[Bug libc/10282] free() race in mcheck hooks

["pasky at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From pasky at suse dot cz  2009-06-15 22:37 -------
Created an attachment (id=4001)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4001&action=view)
deadlock-free proposed patch

Revised patch; unfortunately, the ATOMIC_FASTBINS stuff makes the code fairly
ugly now... getting rid of the #if 0 bit might help a little.

Without this patch, this crashes in few tens of seconds on my four-core when
run with MALLOC_CHECK_=3:

/* compile with -fopenmp */
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
#pragma omp parallel num_threads(256)
  while (1) {
    void *ptr = malloc(rand() % 65536);
    usleep((rand() % 100) * 100);
    free(ptr);
    usleep((rand() % 100) * 100);
  }
  return 0;
}

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
Attachment #3996 is|0                           |1
           obsolete|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=10282

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