Date: Sat, 06 Nov 2010 14:28:45 -0500 From: Alan Cox <alc@rice.edu> To: Paul B Mahol <onemda@gmail.com> Cc: alc@freebsd.org, Andriy Gapon <avg@icyb.net.ua>, Jia-Shiun Li <jiashiun@gmail.com>, current@freebsd.org Subject: Re: panic: invalid PDPE on recend amd64 Message-ID: <4CD5AC6D.2020705@rice.edu> In-Reply-To: <AANLkTin1UNrO7G_e_5k%2B_rMe0U7HizGtJ66igm5n6=Og@mail.gmail.com> References: <AANLkTimiEEXb6wVQMkjn2AKHM9tuPxF6eDX9w%2BrFyLXT@mail.gmail.com> <4CCC31C1.5090602@icyb.net.ua> <AANLkTin%2BmKfgwKN8YH1YOhx7cXFaUOM=Q2JjLVKQFe%2Bt@mail.gmail.com> <AANLkTimCXHeXb_bBOx7OzLC48V4=rzgsu1WzAgqnasY9@mail.gmail.com> <4CCC8752.7030403@gmail.com> <AANLkTinTauXYDqVSvwmYeyhuC8Pq9GBd=1mQVNuvvq1-@mail.gmail.com> <AANLkTin1UNrO7G_e_5k%2B_rMe0U7HizGtJ66igm5n6=Og@mail.gmail.com>
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Paul B Mahol wrote:
> On 11/6/10, Jia-Shiun Li <jiashiun@gmail.com> wrote:
>
>> Hi,
>>
>> I got a similar panic on amd64. Looking into the source it hit
>> KASSERT((base & (len - 1))) in pmap_demote_DMAP(). I replaced it with
>> a printf to see what triggered the assertion and here is the output.
>> Combined with memcontrol output 'bogus' keyword it seems buggy BIOS
>> violated some kind of spec and caused this. Is it fatal? It looks fine
>> on my machine without the assertion.
>>
>
> Send uname output. The fix for this issue got commited few days ago.
>
>
This is a different type of BIOS misconfiguration than your machine had.
I'm attaching a possible patch for this one.
Regards,
Alan
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filename="mtrr.patch"
Index: amd64/amd64/amd64_mem.c
===================================================================
--- amd64/amd64/amd64_mem.c (revision 214679)
+++ amd64/amd64/amd64_mem.c (working copy)
@@ -583,7 +583,7 @@ amd64_mrset(struct mem_range_softc *sc, struct mem
i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0;
mrd = sc->mr_desc + i;
for (; i < sc->mr_ndesc; i++, mrd++) {
- if (mrd->mr_flags & MDF_ACTIVE)
+ if ((mrd->mr_flags & (MDF_ACTIVE | MDF_BOGUS)) == MDF_ACTIVE)
pmap_demote_DMAP(mrd->mr_base, mrd->mr_len, FALSE);
}
@@ -688,7 +688,7 @@ amd64_mrinit(struct mem_range_softc *sc)
i = (sc->mr_cap & MR686_FIXMTRR) ? MTRR_N64K + MTRR_N16K + MTRR_N4K : 0;
mrd = sc->mr_desc + i;
for (; i < sc->mr_ndesc; i++, mrd++) {
- if (mrd->mr_flags & MDF_ACTIVE)
+ if ((mrd->mr_flags & (MDF_ACTIVE | MDF_BOGUS)) == MDF_ACTIVE)
pmap_demote_DMAP(mrd->mr_base, mrd->mr_len, TRUE);
}
}
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