CentOS - Aug 2012 - tigervnc-server-module crashes after EL 6.3 update

We began experiencing failed vnc connections to the console display on
servers that have been updated to EL 6.3. No such failures have occurred
on similar connections to EL 6.2 servers.

On the client machine a normal vncviewer display appears with the
expected graphical login until the mouse pointer is moved within the
boundaries of the vncviewer window. At this point the window closes and
an error message appears in both a pop-up window and in the terminal
window in which the session was initiated stating "read: Connection
reset by peer (104)".

On the server end, a core dump is generated and a abrt bug report is
created.

/var/log/messages
----------------------------------------------
Aug 14 11:00:30 jato2 abrt[11411]: File '/usr/bin/Xorg' seems to be
deleted
Aug 14 11:00:30 jato2 abrt[11411]: Saved core dump of pid 7892
(/usr/bin/Xorg) to /var/spool/abrt/ccpp-2012-08-14-11:00:30-7892
(42041344 bytes)
Aug 14 11:00:30 jato2 abrtd: Directory 'ccpp-2012-08-14-11:00:30-7892'
creation detected
----------------------------------------------

This bug has been reported in the CentOS bug tracker here:

0005824: tigervnc-server-module keep crashing
http://bugs.centos.org/view.php?id=5824

However, this appears to be a bug upstream. The source RPM provided with
CentOS is identical to that of upstream with no modifications. Also,
there is an upstream bug reported that appears to have the same
symptoms. I have added a comment to the upstream bug report (listed
below) if anyone wishes to see the details.

tigervnc-server-module crashes with dual screen setup
https://bugzilla.redhat.com/show_bug.cgi?id=820443



We have verified that rebuilding the unmodified source RPM for tigervnc
produces a tigervnc-server-module RPM that does not suffer from this
bug.

Removing the original tigervnc-server-module package and replacing it
with the rebuilt one fixes the problem.

I've duplicated the problem on 2 EL 6.3 x86_64 single-head display
machines and have verified the fix.

Tomorrow, I'll duplicate the problem on a dual-head x86_64 machine that
currently still works after updating to EL 6.2 then confirm the the fix.

./Cal

On 08/14/2012 05:23 PM, Cal Webster wrote:
> We began experiencing failed vnc connections to the console display on
> servers that have been updated to EL 6.3. No such failures have occurred
> on similar connections to EL 6.2 servers.
>
> On the client machine a normal vncviewer display appears with the
> expected graphical login until the mouse pointer is moved within the
> boundaries of the vncviewer window. At this point the window closes and
> an error message appears in both a pop-up window and in the terminal
> window in which the session was initiated stating "read: Connection
> reset by peer (104)".
>
> On the server end, a core dump is generated and a abrt bug report is
> created.
>
> /var/log/messages
> ----------------------------------------------
> Aug 14 11:00:30 jato2 abrt[11411]: File '/usr/bin/Xorg' seems to be
> deleted
> Aug 14 11:00:30 jato2 abrt[11411]: Saved core dump of pid 7892
> (/usr/bin/Xorg) to /var/spool/abrt/ccpp-2012-08-14-11:00:30-7892
> (42041344 bytes)
> Aug 14 11:00:30 jato2 abrtd: Directory
'ccpp-2012-08-14-11:00:30-7892'
> creation detected
> ----------------------------------------------
>
> This bug has been reported in the CentOS bug tracker here:
>
> 0005824: tigervnc-server-module keep crashing
> http://bugs.centos.org/view.php?id=5824
>
> However, this appears to be a bug upstream. The source RPM provided with
> CentOS is identical to that of upstream with no modifications. Also,
> there is an upstream bug reported that appears to have the same
> symptoms. I have added a comment to the upstream bug report (listed
> below) if anyone wishes to see the details.
>
> tigervnc-server-module crashes with dual screen setup
> https://bugzilla.redhat.com/show_bug.cgi?id=820443
>
>
>
> We have verified that rebuilding the unmodified source RPM for tigervnc
> produces a tigervnc-server-module RPM that does not suffer from this
> bug.
>
> Removing the original tigervnc-server-module package and replacing it
> with the rebuilt one fixes the problem.
>
> I've duplicated the problem on 2 EL 6.3 x86_64 single-head display
> machines and have verified the fix.
>
> Tomorrow, I'll duplicate the problem on a dual-head x86_64 machine that
> currently still works after updating to EL 6.2 then confirm the the fix.
>
Did you rebuild the SRPM using mock or directly on a physical machine
with rpmbuild?

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On Tue, 2012-08-14 at 20:55 -0500, Johnny Hughes wrote:
> On 08/14/2012 05:23 PM, Cal Webster wrote:
> > We began experiencing failed vnc connections to the console display on
> > servers that have been updated to EL 6.3. No such failures have
occurred
> > on similar connections to EL 6.2 servers.
> >
> > On the client machine a normal vncviewer display appears with the
> > expected graphical login until the mouse pointer is moved within the
> > boundaries of the vncviewer window. At this point the window closes
and
> > an error message appears in both a pop-up window and in the terminal
> > window in which the session was initiated stating "read:
Connection
> > reset by peer (104)".
> >
> > On the server end, a core dump is generated and a abrt bug report is
> > created.
> >
> > /var/log/messages
> > ----------------------------------------------
> > Aug 14 11:00:30 jato2 abrt[11411]: File '/usr/bin/Xorg' seems
to be
> > deleted
> > Aug 14 11:00:30 jato2 abrt[11411]: Saved core dump of pid 7892
> > (/usr/bin/Xorg) to /var/spool/abrt/ccpp-2012-08-14-11:00:30-7892
> > (42041344 bytes)
> > Aug 14 11:00:30 jato2 abrtd: Directory
'ccpp-2012-08-14-11:00:30-7892'
> > creation detected
> > ----------------------------------------------
> >
> > This bug has been reported in the CentOS bug tracker here:
> >
> > 0005824: tigervnc-server-module keep crashing
> > http://bugs.centos.org/view.php?id=5824
> >
> > However, this appears to be a bug upstream. The source RPM provided
with
> > CentOS is identical to that of upstream with no modifications. Also,
> > there is an upstream bug reported that appears to have the same
> > symptoms. I have added a comment to the upstream bug report (listed
> > below) if anyone wishes to see the details.
> >
> > tigervnc-server-module crashes with dual screen setup
> > https://bugzilla.redhat.com/show_bug.cgi?id=820443
> >
> >
> >
> > We have verified that rebuilding the unmodified source RPM for
tigervnc
> > produces a tigervnc-server-module RPM that does not suffer from this
> > bug.
> >
> > Removing the original tigervnc-server-module package and replacing it
> > with the rebuilt one fixes the problem.
> >
> > I've duplicated the problem on 2 EL 6.3 x86_64 single-head display
> > machines and have verified the fix.
> >
> > Tomorrow, I'll duplicate the problem on a dual-head x86_64 machine
that
> > currently still works after updating to EL 6.2 then confirm the the
fix.
> >
> 
> Did you rebuild the SRPM using mock or directly on a physical machine
> with rpmbuild?
No mock, just a simple "rpmbuild -ba SPEC/tigervnc.spec"