[Bug 227352] 12-CURRENT (armv6) hangs on shutdown, often leaves file system not sync'd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227352

            Bug ID: 227352
           Summary: 12-CURRENT (armv6) hangs on shutdown, often leaves
                    file system not sync'd
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: bobf at mrp3.com

using FreeBSD-12.0-CURRENT-arm-armv6-RPI-B-20180329-r331740.img with serial
console enabled

observed shutdown in serial console, and it hung at this point:

Syncing disks, vnodes remaining... 0 timed out

after powering off [obviously hung] and fsck'ing the SD card, the following
problem was noted:

CANNOT READ BLK: 7693632

In a previous shutdown attempt, it did something similar, and I corrected the
problems with fsck by booting to single-user mode, mostly unreferenced file
pointers.

With the image in the state described above, I booted into single user, did
'fsck -y /' and had to repeat it because of a lot of unreferenced file
pointers.  I did 'sync' followed by another 'poweroff' [from the serial
console] and observed the following:

"Syncing disks, vnodes remaining... 0 4 timed out"

booted single user again, did 'fsck -y /' twice (as required, since the first
time didn't correct all of the problems), then did 'sync' followed by
'poweroff' and got the following:

"Syncing disks, vnodes remaining... 0 0 0 0 0 0 0 0 done"

and then the system hung.

booted single user again, ran fsck - no problems with the file system.



uname output:
FreeBSD pi1c 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r331740: Thu Mar 29 23:19:27
UTC 2018     root at releng3.nyi.freebsd.org:/usr/obj/usr/src/arm.armv6/sys/RPI-B 
arm

dmesg output (first part)

KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2018 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 12.0-CURRENT #0 r331740: Thu Mar 29 23:19:27 UTC 2018
    root at releng3.nyi.freebsd.org:/usr/obj/usr/src/arm.armv6/sys/RPI-B arm
FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM
6.0.0)
WARNING: WITNESS option enabled, expect reduced performance.
VT: init without driver.
CPU: ARM ARM1176 r0p7 (ECO: 0x00000000)
CPU Features: 
  Thumb, Security, VMSAv7
Optional instructions: 
  UMULL, SMULL, MLA, SIMD(ext)
  16KB/32B 4-way instruction cache
  16KB/32B 4-way WB data cache
real memory  = 469757952 (447 MB)
avail memory = 444567552 (423 MB)


I'll add more to this as I find it or on request

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