[Bug 1813651] Re: hpsa: DMAR invalid read

** Also affects: linux (Ubuntu Disco)
Importance: Medium
Assignee: Guilherme G. Piccoli (gpiccoli)
Status: Confirmed

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https://bugs.launchpad.net/bugs/1813651

Title:
hpsa: DMAR invalid read

Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Disco:
Confirmed

Bug description:
Recently in kernel 4.20-rc1 and newer we observed the following
spontaneous issue with hpsa when intel_iommu is enabled:

[ 5173.952022] DMAR: DRHD: handling fault status reg 2
[ 5174.190649] DMAR: [DMA Read] Request device [03:00.0] fault addr eefdd000 [fault reason 06] PTE Read access is not set

There's a commit that touches DMA in hpsa: "scsi: hpsa: switch to generic DMA API"
We've tested with this commit reverted on top of 4.20-rc1 and it reproduces (the trigger is a kernel build). We cannot reproduce in 4.19.

Investigation is ongoing.

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