Re: problem (bug?) with glibc' exec function
hi.
i noticed a strange bug while using debian/glibc. u can identify the problem from the mailings i had with a guy from the debian newsgroup linux.debian.maint.glibc. maybe one of u guys has an idea to resolve this.
best regards,
henning
--- aurelien@aurel32.net wrote:
From: Aurelien Jarno <aurelien@aurel32.net>
To: Henning <Plazmakeks@stonerrock.net>
Subject: Re: problem (bug?) with glibc' exec function
Date: Tue, 22 Apr 2008 12:18:28 +0200
On Fri, Apr 18, 2008 at 09:37:36AM -0700, Henning wrote:
> > plazmakeks@stonerrock.net a écrit :
> > > hi,
> > >
> > > i got the following settings:
> > >
> > > os: Linux blubb 2.6.15-1-686 #2 Mon Mar 6 15:27:08 UTC 2006 i686 GNU/
> > > Linux
> > > g++: gcc version 4.0.4 20060507 (prerelease) (Debian 4.0.3-3)
> > > java: java version "1.6.0_05"
> > > Java(TM) SE Runtime Environment (build 1.6.0_05-b13)
> > > Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing)
> > > glibc: 2.7
> > >
> > > i got a java application from which i start os processes using c/c++
> > > via JNI. every 'job' consists of a 'wrap script' and an 'application
> > > script'. my c function forks the current process and replaces the
> > > image
> > > with the execl() function, in which the 'wrap script' is called as a
> > > bash script. the 'wrap script' then calls the 'application script' and
> > > does other stuff.
> > >
> > > i did some masstests the last days. i started about 1000 'jobs' in a
> > > loop.
> > >
> > > execl() definition says, that the function replaces the current
> > > process image with the delivered one. if the function succeeds it
> > > doesnt return, if it fails it will return. however if i start lots of
> > > jobs concurrently there are some 'jobs' which's process image isnt
> > > replaced by the delivered bash script call to execl(), you can see it
> > > by using the 'ps ax' command in the shell which shows several jvm
> > > instances running, related to the number of failed-started 'jobs'. but
> > > if the execl() function fails and the process image isnt replaced, the
> > > execl() function neither returns a value. so i guess there is a bug.
> > > any suggestions?
> >
> > execl is just a wrapper around the execve syscall. This is most likely a
> > problem of resources on your system.
> >
> > Just check errno to see what happens exactly.
> >
> > --
> > .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
> > : :' : Debian developer | Electrical Engineer
> > `. `' aurel32@debian.org | aurelien@aurel32.net
> > `- people.debian.org/~aurel32 | www.aurel32.net
> >
> >
> > i can't access errno cause execl doesnt return
> >
>
> Then it is most probably a kernel problem.
>
> --
> .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
> : :' : Debian developer | Electrical Engineer
> `. `' aurel32@debian.org | aurelien@aurel32.net
> `- people.debian.org/~aurel32 | www.aurel32.net
>
>
> is it known or even documented? how will u proceed with this bug? id like to be inform if u got new information.
>
I have no idea if it is a know bug or not. You should contact kernel
people to get more information.
Aurelien
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' aurel32@debian.org | aurelien@aurel32.net
`- people.debian.org/~aurel32 | www.aurel32.net
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