023 28 Apr '23

7:01 p.m.

I originally submitted a detailed bug report at the Mate Desktop issues Github page here https://github.com/mate-desktop/mate-desktop/issues/553.

I subsequently discovered that other desktops are similarly affected. All of them experienced segfaults or kernel traps in parts of their components, particularly in the Marco window manager that Mate uses.

I have also tried Gnome, Kde, xfce, Cinnamon & Icewm desktops, again on a Centos Stream 9 system. Similar results were found on an Alma 9 system so I do not believe the problem is specific to the 'upstream' / lesser-tested nature of CS9.

Apart from Icewm which remained usable even with the segfaults, the other desktops (particularly Mate which we use a lot for remote working) are rendered unusable by this problem. None of our Centos 7 systems have this problem.

I am running out of ideas to diagnose/fix this problem.

Any thoughts?

Thanks Tom Crane

X2go etc. packages version details (as installed from Epel 9 repository), nxagent-3.5.99.26-6.el9.x86_64 nx-libs-3.5.99.26-6.el9.x86_64 x2goagent-4.1.0.3-17.el9.x86_64 x2goserver-4.1.0.3-17.el9.x86_64 x2goserver-common-4.1.0.3-17.el9.noarch x2goserver-xsession-4.1.0.3-17.el9.noarch

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Ulrich Sibiller

29 Apr 29 Apr

2:17 p.m.

Most probable all those desktops require features that are not offered by NX. We have seen many cases where they do not correctly check what versions of x server extensions are available and assume higher versions. I am not sure but maybe EL9 apps are only tested against Wayland and not longer X11?

Do you have more details when they crash? Will the DEs crash or the x2goagent/nxagent?

Uli

Tom Crane <TPCx2go@mklab.ph.rhul.ac.uk> schrieb am Fr., 28. Apr. 2023, 21:01:

...

I originally submitted a detailed bug report at the Mate Desktop issues Github page here https://github.com/mate-desktop/mate-desktop/issues/553.

I subsequently discovered that other desktops are similarly affected. All of them experienced segfaults or kernel traps in parts of their components, particularly in the Marco window manager that Mate uses.

I have also tried Gnome, Kde, xfce, Cinnamon & Icewm desktops, again on a Centos Stream 9 system. Similar results were found on an Alma 9 system so I do not believe the problem is specific to the 'upstream' / lesser-tested nature of CS9.

Apart from Icewm which remained usable even with the segfaults, the other desktops (particularly Mate which we use a lot for remote working) are rendered unusable by this problem. None of our Centos 7 systems have this problem.

I am running out of ideas to diagnose/fix this problem.

Any thoughts?

Thanks Tom Crane

X2go etc. packages version details (as installed from Epel 9 repository), nxagent-3.5.99.26-6.el9.x86_64 nx-libs-3.5.99.26-6.el9.x86_64 x2goagent-4.1.0.3-17.el9.x86_64 x2goserver-4.1.0.3-17.el9.x86_64 x2goserver-common-4.1.0.3-17.el9.noarch x2goserver-xsession-4.1.0.3-17.el9.noarch

x2go-user mailing list x2go-user@lists.x2go.org https://lists.x2go.org/listinfo/x2go-user

Tom Crane

3:29 p.m.

Thanks for the follow-up.

I am not sure re; EL9 and testing against X11/Wayland.

There are some kernel logs showing where the segfault and kernel traps occur and also some gdb crashdump analyses with stacks shown at the github link below. The crashes I saw were all in the desktop components and not in x2goagent/nxagent.

Tom.

On Sat, 29 Apr 2023, Ulrich Sibiller wrote:

...

Most probable all those desktops require features that are not offered by NX. We have seen many cases where they do not correctly check what versions of x server extensions are available and assume higher versions. I am not sure but maybe EL9 apps are only tested against Wayland and not longer X11? Do you have more details when they crash? Will the DEs crash or the x2goagent/nxagent?

Uli

Tom Crane <TPCx2go@mklab.ph.rhul.ac.uk> schrieb am Fr., 28. Apr. 2023, 21:01: I originally submitted a detailed bug report at the Mate Desktop issues Github page here https://github.com/mate-desktop/mate-desktop/issues/553.
  I subsequently discovered that other desktops are similarly affected. All
  of them experienced segfaults or kernel traps in parts of their
  components, particularly in the Marco window manager that Mate uses.

  I have also tried Gnome, Kde, xfce, Cinnamon & Icewm desktops, again on a
  Centos Stream 9 system.  Similar results were found on an Alma 9 system so
  I do not believe the problem is specific to the 'upstream' / lesser-tested
  nature of CS9.

  Apart from Icewm which remained usable even with the segfaults, the other
  desktops (particularly Mate which we use a lot for remote working) are
  rendered unusable by this problem.  None of our Centos 7 systems have this
  problem.

  I am running out of ideas to diagnose/fix this problem.

  Any thoughts?

  Thanks
  Tom Crane

  X2go etc. packages version details (as installed from Epel 9 repository),
          nxagent-3.5.99.26-6.el9.x86_64
          nx-libs-3.5.99.26-6.el9.x86_64
          x2goagent-4.1.0.3-17.el9.x86_64
          x2goserver-4.1.0.3-17.el9.x86_64
          x2goserver-common-4.1.0.3-17.el9.noarch
          x2goserver-xsession-4.1.0.3-17.el9.noarch
  _______________________________________________
  x2go-user mailing list
  x2go-user@lists.x2go.org
  https://lists.x2go.org/listinfo/x2go-user

Ulrich Sibiller

3:34 p.m.

Forgot the link?

Tom Crane <TPCx2go@mklab.ph.rhul.ac.uk> schrieb am Sa., 29. Apr. 2023, 17:29:

...

Thanks for the follow-up.

I am not sure re; EL9 and testing against X11/Wayland.

There are some kernel logs showing where the segfault and kernel traps occur and also some gdb crashdump analyses with stacks shown at the github link below. The crashes I saw were all in the desktop components and not in x2goagent/nxagent.

Tom.

On Sat, 29 Apr 2023, Ulrich Sibiller wrote:

...
Most probable all those desktops require features that are not offered by NX. We have seen many cases where they do not correctly check what versions of x server extensions are available and assume higher versions. I am not sure but maybe EL9 apps are only tested against Wayland and not longer X11? Do you have more details when they crash? Will the DEs crash or the x2goagent/nxagent?

Uli

Tom Crane <TPCx2go@mklab.ph.rhul.ac.uk> schrieb am Fr., 28. Apr. 2023, 21:01: I originally submitted a detailed bug report at the Mate Desktop issues Github page here https://github.com/mate-desktop/mate-desktop/issues/553.
  I subsequently discovered that other desktops are similarly
affected. All of them experienced segfaults or kernel traps in parts of their components, particularly in the Marco window manager that Mate uses.
  I have also tried Gnome, Kde, xfce, Cinnamon & Icewm desktops,
again on a Centos Stream 9 system. Similar results were found on an Alma 9 system so I do not believe the problem is specific to the 'upstream' / lesser-tested nature of CS9.
  Apart from Icewm which remained usable even with the segfaults,
the other desktops (particularly Mate which we use a lot for remote working) are rendered unusable by this problem. None of our Centos 7 systems have this problem.
  I am running out of ideas to diagnose/fix this problem.

  Any thoughts?

  Thanks
  Tom Crane

  X2go etc. packages version details (as installed from Epel 9
repository), nxagent-3.5.99.26-6.el9.x86_64 nx-libs-3.5.99.26-6.el9.x86_64 x2goagent-4.1.0.3-17.el9.x86_64 x2goserver-4.1.0.3-17.el9.x86_64 x2goserver-common-4.1.0.3-17.el9.noarch x2goserver-xsession-4.1.0.3-17.el9.noarch _______________________________________________ x2go-user mailing list x2go-user@lists.x2go.org https://lists.x2go.org/listinfo/x2go-user

Mike Gabriel

2 May 2 May

5:59 a.m.

Hi Tom, hi Uli,

On Fr 28 Apr 2023 21:01:36 CEST, Tom Crane wrote:

...

I originally submitted a detailed bug report at the Mate Desktop
issues Github page here
https://github.com/mate-desktop/mate-desktop/issues/553.

I subsequently discovered that other desktops are similarly
affected. All of them experienced segfaults or kernel traps in parts
of their components, particularly in the Marco window manager that
Mate uses.

I have also tried Gnome, Kde, xfce, Cinnamon & Icewm desktops, again
on a Centos Stream 9 system. Similar results were found on an Alma
9 system so I do not believe the problem is specific to the
'upstream' / lesser-tested nature of CS9.

Apart from Icewm which remained usable even with the segfaults, the
other desktops (particularly Mate which we use a lot for remote
working) are rendered unusable by this problem. None of our Centos
7 systems have this problem.

I am running out of ideas to diagnose/fix this problem.

Any thoughts?

note that MATE upstream has fixed marco and now checks properly on the
available Xres extension version before using its API (and crashing).

See upstream: [1].

In Debian unstable, I added those patches this recently: [2].

Greets, Mike

[1] https://github.com/mate-desktop/marco/pull/747/commits [2]
https://salsa.debian.org/debian-mate-team/marco/-/tree/master/debian/patches
(patches 0001, 0002 and 0003).

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Mike Gabriel
Tom Crane
Ulrich Sibiller