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RE: cat /proc/registry/HKEY_PERFOMANCE_DATA/@ hangs


> -----Original Message-----
> From: Igor Pechtchanski 
> Sent: 13 July 2004 16:41

> On Tue, 13 Jul 2004, Dave Korn wrote:
> 
> > > -----Original Message-----
> > > From: cygwin-owner On Behalf Of Corinna Vinschen
> > > Sent: 13 July 2004 16:20
> >
> > > David,
> > >
> > > since that doesn't look too good, I tried it on NT4 SP6 as well as
> > > on XP SP1.  I can't reproduce the below problems in either system.
> > > Does that only happen on W2K perhaps?  Depending on the SP?
> > >
> > > Corinna
> >
> > XP, SP1.  But I haven't upgraded my .dll in a while:
> >
> > dk@mace /davek> uname -a
> > CYGWIN_NT-5.1 mace 1.5.7(0.109/3/2) 2004-01-30 19:32 i686 
> unknown unknown
> > Cygwin
> >
> > I notice however that Reini is using 1.5.10, so it's not 
> just a version
> > thing.  I'll try building cvs and see if it still happens.
> 
> Umm, Dave, I think you may be confused.

  Nope, not really.  Or not for that reason, anyway!

>  Reini's issue was that "cat
> /proc/registry/HKEY_PERFOMANCE_DATA" (yes, I didn't notice the typo
> before, interesting) 

  You also made a typo of your own there: he wasn't reading the key
"/proc/registry/HKEY_PERFOMANCE_DATA" but the default *value* for that key,
indicated by "/proc/registry/HKEY_PERFOMANCE_DATA/@"

>didn't terminate, which I, after reading MSDN,
> believe to be perfectly valid behavior.  He wasn't getting 
> any segfaults.

  I know.  I didn't say he was (getting segfaults).  I just pointed out a
couple of interesting things I discovered while trying to reproduce his bug.
I also explained why your interpretation of MSDN was incorrect.  A registry
key simply isn't something you can go on and on reading from.  There isn't a
single key anywhere in the registry that has any kind of EOF whatsoever, so
the lack of one on this particular key can't make the difference.  I didn't
get around to trying the actual cat instruction he quoted.  I'll try it now:

dk@mace ~> cat /proc/registry/HKEY_PERFOMANCE_DATA
Segmentation fault (core dumped)
dk@mace ~> cat /proc/registry/HKEY_PERFOMANCE_DATA/@

  And then it hangs, as described.  Takes (up to) 100%cpu, as well.  However
I find that unlike Reini, I can kill it easily enough:

  [Window 1]
dk@mace ~> cat /proc/registry/HKEY_PERFOMANCE_DATA/@
  [Hangs.  Meanwhile in window 2:]
dk@mace ~> ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
I    2464       1    2464       2464  con 11165 11:44:15 /usr/bin/bash
     3908       1    3908       3908  con 11165 16:03:39 /usr/bin/bash
      780    3908     780       3628  con 11165 16:34:03 /usr/bin/make
I    1028    3908     780       1076  con 11165 16:34:03 /usr/bin/tee
     3884       1    3884       3884  con 11165 16:45:18 /usr/bin/bash
     4008       1    4008       4008  con 11165 16:45:20 /usr/bin/bash
     2736     780     780       2772  con 11165 16:45:25 /usr/bin/sh
     3132    2736     780       2340  con 11165 16:45:25 /usr/bin/make
      244    3132     780       2440  con 11165 16:45:25 /usr/bin/sh
     3720     244     780        180  con 11165 16:45:25 /usr/bin/make
     1692    3720     780       2172  con 11165 16:46:06 /usr/bin/sh
     2384    1692     780       2936  con 11165 16:46:06 /usr/bin/gcc
     3412    2384     780       3412  con 11165 16:46:07 /usr/bin/gcc
     2596    3884    2596       1672  con 11165 16:46:07 /usr/bin/cat
     3380    4008    3380       2280  con 11165 16:46:26 /usr/bin/ps
dk@mace ~> kill 2596
dk@mace ~>
    [And back in window 1:]
dk@mace ~> cat /proc/registry/HKEY_PERFOMANCE_DATA/@
Terminated
dk@mace ~>

> FWIW, I can't reproduce your segfaults either, on Win2k SP3, but I can
> reproduce the behavior Reini reported.
> 	Igor

  Well, I get the segfaults *and* Reini's bug.  Guess I'm just lucky!

    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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