Paul B Mahol wrote:
On 11/6/10, Jia-Shiun Li <[email protected]> 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
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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