[Bug 208381] kernel panic at _mtx_lock_sleep: recursed on non-recursive mutex pmap @ /usr/src/sys/arm/arm/pmap-v6.c:1890

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208381

            Bug ID: 208381
           Summary: kernel panic at  _mtx_lock_sleep: recursed on
                    non-recursive mutex pmap @
                    /usr/src/sys/arm/arm/pmap-v6.c:1890
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: otacilio.neto at bsd.com.br

Created attachment 168752
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168752&action=edit
session log of many kernel panics.

I'm installing xfce on a beaglebone black running 

FreeBSD beaglebone 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r296898M: Wed Mar 16
23:52:02 BRT 2016    
ota at nostromo:/root/crochet/work/obj/arm.armv6/usr/src/sys/BEAGLEBONE-DEBUG  arm

FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
Target: armv6--freebsd11.0-gnueabi
Thread model: posix
InstalledDir: /usr/bin


All times I getting a kernel panic on /usr/src/sys/arm/arm/pmap-v6.c:1890



[51/87] Extracting libgsf-1.14.36:  40%panic: pmap_fault: pm_pt1 abort
KDB: enter: panic
dbg_check_slot_free: Invalid slot number 0, max -1
dbg_check_slot_free: Invalid slot number 1, max -1
[ thread pid 933 tid 100091 ]
Stopped at      $d.6:panic: _mtx_lock_sleep: recursed on non-recursive mutex
pmap @ /usr/src/sys/arm/arm/pmap-v6.c:1890

Attached is a session log of many sessions trying install xfce and triggering
the kernel panic.

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