** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1744163
Title:
CPU offlining can trigger hangs with HP ProLiant DL360p Gen8.
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Artful:
Triaged
Status in linux source package in Bionic:
Triaged
Bug description:
CPU offlining can trigger hangs with HP ProLiant DL360p Gen8 on Ubuntu
17.10.
The hangs also occur with latest mainline kernel Linux 4.15-rc8.
I bisected the upstream mainline kernel. This is a regression
introduced by Linux 4.13-rc1 commit
c5cb83bb337c25caae995d992d1cdf9b317f83de ("genirq/cpuhotplug: Handle
managed IRQs on CPU hotplug").
https://github.com/torvalds/linux/commit/c5cb83bb337c25caae995d992d1cdf9b317f83de
This test case to offline all CPUs except for CPU 0 can be used to
trigger a hang.
for i in $(seq 1 $(expr $(nproc --all) - 1)); do sudo sh -c "echo 0 >
/sys/devices/system/cpu/cpu$i/online"; done
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