Bug 83297

Summary:	weston-terminal: exits under intensive terminal output
Product:	Wayland	Reporter:	Remi Denis-Courmont <courmisch>
Component:	weston	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	1.5.0
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Remi Denis-Courmont 2014-08-31 15:21:09 UTC

While the virtual terminal underneath weston-terminal wants to output a lot of data really fast, the terminal process may pseudo-randomly exit abruptly.

When this happens, the Weston error console will show something like:

| Error sending request: Resource temporarily unavailable
| child 7795 exited

On my system, this happens about one in two/tree times running "ls -lR /", but I initially observed the problem with "vlc -vv".

Given the error message, I assume that the Wayland display socket has its kernel-level buffers saturated in the client-to-server direction, and libwayland-client exits instead of gracefully handling the transient error due to non-blocking mode. This is however merely a conjecture.


This bug was originally reported as Debian #760043.

Comment 1 Remi Denis-Courmont 2014-09-02 18:45:00 UTC

Weston server logs are not particularly interesting:

...
[2075835.913] xdg_surface@19.set_transient_for(nil)
[2075835.918] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075835.940] xdg_surface@19.set_transient_for(nil)
[2075835.946] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075835.957] xdg_surface@19.set_transient_for(nil)
[2075835.962] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075835.974] xdg_surface@19.set_transient_for(nil)
[2075835.979] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075835.993] xdg_surface@19.set_transient_for(nil)
[2075835.998] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.010] xdg_surface@19.set_transient_for(nil)
[2075836.015] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.026] xdg_surface@19.set_transient_for(nil)
[2075836.031] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.043] xdg_surface@19.set_transient_for(nil)
[2075836.048] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.060] xdg_surface@19.set_transient_for(nil)
[2075836.065] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.086] xdg_surface@19.set_transient_for(nil)
[2075836.091] xdg_surface@19.set_margin(32, 32, 32, 32)
[2075836.103] xdg_surface@19.set_transient_for(nil)
child 9223 exited


And the client debugs logs are pretty much as boring:

(...)
[2169794,437]  -> xdg_surface@19.set_transient_for(nil)
[2169794,443]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,470]  -> xdg_surface@19.set_transient_for(nil)
[2169794,477]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,504]  -> xdg_surface@19.set_transient_for(nil)
[2169794,510]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,538]  -> xdg_surface@19.set_transient_for(nil)
[2169794,544]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,571]  -> xdg_surface@19.set_transient_for(nil)
[2169794,577]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,605]  -> xdg_surface@19.set_transient_for(nil)
[2169794,611]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,638]  -> xdg_surface@19.set_transient_for(nil)
[2169794,644]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,671]  -> xdg_surface@19.set_transient_for(nil)
[2169794,677]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,705]  -> xdg_surface@19.set_transient_for(nil)
[2169794,711]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
[2169794,738]  -> xdg_surface@19.set_transient_for(nil)
[2169794,744]  -> xdg_surface@19.set_margin(32, 32, 32, 32)
Error sending request: Ressource temporairement non disponible
child 9290 exited

Comment 2 Pekka Paalanen 2014-09-03 06:30:49 UTC

Ok, at least those logs are a good lead. Such a flood should not be sent at all, so we'd better fix the underlying cause rather than paper over it in libwayland-client.

Comment 3 Pekka Paalanen 2014-09-15 08:27:25 UTC

Should be fixed by:

commit b2c18647775732da740946eb199b1f2b46ba950b
Author: Ondřej Majerech <majerech.o@gmail.com>
Date:   Sat Sep 13 16:35:45 2014 +0200

    window: Don't needlessly sync parent and geometry

It's part of Weston master and will be released with 1.6.0.

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