Kernel 4.15.0-15 breaks Dell PowerEdge 12th Gen servers
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| linux (Ubuntu) |
Fix Released
|
Critical
|
Seth Forshee | ||
| Bionic |
Fix Released
|
Critical
|
Seth Forshee | ||
Bug Description
SRU Justification
Impact: Since 4.15.0-15 some machines have been failing to boot due to IO hangs. This is caused by patches applied for LP #1759723, which assigned managed interrupt vectors and reply queues for all possible CPUs, not just present CPUs. Some drivers were not prepared to cope with this and end up selecting reply queues not mapped to an online CPU, causing IO hangs during boot.
Fix: There are driver fixes available upstream, but there are 8-ish patches in total and we're extremely close to release, so the safer bet it to just revert the patches for LP #1759723. We can consider reintroducing them with required fixes at a later time.
Regression Potential: This is obviously going to reintroduce the problem the patches were intended to fix. These are less serious than the problems which the patches introduced, and IBM has given their okay to revert them as well.
Test Case: Verified to fix affected hardware on LP #1765232.
---
For Ubuntu 18.04 amd64 server, I updated the kernel from 4.15.0-13 to 4.15.0-15. The system hangs at boot up now. Rolling back to the old kernel everything works as expected. It appears to hang while trying to enumerate an SD card device, which isn't even installed. I have tried this on a Dell R620 and R820 and both have the exact same problem. I even downloaded a new installer iso from the daily builds to reinstall the OS and the installer hangs too now.
Support for Dell PowerEdge 12th gen servers appears to be broken with kernel 4.15.0-15.
| Nikolas Britton (nbritton) wrote | #1 |
| Ubuntu Foundations Team Bug Bot (crichton) wrote | #2 |
| tags: | added: bot-comment |
| affects: | ubuntu → linux (Ubuntu) |
| Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote Missing required logs. | #3 |
| Changed in linux (Ubuntu): | |
| status: | New → Incomplete |
| Tyler Doherty (tylerjd) wrote | #4 |
| tags: | added: bionic |
| Nikolas Britton (nbritton) wrote | #5 |
| Changed in linux (Ubuntu): | |
| status: | Incomplete → Confirmed |
| Joseph Salisbury (jsalisbury) wrote | #6 |
| Changed in linux (Ubuntu): | |
| importance: | Undecided → High |
| Changed in linux (Ubuntu Bionic): | |
| importance: | High → Critical |
| tags: | added: kernel-key |
| Joseph Salisbury (jsalisbury) wrote | #7 |
| Nikolas Britton (nbritton) wrote | #8 |
| Joseph Salisbury (jsalisbury) wrote | #9 |
| Seth Forshee (sforshee) wrote | #10 |
| Seth Forshee (sforshee) wrote | #11 |
| Seth Forshee (sforshee) wrote | #12 |
| Seth Forshee (sforshee) wrote | #13 |
| Tyler Doherty (tylerjd) wrote | #14 |
| Seth Forshee (sforshee) wrote | #15 |
| Tyler Doherty (tylerjd) wrote | #16 |
| Seth Forshee (sforshee) wrote | #17 |
| Nikolas Britton (nbritton) wrote | #18 |
| description: | updated |
| Changed in linux (Ubuntu Bionic): | |
| assignee: | nobody → Seth Forshee (sforshee) |
| status: | Confirmed → In Progress |
| Changed in linux (Ubuntu Bionic): | |
| status: | In Progress → Fix Committed |
| Launchpad Janitor (janitor) wrote | #19 |
| Changed in linux (Ubuntu Bionic): | |
| status: | Fix Committed → Fix Released |
| Nikolas Britton (nbritton) wrote | #20 |
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