[Bug 220472] 11.1-RC1 kernel panic (zfs recv)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220472

--- Comment #2 from John Kennedy <warlock at phouka.net> ---
I've been extremely frustrated trying to get a kernel dump for this panic.

Currently:
FreeBSD jormungandr.phouka.net 11.1-RC1 FreeBSD 11.1-RC1 #79
r313908+8df37be70f94(releng/11.1): Thu Jul  6 18:20:07 PDT 2017    
warlock at jormungandr.phouka.net:/usr/obj/usr/src/sys/GENERIC  amd64

>From rc.conf:
dumpdev="/dev/ada0p1"
dumpdir="/var/crash"
savecore_enable="YES"

# dumpon -l
ada0p1

# savecore -Cv
unable to open bounds file, using 0
checking for kernel dump on device /dev/ada0p1
mediasize = 35433480192 bytes
sectorsize = 512 bytes
magic mismatch on last dump header on /dev/ada0p1
No dump exists

I've got a pair of ZFS-mirroed Samsung SSD 960 EVO 250GB drives (/dev/nvd[01])
M.2 drives as zroot.  It didn't seem like dumpon liked the encrypted swap
partitions on there (even with "late" option), so I threw in a extra drive and
created a unencrypted swap partition on it with enough space for all the
memory, just in case.

# gpart show /dev/nvd0
=>       40  488397088  nvd0  GPT  (233G)
         40       1024     1  freebsd-boot  (512K)
       1064        984        - free -  (492K)
       2048    4194304     2  freebsd-swap  (2.0G)
    4196352  484200448     3  freebsd-zfs  (231G)
  488396800        328        - free -  (164K)

# gpart show /dev/ada0
=>       40  937703008  ada0  GPT  (447G)
         40       4056        - free -  (2.0M)
       4096   69206016     1  freebsd-swap  (33G)
   69210112  868492936        - free -  (414G)

# grep ' memory ' /var/log/dmesg.today 
real memory  = 34359738368 (32768 MB)
avail memory = 33191440384 (31653 MB)

Nothing is saved to /var/crash.  It exists, only contains "minfree" (with the
contents of "2048").  Booting to single user after panic and running savecore
by hand doesn't seem to find anything, either.

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