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From:   bugzilla-daemon@bugzilla.kernel.org
To:     linux-usb@vger.kernel.org
Subject: [Bug 206365] New: kernel NULL pointer dereference when charger is
 unplugged
Date:   Fri, 31 Jan 2020 08:22:53 +0000
X-Bugzilla-Reason: None
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org
X-Bugzilla-Product: Drivers
X-Bugzilla-Component: USB
X-Bugzilla-Version: 2.5
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: high
X-Bugzilla-Who: andrea.lagala@gmail.com
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org
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https://bugzilla.kernel.org/show_bug.cgi?id=206365

            Bug ID: 206365
           Summary: kernel NULL pointer dereference when charger is
                    unplugged
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.3.4-300.fc31.x86_64
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: andrea.lagala@gmail.com
        Regression: No

Created attachment 287039
  --> https://bugzilla.kernel.org/attachment.cgi?id=287039&action=edit
lshw output

Every time I unplug my charger, I get a oops about a NULL pointer dereference.
The computer then slows down to a crawl, up until it fully freezes. ABRT tries
to get a report, but never gets to write any data. I installed kdump and forced
the panic on oops setting to get as much data as possible. I initially thought
that tlp was the culprit; deactivating it yielded no improvements. Then,
reading dmesg while troubleshooting I noticed lockdown was blocking direct
writes to registers. I disabled Secure Boot but the problem still is there.

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