linux-kernel - Bug: d0e936adbd22 crashes at boot

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Message-ID: <942f4041-e4e7-1b08-3301-008ab37ff5b8@kernel.dk>
Date:   Fri, 3 Sep 2021 07:36:27 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>, inux-pm@...r.kernel.org
Subject: Bug: d0e936adbd22 crashes at boot

Hi,

Booting Linus's tree causes a crash on my laptop, an x1 gen9. This was a bit
difficult to pin down as it crashes before the display is up, but I managed
to narrow it down to:

commit d0e936adbd2250cb03f2e840c6651d18edc22ace
Author: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Date:   Thu Aug 19 19:40:06 2021 -0700

    cpufreq: intel_pstate: Process HWP Guaranteed change notification

which crashes with a NULL pointer deref in notify_hwp_interrupt() ->
queue_delayed_work_on().

Reverting this change makes the laptop boot fine again.

-- 
Jens Axboe