Date: Tue, 07 Dec 2010 08:56:21 -0600 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Justin Hibbits <jrh29@alumni.cwru.edu> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: Kernel panic in moea_pvo_to_pte Message-ID: <F61DEFCA-7028-415D-B8D3-3ED63FC017D7@freebsd.org> In-Reply-To: <AANLkTi=4Ay%2BxRFiyJopbGjf-nUQ9y6h0QJTT8oncNSZ6@mail.gmail.com> References: <AANLkTi=4Ay%2BxRFiyJopbGjf-nUQ9y6h0QJTT8oncNSZ6@mail.gmail.com>
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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
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Index: mmu_oea.c
===================================================================
--- mmu_oea.c (revision 216174)
+++ mmu_oea.c (working copy)
@@ -2116,7 +2116,9 @@
if (((pt->pte_lo ^ pvo->pvo_pte.pte.pte_lo) & ~(PTE_CHG|PTE_REF))
!= 0) {
panic("moea_pvo_to_pte: pvo %p pte does not match "
- "pte %p in moea_pteg_table", pvo, pt);
+ "pte %p in moea_pteg_table (%#x.%#x, %#x.%#x)",
+ pvo, pt, pt->pte_hi, pt->pte_lo,
+ pvo->pvo_pte.pte.pte_hi, pvo->pvo_pte.pte.pte_lo);
}
mtx_assert(&moea_table_mutex, MA_OWNED);
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