non-responding processes after truss(1)ing

[Jeremy Chadwick]

On Tue, Sep 27, 2011 at 12:57:11PM +0300, Nikos Vassiliadis wrote:
> My system have two non-responding processes after some truss(1)ing
> i did on them. They seem stopped and do not respond to sigcont.
> 
> >%ps
> >  PID  TT  STAT      TIME COMMAND
> > 9768   0- I      0:00.12 truss -p 9739
> > 9514   1  Is     0:00.29 -csh (csh)
> > 9739   1  TX+    2:06.24 sqlite3 ../nikos_output_actives.tst/database.db
> > 7821   4- TX+    0:33.62 python active.py
> > 7828   4- I      0:00.57 truss -p 7821
> > 9848   5  Ss     0:00.23 -csh (csh)
> >10053   5  R+     0:00.00 ps
> >%
> 
> it's not actually 8.2-STABLE, but 8.2-RELEASE-p1, are there any
> fixes in -STABLE regarding this problem?

kill -9 your truss processes; the underlying processes which you are
truss'ing will probably resume.

My experience for years has been that truss on FreeBSD is extremely
buggy and cannot be relied upon (case in point).  Such is still the case
on RELENG_8 as of today.

Use ktrace(1) instead.  You'll find it to work pretty much in every
situation.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, US |
| Making life hard for others since 1977.               PGP 4BD6C0CB |