[Bug 205932] [panic] Kernel panic when copying from ext2fs partition to UFS partition

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205932

            Bug ID: 205932
           Summary: [panic] Kernel panic when copying from ext2fs
                    partition to UFS partition
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: will_brokenbourgh at yahoo.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 165117
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=165117&action=edit
Verbose kernel panic textual information

When copying files from an ext4 partition on device ada1 mounted read-only to a
user's home directory on the FreeBSD root (UFS) partition on device ada0, a
kernel panic occurs after around 100 files are copied.

It appears at least one other person has experienced this recently:
http://freebsd.1045724.n5.nabble.com/Ext4-Kernel-Panic-td6025605.html

This kernel panic happens after a fresh install with NO packages or ports
installed yet and both before AND after performing system update with
freebsd-update.


COMMANDS ISSUED (under root account):
- - -
# mount -t ext2fs -o ro /dev/ada1p4 /mnt/adisk

# cd /mnt/adisk

# ls
lost+found will

# cp -Rnv will /home/will
(KP happens after about 100 files copied)
- - -


CRASH INFO:
- - -
Dump header from device /dev/ada0p3
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 714723328B (681 MB)
  Blocksize: 512
  Dumptime: Tue Jan  5 10:51:56 2016
  Hostname: will-freebsd
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 10.2-RELEASE #0 r286666: Wed Aug 12 15:26:37 UTC 2015
    root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
  Panic String: __lockmgr_args: recursing on non recursive lockmgr getblk @
(null):0

  Dump Parity: 3650188378
  Bounds: 1
  Dump Status: good
- - -

The more verbose crash text is attached.

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