arm-smmu-v3 arm-smmu-v3.3.auto: CMD_SYNC timeout
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
Undecided
|
dann frazier | ||
Cosmic |
Fix Released
|
Undecided
|
dann frazier |
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.
Changed in linux (Ubuntu Bionic): | |
status: | New → In Progress |
Changed in linux (Ubuntu Cosmic): | |
status: | New → In Progress |
description: | updated |
Changed in linux (Ubuntu Bionic): | |
assignee: | nobody → dann frazier (dannf) |
Changed in linux (Ubuntu Cosmic): | |
assignee: | nobody → dann frazier (dannf) |
Changed in linux (Ubuntu): | |
status: | Confirmed → Fix Committed |
assignee: | dann frazier (dannf) → nobody |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Cosmic): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu): | |
status: | Fix Committed → Fix Released |
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification- needed- cosmic' to 'verification- done-cosmic' . If the problem still exists, change the tag 'verification- needed- cosmic' to 'verification- failed- cosmic' .
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.
See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation how to enable and use -proposed. Thank you!