[Bug 239822] deadlock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239822

            Bug ID: 239822
           Summary: deadlock
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: d8zNeCFG at aon.at

Scenario:
- FreeBSD releng/12.0 updated via SVN
- recompiled (using -DNO_CLEAN) after FreeBSD-EN-19:14.epoch
- Running on 3 machines
- I have not recompiled the following ports with files in /boot/modules:
  . Machine 1: intel-em-kmod-7.7.5, nvidia-driver-390.87_3,
virtualbox-ose-kmod-5.2.32_1
  . Machine 2: drm-fbsd12.0-kmod-4.16.g20190722_1, gpu-firmware-kmod-g20190620,
virtualbox-ose-kmod-5.2.32_1
- uname -a: FreeBSD hal.xyzzy 12.0-RELEASE-p9 FreeBSD 12.0-RELEASE-p9 #9
r350677M: Wed Aug  7 18:35:55 CEST 2019    
root at v908.xyzzy:/.../hal/z/OBJ/FreeBSD/amd64/releng/12.0/amd64.amd64/sys/XYZZY_SMP
 amd64

Result:
- On two of the three machines I have now experienced something which seems
like a livelock: Some processes are stuck, others still progress and can be
terminated (e.g., EOF in shells).
- Rebooting the machines never succeeds completely: At some point there is no
progress anymore and the machines have to be hard reset.
- In the first livelock, two tabs of Firefox seemed to be "stuck" against each
other; 100% CPU was used (1 out of 4 cores).
- In the second livelock, VirtualBox (VBoxHeadless) was spinning at 100% (1 out
of 4 cores), and a running svn command was stuck.

I have the impression that this started with -p9. Before, I mostly got panics
with immediate reboots (no kernel dumps although configured; see bug report
#235865).

-- Martin

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