Seamless server is FUBAR when attaching from Windows

[totaam]

Issue migrated from trac ticket # 2853

component: server | priority: major | resolution: needinfo

2020-07-24 11:55:32: stdedos created the issue

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All windows are either Transparent, White, have leftover drawing (from themselves or previous windows), or have rendered some random state once and froze with it.

"Xpra-Python3-x86_64_4.1-[r27002](../commit/541311ebdeb9b885dee854ce94f3767340a6bc61)\xpra_cmd" attach ssh://user@ip/2 --ssh="plink -ssh -agent" --modal-windows=no --title="@title@ on @@/@server-display@" --headerbar=off --opengl=no --bandwidth-limit=6Mbps

2020-07-24 13:33:52,951 Xpra GTK3 client version 4.1-[r27002](../commit/541311ebdeb9b885dee854ce94f3767340a6bc61) 64-bit
2020-07-24 13:33:52,952  running on Microsoft Windows 10
2020-07-24 13:33:53,854 GStreamer version 1.16.2 for Python 3.8.4 64-bit
2020-07-24 13:33:54,367 keyboard layout code 0x409
2020-07-24 13:33:54,368 identified as 'United States - English' : us
2020-07-24 13:33:54,555  keyboard settings: layout=us
2020-07-24 13:33:54,559  desktop size is 4160x1440 with 1 screen:
2020-07-24 13:33:54,561   Default (1100x381 mm - DPI: 96x96) workarea: 4160x1400
2020-07-24 13:33:54,561     Generic PnP Monitor 1600x900 at 0x534 (309x174 mm - DPI: 131x131) workarea: 1600x860 at 0x534
2020-07-24 13:33:54,561     C32JG5x 2560x1440 at 1600x0 (697x392 mm - DPI: 93x93) workarea: 2560x1400 at 1600x0
2020-07-24 13:33:58,784 enabled remote logging
2020-07-24 13:33:58,787 Xpra GTK3 X11 server version 3.0.10-26630 64-bit
2020-07-24 13:33:58,788  running on Linux Ubuntu 16.04 xenial
2020-07-24 13:33:58,798 Attached to ip:22
2020-07-24 13:33:58,799  (press Control-C to detach)


(xpra_cmd:1768): Pango-WARNING **: 13:34:00.120: couldn't load font "Bitstream Vera Sans Not-Rotated 14.662109375", falling back to "Sans Not-Rotated 14.662109375", expect ugly output.
2020-07-24 13:34:01,144 UI thread is now blocked
2020-07-24 13:34:01,213 UI thread is running again, resuming
2020-07-24 13:34:01,230 Warning: static gravity is not handled

Re-initting / re-connecting client does not work.

Attaching from inside an xpra session on the same server works (crashed on Windows prolly because OpenGL+Headerbar).

Server reports nothing

u@h [2020-07-24 13:36:04]:/run/user/1000/xpra$ bat display-\:2-\$TIMESTAMP.log
───────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: display-:2-$TIMESTAMP.log
───────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ xpra initialization error:
   2   │  You already have an xpra server running at /run/user/1000/xpra/u-h-2
   3   │   (did you want 'xpra upgrade'?)
───────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────
u@h [2020-07-24 13:36:08]:/run/user/1000/xpra$ bat display-\:2-\$TIMESTAMP.log.old 
───────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: display-:2-$TIMESTAMP.log.old
───────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ xpra initialization error:
   2   │  You already have an xpra server running at /run/user/1000/xpra/u-h-2
   3   │   (did you want 'xpra upgrade'?)
───────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────

xpra info collected, going for xpra upgrade

[totaam]

2020-07-24 12:20:19: stdedos uploaded file redact-xpra-FUBAR-server.log (486.6 KiB)

[totaam]

2020-07-24 12:48:29: stdedos commented

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upgrade does not help. I moved all windows to a new session (and now there is no crash on nested attaching) except the gnome-terminal (no way to automatically open X tabs and type a command in them).

Now, xpra-top shows something interesting:

                                Xpra top 3.0.10-26630
Xpra GTK3 X11 server 64-bit
xpra top - 14:41:37 up 41:06,  1 users, load average: 4.61, 4.15, 3.63
9 threads
cursor at 2111x1437

 ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
 │Python/GTK3 client version 3.0.10-26630                                                        │
 │batch delay: 18 (25)                                                                            │
 │latency: 0 (0)                                                                                  │
 └────────────────────────────────────────────────────────────────────────────────────────────────┘

2 windows
 ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
 │Terminal                                                                                        │
 │166x158 at 1274,1130                                                                            │
 │override-redirect                                                                               │
 │POPUP_MENU                                                                                      │
 └────────────────────────────────────────────────────────────────────────────────────────────────┘
 ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
 │Terminal                                                                                        │
 │2550x1036 at 1601,97 - base-size=(12, 50), minimum-size=(298, 79), gravity=1, increment=(9, 17) │
 │NORMAL                                                                                          │
 └────────────────────────────────────────────────────────────────────────────────────────────────┘

Which matches a white blob of the aforementioned dimensions.

I tried the "Left-Click,Move-NW,Right-Click,Move-NW" * (inf) trick with the mouse, didn't help.
I tried to see other children of the xpra server, but there are no PIDs listed in top, server.pid=19036 is not valid, and it is boring to manually go through 30+ pids from the info file.

[totaam]

2020-07-24 13:37:14: stdedos uploaded file Xpra_cmd_2020-07-24_13-42-11.png (998.5 KiB)

[totaam]

2020-07-24 13:37:27: stdedos uploaded file Xpra_cmd_2020-07-24_13-42-50.png (1714.0 KiB)

[totaam]

2020-07-25 13:50:32: antoine changed owner from antoine to stdedos

[totaam]

2020-07-25 13:50:32: antoine commented

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There are a lot of things I don't really understand in this ticket, so bear with me:

All windows are either Transparent, White, have leftover drawing ..
Even an xterm? gnome-terminal, glxgears?

Attaching from inside an xpra session on the same server works
Nested xpra, cool. So the server is fine?

.. --opengl=no ..
Does opengl make any difference?

--modal-windows=no
FYI: that's been the default since v4 IIRC.

headerbar=off
Also already the default on win32.

Which matches a white blob of the aforementioned dimensions.
Which one? The popup or the normal window?

I tried to see other children of the xpra server
What would those be?

but there are no PIDs listed in top
No, that's a 4.1 feature - which is scheduled to be backported to 3.1 eventually (details in #2553#comment:3)

server.pid=19036 is not valid
That's impossible.
You must be logged into the wrong server.
The pid shown as server.pid is retrieved when requested using os.getpid, so it must be valid.

[totaam]

2020-07-25 15:14:23: stdedos commented

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Replying to [comment:2 Antoine Martin]:

There are a lot of things I don't really understand in this ticket, so bear with me:

No worries. I don't understand how much I suck at reporting sometimes 😅

All windows are either Transparent, White, have leftover drawing ..
Even an xterm? gnome-terminal, glxgears?

I didn't attempt to start new window - I just tried to salvage the server ASAP.

Attaching from inside an xpra session on the same server works
Nested xpra, cool. So the server is fine?

I understand that the ticket title is a bit misleading. As always, feel free renaming.

Given that attaching did not allow to interact at all with the server, ginormous delays (I just looked at a seemingly video for minutes, re-attaching gave me the images above), new session worked fine, nested attachment crashed the Windows client of the new session ...
"I couldn't point that being client's fault".

.. --opengl=no ..
Does opengl make any difference?

--modal-windows=no
FYI: that's been the default since v4 IIRC.

headerbar=off
Also already the default on win32.

Keep in mind that I rather play safe than anything else. Also, to be able to work with xpra.
I think it also helps me making "clearer" bug reports to you (I think).

For the opengl flag: Intel Graphics.

Which matches a white blob of the aforementioned dimensions.
Which one? The popup or the normal window?

The white-blob matches the first window, the un-interactable terminal matches the second window.

I tried to see other children of the xpra server
What would those be?

I don't know - I am trying to inspect to gather more data.
I don't know what the white-blob is, and it didn't make sense belonging to the terminal
(Although, thinking of it makes me think "gnome-terminal right click menu")

but there are no PIDs listed in top
No, that's a 4.1 feature - which is scheduled to be backported to 3.1 eventually (details in #2553#comment:3)

server.pid=19036 is not valid
That's impossible.
You must be logged into the wrong server.
The pid shown as server.pid is retrieved when requested using os.getpid, so it must be valid.

In this ticket, everything is about the physical Ubuntu 16.04.6 server.

ps faux | grep 19036 gave nothing (I could try it again later).
My implementation of descendant_pids definitely did not return anything
(A function that gives: all the parents of PID X (until PID 1), and all of X's kids, until their leaves).

[totaam]

2020-11-16 14:24:03: antoine changed status from new to closed

[totaam]

2020-11-16 14:24:03: antoine set resolution to needinfo