** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1765232
Title:
Kernel 4.15.0-15 breaks Dell PowerEdge 12th Gen servers
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
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.
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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.
https://imgur.com/VT9zd0w
https://imgur.com/4BQPCXo
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