On 25-10-19 13:09, Andreas Schneider wrote:
On Friday, 25 October 2019 11:11:32 CEST Alexander Bokovoy wrote:
On pe, 25 loka 2019, Kees Bakker wrote:
On 24-10-19 16:12, Alexander Bokovoy wrote:
On to, 24 loka 2019, Kees Bakker via FreeIPA-users wrote:
Hey,
With x2go [1] you can start a remote desktop. Going from UNIX (client) to
UNIX (server) it will use SSH behinds the scenes.
However, on a IPA client the x2goclient command fails with a segfault
(somewhere in a ssh library). This is caused by the modified
/etc/ssh/ssh_config. More specifically this
ProxyCommand /usr/bin/sss_ssh_knownhostsproxy -p %p %h
When you disable this line the x2go connection succeeds.
[1] https://wiki.x2go.org/doku.php
If you could install debug packages and generate a backtrace, that would
be great as it would help to understand where it happens. Thanks in
advance!
Hey Alexander,
The segfault is in a library of the libssh-4 package. I don't know if that
is something you wanted to be involved with. Anyway, here is the stack
strace of the segfault.
Thanks. So the crash is in ssh_poll_set_events(). Andreas, do you have
any ideas?
Where is libssh installed from? It looks like this is libssh 0.8.0.
It's Ubuntu 18.04.3 and the libraries are from the normal
distribution source.
https://packages.ubuntu.com/search?keywords=libssh
# dpkg -l libssh\*|cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-=====================-==================================-============-===================================
ii libssh-4:amd64 0.8.0~20170825.94fa1e38-1ubuntu0.2 amd64 tiny C SSH
library (OpenSSL flavor)
ii libssh-4-dbgsym:amd64 0.8.0~20170825.94fa1e38-1ubuntu0.2 amd64 debug
symbols for libssh-4
un libssh-dbg <none> <none> (no description
available)
ii libssh-gcrypt-4:amd64 0.8.0~20170825.94fa1e38-1ubuntu0.2 amd64 tiny
C SSH library (gcrypt flavor)
ii libssh2-1:amd64 1.8.0-1 amd64 SSH2
client-side library
# apt policy libssh-4
libssh-4:
Installed: 0.8.0~20170825.94fa1e38-1ubuntu0.2
Candidate: 0.8.0~20170825.94fa1e38-1ubuntu0.2
Version table:
*** 0.8.0~20170825.94fa1e38-1ubuntu0.2 500
500 http://nl.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
0.8.0~20170825.94fa1e38-1build1 500
500 http://nl.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
segfault at 4 ip 00007f6e7e0d5eeb sp 00007f6e64e6ea88 error 6 in
libssh.so.4.5.0
After installing the dgbsym package and running from gdb I could get a
stack trace
Thread 6 "SshMasterConnec" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffdf1a0700 (LWP 14736)]
0x00007ffff7b89eeb in ssh_poll_set_events (p=0x7fffd40076b0, events=4) at
./src/poll.c:349 349 ./src/poll.c: No such file or directory.
(gdb) where
#0 0x00007ffff7b89eeb in ssh_poll_set_events (p=0x7fffd40076b0, events=4)
at ./src/poll.c:349 #1 0x00007ffff7b8d3c8 in ssh_socket_unbuffered_write
(len=<optimized out>, buffer=<optimized out>, s=0x7fffd4003850) at
./src/socket.c:574
#2 ssh_socket_nonblocking_flush (s=s@entry=0x7fffd4003850) at
./src/socket.c:667 #3 0x00007ffff7b8d4c4 in ssh_socket_write
(s=0x7fffd4003850, buffer=<optimized out>, len=len@entry=64) at
./src/socket.c:628
#4 0x00007ffff7b846c3 in ssh_packet_write (session=0x7fffd4004bc0,
session=0x7fffd4004bc0) at ./src/packet.c:1316 #5 packet_send2
(session=session@entry=0x7fffd4004bc0) at ./src/packet.c:1386 #6
0x00007ffff7b85315 in ssh_packet_send
(session=session@entry=0x7fffd4004bc0) at ./src/packet.c:1411 #7
0x00007ffff7b72d69 in channel_write_common (channel=0x7fffd40112e0,
data=0x7fffdf11fce0, len=6, is_stderr=0) at ./src/channels.c:1357
#8 0x0000555555640cc3 in ?? ()
#9 0x0000555555644745 in ?? ()
#10 0x00007ffff581de3c in ?? () from
/usr/lib/x86_64-linux-gnu/libQtCore.so.4 #11 0x00007ffff558b6db in
start_thread (arg=0x7fffdf1a0700) at pthread_create.c:463 #12
0x00007ffff4d1388f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
_______________________________________________
FreeIPA-users mailing list -- freeipa-users@lists.fedorahosted.org
To unsubscribe send an email to freeipa-users-le...@lists.fedorahosted.org
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedorahosted.org/archives/list/freeipa-users@lists.fedorahosted.org
