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Subjectis pid_namespace leak in v3.10?
I find pid_namespace leak by "cat /proc/slabinfo | grep pid_namespace".
The kernel version is RHEL 7.1 (kernel v3.10 stable).
The following is the test case, after several times, the count of pid_namespace
become very large, is it correct?

I also test mainline, and the count will increase too, but it seems stably later.

BTW, this patch doesn't help.
24c037ebf5723d4d9ab0996433cee4f96c292a4d
exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting

Thanks,
Xishi Qiu


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>

#ifndef CLONE_NEWPID
#define CLONE_NEWPID 0x20000000
#endif

void test(void)
{
printf("clone child\n");
exit(0);
}

int main()
{
pid_t pid, child_pid;
int i, status;
void *stack;

for (i = 0; i < 100; i++) {
stack = malloc(8192);
pid = clone(&test, (char *)stack + 8192, CLONE_NEWPID|SIGCHLD, 0);
}

sleep(5);

return 0;
}

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