The problem was fixed by the following commit, present in all Ubuntu
releases: 625d7d351887 ("scsi: hpsa: correct ioaccel2 chaining").
Basically it was an access to a DMA non-mapped region, and was
restricted to non-RAID mode adapters due to the I/O path being
different.
Since it was fixed, no more work or debug is necessary here.
Cheers,
Guilherme
** Changed in: linux (Ubuntu Disco)
Status: Confirmed => Fix Released
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1813651
Title:
hpsa: DMAR invalid read
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Disco:
Fix Released
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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