On 03.11.2017 16:07, Marcel Ziswiler wrote: > 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 I haven't seen any problems with the cpuidle on next and 4.14-rc7 works fine. # cat /sys/devices/system/cpu/cpu[0-1]/cpuidle/state[0-1]/usage 162283 32905 254669 32905 # cat /sys/devices/system/cpu/cpu[0-1]/cpuidle/state[0-1]/time 436981763 2110484666 458260707 2121781516 # uptime 18:50:24 up 44 min, 1 user, load average: 0.15, 0.08, 0.07 It could be that cpuidle unmasks some other issue on the Colibri. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
