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Posted to user@guacamole.apache.org by Nicolas Lécureuil <ni...@siveo.net> on 2018/06/27 14:01:05 UTC
Segfault with guacamole 0.9.14
Hi,
i rebuilded guacd 0.9.14 ( using my own build debs )
# dpkg -l | grep guac
ii guacamole 0.9.14-4 all HTML5 web application for accessing remote desktops
ii guacamole-auth-mysql 0.9.14-1 all Guacamole Mysql Identification
ii guacd 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (proxy daemon)
ii guacd-dbgsym 0.9.14-1 amd64 Debug symbols for guacd
ii libguac-client-rdp0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (RDP support)
ii libguac-client-rdp0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-rdp0
ii libguac-client-ssh0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (SSH support)
ii libguac-client-ssh0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-ssh0
ii libguac-client-vnc0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (VNC support)
ii libguac-client-vnc0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-vnc0
ii libguac-dev:amd64 0.9.14-1 amd64 Guacamole proxy daemon (core library headers)
ii libguac11:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (library)
ii libguac11-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac11
Each time i use the vnc plugin i can see a segfault in the logs.
Jun 27 14:48:28 pulsemaster kernel: [712278.556955] guacd[25572]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:49:35 pulsemaster kernel: [712345.817333] guacd[25612]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:50:41 pulsemaster kernel: [712412.051393] guacd[25655]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:51:47 pulsemaster kernel: [712477.883688] guacd[25700]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:52:54 pulsemaster kernel: [712544.755122] guacd[25746]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:54:03 pulsemaster kernel: [712613.432083] guacd[25794]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:55:08 pulsemaster kernel: [712678.871467] guacd[25836]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:55:29 pulsemaster kernel: [712699.432836] guacd[25883]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:57:39 pulsemaster kernel: [712829.633618] guacd[26029]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:58:35 pulsemaster kernel: [712885.994620] guacd[26072]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
Jun 27 14:59:20 pulsemaster kernel: [712931.152907] guacd[26119]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
I use a debian stretch.
The vnc server is installed on a windows 10 ( TightVNC )
i am sure i use the new guacd and plugins ( as shown in the dpkg command ).
Btw the rdp plugin works 100% of the time
What can i do to help debugging ?
Regards,
Nicolas Lécureuil.
Re: Segfault with guacamole 0.9.14
Posted by Nick Couchman <vn...@apache.org>.
>
> What version of the libvncserver/libvncclient are you building against?
>
> # dpkg -l | grep vncclient
> ii libvncclient1:amd64 0.9.11+dfsg-1+deb9u1 amd64 API to write one's own
> VNC server - client library
>
Hmmm....I can't remember if there are any version-specific issues with that
version of libvncclient, but I'd expect the segfault message to happen in
libvncclient not the Guacamole library, if that were the case.
> Any special configuration for VNC?
>
> for the client, this is nothing special
>
> Are you trying to use encryption?
>
> No encryption
>
> no password, trought reverse ssh with ssh-key without passphrase
>
> Jun 27 16:10:34 pulsemaster kernel: [717204.421339] guacd[28944]: segfault
> at 10 ip 00007f9ead26c692 sp 00007f9eaec7ad10 error 4 in
> libguac-client-vnc.so.0.0.0[7f9ead264000+13000]
>
At this point I'd probably need a core dump or gdb stack trace to track
down the issue.
You can see if any of the following issues match the scenario you're
running into:
https://issues.apache.org/jira/browse/GUACAMOLE-424
https://issues.apache.org/jira/browse/GUACAMOLE-428
Those issues are related - one deals with VNC password issues, but it looks
like the fix takes care of at least a couple of scenarios. It looks like
that's not fixed in the 0.9.14 code but will be in the 1.0.0 code, so you
could try building guacd from the git repo, either the master branch or the
staging/1.0.0 branch.
-Nick
Re: Segfault with guacamole 0.9.14
Posted by Mike Jumper <mi...@glyptodon.org>.
On Wed, Jun 27, 2018 at 12:47 PM, Mike Jumper <mi...@glyptodon.org> wrote:
> On Wed, Jun 27, 2018 at 7:20 AM, Nicolas Lécureuil
> <ni...@siveo.net> wrote:
>>
>> ...
>> Jun 27 16:10:34 pulsemaster guacd[28941]: User is not responding.
>> Jun 27 16:10:34 pulsemaster guacd[24552]: Connection "$12c5328c-c127-453d-bc9c-f631bf8e90f8" removed.
>> Jun 27 16:10:34 pulsemaster kernel: [717204.421339] guacd[28944]: segfault at 10 ip 00007f9ead26c692 sp 00007f9eaec7ad10 error 4 in libguac-client-vnc.so.0.0.0[7f9ead264000+13000]
>> ...
>>
>
> This segfault is occurring after the connection has already ended,
> while the resources consumed by that connection are being freed (the
> "User is not responding" message indicates that the connection has
> been closed due to a network timeout). I believe this was recently
> fixed:
>
> https://issues.apache.org/jira/browse/GUACAMOLE-424
>
> The segfault in the case of the above issue was due to an erroneous
> attempt to free SFTP-related resources when SFTP was not actually
> being used for the connection. If you're seeing unexpected
> disconnections, the issue causing those disconnections is likely
> elsewhere, as this particular bug did not affect connection stability.
>
Unless I'm thinking of a different issue, and the above was related to
freeing display resources that were not actually yet allocated.
Either way ... if you're seeing unexpected disconnects, this segfault
is due to something going wrong while handling the disconnect that has
already occurred; it isn't the cause of the disconnect.
- Mike
Re: Segfault with guacamole 0.9.14
Posted by Mike Jumper <mi...@glyptodon.org>.
On Wed, Jun 27, 2018 at 7:20 AM, Nicolas Lécureuil
<ni...@siveo.net> wrote:
>
> ...
> Jun 27 16:10:34 pulsemaster guacd[28941]: User is not responding.
> Jun 27 16:10:34 pulsemaster guacd[24552]: Connection "$12c5328c-c127-453d-bc9c-f631bf8e90f8" removed.
> Jun 27 16:10:34 pulsemaster kernel: [717204.421339] guacd[28944]: segfault at 10 ip 00007f9ead26c692 sp 00007f9eaec7ad10 error 4 in libguac-client-vnc.so.0.0.0[7f9ead264000+13000]
> ...
>
This segfault is occurring after the connection has already ended,
while the resources consumed by that connection are being freed (the
"User is not responding" message indicates that the connection has
been closed due to a network timeout). I believe this was recently
fixed:
https://issues.apache.org/jira/browse/GUACAMOLE-424
The segfault in the case of the above issue was due to an erroneous
attempt to free SFTP-related resources when SFTP was not actually
being used for the connection. If you're seeing unexpected
disconnections, the issue causing those disconnections is likely
elsewhere, as this particular bug did not affect connection stability.
- Mike
Re: Segfault with guacamole 0.9.14
Posted by Nicolas Lécureuil <ni...@siveo.net>.
> Le 27 juin 2018 à 16:11, Nick Couchman <vn...@apache.org> a écrit :
>
>
>
> On Wed, Jun 27, 2018 at 10:01 AM Nicolas Lécureuil <nicolas.lecureuil@siveo.net mailto:nicolas.lecureuil@siveo.net > wrote:
>
> > >
> > Hi,
> >
> > i rebuilded guacd 0.9.14 ( using my own build debs )
> >
> > # dpkg -l | grep guac
> > ii guacamole 0.9.14-4 all HTML5 web application for accessing remote desktops
> > ii guacamole-auth-mysql 0.9.14-1 all Guacamole Mysql Identification
> > ii guacd 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (proxy daemon)
> > ii guacd-dbgsym 0.9.14-1 amd64 Debug symbols for guacd
> > ii libguac-client-rdp0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (RDP support)
> > ii libguac-client-rdp0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-rdp0
> > ii libguac-client-ssh0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (SSH support)
> > ii libguac-client-ssh0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-ssh0
> > ii libguac-client-vnc0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (VNC support)
> > ii libguac-client-vnc0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-vnc0
> > ii libguac-dev:amd64 0.9.14-1 amd64 Guacamole proxy daemon (core library headers)
> > ii libguac11:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (library)
> > ii libguac11-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac11
> >
> > >
> What version of the libvncserver/libvncclient are you building against?
>
> > >
> >
> >
> > Each time i use the vnc plugin i can see a segfault in the logs.
> >
> > Jun 27 14:48:28 pulsemaster kernel: [712278.556955] guacd[25572]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:49:35 pulsemaster kernel: [712345.817333] guacd[25612]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:50:41 pulsemaster kernel: [712412.051393] guacd[25655]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:51:47 pulsemaster kernel: [712477.883688] guacd[25700]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:52:54 pulsemaster kernel: [712544.755122] guacd[25746]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:54:03 pulsemaster kernel: [712613.432083] guacd[25794]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:55:08 pulsemaster kernel: [712678.871467] guacd[25836]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:55:29 pulsemaster kernel: [712699.432836] guacd[25883]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:57:39 pulsemaster kernel: [712829.633618] guacd[26029]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:58:35 pulsemaster kernel: [712885.994620] guacd[26072]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> > Jun 27 14:59:20 pulsemaster kernel: [712931.152907] guacd[26119]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> >
> > I use a debian stretch.
> > The vnc server is installed on a windows 10 ( TightVNC )
> >
> > > Any special configuration for VNC? Are you trying to use encryption? Anything else different about your VNC server configuration? Have you tried against other VNC servers on other target?
>
> -Nick
>
>
>
> What version of the libvncserver/libvncclient are you building against?
>
# dpkg -l | grep vncclient
ii libvncclient1:amd64 0.9.11+dfsg-1+deb9u1 amd64 API to write one's own VNC server - client library
>
> Any special configuration for VNC?
>
for the client, this is nothing special
>
> Are you trying to use encryption?
>
No encryption
>
> Anything else different about your VNC server configuration?
>
no password, trought reverse ssh with ssh-key without passphrase
>
> Have you tried against other VNC servers on other target?
>
No, only tightvnc as this is the plugin we use on our software
in the logs i can see:
Jun 27 16:10:31 pulsemaster guacd[24552]: Creating new client for protocol "vnc"
Jun 27 16:10:31 pulsemaster guacd[24552]: Connection ID is "$2b73afc9-4268-4f26-8942-5ddf0024536c"
Jun 27 16:10:31 pulsemaster guacd[29002]: Cursor rendering: local
Jun 27 16:10:31 pulsemaster guacd[29002]: User "@ae1d47fe-24e6-4557-ad07-2178e528524f" joined connection "$2b73afc9-4268-4f26-8942-5ddf0024536c" (1 users now present)
Jun 27 16:10:31 pulsemaster guacd[29002]: Listening for connections on port 65408
Jun 27 16:10:31 pulsemaster guacd[29002]: -listennofork: Listening on port 65408
Jun 27 16:10:31 pulsemaster guacd[29002]: -listennofork: Command line errors are not reported until a connection comes in.
Jun 27 16:10:34 pulsemaster guacd[28941]: User is not responding.
Jun 27 16:10:34 pulsemaster guacd[24552]: Connection "$12c5328c-c127-453d-bc9c-f631bf8e90f8" removed.
Jun 27 16:10:34 pulsemaster kernel: [717204.421339] guacd[28944]: segfault at 10 ip 00007f9ead26c692 sp 00007f9eaec7ad10 error 4 in libguac-client-vnc.so.0.0.0[7f9ead264000+13000]
Cordialement,
Nicolas Lécureuil
Web: http://www.siveo.net
Re: Segfault with guacamole 0.9.14
Posted by Nick Couchman <vn...@apache.org>.
On Wed, Jun 27, 2018 at 10:01 AM Nicolas Lécureuil <
nicolas.lecureuil@siveo.net> wrote:
> *Hi,
>
> i rebuilded guacd 0.9.14 ( using my own build debs )
>
> # dpkg -l | grep guac
> ii guacamole 0.9.14-4 all HTML5 web application for accessing remote desktops
> ii guacamole-auth-mysql 0.9.14-1 all Guacamole Mysql Identification
> ii guacd 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (proxy daemon)
> ii guacd-dbgsym 0.9.14-1 amd64 Debug symbols for guacd
> ii libguac-client-rdp0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (RDP support)
> ii libguac-client-rdp0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-rdp0
> ii libguac-client-ssh0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (SSH support)
> ii libguac-client-ssh0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-ssh0
> ii libguac-client-vnc0:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (VNC support)
> ii libguac-client-vnc0-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac-client-vnc0
> ii libguac-dev:amd64 0.9.14-1 amd64 Guacamole proxy daemon (core library headers)
> ii libguac11:amd64 0.9.14-1 amd64 HTML5 web application for accessing remote desktops (library)
> ii libguac11-dbgsym:amd64 0.9.14-1 amd64 Debug symbols for libguac11
> *
>
>
What version of the libvncserver/libvncclient are you building against?
> *
>
> Each time i use the vnc plugin i can see a segfault in the logs.
>
> Jun 27 14:48:28 pulsemaster kernel: [712278.556955] guacd[25572]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:49:35 pulsemaster kernel: [712345.817333] guacd[25612]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:50:41 pulsemaster kernel: [712412.051393] guacd[25655]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:51:47 pulsemaster kernel: [712477.883688] guacd[25700]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:52:54 pulsemaster kernel: [712544.755122] guacd[25746]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:54:03 pulsemaster kernel: [712613.432083] guacd[25794]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:55:08 pulsemaster kernel: [712678.871467] guacd[25836]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:55:29 pulsemaster kernel: [712699.432836] guacd[25883]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:57:39 pulsemaster kernel: [712829.633618] guacd[26029]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eacc76d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:58:35 pulsemaster kernel: [712885.994620] guacd[26072]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9ead477d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
> Jun 27 14:59:20 pulsemaster kernel: [712931.152907] guacd[26119]: segfault at 10 ip 00007f9eaea6f692 sp 00007f9eadc78d10 error 4 in libguac-client-vnc.so.0.0.0[7f9eaea67000+13000]
>
> I use a debian stretch.
> The vnc server is installed on a windows 10 ( TightVNC )*
>
> Any special configuration for VNC? Are you trying to use encryption?
Anything else different about your VNC server configuration? Have you
tried against other VNC servers on other target?
-Nick