Re: enabling kernel dump options in GENERIC

On Thu, May 17, 2018 at 08:58:16PM -0700, Mark Millard wrote:
> Mark Johnston markj at FreeBSD.org wrote on
> Thu May 17 17:24:19 UTC 2018 :
> 
> > Over the past couple of years, a number of kernel dump features have
> > been added: encryption, compression and dumping to a remote host
> > (netdump). These features are currently all omitted from GENERIC.
> > 
> > . . .
> > Therefore, I'd like to propose enabling these features by default
> > on i386, amd64, arm64, powerpc(64) and sparc64 so that they're available
> > out of the box in 12.0.
> > . . .
> 
> Bugzilla 214598 (from late 2016) was about
> dump for TARGET_ARCH=powerpc64 builds getting
> failures like:
> 
> KDB: enter: manual escape to debugger
> [ thread pid 12 tid 10018 ]
> Stopped at       .kdb_enter+0x70:       ori r0, r0, 0x0
> db> dump
> Dumping 9 MB (3 chunks)
>   chunk 0: 10MB (2510 pages) ... ok
>   chunk 1: 1MB (24 pages) ... ok
>   chunk 2: 1MB (2 pages)panic: vm_fault: fault on nofault entry, addr: c000000000022000
> 
> (A 32-bit powerpc build on the same machine worked
> fine for dumping.)
> 
> I just tried it with head -r333594 and I got something
> similar. (Old and new mention routines with _bus_dma_map_
> in the names near the trap in the call stack. I've not
> done a detailed comparison.)

What is the call stack?
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