Ah ha, when firefox browses a pdf, then pstree can't see it.
$ ps -e|grep xpdf
2507 ? 00:00:01 xpdf.bin
And
$ pstree -plA
|-xcinterm-big5(2349)---crxvt-big5(2350)---bash(2351)---pstree(2524)
`-xdm(2207)-+-XFree86(2221)
`-xdm(2222)---sh(2247)-+-icewm(2300)
|-sh(2294)---firefox-bin(2357)
|-sh(2298)---emacs(2365)-+-emacsserver(2376)
$ pstree -plA|grep 2507
$
C> Is there something unusual about the kernel you are running?
2.6.8-2-k7
C> Can you send me the stat and status files of one of the xpdf processes,
$ more /proc/2507/stat*|cat
::::::::::::::
/proc/2507/stat
::::::::::::::
2507 (xpdf.bin) S 2506 2247 2207 0 -1 0 22986 0 1 0 144 54 0 0 16 0 1 0 153256
22642688 2286 4294967295 134512640 135243276 3221224080 3221223024 1079579832 0
0 4096 0 0 0 0 17 0 0 0
::::::::::::::
/proc/2507/statm
::::::::::::::
5528 2286 4345 222 0 5306 0
::::::::::::::
/proc/2507/status
::::::::::::::
Name: xpdf.bin
State: S (sleeping)
SleepAVG: 90%
Tgid: 2507
Pid: 2507
PPid: 2506
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
FDSize: 256
Groups: 20 24 29 1000 1004
VmSize: 22112 kB
VmLck: 0 kB
VmRSS: 9144 kB
VmData: 4696 kB
VmStk: 36 kB
VmExe: 716 kB
VmLib: 5972 kB
Threads: 1
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001000
SigCgt: 0000000000000000
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
C> someone suggested you may have a terminal with not many columns and the
C> xpdf was found "off the screen".
hurmf. P.S.,
$ head /proc/2506/status
Name: firefox-bin
State: S (sleeping)
SleepAVG: 79%
Tgid: 2357
Pid: 2506
PPid: 2357
$ xpdf & #start another
$ ps -e|grep xpdf
2507 ? 00:00:01 xpdf.bin
2540 pts/0 00:00:00 xpdf.bin
$ pstree -plA|grep xpdf
| `-xpdf.bin(2540)
$ ls /proc/2507/fd/ /proc/2540/fd/
/proc/2507/fd/:
0 10 12 14 17 19 20 22 24 26 3 5 7
1 11 13 15 18 2 21 23 25 27 4 6 8
/proc/2540/fd/:
0 1 2 3
$ ls /proc/2540/fd/[0-3] -og
lrwx------ 1 64 2005-03-09 23:55 /proc/2540/fd/0 -> /dev/pts/0
lrwx------ 1 64 2005-03-09 23:55 /proc/2540/fd/1 -> /dev/pts/0
lrwx------ 1 64 2005-03-09 23:52 /proc/2540/fd/2 -> /dev/pts/0
lrwx------ 1 64 2005-03-09 23:55 /proc/2540/fd/3 -> socket:[14302]
$ ls /proc/2507/fd/[0-3] -og
lr-x------ 1 64 2005-03-09 23:54 /proc/2507/fd/0 -> /dev/null
l-wx------ 1 64 2005-03-09 23:54 /proc/2507/fd/1 ->
/home/jidanni/.xsession-errors
l-wx------ 1 64 2005-03-09 23:54 /proc/2507/fd/2 ->
/home/jidanni/.xsession-errors
lrwx------ 1 64 2005-03-09 23:54 /proc/2507/fd/3 -> socket:[11013]
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