[GUACAMOLE-803] crash seen in guacd 0.9.14 when resizing SSH terminal

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Invalid
• Affects Version/s: 0.9.14
• Component/s: guacd
• Environment: OS: Linux ; H/W: X86_64
• Assignee: Unassigned
• Reporter: narayanan ms
• Created: 27/May/19 04:51
• Updated: 14/Aug/19 01:02
• Resolved: 14/Aug/19 01:02

Description

Hi All,

We are using guacd 0.9.14 in our devices.
We see a scenario where guacamole crashes, below is the backtrace for the same,

Core was generated by `/usr/sbin/guacd -u -b 127.0.0.1 -L debug -f'.
Program terminated with signal 11, Segmentation fault.
#0 0x005e1af6 in __memmove_ssse3 () from /lib/libc.so.6
(gdb) bt
#0 0x005e1af6 in __memmove_ssse3 () from /lib/libc.so.6
#1 0x00a2532a in guac_terminal_display_copy_rows () from /lib/libguac-client-ssh.so
#2 0x00a280d7 in guac_terminal_resize () from /lib/libguac-client-ssh.so
#3 0x00a1b490 in guac_ssh_user_size_handler () from /lib/libguac-client-ssh.so
#4 0x00e1638a in __guac_handle_size () from /lib/libguac.so.12
#5 0x00e15458 in guac_user_handle_instruction () from /lib/libguac.so.12
#6 0x00e16b99 in ?? () from /lib/libguac.so.12
#7 0x00c8abc9 in start_thread () from /lib/libpthread.so.0
#8 0x0058de3e in clone () from /lib/libc.so.6
(gdb)

The guacd crash seems like happening when SSH terminal is resized. This issue is not very frequent and difficult to reproduce. We are using a stripped binary, so in above backtrace, we dont see any symbols,args etc. Are you aware of any guacd crash that looks like above, what further could be checked here?

Thank you,
Narayanan M S