You have been subscribed to a public bug:
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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