Bug#869658: linux: system freezes when dell-smm-hwmon reads fan speed

From	Carmelo C <carmelo.debian@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#869658: linux: system freezes when dell-smm-hwmon reads fan speed
Date	2017-08-09 15:40 +0200
Message-ID	<ucznj-7Gt-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: linux-image-4.9.0-3-686-pae
Version: 4.9.30-2+deb9u3
Severity: important
Justification: linux: Debian system freezes when dell-smm-hwmon reads fan
speed

I runned the following commands, and attach their outputs:

strace -o strace_hwmon_fan1_output.txt -tt cat
/sys/class/hwmon/hwmon2/fan1_input

strace -o strace_hwmon_fan2_output.txt -tt cat
/sys/class/hwmon/hwmon2/fan2_input

strace -o strace_hwmon_fan3_output.txt -tt cat
/sys/class/hwmon/hwmon2/fan3_input

The execution times of these commands are:

fan1: 1,931609 seconds
fan2: 1,925555 seconds
fan3: 1,930267 seconds

In these intervals, the temporary freeze of the Debian operating system
occurs

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Bug#869658: linux: system freezes when dell-smm-hwmon reads fan speed Carmelo C <carmelo.debian@gmail.com> - 2017-08-09 15:40 +0200

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