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finger causing kernel seg fault



I use tmux on my server.  tmux creates multiple pttys.  When I run finger, I see an error like this:

$ finger
finger: /dev//pts/6: No such file or directory

and in the log, I see:

/var/log/syslog:Mar 15 05:06:18 strange kernel: [2740248.159942] finger[1987858]: segfault at 1c ip 000055b1c20baad5 sp 00007ffc8878b8b0 error 4 in finger[55b1c20b9000+3000] likely on CPU 1 (core 1, socket 0)
/var/log/syslog:Mar 15 05:06:18 strange kernel: [2740248.161979] Code: 7b 20 00 0f 85 cc fe ff ff 31 c0 48 8d 3d 80 18 00 00 e8 7e 0f 00 00 83 7b 08 01 0f 85 d0 fe ff ff 48 8d 7b 18 e8 8b e8 ff ff <8b> 70 1c 85 f6 0f 85 d0 00 00 00 8b 70 08 8b 50 04 85 f6 0f 85 f2

I do not see pts/6 being used:

$ w
 04:56:14 up 31 days, 17:01,  6 users,  load average: 0.68, 0.20, 0.06
USER     TTY      FROM               LOGIN@   IDLE   JCPU   PCPU WHAT
mgrant   pts/0    1.2.3.4            Tue12    7:53m  0.32s  0.32s -tcsh
mgrant   pts/1    1.2.3.4            03:57    3.00s  0.03s  0.03s tmux attach
mgrant   pts/2    tmux(1243630).%0   02Mar24  3.00s  0.18s  0.01s w
mgrant   pts/3    tmux(1243630).%1   02Mar24 12days 29.02s 29.02s emacs
mgrant   pts/4    tmux(1243630).%2   04Mar24 32:52m  0.05s  0.05s -bash

w reports one more user than there seems to be in the utmp.  I didn't close a tmux window but i have disconnected and reconnected several times.  If I start enough tmux windows and one happens to end up on the missing pts, the error goes away.  I'm not sure if this is a bug in finger, tmux, or something that manages the utmp getting out of sync.  Any ideas what to do about this?

Michael Grant

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