linux-kernel - unchecked MSR access error in throttle_active

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Message-ID: <20191128085447.GA3682@owl.dominikbrodowski.net>
Date:   Thu, 28 Nov 2019 09:54:47 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: unchecked MSR access error in throttle_active_work()

On most recent mainline kernels (such as 5.5-rc0 up to a6ed68d6468b), I see
the following output in dmesg during startup:

[   78.016676] unchecked MSR access error: WRMSR to 0x19c (tried to write 0x00000000880f3a80) at rIP: 0xffffffff84ab5742 (throttle_active_work+0xf2/0x230)
[   78.016686] Call Trace:
[   78.016694]  process_one_work+0x247/0x590
[   78.016703]  worker_thread+0x50/0x3b0
[   78.016710]  kthread+0x10a/0x140
[   78.016715]  ? process_one_work+0x590/0x590
[   78.016735]  ? kthread_park+0x90/0x90
[   78.016740]  ret_from_fork+0x3a/0x50

Any clues?

Thanks,
	Dominik