You can try to run x2goclient --debug. And you can try to disable all sorts of additional services as printing, sound and file sharing.

Uli

On Fri, Jul 29, 2022 at 8:05 AM Peter Bieringer <pb@bieringer.de> wrote:

Hi,

installed 2x VMs

• AlmaLinux 8.6 (latest) + all updates

yum groupinstall XFCE

# yum install x2goclient x2goserver

Connect via x2goclient from Fedora 36 to AlmaLinux#1 Try to connect from AlmaLinux#1 to AlmaLinux#2

-> X2go session is created, but not really started

Checked required Qt5 libraries

# ldd /usr/bin/x2goclient | grep Qt5 | awk '{ print $3 }' | while read lib; do rpm -qf $lib; done | sort -u qt5-qtbase-5.15.2-4.el8.x86_64 qt5-qtbase-gui-5.15.2-4.el8.x86_64 qt5-qtsvg-5.15.2-4.el8.x86_64 qt5-qtx11extras-5.15.2-2.el8.x86_64

downgraded on AlmaLinux#1 to Qt5 of AlmaLinux 8.4 (http://repo.almalinux.org/vault/8.4/AppStream/x86_64/os/Packages/)

# rpm -Uhv --force qt5-qtbase-5.12.5-8.el8.x86_64.rpm qt5-qtbase-gui-5.12.5-8.el8.x86_64.rpm qt5-qtsvg-5.12.5-1.el8.x86_64.rpm qt5-qtx11extras-5.12.5-1.el8.x86_64.rpm qt5-qtbase-common-5.12.5-8.el8.noarch.rpm

Connect from AlmaLinux#1 to AlmaLinux#2 is successful

Please advice how to support debugging.

BTW: filed also ticket on Red Hat's Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2109841

Regards, Peter

---

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

Hi,

Am 29.07.22 um 19:41 schrieb Randy Goldenberg:

I'm not sure what you mean by "X2go session is created, but not really started".

On server side, a session is created, detectable with "x2golistsession" and in case the client is terminated on reconnect it claims about an existing session.

X2goclient still shows "connecting", but has already connected somehow.

Also I cannot enable "Show details" in the GUI during client hangs.

Downgraded Qt5, here I'm able now to activate "Show details", which is remembered also after upgrading Qt5 again.

Looks like compared to Qt5.12 it hangs before showing:

Loop: WARNING! Disabling NX delta compression. Loop: WARNING! Disabling use of NX persistent cache. Info: Connection with remote proxy completed.

(on 1 of x starts with Qt5.15 the "Show details" content was update at all before hanging)

x2goclient --debug is also showing nothing on console

"ltrace --f x2goclient --debug" shows tons of following loop:

[pid 2703] _ZN6QMutex4lockEv(0x5597e7091690, 0x7f833c5561e0, 0x5597e7091ce0, 0) = 0 [pid 2703] _ZN6QMutex6unlockEv(0x5597e7091690, 0x7f833c5561e0, 0x7f833a7fdaf0, 0) = 1 [pid 2703] _ZN6QMutex4lockEv(0x5597e7091688, 0x7f833c5561e0, 1, 1) = 0 [pid 2703] _ZN6QMutex6unlockEv(0x5597e7091688, 0x7f833c5561e0, 0x5597e70917b0, 1) = 1 [pid 2703] _ZN7QThread6usleepEm(500, 0x7f833c5561e0, 1, 1) = 0 [pid 2703] _ZN6QMutex4lockEv(0x5597e7091698, 0x7f8321202740, 0, 0x7f8339feb170) = 0 [pid 2703] _ZN6QMutex6unlockEv(0x5597e7091698, 0x7f8321202740, 0, 0x7f8339feb170) = 1 [pid 2703] _ZN6QMutex4lockEv(0x5597e70916a8, 0x7f8321202740, 1, 1) = 0 [pid 2703] _ZN6QMutex6unlockEv(0x5597e70916a8, 0x7f8321202740, 0, 1) = 1 [pid 2703] ssh_channel_accept_forward(0x7f8310004e40, 0, 0x7f8321202660,

1. = 0

"strace --f x2goclient --debug" shows tons of following loop:

2774 nanosleep({tv_sec=0, tv_nsec=500000}, 0x7fb8cd94f740) = 0 2774 poll([{fd=12, events=POLLIN}], 1, 0) = 0 (Timeout)

Might this be the known issue with XFCE compositing? I encountered it for the first time when connecting from an AlmaLinux 8 client.

https://wiki.x2go.org/doku.php/doc:de-compat

This is already known since some time and disabled in advance.

Regards, Peter

Hi Peter,

On Fr 29 Jul 2022 21:42:20 CEST, Peter Bieringer wrote:

Sorry, have now read how --debug works...

Now started with: x2goclient --debug --libssh-debug 2>&1 | tee
/tmp/x2goclient-<QTversion>.log

with Qt5.15:

[2022/07/29 19:34:20.759320, 2] channel_open: Creating a channel 46
with 64000 window and 32768 max packet [2022/07/29 19:34:20.760544, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 46:0 [2022/07/29 19:34:20.760601, 2] ssh_packet_channel_open_conf:
Remote window : 0, maxpacket : 32768 [2022/07/29 19:34:20.764500, 2] channel_rcv_change_window: Adding
2097152 bytes to channel (46:0) (from 0 bytes) [2022/07/29 19:34:20.764587, 2] channel_request: Channel request
exec success [2022/07/29 19:34:21.075221, 2] grow_window: growing window
(channel 46:0) to 1280000 bytes

then it loops here forever:

[2022/07/29 19:29:54.114274, 1] ssh_channel_accept: No channel
request of this type from server

Stopping after 4x CHANNEL_OPEN_CONFIRMATION (43...46)

# grep CHANNEL_OPEN_CONFIRMATION /tmp/x2goclient-5.15.log [2022/07/29 19:34:12.681745, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 43:0 [2022/07/29 19:34:12.897503, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 44:0 [2022/07/29 19:34:17.564870, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 45:0 [2022/07/29 19:34:20.760544, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 46:0

with Qt5.12: results in 8x CHANNEL_OPEN_CONFIRMATION (43...50)

# grep CHANNEL_OPEN_CONFIRMATION /tmp/x2goclient-5.12.log [2022/07/29 19:35:27.930657, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 43:0 [2022/07/29 19:35:28.147269, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 44:0 [2022/07/29 19:35:37.330360, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 45:0 [2022/07/29 19:35:41.191864, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 46:0 [2022/07/29 19:35:47.790986, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 47:0 [2022/07/29 19:35:47.968874, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 48:1 [2022/07/29 19:35:48.649804, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 49:1 [2022/07/29 19:36:06.888934, 2] ssh_packet_channel_open_conf:
Received a CHANNEL_OPEN_CONFIRMATION for channel 50:0

Have you rebuilt x2goclient against Qt5.15? Or simply replaced the Qt5 libs?

You have to rebuild x2goclient.

Does that help? (In case you haven't rebuilt x2goclient, so far)?

Mike

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