dovecot - Oct 2012 - memory allocation in new thread

Hi! I have some problems with memory allocation.
I create new thread in cidir storage and call malloc(), and it fails to allocate
even 1 byte.
What can cause this problem?

Dovecot vesrion is: 2.1.10 (130563b592c9+)

Sample code looks like this (I also link to pthread with: -pthread):

#define TEST_MALLOC() \
{ \
??? void *p; \
???  p = malloc(1); \
???  if (!p) { \
???  ??? i_info("%s: malloc() failed", __FUNCTION__); \
???  } else { \
??? ???  i_info("%s: malloc() succeeded", __FUNCTION__); \
???  ??? free(p); \
???  } \
}

#include <pthread.h>

static void *test_pthread_malloc_func(void *data_)
{
???  TEST_MALLOC();
???  return NULL;
}

static void test_pthread_malloc()
{
???  int ret;
???  pthread_t tid;
???  TEST_MALLOC();
???  ret = pthread_create(&tid, NULL, test_pthread_malloc_func, NULL);
???  if (ret) {
???????  i_info("failed to start thread");
???  } else {
???????  pthread_join(tid, NULL);
???  }
}

I call test_pthread_malloc() function.
It produces following output:

Oct 11 12:56:15 imap(guest): Info: test_pthread_malloc: malloc() succeeded
Oct 11 12:56:15 imap(guest): Info: test_pthread_malloc_func: malloc() failed

On 11.10.2012, at 13.21, . . wrote:
> Hi! I have some problems with memory allocation.
> I create new thread in cidir storage and call malloc(), and it fails to
allocate even 1 byte.
> What can cause this problem?
No idea. Dovecot in general isn't designed to work with threads.
> Oct 11 12:56:15 imap(guest): Info: test_pthread_malloc: malloc() succeeded
> Oct 11 12:56:15 imap(guest): Info: test_pthread_malloc_func: malloc()
failed
Well, or the one thing I can think of you to try: Set default_vsz_limit=0

Also straceing the process could show what exactly fails.