Description of problem:
I used tmux as byobu backend. Two things were running in tmux when it crashed:

 * bash and journalctl -f
 * bash and btrfs scrub in foreground of a backup drive
 * several other bashes were idling

The scrub kept running in background for some time and finished without an error.

Version-Release number of selected component:
tmux-1.9a-2.fc20

Additional info:
reporter:       libreport-2.2.2
backtrace_rating: 4
cmdline:        tmux -2 -f /usr/share/byobu/profiles/tmuxrc new-session -n - /usr/bin/byobu-shell
crash_function: __tsearch
executable:     /usr/bin/tmux
kernel:         3.14.3-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #6 __tsearch at tsearch.c:280
 #7 __add_to_environ at setenv.c:212
 #8 __setenv at setenv.c:307
 #9 environ_push at environ.c:176
 #10 job_run at job.c:66
 #11 status_find_job at status.c:535
 #12 status_replace1 at status.c:386
 #13 status_replace at status.c:470
 #14 status_redraw_get_right at status.c:108
 #15 status_redraw at status.c:183