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 (main line) | Direct: +41 41 500 48 10��.n��������+%������w��{.n�����{��נ���^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
