Date: Tue, 9 Oct 2018 12:54:52 -0700 From: Mark Millard <marklmi@yahoo.com> To: Michael Tuexen <tuexen@fh-muenster.de>, Justin Hibbits <chmeeedalf@gmail.com> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: Failed attempt to boot a (non-debug) head -r339076 on an old PowerMac G5 "Quad Core" (built via devel/powerpc64-gcc): Waking up CPU 1 Message-ID: <C0FD8A95-A3DA-45FA-A59E-C7308EA95DFF@yahoo.com> In-Reply-To: <031407DB-57AD-4E09-9A22-A0D4A347576E@yahoo.com> References: <0E6DB192-37A3-45EC-87E9-C5AA1C9397AE@yahoo.com> <785D268A-2612-459F-BD1F-A650D9ECCA28@fh-muenster.de> <A62CE721-B12A-4A79-BC43-F4E0F412D695@yahoo.com> <A7E94F86-E160-4E58-8C44-99DE109D2758@fh-muenster.de> <3DCB6910-6F08-408A-B3D1-70A7EB5A55BC@yahoo.com> <037e3dd6-cc0c-a39f-f074-bce01887156c@blastwave.org> <20181008152746.1aba4221@ralga.knownspace> <AF5D435D-727A-4C8B-8E9C-749CDB1E2140@yahoo.com> <031407DB-57AD-4E09-9A22-A0D4A347576E@yahoo.com>
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On 2018-Oct-9, at 8:20 AM, Mark Millard <marklmi at yahoo.com> wrote: > [The stable/head mix seems to be a wrong idea: 11.2 gets past > the SMP: messages just fine on the so-called G5 "Quad Core".] > > On 2018-Oct-8, at 5:14 PM, Mark Millard <marklmi at yahoo.com> wrote: > >> On 2018-Oct-8, at 1:27 PM, Justin Hibbits <chmeeedalf at gmail.com> wrote: >> >>>> . . . >>> >>> It would be helpful to know the last known-good SVN revision, both for >>> Head and 11.x, as well as the oldest failing one. Since my G5 bit the >>> dust, I can't check locally. >> > . . . There are examples of head's kernels that sometimes fail to get to the "SMP:" messages and sometimes work for getting there (and beyond). So: My reporting any example failure is a solid indicator of the "does not reach "SMP:" problem in that build. (All tries reached the waking message on at least cpu 1.) My reporting "worked" for a revision might be a misclassification. (This makes for a messier "binary-like search".) That said, the summary of the later detail is: head -r334494 kernel worked head -r334528 kernel failed (There is nothing between those for: https://artifact.ci.freebsd.org/snapshot/head/r*/powerpc/powerpc64/kernel.txz so getting a smaller range requires builds. I've not attempted that.) The only machine-dependent powerpc64 change between those 2 that I see is: Author: jhibbits Date: Fri Jun 1 21:37:20 2018 New Revision: 334498 URL: https://svnweb.freebsd.org/changeset/base/334498 Log: Increase powerpc64 KVA from ~7.25GB to 32GB . . . More detail for the test sequence follows, if you care. Otherwise skip it. The following was complicated by the discovery that for some(?) kernels, a kernel that worked one time could in a later try fail. (It is almost like it is using some uninitialized RAM and getting varying behavior, possibly depending on unload->load sequences in the loader.) I noticed because of using unload and load after a failure to (try) boot a previously working kernel to set up the next test. Stated based on: head -r333594 kernel always has worked head -r339076 kernel failed Searching: head -r336706 kernel failed head -r335006 kernel sometimes worked, later: sometimes failed head -r335852 kernel sometimes worked, later: sometimes failed <various failed's not shown here, given the above 2 later "sometimes fails" discoveries> head -r334298 kernel worked head -r334644 kernel failed head -r334474 kernel worked head -r334554 kernel sometimes worked, later: sometimes failed head -r334594 kernel failed head -r334494 kernel worked head -r334528 kernel failed If 334494 ever fails, explore: 334474 (repeated to check: keeps working?) 334484 (the only archived powerpc64 build between 338474 and 338494) === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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