Quoting Jean-Marc Pigeon (jmp@xxxxxxx):
> Hello,
>
> Same physical system and configuration
> (small system in 32 Bits i686 mode).
> 2.6.32.3: working A_one.
> 2.6.33-rc4: clone call, looping and
> taking ALL CPU cycle.
>
> Here is code used.
> ;======================================
> cloneflg=SIGCHLD|__WCLONE;
> cloneflg|=CLONE_NEWNET|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|
> CLONE_NEWUTS;
> clonestk=(char *)malloc(STKSIZE)
> ......
>
> ;--------------------------------------
> if (argv[0]!=(char *)0) { /*always */
> static ARGTYP args;
>
> args.mspid=getpid();
> args.arch=cntarch;
> args.argc=argc;
> args.argv=argv;
> if ((cpid=clone(&doboot,(void *)(clonestk
> +STKSIZE),cloneflg,(void *)&args))<0) {
> (void) apl_alert(0,"%s, Unable to clone %s container process
> (error=<%s>)",
> appname,argv[0],strerror(errno));
> ;======================================
>
> There is some difference within .config file between
> both kernel I regenerated, but I do not believe they
> are meaningful for the clone/cgroup/veth/bridge functions.
> I can provide config diff if needed.
>
> Do we have a real problem with 2.6.33-rc4?? or did I missed
> something? could someone confirm trouble with clone call?
I don't see any such problem (on s390). You leave a large chunk
of your code out of your email, though. What is STKSIZE? What
is ARGTYP? What does doboot do?
The following program verbatim (trying to mimick what I hope your
program looks like) did not give me any problems:
===============================================================
#include <stdio.h>
#include <malloc.h>
#include <signal.h>
#include <wait.h>
#include <sched.h>
#include <errno.h>
#include <linux/sched.h>
#define STKSIZE (4*getpagesize())
#define CLONE_NEWNET 0x40000000 /* New network namespace */
struct arg {
int a, b;
};
int fn(void *arg)
{
struct arg *a = arg;
printf("client a %d b %d\n", a->a, a->b);
}
int main()
{
struct arg a;
int cpid;
long cloneflg=SIGCHLD|__WCLONE;
void *clonestk;
cloneflg|=CLONE_NEWNET|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS;
clonestk=(char *)malloc(STKSIZE);
a.a=1; a.b=2;
if ((cpid=clone(&fn, clonestk+STKSIZE, cloneflg,
(void *)&a)) < 0)
printf("Error %d on clone\n", errno);
printf("parent done\n");
}
===============================================================
-serge
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