Public bug reported:
[Impact]
The scanning code for /proc/interrupts has an issue whereby, if the
system doesn't contain a pci bus, all other interrupts are skipped in
their addition to the irq database. This means nothing gets balanced,
and we constantly just rescan. This also causes constant spam appearing
in the device's syslog.
[Test Case]
* Flash a Raspberry Pi 3 device with the current beta image [1].
* Boot it up and notice the irqbalance spam in the syslog
* Update irqbalance from -proposed and reboot
* Confirm no additional irqbalance spam appears in syslog
Please note that we do not intend to build raspi3 images for cosmic so
validation of this bug on this platform cannot be performed. A sanity-
check of the binaries needs to be sufficient for verification.
[Regression Potential]
Fix comes from upstream's 1.5 version so it have a relatively small
regression potential (already in Debian and disco). But possible
regressions can appear in the irq classification code, with interrupts
not getting scanned.
** Affects: irqbalance (Ubuntu)
Importance: Medium
Assignee: Dave Jones (waveform)
Status: Fix Released
** Affects: irqbalance (Ubuntu Bionic)
Importance: Medium
Status: New
** Affects: irqbalance (Ubuntu Cosmic)
Importance: Low
Status: New
** Also affects: irqbalance (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: irqbalance (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: irqbalance (Ubuntu)
Status: In Progress => Fix Released
** Changed in: irqbalance (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: irqbalance (Ubuntu Cosmic)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1811655
Title:
Tons of spam in syslog from irqbalance on the raspi3
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