Hi Rafael, dear community
One of our customers reported seeing freezes when running the LTS Linux
kernel 4.9.x on our Toradex Colibri T20 modules [1]. I was able to
reproduce a complete SoC lock-up after a few minutes also running the
latest 4.14-rc7 while LTS 4.4.x seemed to run stable.
Having attempted a multi-level bisection points towards the following
first bad commit:
9c4b2867ed7c8c8784dd417ffd16e705e81eb145
cpuidle: menu: Fix menu_select() for CPUIDLE_DRIVER_STATE_START == 0
Unfortunately as drivers/cpuidle/governors/menu.c has gotten further
edits since it seems not trivial to just revert it.
However I found out that it indeed has to do with CPU idle as when I
did disable the CONFIG_CPU_IDLE Linux kernel configuration option also
LTS 4.9.59 as well as latest 4.14-rc7 run now stable overnight.
Does anybody have any clue what exactly may be happening and/or why
cpuidle may not run stable on T20? Or is everybody always just
disabling cpuidle on T20 anyway?
Thanks!
[1] https://www.toradex.com/community/questions/16838/actual-lts-kernel
-49-on-colibri-t20.html
Best regards - Mit freundlichen Grüssen - Meilleures salutations
Marcel Ziswiler
Platform Manager Embedded Linux
Toradex AG
Altsagenstrasse 5 | 6048 Horw/Luzern | Switzerland | T: +41 41 500 48 00
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