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
...
---
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lightdm 7946 F.... pulseaudio
kcc 8585 F.... pulseaudio
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=3959574f-f6cb-4fcf-aa75-5394c06884fd
InstallationDate: Installed on 2014-01-31 (2 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 004: ID 0e0f:0008 VMware, Inc.
Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: VMware, Inc. VMware Virtual Platform
Package: linux (not installed)
ProcEnviron:
LANGUAGE=en_US
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-5-generic root=UUID=61da81e0-a5f8-45f4-96c2-6cfda9be652f ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.13.0-5-generic N/A
linux-backports-modules-3.13.0-5-generic N/A
linux-firmware 1.122
RfKill:
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
Tags: trusty
Uname: Linux 3.13.0-5-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 07/02/2012
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd07/02/2012:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
Wrong package.