With some debugging I found, that cpufreqd crashes within the plugin
cpufreqd_acpi.so. The function acpi_battery_update tries to read battery
information in sysfs (/sys directory) with libsysfs functions. Because
of an invalid pointer cpufreqd crashes here.

I could work around this bug with renaming the cpufreqd_acpi.so plugin.
Unfortunately the functions of this plugin are essential. Without this
plugin cpufreqd cannot read battery status and other important
information.

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https://bugs.launchpad.net/bugs/733507

Title:
  cpufreqd assert failure: *** glibc detected *** /usr/sbin/cpufreqd:
  free(): invalid pointer: 0x09067b10 ***

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