Date: Sun, 28 Sep 2014 03:13:53 -0700 From: Mark Millard <markmi@dsl-only.net> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: 10.1-BETA2 PowerMac G5 panic dump failure: "- oversized DMA transfer attempt 65536 > 32768" Message-ID: <0C5799BD-90B3-4BC2-9BC5-C8531401ED8D@dsl-only.net>
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I induced a panic dump attempt well after booting but it reported: Dumping 606MB (160 chunks) Chunk 0: 574592 bytes ata2: failure - oversized DMA transfer attempt 65536 > 32768 ... So it would appear that by default I can not get dumps for panics, at = least not on the PowerMac G5 configurations. (I'd guess that the = PowerMac G4's would be similar.) Everything else has been working for = the SSD use (the only media in place at the time --or normally). Context: FreeBSD FBSDG5M1 10.1-BETA2 FreeBSD 10.1-BETA2 #22 r271944M: Sun Sep 28 = 00:29:03 PDT 2014 root@FBSDG5M1:/usr/obj/usr/src/sys/GENERIC64 = powerpc GENERIC64 with options DDB and GDB added. WITH_DEBUG_FILES=3D = WITHOUT_CLANG=3D WITH_DEBUG=3D in /etc/make.conf. Odd DDB hack (internal = automatic script definition) for boot time reporting of information to = expose what is going on for a PowerMac G5 boot crash that happens fairly = frequently --reporting despite no input working at that early stage. = Also added a call to report a kernel backtrace at during the first = OF_<?> after the mmu is configured, before the actual ofwcall (which may = crash). The panic here was long after booting and logging in and it is from my = using Control-option-esc to get into DDB interactively (for the first = time) and my experimenting there. I'm not worried about the specific = panic at this point. But that dumps will fail is not so good. (It would = have been my first kernel dump.) Also possibly odd is that the only media is an SSD listed as ada0 with = partitions/slices listed as various ada0s<?>. Yet the dump failure = messages referred to ata2. There is no /dev/ata2 present. The swap = partition was on ada0s9 that it should have used for the dump. =3D=3D=3D Mark Millard markmi at dsl-only.net
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