This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1274917
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1274917
Title:
make sure https://bugzilla.kernel.org/show_bug.cgi?id=67651 is fixed
in Ubunut 14.04
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
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
...
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