Date: Sat, 18 May 2019 20:51:00 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 237590] powerpc64 PowerMac11,2 and 7,2 context, -r330614 and later (including -r345758): "ofwdump -ap" crashes the system; probable -r330610 "cause" Message-ID: <bug-237590-227-Bs6n2yKHS9@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-237590-227@https.bugs.freebsd.org/bugzilla/> References: <bug-237590-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237590 --- Comment #4 from Mark Millard <marklmi26-fbsd@yahoo.com> --- (In reply to Mark Millard from comment #3) Based on register values values it looks like the openfirmware code got something like, say, a Data Storage Exception, that in turn went to generictrap, that in turn went to k_trap: <k_trap> mfsprg r31,0 <k_trap+0x4> mfsrr0 r30 <k_trap+0x8> std r30,288(r31) <k_trap+0xc> mfsrr1 r30 <k_trap+0x10> std r30,296(r31) <k_trap+0x14> mfsprg r31,1 <k_trap+0x18> mfmsr r30 <k_trap+0x1c> ori r30,r30,50 <k_trap+0x20> mtmsr r30 <k_trap+0x24> isync <k_trap+0x28> stdu r31,-688(r1) It failed at the last because the value r1 held 0xffff'ffff'ffb7'f400, apparently an openfirmware stack address being handled by a FreeBSD exception handler under the FreeBSD memory management. (So far, I can not be sure of what, specifically, initiated getting to k_trap.) --=20 You are receiving this mail because: You are the assignee for the bug.=
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