** Changed in: linux-azure (Ubuntu)
Assignee: (unassigned) => Marcelo Cerri (mhcerri)
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https://bugs.launchpad.net/bugs/2062977
Title:
Please backport d02c357e5bfa7dfd618b7b3015624beb71f58f1f
Status in linux-azure package in Ubuntu:
New
Bug description:
We've been starting to run the systemd integration tests on Github
Actions, and noticed a soft lockup in of our VMs:
"""
[ 245.130625] INFO: task khugepaged:38 blocked for more than 122 seconds.
[ 245.131669] Not tainted 6.8.7-arch1-1 #1
[ 245.132371] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 245.134651] INFO: task test-journal-ve:4563 blocked for more than 122
seconds.
[ 245.136035] Not tainted 6.8.7-arch1-1 #1
[ 245.136921] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 253.516332] systemd[1]: Unmounting efi.mount...
[ 253.535696] systemd[1]: efi.mount: Deactivated successfully.
[ 253.537261] systemd[1]: Unmounted efi.mount.
[ 345.502294] systemd[1006]: Created slice background.slice.
[ 345.504159] systemd[1006]: Starting systemd-tmpfiles-clean.service...
[ 345.537927] systemd[1006]: Finished systemd-tmpfiles-clean.service.
[ 368.017373] INFO: task khugepaged:38 blocked for more than 245 seconds.
[ 368.019120] Not tainted 6.8.7-arch1-1 #1
[ 368.020219] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 368.021719] INFO: task test-journal-ve:4563 blocked for more than 245
seconds.
[ 368.023485] Not tainted 6.8.7-arch1-1 #1
[ 368.024593] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 490.891682] INFO: task khugepaged:38 blocked for more than 368 seconds.
[ 490.893456] Not tainted 6.8.7-arch1-1 #1
[ 490.894594] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 490.896750] INFO: task test-journal-ve:4563 blocked for more than 368
seconds.
[ 490.897930] Not tainted 6.8.7-arch1-1 #1
[ 490.898880] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
"""
This is the same lockup as was already investigated in
https://github.com/systemd/systemd-centos-ci/issues/720 and was traced
to a missing backported commit in the *host* kernel, specifically
d02c357e5bfa7dfd618b7b3015624beb71f58f1f (KVM: x86/mmu: Retry fault
before acquiring mmu_lock if mapping is changing). See the linked
issue for all the details.
Can this commit please be backported to linux-azure to fix these soft
lockups in VMs running on Github Actions?
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