Re: random and persistant hard kernel lock, 10.10 (old and newer kernel) and 12.04 (l
Let me get this straight, from your observations I conclude the following:
- 2.6.35 works, no lockups
- above 2.6.35, lockups
A prime suspect in these lock-ups is the cpufreq driver which you just disabled in the BIOS. To narrow it down, disable cpufreq in the BIOS and boot a kernel that previously caused lock-ups.
Between 2.6.35 and 2.6.36 there were about 10 patches inside the cpufreq infrastructure and drivers.
Furthermore, I quote:
One more thing (in 10.10 only), I have a quad core and sometimes ill have a constant 25+% CPU use even tho sys monitor does not show the culprit of the use. It speads itself out over all of the cores, but will remain at 25-28% CPU use forever until I suspend or reboot. System doesnt seem any slower because of this, but happens frequently, randomly, and seems unrelated to predicting a kernel hang.
To me, this also points to some cpu problem. Especially since it's 'fixed' after a reboot/resume/thaw. Since the kernel reïnitialises the CPU and freshly applies cpufreq on top of it.
The fact that it seems unrelated doesn't mean it's relevant. It could be a race condition that occurs based on probability (which is also a bug btw).
So, for now (and I assume you already did that before you went fishing) is that you have booted a Linux OS with a kernel version above 2.6.35 and have CPU frequency scaling disabled in the kernel.
When you get back, check for both symptoms:
- ghost cpu usage 25%
- hard lock-up
Hope they bite!
linux-git/fs/super.c: "Self-destruct in 5 seconds. Have a nice day...\n",
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