Hi Rohan,
I checked for the setuid bit and found it is not set:
[maclach@localhost ~]$ ls -l `which vncserver`
-rwxr-xr-x. 1 root root 20378 Oct 30 08:46 /usr/bin/vncserver
I don't know if this matters much but I installed tightvnc from yum (using
CentOS 6.5)
Xvnc TigerVNC 1.1.0 - built Oct 30 2014 12:46:27
Copyright (C) 1999-2011 TigerVNC Team and many others (see README.txt)
See http://www.tigervnc.org for information on TigerVNC.
Underlying X server release 11500000, The X.Org Foundation
I also checked to see if there was some generic block preventing preloading
with vncserver and that doesn't seem to be the case either. I preload a c++
library just to see if I could do it with vncserver and it appears to work:
[maclach@localhost ~]$ export LD_PRELOAD=libstdc++.so.6 ;vncserver :1
New 'localhost.localdomain:1 (maclach)' desktop is localhost.localdomain:1
Starting applications specified in /home/maclach/.vnc/xstartup
Log file is /home/maclach/.vnc/localhost.localdomain:1.log
Can you suggest some other workarounds?
Regards, Glen.
On Mon, Apr 13, 2015 at 6:30 PM, Rohan Garg <rohg...@ccs.neu.edu> wrote:
> Hi Glen,
>
> Could you please check that your vncserver executable doesn't have the
> setuid
> bit set? (Try: ls -l `which vncserver`)
>
> If the vncserver is not a setuid binary, it could be that the vncserver is
> on
> a list of "protected" apps in AppArmor. The kernel doesn't allow
> LD_PRELOAD on
> such applications. We can suggest some workarounds depending on what you
> have.
>
> Thanks,
> Rohan
>
> ----- Original Message -----
> From: "Glen MacLachlan" <macl...@gwu.edu>
> To: "dmtcp-forum" <dmtcp-forum@lists.sourceforge.net>
> Sent: Monday, April 13, 2015 5:25:30 PM
> Subject: [Dmtcp-forum] DMTCP+VNC
>
> Hi,
>
> First, dmtcp is great and I'm very happy with it, generally. I've been
> trying to get the recipe for using dmtcp with vnc (found here:
> http://dmtcp.sourceforge.net/FAQ.html ) working and I've run into some
> unanticipated trouble that I'd like to bounce off somebody more
> knowledgeable than I.
>
> I am using 2.4.0-rc2 and tightvnc for this discussion. Following the
> instructions, in a terminal I do the following:
>
> [maclach@localhost ~]$ dmtcp_launch vncserver :1
> dmtcp_coordinator starting...
> Host: localhost.localdomain (127.0.0.1)
> Port: 7779
> Checkpoint Interval: disabled (checkpoint manually instead)
> Exit on last client: 1
> Backgrounding...
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_alloc.so' from
> LD_PRELOAD cannot be preloaded: ignored.
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_dl.so' from
> LD_PRELOAD cannot be preloaded: ignored.
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_ipc.so' from
> LD_PRELOAD cannot be preloaded: ignored.
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_timer.so' from
> LD_PRELOAD cannot be preloaded: ignored.
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp.so' from
> LD_PRELOAD cannot be preloaded: ignored.
> ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_pid.so' from
> LD_PRELOAD cannot be preloaded: ignored.
>
> The problem preloading only happens when I try to start the vncserver. I
> can use dmtcp just fine with all other applications, including the examples
> provided in the test directory. I've tried preloading the libraries above
> with the --with-plugin option but this does change anything (apart from
> additional messages about not being able to preload).
>
> When I continue on despite the preload issues I try running the vnc client
> which does not work:
> [maclach@localhost ~]$ vncviewer :1
>
> TigerVNC Viewer for X version 1.1.0 - built Oct 30 2014 12:44:50
> Copyright (C) 1999-2011 TigerVNC Team and many others (see README.txt)
> See http://www.tigervnc.org for information on TigerVNC.
>
> Mon Apr 13 17:06:32 2015
> main: unable connect to socket: Connection refused (111)
>
>
> Without dmtcp there is no problem running tightvnc. Any ideas about where
> I'm going wrong or how to work around this problem would be _greatly_
> appreciated.
>
> Thanks, Glen.
>
>
>
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