Date: Sun, 12 Dec 2010 18:51:53 -0600 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Justin Hibbits <chmeeedalf@gmail.com> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: Kernel panic in moea_pvo_to_pte Message-ID: <4D056E29.5040404@freebsd.org> In-Reply-To: <7AF92FAC-CE4B-46B4-ACB8-8B9022FEF803@gmail.com> References: <AANLkTi=4Ay%2BxRFiyJopbGjf-nUQ9y6h0QJTT8oncNSZ6@mail.gmail.com> <F61DEFCA-7028-415D-B8D3-3ED63FC017D7@freebsd.org> <7AF92FAC-CE4B-46B4-ACB8-8B9022FEF803@gmail.com>
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On 12/08/10 16:08, Justin Hibbits wrote: > On Dec 7, 2010, at 9:56 AM, Nathan Whitehorn wrote: > >> >> On Dec 7, 2010, at 7:23 AM, Justin Hibbits wrote: >> >>> Since I started rebuilding ports yesterday, I've been hit by this panic >>> (copied from a low-res camera): >>> >>> panic: moea_pvo_to_pte: pvo 0x17e6810 pte does not match pte >>> 0x26e0740 in >>> moea_pteg_table >>> >>> 0xe52f68a0: at panic+0x13c >>> 0xe52f68f0: at moea_pvo_to_pte+0x154 >>> 0xe52f6910: at moea_pvo_remove+0x20 >>> 0xe52f6930: at moea_remove+0x94 >>> 0xe52f6960: at pmap_remove+0x80 >>> 0xe52f6980: at vm_map_delete+0x1d0 >>> 0xe52f69e0: at vm_map_remove+0x74 >>> 0xe52f6a00: at vmspace_exit+0x108 >>> 0xe52f6a30: at exit1+0x48c >>> 0xe52f6a70: at sys_exit+0x1c >>> 0xe52f6a80: at syscallenter+0x258 >>> ... >>> >>> The svn version is r215752, I'm currently building r216254 hoping >>> that might >>> fix something. This panic seems to occur after about 1-2 hours of >>> ports >>> building, so is reproducible to me. I also have the crash dumps >>> available >>> (2). >> >> This is a serious bug. Could you rebuild the kernel with the attached >> patch? That should provide some information on why the kernel has >> triggered this panic. Also, could you provide some more details on >> your system? I'm guessing it is some variety of G4, but knowing the >> specific CPU model and whether it is SMP would be very helpful. >> -Nathan >> <test.diff> > > Took a couple days, it seems to only crash while building packages > within the x11/xorg metapackage umbrella, which is odd.... I built all > of Qt and the rest of my desktop with no crash. > > Anyway, the details are: > > panic: moea_pvo_to_pte: pvo 0x413f5960 pte does not match pte > 0x2a33340 in moea_pteg_table (0x87399bbf.0x570a0180, > 0x87399bf.0x570a6012) > > And, it is fully reproducible for me just by backing up ports and > building x11/xorg. Weird. These are mappings for different, but nearby, pages, and the second mapping looks totally bogus (all WIMG bits are zero). It looks like you missed a character transcribing the second PTE values. Could you check them? -Nathan
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