Message-ID: <86802c441001051102j547f10bga2b40fbaee9cf623@mail.gmail.com>
Date:	Tue, 5 Jan 2010 11:02:14 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Anders Eriksson <aeriksson@...tmail.fm>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: Memory probing fails after 2.6.30 (bisected)

On Tue, Jan 5, 2010 at 3:02 AM, Anders Eriksson <aeriksson@...tmail.fm> wrote:
>
> Hi,
>
> Upgrading my laptop's kernel, I discovered that it reboots immediately after
> boot on .31 and later kernels. Grub loads it, but I cannot get one line of
> text out of it before it reboots, even using boot_delay.
>
> Bisecting I came up with the following:
>
> git bisect start
> # good: [07a2039b8eb0af4ff464efd3dfd95de5c02648c6] Linux 2.6.30
> git bisect good 07a2039b8eb0af4ff464efd3dfd95de5c02648c6
> # bad: [74fca6a42863ffacaf7ba6f1936a9f228950f657] Linux 2.6.31
> git bisect bad 74fca6a42863ffacaf7ba6f1936a9f228950f657
> # bad: [925d74ae717c9a12d3618eb4b36b9fb632e2cef3] V4L/DVB (11736): videobuf: modify return value of VIDIOC_REQBUFS ioctl
> git bisect bad 925d74ae717c9a12d3618eb4b36b9fb632e2cef3
> # bad: [e349792a385ed47390d156155b1a1e19af1bf163] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
> git bisect bad e349792a385ed47390d156155b1a1e19af1bf163
> # bad: [c9059598ea8981d02356eead3188bf7fa4d717b8] Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block
> git bisect bad c9059598ea8981d02356eead3188bf7fa4d717b8
> # bad: [59c288ffb6dfb55bdd6bfe6826ab6203ff791930] Merge branches 'frv' and 'mn10300'
> git bisect bad 59c288ffb6dfb55bdd6bfe6826ab6203ff791930
> # bad: [3f6280ddf25fa656d0e17960588e52bee48a7547] Merge branch 'iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect bad 3f6280ddf25fa656d0e17960588e52bee48a7547
> # good: [c44e3ed539e4fc17d6bcb5eaecb894a94de4cc5f] Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect good c44e3ed539e4fc17d6bcb5eaecb894a94de4cc5f
> # bad: [be15f9d63b97da0065187696962331de6cd9de9e] Merge branch 'x86-xen-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect bad be15f9d63b97da0065187696962331de6cd9de9e
> # bad: [9b29e8228a5c2a169436a1a90a60b1f88cb35cd1] Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect bad 9b29e8228a5c2a169436a1a90a60b1f88cb35cd1
> # bad: [35d5a9a61490bf39d2e48d7f499c8c801a39ebe9] x86: fix system without memory on node0 ---> Got a BIOS-88 map
> git bisect bad 35d5a9a61490bf39d2e48d7f499c8c801a39ebe9
> # bad: [45fbe3ee01b8e463b28c2751b5dcc0cbdc142d90] x86, e820, pci: reserve extra free space near end of RAM ---> Got a BIOS-88 map
> git bisect bad 45fbe3ee01b8e463b28c2751b5dcc0cbdc142d90
> # bad: [2b72394e4089643f11669d9610907a1442fe044a] x86: move max_pfn_mapped and max_low_pfn_mapped to setup.c ---> Got a BIOS-88 map
> git bisect bad 2b72394e4089643f11669d9610907a1442fe044a
> # good: [6424fb38667fffbbb1b90be0ffd9a0c540db6a4b] x86: remove (null) in /sys kernel_page_tables
> git bisect good 6424fb38667fffbbb1b90be0ffd9a0c540db6a4b
> # bad: [89388913f2c88a2cd15d24abab571b17a2596127] x86: unify noexec handling --> Got a BIOS-88 map
> git bisect bad 89388913f2c88a2cd15d24abab571b17a2596127
> # bad: [8ecee4620e76aae418bfa0e8cc830e92cb559bbb] Merge branch 'linus' into x86/mm ---> Got a BIOS-88 map
> git bisect bad 8ecee4620e76aae418bfa0e8cc830e92cb559bbb
>
>
> I've annotated some bad kernels, where I _do_ get it to start, but it only
> finds a BIOS-88 map (and hence only 16MB ram, and userspace triggers OOMK).
>
> I found your name in the commit bisect fingered, hence I turn to you for help.
>
> Here's a dmesg from the last known good kernel :
>
> Linux version 2.6.29-01001-g6424fb3 (root@...ven) (gcc version 4.3.2 (Gentoo 4.3.2-r3 p1.6, pie-10.1.5) ) #22 SMP Tue Jan 5 11:12:56 CET 2010
> KERNEL supported cpus:
>  Intel GenuineIntel
>  AMD AuthenticAMD
>  NSC Geode by NSC
>  Cyrix CyrixInstead
>  Centaur CentaurHauls
>  Transmeta GenuineTMx86
>  Transmeta TransmetaCPU
>  UMC UMC UMC UMC
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000000000 - 000000000009ae20 (usable)
>  BIOS-e820: 000000000009ae20 - 00000000000a0000 (reserved)
>  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 000000007f7d0000 (usable)
>  BIOS-e820: 000000007f7d0000 - 000000007f7e5600 (reserved)
>  BIOS-e820: 000000007f7e5600 - 000000007f7f8000 (ACPI NVS)
>  BIOS-e820: 000000007f7f8000 - 000000007f800000 (reserved)
>  BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
>  BIOS-e820: 00000000fed20000 - 00000000fed9b000 (reserved)
>  BIOS-e820: 00000000feda0000 - 00000000fedc0000 (reserved)
>  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
>  BIOS-e820: 00000000ffb00000 - 00000000ffc00000 (reserved)
>  BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
> DMI 2.4 present.
> last_pfn = 0x7f7d0 max_arch_pfn = 0x100000
> MTRR default type: uncachable
> MTRR fixed ranges enabled:
>  00000-9FFFF write-back
>  A0000-BFFFF uncachable
>  C0000-CFFFF write-protect
>  D0000-EFFFF uncachable
>  F0000-FFFFF write-protect
> MTRR variable ranges enabled:
>  0 base 000000000 mask F80000000 write-back
>  1 base F7F800000 mask FFF800000 uncachable
>  2 base 0FEDA0000 mask FFFFE0000 uncachable
>  3 disabled
>  4 disabled
>  5 disabled
>  6 disabled
>  7 disabled

whole boot log with debug with boot command line?

>
> I can produce a pic of the dmesg for the fingered commit of needed.

boot that with earlyprintk=vga please.

YH
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