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[Launchpad Bug Tracker <1274917@xxxxxxxxxxxxxxxxxx>]

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The current 14.04 candidate uses the kernel version that suffers from a bug described here:
https://bugzilla.kernel.org/show_bug.cgi?id=67651
Please make sure to pull the kernel with the fix before the 14.04 release. 

here is a small test case that would fail if the bug is present:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <assert.h>
int main() {
  char *p = (char*)0x600000000000;
  size_t i;
  for (i = 0; i < 100000; i++) {
    void *addr = p + i * 4096;
    void *ret = mmap(addr, 4096, PROT_WRITE | PROT_READ,
                     MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
    if (addr != ret) {
      fprintf(stderr, "failed at iteration %zd\n", i);
      char command[100];
      snprintf(command, sizeof(command), "cat /proc/%d/maps | head -30", getpid());
      system(command);
      return 1;
    }
  }
}


On a broken kernel it will print something like this:

failed at iteration 65514
00400000-00401000 r-xp 00000000 fc:00 20991316  /tmp/a.out
00600000-00601000 r--p 00000000 fc:00 20991316  /tmp/a.out
00601000-00602000 rw-p 00001000 fc:00 20991316  /tmp/a.out
600000000000-600000001000 rw-p 00000000 00:00 0 
600000001000-600000002000 rw-p 00000000 00:00 0 
600000002000-600000003000 rw-p 00000000 00:00 0 
600000003000-600000004000 rw-p 00000000 00:00 0 
600000004000-600000005000 rw-p 00000000 00:00 0 
...

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
make sure https://bugzilla.kernel.org/show_bug.cgi?id=67651 is fixed in Ubunut 14.04
https://bugs.launchpad.net/bugs/1274917
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