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    SubjectRe: Bisected regression (Was Re: current -git fails to boot on nehalem-ex)
    On Thu, Dec 10 2009, Yinghai Lu wrote:
    > Yinghai Lu wrote:
    > > Jens Axboe wrote:
    > >> On Thu, Dec 10 2009, Yinghai wrote:
    > >>>
    > >>>
    > >>> On Dec 10, 2009, at 8:06 AM, Ingo Molnar <mingo@elte.hu> wrote:
    > >>>
    > >>>> * Jens Axboe <jens.axboe@oracle.com> wrote:
    > >>>>
    > >>>>> On Thu, Dec 10 2009, Jens Axboe wrote:
    > >>>>>> Hi,
    > >>>>>>
    > >>>>>> As written in the subject, it just hard hangs before writing
    > >>>>>> anything on
    > >>>>>> the console. With earlyprintk, I captured the failure, see below.
    > >>>>>>
    > >>>>>> I'll try and bisect this, but it takes some time (since the bios and
    > >>>>>> post process takes forever). I just updated the firmware on the
    > >>>>>> box as
    > >>>>>> well, but it did boot 2.6.32 (and RHEL5 boots fine too). Of course
    > >>>>>> that
    > >>>>>> doesn't rule out a BIOS bug.
    > >>>>> Results are persistent, git bisect points to:
    > >>>>>
    > >>>>> commit b24c2a925a9837cccf54d50aeac22ba0cbc15455
    > >>>>> Author: Yinghai Lu <yinghai@kernel.org>
    > >>>>> Date: Tue Nov 24 02:48:18 2009 -0800
    > >>>>>
    > >>>>> x86: Move find_smp_config() earlier and avoid bootmem usage
    > >>>>>
    > >>>>> which appears consistent with the panic(). Reverting that does indeed
    > >>>>> make current -git boot properly.
    > >>>> Thanks. Yinghai, do you have any ideas, or should we revert it?
    > >>>>
    > >>> Let find the root cause
    > >>>
    > >>> Jen
    > >> Jens :-)
    > >>
    > >>> Can you boot with earlyconsole or earlyprintk and debug?
    > >> The original report already included oops output from earlyprintk, it's
    > >> below as well.
    > >>
    > >> kernel /vmlinuz-2.6 root=/dev/sda3 ro console=ttyS0,115200 console=tty0 earlyp
    > >> rintk=serial,ttyS0,115200
    > >> [Linux-bzImage, setup=0x3200, size=0x298f90]
    > >>
    > >>
    > >> [ 0.000000] Linux version 2.6.32 (axboe@nehalem) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #35 SMP Thu Dec 10 09:47:51 CET 2009 *
    > >> [ 0.000000] Command line: root=/dev/sda3 ro console=ttyS0,115200 console=tty0 earlyprintk=serial,ttyS0,115200 *
    > >> [ 0.000000] BIOS-provided physical RAM map: *
    > >> [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009a400 (usable) *
    > >> [ 0.000000] BIOS-e820: 000000000009a400 - 00000000000a0000 (reserved) *
    > >> [ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)***
    > >> [ 0.000000] BIOS-e820: 0000000000100000 - 0000000078c75000 (usable)
    > >> [ 0.000000] BIOS-e820: 0000000078c75000 - 0000000078e89000 (ACPI NVS)
    > >> [ 0.000000] BIOS-e820: 0000000078e89000 - 000000007924e000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 000000007924e000 - 00000000792c2000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000792c2000 - 00000000792d2000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 00000000792d2000 - 00000000792e7000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000792e7000 - 0000000079301000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079301000 - 0000000079303000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079303000 - 0000000079305000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079305000 - 0000000079310000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079310000 - 0000000079314000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079314000 - 0000000079319000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079319000 - 0000000079336000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079336000 - 0000000079358000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079358000 - 0000000079388000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079388000 - 00000000793c9000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000793c9000 - 000000007968f000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 000000007968f000 - 00000000796bb000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000796bb000 - 00000000799d8000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 00000000799d8000 - 0000000079bd8000 (ACPI NVS)
    > >> [ 0.000000] BIOS-e820: 0000000079bd8000 - 0000000079dc7000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079dc7000 - 0000000079dcb000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079dcb000 - 0000000079e1c000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 0000000079e1c000 - 0000000079e87000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000079e87000 - 000000007bd5f000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 000000007bd5f000 - 000000007be4f000 (reserved)
    > >> [ 0.000000] BIOS-e820: 000000007be4f000 - 000000007bf87000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 000000007bf87000 - 000000007bfcf000 (ACPI NVS)
    > >> [ 0.000000] BIOS-e820: 000000007bfcf000 - 000000007bfff000 (ACPI data)
    > >> [ 0.000000] BIOS-e820: 000000007bfff000 - 0000000090000000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000fc000000 - 00000000fd000000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000fed1c000 - 00000000fed20000 (reserved)
    > >> [ 0.000000] BIOS-e820: 00000000ff000000 - 0000000100000000 (reserved)
    > >> [ 0.000000] BIOS-e820: 0000000100000000 - 0000001080000000 (usable)
    > >> [ 0.000000] bootconsole [earlyser0] enabled
    > >> [ 0.000000] NX (Execute Disable) protection: active
    > >> [ 0.000000] DMI 2.5 present.
    > >> [ 0.000000] last_pfn = 0x1080000 max_arch_pfn = 0x400000000
    > >> [ 0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
    > >> [ 0.000000] last_pfn = 0x78c75 max_arch_pfn = 0x400000000
    > >> [ 0.000000] init_memory_mapping: 0000000000000000-0000000078c75000
    > >> [ 0.000000] init_memory_mapping: 0000000100000000-0000001080000000
    > >> [ 0.000000] ACPI: RSDP 00000000000f0410 00024 (v02 QUANTA)
    > >> [ 0.000000] ACPI: XSDT 000000007bffe120 000BC (v01 QUANTA QSSC-S4R 00000000 01000013)
    > >> [ 0.000000] ACPI: FACP 000000007bffd000 000F4 (v04 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: DSDT 000000007bfe3000 19BAD (v02 QUANTA QSSC-S4R 00000003 MSFT 0100000D)
    > >> [ 0.000000] ACPI: FACS 000000007bf87000 00040
    > >> [ 0.000000] ACPI: APIC 000000007bfe2000 003E4 (v02 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: MSCT 000000007bfe1000 00090 (v01 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] ACPI: MCFG 000000007bfe0000 0003C (v01 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] ACPI: HPET 000000007bfdf000 00038 (v01 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] ACPI: SLIT 000000007bfde000 0003C (v01 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] ACPI: SRAT 000000007bfdd000 00930 (v02 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] ACPI: SPCR 000000007bfdc000 00050 (v01 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: WDDT 000000007bfdb000 00040 (v01 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: SSDT 000000007bf4a000 3CFA4 (v02 QUANTA QSSC-S4R 00004000 INTL 20061109)
    > >> [ 0.000000] ACPI: SSDT 000000007bfda000 00174 (v02 QUANTA QSSC-S4R 00004000 INTL 20061109)
    > >> [ 0.000000] ACPI: PMCT 000000007bfd9000 00064 (v01 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: MIGT 000000007bfd8000 00040 (v01 QUANTA QSSC-S4R 00000000 MSFT 0100000D)
    > >> [ 0.000000] ACPI: TCPA 000000007bfd5000 00032 (v00 QUANTA QSSC-S4R 00000000 00000000)
    > >> [ 0.000000] ACPI: HEST 000000007bfd4000 005D0 (v01 QUANTA QSSC-S4R 00000001 INTL 00000001)
    > >> [ 0.000000] ACPI: BERT 000000007bfd3000 00030 (v01 QUANTA QSSC-S4R 00000001 INTL 00000001)
    > >> [ 0.000000] ACPI: ERST 000000007bfd2000 00230 (v01 QUANTA QSSC-S4R 00000001 INTL 00000001)
    > >> [ 0.000000] ACPI: EINJ 000000007bfd1000 00130 (v01 QUANTA QSSC-S4R 00000001 INTL 00000001)
    > >> [ 0.000000] ACPI: DMAR 000000007bfd0000 00350 (v01 QUANTA QSSC-S4R 00000001 MSFT 0100000D)
    > >> [ 0.000000] found SMP MP-table at [ffff8800000fdd80] fdd80
    > >> [ 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.

    > 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.

    --
    Jens Axboe



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