DSI when in dhclient

[Alexey Dokuchaev]

On Sun, May 11, 2014 at 05:50:07PM -0700, Justin Hibbits wrote:
> Something odd I've been running into lately on 32-bit powerpc, when I
> run dhclient on an interface, I get a Data Storage Interrupt dropping
> me to ddb.  It happens when dhclient is spawning /usr/sbin/arp, and I
> don't know why.  I can write directly to the page it's trying to write
> into. [...] Does anyone else see this?

I sometimes get dropped to ddb(4) due to DSI on Mac mini G4 but unrelated
to dhclient(8); however, I have a question about kernel debugging, so I'd
chime in. :)

While at db> prompt, I can see the backtrace and even "call doadump" to
save some 37MB of memory.  On subsequent reboot, usual set of files under
/var/crash is generated, but running kgdb(1) on them for postmortem shows
nothing except couple of question marks.

Is crashdump saving/reading is broken on PowerPC these days, or I'm just
doing it wrongly?

./danfe