Re: Segfault with guacamole 0.9.14
On Wed, Jun 27, 2018 at 12:47 PM, Mike Jumper wrote: > On Wed, Jun 27, 2018 at 7:20 AM, Nicolas Lécureuil > 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 7f9ead26c692 sp 7f9eaec7ad10 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
On Wed, Jun 27, 2018 at 7:20 AM, Nicolas Lécureuil 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 7f9ead26c692 sp 7f9eaec7ad10 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
> > 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 > HmmmI 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 7f9ead26c692 sp 7f9eaec7ad10 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
> Le 27 juin 2018 à 16:11, Nick Couchman a écrit : > > > > On Wed, Jun 27, 2018 at 10:01 AM Nicolas Lécureuil > mailto:nicolas.lecure...@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-mysql0.9.14-1 > > all Guacamole Mysql Identification > > ii guacd 0.9.14-1 > > amd64HTML5 web application for accessing remote > > desktops (proxy daemon) > > ii guacd-dbgsym0.9.14-1 > > amd64Debug symbols for guacd > > ii libguac-client-rdp0:amd64 0.9.14-1 > > amd64HTML5 web application for accessing remote > > desktops (RDP support) > > ii libguac-client-rdp0-dbgsym:amd640.9.14-1 > > amd64Debug symbols for libguac-client-rdp0 > > ii libguac-client-ssh0:amd64 0.9.14-1 > > amd64HTML5 web application for accessing remote > > desktops (SSH support) > > ii libguac-client-ssh0-dbgsym:amd640.9.14-1 > > amd64Debug symbols for libguac-client-ssh0 > > ii libguac-client-vnc0:amd64 0.9.14-1 > > amd64HTML5 web application for accessing remote > > desktops (VNC support) > > ii libguac-client-vnc0-dbgsym:amd640.9.14-1 > > amd64Debug symbols for libguac-client-vnc0 > > ii libguac-dev:amd64 0.9.14-1 > > amd64Guacamole proxy daemon (core library > > headers) > > ii libguac11:amd64 0.9.14-1 > > amd64HTML5 web application for accessing remote > > desktops (library) > > ii libguac11-dbgsym:amd64 0.9.14-1 > > amd64Debug 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 error 4 in > > libguac-client-vnc.so.0.0.0[7f9eaea67000+13000] > > > > I use a debian stretch. > > The vnc server is
Re: Segfault with guacamole 0.9.14
On Wed, Jun 27, 2018 at 10:01 AM Nicolas Lécureuil < nicolas.lecure...@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-mysql0.9.14-1 > all Guacamole Mysql Identification > ii guacd 0.9.14-1 > amd64HTML5 web application for accessing remote desktops > (proxy daemon) > ii guacd-dbgsym0.9.14-1 > amd64Debug symbols for guacd > ii libguac-client-rdp0:amd64 0.9.14-1 > amd64HTML5 web application for accessing remote desktops > (RDP support) > ii libguac-client-rdp0-dbgsym:amd640.9.14-1 > amd64Debug symbols for libguac-client-rdp0 > ii libguac-client-ssh0:amd64 0.9.14-1 > amd64HTML5 web application for accessing remote desktops > (SSH support) > ii libguac-client-ssh0-dbgsym:amd640.9.14-1 > amd64Debug symbols for libguac-client-ssh0 > ii libguac-client-vnc0:amd64 0.9.14-1 > amd64HTML5 web application for accessing remote desktops > (VNC support) > ii libguac-client-vnc0-dbgsym:amd640.9.14-1 > amd64Debug symbols for libguac-client-vnc0 > ii libguac-dev:amd64 0.9.14-1 > amd64Guacamole proxy daemon (core library headers) > ii libguac11:amd64 0.9.14-1 > amd64HTML5 web application for accessing remote desktops > (library) > ii libguac11-dbgsym:amd64 0.9.14-1 > amd64Debug 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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
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-mysql0.9.14-1 all Guacamole Mysql Identification ii guacd 0.9.14-1 amd64HTML5 web application for accessing remote desktops (proxy daemon) ii guacd-dbgsym0.9.14-1 amd64Debug symbols for guacd ii libguac-client-rdp0:amd64 0.9.14-1 amd64HTML5 web application for accessing remote desktops (RDP support) ii libguac-client-rdp0-dbgsym:amd640.9.14-1 amd64Debug symbols for libguac-client-rdp0 ii libguac-client-ssh0:amd64 0.9.14-1 amd64HTML5 web application for accessing remote desktops (SSH support) ii libguac-client-ssh0-dbgsym:amd640.9.14-1 amd64Debug symbols for libguac-client-ssh0 ii libguac-client-vnc0:amd64 0.9.14-1 amd64HTML5 web application for accessing remote desktops (VNC support) ii libguac-client-vnc0-dbgsym:amd640.9.14-1 amd64Debug symbols for libguac-client-vnc0 ii libguac-dev:amd64 0.9.14-1 amd64Guacamole proxy daemon (core library headers) ii libguac11:amd64 0.9.14-1 amd64HTML5 web application for accessing remote desktops (library) ii libguac11-dbgsym:amd64 0.9.14-1 amd64Debug 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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 7f9eaea6f692 sp 7f9eacc76d10 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 7f9eaea6f692 sp 7f9ead477d10 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 7f9eaea6f692 sp 7f9eadc78d10 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.
