RE: Possible bug in wait4(), 2.1.126-129 ?

Greaves Tristan TM (Tristan.Greaves@icl.com)
Mon, 23 Nov 1998 14:18:07 -0000


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Hi Ion,

> -----Original Message-----
> From: Ion Badulescu [mailto:ionut@moisil.cs.columbia.edu]
> Sent: Monday, November 23, 1998 11:52 AM
> To: Greaves Tristan TM
> Cc: 'H. J. Lu'; 'linux-kernel@vger.rutgers.edu'
> Subject: RE: Possible bug in wait4(), 2.1.126-129 ?
>
> Reproduced here (Intel 486/RH 5.1/Linux 2.0.35), using your
> original perl

> 2.0.35???? Are you sure? I think I'm going crazy...

tmg@discord ~ >uname -a
Linux discord.bra01.icl.co.uk 2.0.35 #6 Thu Oct 8 19:27:08 BST 1998 i486
unknown

> What versions of cron, ld-linux.so.2 and glibc do you have?

cron: vixie-cron-3.0.1-24
ld-linux.so.2: Not sure. What's the best way of determining this?
glibc: glibc-2.0.7-13

> Just for the peace of my mind, can you try running the C
> program I posted earlier and see if you get the same result?

Sure thing. Compiled with gcc.

Command line results:

tmg@discord ~ >./cronweirdness
tmg@discord ~ >

(I.e. no problems)

However, when run from a crontab the following is e-mailed to me:

wait4: No child processes

So there you go. Effectively the same behaviour.

> The only systems which fail the test are the RH51
> ones, all of which run a >= 2.1.126 kernel, so I can't really
> tell if 2.0 is ok on them.

Have you tried it with non- RH5.1 systems then? If so, it looks like
its a distribution problem and not a kernel one. Probably related to
the version of cron in use. Try installing a different crond and see
what happens.....

Tris.

---
Tristan Greaves                        (Systems Integrator) 
Enterprise Solutions                 
ICL                                  Tel: +44 (0)1344 472512 
Lovelace Road                     Mobile: +44 (0)7970 194624 
Bracknell RG12 8SN                  Mail: Tristan.Greaves@icl.com

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