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SubjectRe: Bisected regression (Was Re: current -git fails to boot on nehalem-ex)
On Thu, Dec 10 2009, Jens Axboe wrote:
> > >> [ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 0-fff BIOS data page
> > >
> > > mptable mpc is [12 - f011]
> > >
> > > what a BIOS !
> > >
> > > can you check if it works with 2.6.32 + "acpi=off"?
>
> I'll try that.

Yes, 2.6.32 boots fine with acpi=off passed.

> > please check if this one could workaround it.
> >
> > diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> > index d17d482..f60acec 100644
> > --- a/arch/x86/kernel/e820.c
> > +++ b/arch/x86/kernel/e820.c
> > @@ -732,7 +732,7 @@ struct early_res {
> > char overlap_ok;
> > };
> > static struct early_res early_res[MAX_EARLY_RES] __initdata = {
> > - { 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
> > + { 0, PAGE_SIZE, "BIOS data page", 1 }, /* BIOS data page */
> > {}
> > };
>
> And then this. Results in 10-15min.

Doesn't work, it just complains about a different overlap:

[ 0.000000] Kernel panic - not syncing: Overlapping early
reservations 12-f011 MP-table mpc to 6000-7fff TRAMPOLINE
[ 0.000000]
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.32 #51
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff813c709b>] panic+0xa0/0x16a
[ 0.000000] [<ffffffff8167d280>] ?
reserve_early_overlap_ok+0x2e/0x39
[ 0.000000] [<ffffffff8167d24a>] ?
drop_overlaps_that_are_ok+0x117/0x11f
[ 0.000000] [<ffffffff8167d133>] drop_overlaps_that_are_ok+0x0/0x11f
[ 0.000000] [<ffffffff8167d2c6>] reserve_early+0x3b/0x3d
[ 0.000000] [<ffffffff81683248>] smp_scan_config+0xe7/0x10e
[ 0.000000] [<ffffffff816832a9>] default_find_smp_config+0x3a/0x60
[ 0.000000] [<ffffffff8167b0be>] setup_arch+0x6ae/0xa88
[ 0.000000] [<ffffffff816789ff>] start_kernel+0x82/0x412
[ 0.000000] [<ffffffff81678289>] x86_64_start_reservations+0x99/0xb9
[ 0.000000] [<ffffffff81678389>] x86_64_start_kernel+0xe0/0xf2

--
Jens Axboe



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