Segfault after Super keypress on client, upon return to server

[Jani Uusitalo]

This is on Unity 2D and Bug #780803 is at least tangentially related. Synergyc is connected to server through an ssh tunnel (which I set up according to http://ur1.ca/7g6o9#), with client positioned left of the server.

Steps to reproduce:
1. Bring mouse cursor from server screen to client screen.
2. Press Super on server keyboard.
3. Bring mouse cursor back to server screen.

What happens:
Synergyc dies with a segfault:
segfault at 8b0a75c8 ip 0062fbf2 sp bff05108 error 4 in libstdc++.so.6.0.16[5d8000+d8000]

(Also, pressing Super at step 2 brings up launcher on server, not on client - that's probably Bug #780803 manifesting on U2D.)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: synergy 1.3.8-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
Uname: Linux 3.2.0-8-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Thu Jan 12 18:39:46 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: synergy
UpgradeStatus: Upgraded to precise on 2011-12-09 (34 days ago)

[Jani Uusitalo (uusijani)]

With both client and the server upgraded to Synergy 1.4.5 Beta from Synergy's download page, the crash no longer occurs.

[Stéphane Graber (stgraber)]

I can either confirm this bug or report a very very similar one since the upgrade in Precise.

Whenever I press shift, synergys will simply die with a segfault. Downgrading back to 1.3.6 fixes it.

[Stéphane Graber (stgraber)]

I meant synergyc, not synergys (both client and server are running 1.3.8)

Bumped priority to High as that essentially makes synergy unusable. Marked as Triaged as it's confirmed to be a synergy bug (downgrading fixes it).

Also subscribed the uploader and the sponsor of the currently broken package.
I'll wait till the Feature Freeze for a fix and if nobody fixed it, will revert to 1.3.6 by uploading it as 1.3.8-1ubuntu1+really-1.3.6-0ubuntu1 (the ugly way of reverting to a working upstream version).

[Dave Gilbert (ubuntu-treblig)]

* St?phane Graber (<email address hidden>) wrote:
> I meant synergyc, not synergys (both client and server are running
> 1.3.8)
>
> Bumped priority to High as that essentially makes synergy unusable.
> Marked as Triaged as it's confirmed to be a synergy bug (downgrading
> fixes it).
>
> Also subscribed the uploader and the sponsor of the currently broken package.
> I'll wait till the Feature Freeze for a fix and if nobody fixed it, will revert to 1.3.6 by uploading it as 1.3.8-1ubuntu1+really-1.3.6-0ubuntu1 (the ugly way of reverting to a working upstream version).

Hi,
  It might be worth checking the upstream 1.3.x synergy tree; the version
I uploaded cherry picked a patch for a copy/paste segfault from the upstream
bug database (and arguably could have picked the version in the upstream tree).

  I very rarely use Super hence hadn't noticed, but I doubt the ubuntu1
fix broke it, but it might be worth checking the 1.3.8-1 without my patch.

  I won't get a chance to look at it until this weekend.

Dave
--
 -----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \
\ gro.gilbert @ treblig.org | | In Hex /
 \ _________________________|_____ http://www.treblig.org |_______/

[Dave Gilbert (ubuntu-treblig)]

Stéphane:
  I can't reproduce the bug here. Can you get a backtrace to see if it matches Jani's ? (Jani's seem a bit touchy; lots of warnings about mismatched crc's in the debug libs).

Dave

[Fran Diéguez (frandieguez)]

Here another one with that error.
If I download the available debs from http://synergy-foss.org/download/ (version 1.4.6) the problem gets solves.

[Stéphane Graber (stgraber)]

I reported bug 937351 so you get a stacktrace.