linux-kernel - PROBLEM: acpi hangs in uninterruptible sleep on 5.4.0-rc1

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Message-ID: <20191005064913.GA27490@D-69-91-141-110.dhcp4.washington.edu>
Date:   Sat, 5 Oct 2019 02:49:13 -0400
From:   Stuart Little <achirvasub@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: PROBLEM: acpi hangs in uninterruptible sleep on 5.4.0-rc1 

I am on an Intel(R) Core(TM)2 Duo CPU T5450  @ 1.66GHz, currently running kernel 5.4.0-rc1 custom-compiled with the attached config on i686 Debian 10.1.

This has happened twice: with no pre-warning, issuing the command 'acpi -t' simply hangs the respective terminal. htop indicates process status 'D', i.e. uninterruptible sleep. The only solution has been to reboot.

I am attaching my dmesg. You can see a number of call traces at the end.

I do not know what triggers this and can't reproduce it at will, so it might be hard to test. The first time it happened after about 2 days' uptime, the second time around after about 1 day and 15h. 

View attachment "config-5.4.0-rc1-deb32" of type "text/plain" (148280 bytes)

View attachment "dmesg" of type "text/plain" (67126 bytes)