[uml-devel] problems with 2.6.8.1 host kernel (skas3)

[Michael Richardson <mcr@sandelman.ottawa.on.ca>]

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We have been experiencing issues with un-killable T mode processes
on a 2.6.8.1 host with the 2.6.7 skas3 patch applied.

We also continue to have an issue with the /proc/PID/environ file not being
owned by the process involved. This keeps our automatic cleaner from
getting the processes which are strays. 

I wonder if these things are related.
I can leave this like this for awhile, but I will eventually have to
reboot.
We start/stop about 300 UMLs every night, so whatever is happening
doesn't happen that often.


[root@hulk 19744]# ps ax | grep linux
19744 ?        TW     0:02 [linux]
22251 ?        TW     0:02 [linux]
22584 ?        TW     0:00 [linux]
22820 ?        TW     0:00 [linux]
23148 ?        TW     0:00 [linux]
23382 ?        T      0:00 [linux]
23499 ?        TW     0:00 [linux]
23616 ?        TW     0:00 [linux]
23740 ?        T      0:02 [linux]
23840 ?        T      0:02 [linux]
24457 ?        T      0:00 [linux]
24698 ?        T      0:02 [linux]
30581 ?        TW     0:01 [linux]
 2098 ?        TW     0:00 [linux]
 2103 ?        TW     0:00 [linux]
 2408 ?        T      0:00 [linux]
 3680 ?        T      0:00 [linux]
13937 ?        T      0:00 [linux]
13956 ?        T      0:02 [linux]
14032 ?        T      0:00 [linux]
14038 ?        T      0:00 [linux]
14060 ?        T      0:02 [linux]

[root@hulk 19744]# pwd
/proc/19744

[root@hulk 19744]# ls -la 
ls: cannot read symbolic link exe: No such file or directory
total 0
dr-xr-xr-x    3 build    build           0 Oct  2 20:02 .
dr-xr-xr-x  113 root     root            0 Sep 17 23:38 ..
- -r--------    1 root     root            0 Oct  2 20:08 auxv
- -r--r--r--    1 root     root            0 Oct  2 20:02 cmdline
lrwxrwxrwx    1 root     root            0 Oct  2 20:08 cwd -> /btmp/build/HEAD/2004_09_18/openswan-2/testing/pluto/basic-pluto-02 (deleted)
- -r--------    1 root     root            0 Oct  2 20:02 environ
lrwxrwxrwx    1 root     root            0 Oct  2 20:08 exe
dr-x------    2 root     root            0 Oct  2 20:08 fd
- -r--r--r--    1 root     root            0 Oct  2 20:08 maps
- -rw-------    1 root     root            0 Oct  2 20:08 mem
- -r--r--r--    1 root     root            0 Oct  2 20:08 mounts
lrwxrwxrwx    1 root     root            0 Oct  2 20:08 root -> /
- -r--r--r--    1 root     root            0 Oct  2 20:02 stat
- -r--r--r--    1 root     root            0 Oct  2 20:02 statm
- -r--r--r--    1 root     root            0 Oct  2 20:02 status
dr-xr-xr-x    3 root     root            0 Oct  2 20:08 task
- -r--r--r--    1 root     root            0 Oct  2 20:08 wchan

[root@hulk root]# kill -9 19744
[root@hulk root]# kill -9 19744
[root@hulk root]# ps ax | grep 19744
19744 ?        TW     0:02 [linux]
22649 pts/62   S      0:00 grep 19744

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