Public bug reported:
This is on a Xubuntu 7.04 machine functioning as an LTSP server.
#uname -a
Linux halorentz-acss 2.6.20-16-server #2 SMP Sun Sep 23 19:57:25 UTC 2007 i686
GNU/Linux
User authentication is done via an LDAP server. The /home directory is
mounted over NFS from another server and users can mount their USB flash
drives from the LTSP clients using LTSPFS.
On rare occasions I will find that running 'ps' will hang and the
terminal becomes non-responsive. If I run 'ps awx' I get a list of
processes which stops just before the "offending" process. If I then
list the contents of /proc I can find the offending process ID (the next
process numerically) and find out who owns it. However running 'cat' on
the process's /proc cmdline file will also hang. (e.g. 'cat
/proc/821/cmdline' hangs and the terminal becomes non-responsive). I can
run top, but if I hit "c" to list the command line details then top
hangs as well.
In the current case the offending process is "Thunar". I believe it was
in the previous cases as well, but I don't recall for sure. Looking via
top at the user's processes I can see that they have logged out, but
there are a couple processes left:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
821 xxxxxxx 15 0 75608 13m 9356 D 0 0.2 0:01.01 Thunar
824 xxxxxxx 15 0 2680 1212 884 S 0 0.0 0:00.32 gam_server
1144 xxxxxxx 20 0 77848 1056 384 S 0 0.0 0:00.10 ltspfs
1750 xxxxxxx 25 0 1716 524 444 S 0 0.0 0:00.01 soffice
1766 xxxxxxx 15 0 203m 81m 58m D 0 1.0 0:14.87 soffice.bin
7162 xxxxxxx 15 0 0 0 0 Z 0 0.0 0:00.63 Thunar <defunct>
8770 xxxxxxx 15 0 0 0 0 Z 0 0.0 0:00.76 Thunar <defunct>
In this case it seems to be process 821 that is causing the problem.
I don't know how to reproduce this effect.
Killing the process returns everything to normal, but it seems to take
quite a while to get it to quit. I tried several times before
succeeding. Running 'pkill -9 -u xxxxxxx' seemed to do the trick.
** Affects: ubuntu
Importance: Undecided
Status: New
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Querying Thunar /proc directory causes hang
https://bugs.launchpad.net/bugs/162448
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