Re: x86-64 2.6.15-rc2-git5 fails to boot with 4GB memory

From: Matti Aarnio (matti.aarnio_at_zmailer.org)
Date: 11/30/05

  • Next message: Richard Knutsson: "[PATCH 1/6] arch: Replace pci_module_init() with pci_register_driver()" 
    Date:	Wed, 30 Nov 2005 01:53:04 +0200
To: Andi Kleen <ak@suse.de>

    On Tue, Nov 29, 2005 at 07:01:12AM -0700, Andi Kleen wrote:
    > Matti Aarnio <matti.aarnio@zmailer.org> writes:
    >
    > > With 2 GB in place, the kernel boots just fine, but with
    > > 4 GB, it reports:
    >
    > Works for me on several machines.
    >
    > I even have a fix for the Asus wrong MCFG problem now that
    > broke the IOMMU on these boards (workaround is pci=nommconf)
    >
    > >
    > > kernel direct mapping tables upto ffff 8101 5000 000 @ 8000-f000
    > > PANIC: early exception rip ffff ffff 8016 f002 error 0 cr2 4230
    > > PANIC: early exception rip ffff ffff 8011 d1fe error 0 cr2 ffff ffff f5ff d023
    > >
    > > and some other lines, which I didn't jot down on paper...
    >
    > Can you please look up the RIP values in your System.map?
    >
    > > These were copied from some Fedora Core development kernel version
    > > after 2.6.15-rc1 (last working one) in a box with 4 GB memory.
    >
    > Please try vanilla 2.6.15rc2 as a reference at least.

    Tried. Crashes with 4 GB memory present in the box.
    Boots and runs nicely with 2 GB memory populated in.

    After adding -g to *CFLAGS of top-level Makefile, and
    trying to determine WHERE those PANICs happened in rc2:

    (gdb) list *0xffffffff80163a43
    0xffffffff80163a43 is in memmap_init_zone (mm/page_alloc.c:1687).
    1682 for (pfn = start_pfn; pfn < end_pfn; pfn++, page++) {
    1683 if (!early_pfn_valid(pfn))
    1684 continue;
    1685 if (!early_pfn_in_nid(pfn, nid))
    1686 continue;
    1687 page = pfn_to_page(pfn);
    1688 set_page_links(page, zone, nid, pfn);
    1689 set_page_count(page, 1);
    1690 reset_page_mapcount(page);
    1691 SetPageReserved(page);

    (gdb) list *0xffffffff801196fa
    0xffffffff801196fa is in safe_smp_processor_id (include/asm/smp.h:77).
    72 #define raw_smp_processor_id() read_pda(cpunumber)
    73
    74 static inline int hard_smp_processor_id(void)
    75 {
    76 /* we don't want to mark this access volatile - bad code generation */
    77 return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
    78 }
    79
    80 extern int safe_smp_processor_id(void);
    81 extern int __cpu_disable(void);

    Not that those explain all that much...

    > -Andi

    /Matti Aarnio
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

  • Next message: Richard Knutsson: "[PATCH 1/6] arch: Replace pci_module_init() with pci_register_driver()"

    Relevant Pages