Ubuntu
linux package

  1. Bug #894070
  2. Comment #23

Comment 23 for bug 894070

Revision history for this message
In , Philip (philip-redhat-bugs) wrote :

Description of problem:
/var/log/messages fills all disk space with error messages from DMAR.
HW is Lenovo T410 with Intel CORE i5 cpu.

How reproducible:
100% failure when feature activated in BIOS before booting Fedora.
No failure when feature deactivated in BIOS before booting Fedora.

Steps to Reproduce:
1. Power off system
2. Power on system and enter BIOS setup
3. From CPU option, enable VT-d feature
4. Save BIOS settings & boot system

Actual results:
Error messages flood /var/log/messages (1+ set of messages follows):
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02] Pce [0d:00.0] fault addr fce [0d:00.0] fault addr fffDMAR:[fault reace [0d:00.0] fault addr ce [0d:00.0] fault addr fffffDMAR:[fault reasce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02] Prce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reasonce [0d:00.0] fault addr DMAR:[fault reasce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02]ce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02] Present bice [0d:00.0] fault adce [0d:00.0] fault addr fffff000 DMAR:[fault reasce [0d:00.0] fault addr fffff000DMAR:[fault rece [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02] Present bit in contexce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMARce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 0ce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reason 02] Prce [0d:00.0] fault addr fffff000
Jun 19 00:38:11 PLS-T410 kernel: DMAR:[fault reasonce [0d:00.0] fault addr fffff000

Expected results:
No error messages from DMAR

Additional info:
from messages file:
Linux version 2.6.33.3-85.fc13.x86_64 (<email address hidden>) (gcc version 4.4.4 20100503 (Red Hat 4.4.4-2) (GCC) ) #1 SMP Thu May 6 18:09:49 UTC 2010

kernel: CPU0: Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz stepping 02
kernel: Booting Node 0, Processors #1
kernel: CPU 1 MCA banks SHD:2 SHD:3 SHD:5 SHD:6
kernel: #2
kernel: CPU 2 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6
kernel: #3 Ok.
kernel: CPU 3 MCA banks SHD:2 SHD:3 SHD:5 SHD:6
kernel: Brought up 4 CPUs
kernel: Total of 4 processors activated (19150.66 BogoMIPS).

Temporary resolution:
1. Start system from power off state and enter BIOS setup
2. Deactivate VT-d feature
3. Save configuration and reboot.