"intel_iommu=on iommu=on,pt" causes hangs on HP DL380 G7
Issue
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This same config, with VT-d enabled in the BIOS, works fine and doesn't hang when run under RHEL6.
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Under RHEL5, the hang occurs when udev starts and is sometimes accompanied by an error message:
Starting udev: Uhhuh. NMI received for unknown reason f1.
You probably have a hardware problem with your RAM chips
Dazed and confused, but trying to continue
- That's what we get with 2.6.18-238.21.1.el5, but with newer RHEL5 kernels (2.6.18-308.1.1.el5), the system freezes much earlier, during cciss initialization:
cciss 0000:05:00.0: cciss: Trying to put board into performant mode
cciss 0000:05:00.0: Placing controller into performant mode
32bit 0000:05:00.0 uses non-identity mapping
64bit 0000:05:00.0 uses identity mapping
(...hang...)
Environment
- Red Hat Enterprise Linux 5.8
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