** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
** Description changed:
[Impact]
During heavy load, the following message may appear on the console of a
HiSilicon D06 system:
arm-smmu-v3 arm-smmu-v3.3.auto: CMD_SYNC timeout
This is due to a bug that can also impact system performance, as the CPU
is blocked until the timeout occurs.
[Test Case]
The Ubuntu server certification test suite hits this pretty reliably during
the stress-ng tests, although I haven't narrowed it down to exactly which test
yet.
+ [Fix]
+ 0f02477d16980 iommu/arm-smmu-v3: Fix unexpected CMD_SYNC timeout
+
[Regression Risk]
Limited to arm64 systems. This change has been upstream since 4.20 w/o any
noticed regressions (based on lack of Fixes: commits). Regressions could
manifest as a performance hit.
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu)
Assignee: dann frazier (dannf) => (unassigned)
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https://bugs.launchpad.net/bugs/1818162
Title:
arm-smmu-v3 arm-smmu-v3.3.auto: CMD_SYNC timeout
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Bug description:
[Impact]
During heavy load, the following message may appear on the console of a
HiSilicon D06 system:
arm-smmu-v3 arm-smmu-v3.3.auto: CMD_SYNC timeout
This is due to a bug that can also impact system performance, as the
CPU is blocked until the timeout occurs.
[Test Case]
The Ubuntu server certification test suite hits this pretty reliably during
the stress-ng tests, although I haven't narrowed it down to exactly which test
yet.
[Fix]
0f02477d16980 iommu/arm-smmu-v3: Fix unexpected CMD_SYNC timeout
[Regression Risk]
Limited to arm64 systems. This change has been upstream since 4.20 w/o any
noticed regressions (based on lack of Fixes: commits). Regressions could
manifest as a performance hit.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1818162/+subscriptions
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