memory mtrr problem with ubuntu 9.04

[Morten P.D. Stevens]

Hi,

after installing and testing ubuntu server 9.04 on one of our IBM System
x3400 servers i get this dmesg error:

[    0.000000] BIOS EBDA/lowmem at: 0009c400/0009c400
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.28-11-server (buildd at crested) (gcc version
4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC 2009
(Ubuntu 2.6.28-11.37-server)
[    0.000000] Command line: root=/dev/mapper/ubuntu--server-root ro quiet
splash 
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Centaur CentaurHauls
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 000000000009c400 (usable)
[    0.000000]  BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved)
[    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 00000000bff60000 (usable)
[    0.000000]  BIOS-e820: 00000000bff60000 - 00000000bff6a000 (ACPI data)
[    0.000000]  BIOS-e820: 00000000bff6a000 - 00000000bff80000 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
[    0.000000]  BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
[    0.000000]  BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
[    0.000000] DMI present.
[    0.000000] last_pfn = 0x140000 max_arch_pfn = 0x3ffffffff
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: at
/build/buildd/linux-2.6.28/arch/x86/kernel/cpu/mtrr/generic.c:411
generic_get_mtrr+0xfa/0x130()
[    0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up.
[    0.000000] Modules linked in:
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.28-11-server #37-Ubuntu
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff80250927>] warn_slowpath+0xb7/0xf0
[    0.000000]  [<ffffffff8041ea88>] ? sprintf+0x68/0x70
[    0.000000]  [<ffffffff8041e5d8>] ? vsnprintf+0x2e8/0x730
[    0.000000]  [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20
[    0.000000]  [<ffffffff8069eaf8>] ? _spin_unlock_irqrestore+0x18/0x20
[    0.000000]  [<ffffffff8025124d>] ? release_console_sem+0x1dd/0x230
[    0.000000]  [<ffffffff8025172c>] ? vprintk+0x19c/0x400
[    0.000000]  [<ffffffff80a1aa16>] ? dmi_save_one_device+0x79/0xb4
[    0.000000]  [<ffffffff80220c6a>] generic_get_mtrr+0xfa/0x130
[    0.000000]  [<ffffffff809f7215>] mtrr_trim_uncached_memory+0xa3/0x331
[    0.000000]  [<ffffffff809f26c4>] setup_arch+0x5c6/0x902
[    0.000000]  [<ffffffff80273822>] ?
clockevents_register_notifier+0x42/0x60
[    0.000000]  [<ffffffff809e9b33>] start_kernel+0x6e/0x3b2
[    0.000000]  [<ffffffff809e92b4>] x86_64_start_reservations+0x94/0xb9
[    0.000000]  [<ffffffff809e93ee>] x86_64_start_kernel+0xf2/0x101
[    0.000000]  [<ffffffff809e9140>] ? early_idt_handler+0x0/0x71
[    0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
[    0.000000] last_pfn = 0xbff60 max_arch_pfn = 0x3ffffffff
[    0.000000] Scanning 2 areas for low memory corruption
[    0.000000] modified physical RAM map:
[    0.000000]  modified: 0000000000000000 - 0000000000001000 (usable)
[    0.000000]  modified: 0000000000001000 - 0000000000006000 (reserved)
[    0.000000]  modified: 0000000000006000 - 0000000000008000 (usable)
[    0.000000]  modified: 0000000000008000 - 0000000000010000 (reserved)
[    0.000000]  modified: 0000000000010000 - 000000000008f400 (usable)
[    0.000000]  modified: 000000000009c400 - 00000000000a0000 (reserved)
[    0.000000]  modified: 00000000000e0000 - 0000000000100000 (reserved)
[    0.000000]  modified: 0000000000100000 - 00000000bff60000 (usable)
[    0.000000]  modified: 00000000bff60000 - 00000000bff6a000 (ACPI data)
[    0.000000]  modified: 00000000bff6a000 - 00000000bff80000 (ACPI NVS)
[    0.000000]  modified: 00000000bff80000 - 00000000c0000000 (reserved)
[    0.000000]  modified: 00000000e0000000 - 00000000f0000000 (reserved)
[    0.000000]  modified: 00000000fec00000 - 00000000fec10000 (reserved)
[    0.000000]  modified: 00000000fee00000 - 00000000fee01000 (reserved)
[    0.000000]  modified: 00000000ff000000 - 0000000100000000 (reserved)
[    0.000000]  modified: 0000000100000000 - 0000000140000000 (usable)
[    0.000000] init_memory_mapping: 0000000000000000-00000000bff60000
[    0.000000]  0000000000 - 00bfe00000 page 2M
[    0.000000]  00bfe00000 - 00bff60000 page 4k
[    0.000000] kernel direct mapping tables up to bff60000 @ 10000-15000
[    0.000000] last_map_addr: bff60000 end: bff60000
[    0.000000] init_memory_mapping: 0000000100000000-0000000140000000
[    0.000000]  0100000000 - 0140000000 page 2M
[    0.000000] kernel direct mapping tables up to 140000000 @ 13000-19000
[    0.000000] last_map_addr: 140000000 end: 140000000
[    0.000000] RAMDISK: 37812000 - 37fef4f9

stevens at ubuntu-server:~$ uname -a
Linux ubuntu-server 2.6.28-11-server #37-Ubuntu SMP Mon Mar 23 17:33:24 UTC
2009 x86_64 GNU/Linux

stevens at ubuntu-server:~$ cat /proc/mtrr
reg00: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
reg01: base=0x000000000 (    0MB), size= 4096MB, count=1: write-back
reg02: base=0x100000000 ( 4096MB), size= 1024MB, count=1: write-back
reg03: base=0x0bff80000 ( 3071MB), size=  512KB, count=1: uncachable

Any ideas?

Best regards,

Morten