[Bug 235162] [panic] avl_find() succeeded inside avl_add() during zpool -> zpool migration

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235162

            Bug ID: 235162
           Summary: [panic] avl_find() succeeded inside avl_add() during
                    zpool -> zpool migration
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dch at freebsd.org

Dump header from device: /dev/gpt/swap
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 14036127744
  Blocksize: 512
  Compression: none
  Dumptime: Wed Jan 23 18:36:11 2019
  Hostname: wintermute.skunkwerks.at
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 12.0-RELEASE r341666 GENERIC
  Panic String: avl_find() succeeded inside avl_add()
  Dump Parity: 1555455779
  Bounds: 1
  Dump Status: good

Backtrace:
Reading symbols from /boot/kernel/kernel...(no debugging symbols found)...done.
0xffffffff80bcd0bd in sched_switch ()
(kgdb) #0  0xffffffff80bcd0bd in sched_switch ()
#1  0x0000000000000007 in ?? ()
#2  0xfffffe0153d766d0 in ?? ()
#3  0xffffffff80bcbc0a in cpu_search_lowest ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(kgdb) 

I also have a vmcore.1 to go with it if these are of use.

System was doing just a big zfs transfer, using ~ 100GiB RAM and ~ 2/3 of all
CPU.

  zfs send -LDevcR embiggen at repl | zfs recv -Fuvs zroot

about ~ 300MB/s transfer from 1 zfs pool to another local zfs pool, roughly
transferred ~2.18TB of 2.25T planned, so very close to end of it :-(

4 datasets out of 85 missing, I was afk drinking coffee.

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