Public bug reported: 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: ubiquity (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1274917 Title: make sure https://bugzilla.kernel.org/show_bug.cgi?id=67651 is fixed in Ubunut 14.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1274917/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs