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Date:	Tue, 04 Nov 2008 10:23:58 +1100
From:	Shehjar Tikoo <>
Subject: Panic in multiple kernels: IA64 SBA IOMMU: Culprit commit on Mar
 28, 2008

Hi All

I've been observing kernel panics for the past week on
kernel versions 2.6.26, 2.6.27 but not on 2.6.24 and 2.6.25.

The panic message says:

arch/ia64/hp/common/sba_iommu.c: I/O MMU is out of mapping resources

Using git-bisect, I've zeroed in on the commit that introduced this.
Please see the attached file for the commit.

The workload consists of 2 tests:
1. Single fio process writing a 1 TB file.
2. 15 fio processes writing 15GB files each.

The panic happens on both workloads. There is no stack trace after
the above message.

Other info:
System is HP RX6600(16Gb RAM, 16 processors w/ dual cores and HT)
20 SATA disks under software RAID0 with 6 TB capacity.
Silicon Image 3124 controller.
File system is XFS.

I'd much appreciate some help in fixing this because this panic has
basically stalled my own work. I'd be willing to run more tests on my
setup to test any patches that possibly fix this issue.


View attachment "iommu-panic-culprit-commit.patch" of type "text/x-patch" (6794 bytes)

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