Date: Fri, 18 May 2018 06:14:50 -0700 From: Mark Millard <marklmi26-fbsd@yahoo.com> To: Mark Johnston <markj@FreeBSD.org> Cc: freebsd-arch@freebsd.org, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: enabling kernel dump options in GENERIC Message-ID: <F296C61B-467E-48A8-8207-227CE38CF762@yahoo.com> In-Reply-To: <20180518061739.GC5515@raichu> References: <A133EC52-A05A-49DE-8FCB-63D949CC9A94@yahoo.com> <20180518061739.GC5515@raichu>
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On 2018-May-17, at 11:17 PM, Mark Johnston <markj at FreeBSD.org> wrote: > 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 : >>=20 >>> 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. >>>=20 >>> . . . >>> 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. >>> . . . >>=20 >> Bugzilla 214598 (from late 2016) was about >> dump for TARGET_ARCH=3Dpowerpc64 builds getting >> failures like: >>=20 >> 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 >>=20 >> (A 32-bit powerpc build on the same machine worked >> fine for dumping.) >>=20 >> 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.) >=20 > What is the call stack? I'll have to induce the failure, take a picture of the screen that results, and hand type in the material for the fairly modern backtrace (-r333594). I will not be able to do this until later today. The bugzilla report has the old backtrace. I did not quote all the material from that report in the above. So there is something to compare against once I supply a modern one. Also: in about a week I'll lose access to the PowerMacs for an unknown period of time (weeks? months?). =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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