Bug 81121 - WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.13.0/drivers/iommu/dmar.c:488 warn_invalid_dmar+0x7e/0x90()
Summary: WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.13.0/drivers/iommu/dmar.c:488...
Status: RESOLVED WILL_NOT_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_other
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-07-26 00:54 UTC by Cristian Aravena Romero
Modified: 2014-08-21 19:13 UTC (History)
1 user (show)

See Also:
Kernel Version: 3.13.11.4
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg 3.13.11.4 (72.52 KB, text/x-log)
2014-07-26 00:54 UTC, Cristian Aravena Romero 		Details
lspci -vvnn (12.14 KB, text/plain)
2014-07-26 00:55 UTC, Cristian Aravena Romero 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Cristian Aravena Romero 2014-07-26 00:54:35 UTC 
Created attachment 144251 [details]
dmesg 3.13.11.4

[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.13.0/drivers/iommu/dmar.c:488 warn_invalid_dmar+0x7e/0x90()
[    0.000000] Your BIOS is broken; DMAR reported at address 0!
[    0.000000] BIOS vendor: Insyde; Ver: F.24; Product Version: 0882100000305E00000610100
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.13.0-32-generic #57-Ubuntu
[    0.000000] Hardware name: Hewlett-Packard HP Pavilion 14 Notebook PC/2165, BIOS F.24 02/13/2014
[    0.000000]  000000000000000b ffffffff81c01de8 ffffffff8171bcb4 ffffffff81c01e30
[    0.000000]  ffffffff81c01e20 ffffffff810676cd ffffffff81fde008 ffffffff81fde048
[    0.000000]  0000000000000000 ffffffff81de12c0 ffffffff81c01fb0 ffffffff81c01e80
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff8171bcb4>] dump_stack+0x45/0x56
[    0.000000]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
[    0.000000]  [<ffffffff81067784>] warn_slowpath_fmt_taint+0x44/0x50
[    0.000000]  [<ffffffff81d502c4>] ? early_ioremap+0x13/0x15
[    0.000000]  [<ffffffff81d45ee6>] ? __acpi_map_table+0x13/0x18
[    0.000000]  [<ffffffff815f2bae>] warn_invalid_dmar+0x7e/0x90
[    0.000000]  [<ffffffff81d8ab6e>] check_zero_address+0x68/0xf4
[    0.000000]  [<ffffffff81d8ac0f>] detect_intel_iommu+0x15/0xae
[    0.000000]  [<ffffffff81d3ffb5>] pci_iommu_alloc+0x4a/0x6c
[    0.000000]  [<ffffffff81d4fc61>] mem_init+0x17/0x9c
[    0.000000]  [<ffffffff81d35d3a>] start_kernel+0x202/0x443
[    0.000000]  [<ffffffff81d35941>] ? repair_env_string+0x5c/0x5c
[    0.000000]  [<ffffffff81d35120>] ? early_idt_handlers+0x120/0x120
[    0.000000]  [<ffffffff81d355ee>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff81d35733>] x86_64_start_kernel+0x143/0x152
[    0.000000] ---[ end trace 488581fbeae80768 ]---
Comment 1 Cristian Aravena Romero 2014-07-26 00:55:08 UTC 
Created attachment 144261 [details]
lspci -vvnn
Comment 2 Cristian Aravena Romero 2014-07-26 00:58:28 UTC 
https://bugs.launchpad.net/linux/+bug/1348858
Comment 3 Alan 2014-07-29 15:10:37 UTC 
"Your BIOS is broken; DMAR reported at address 0!"

as far as I can see this is not a Linux bug. 

You may find enabling the IOMMU in the BIOS makes the BIOS report something sensible
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