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    SubjectRe: kernel BUG at pageattr:107
    This was fixed a few days ago in a recent patch, titled:

    x86_64: Don't look up struct page pointer of physical address in iounmap

    It's only a one-line change:

    tree b5d1e3e603823d798b77a91641f63f10a0a733b1
    parent 1f5ee8da005f50d9f46ae5a7edba9a9c2d37b32e
    author Andi Kleen <ak@suse.de> Tue, 17 May 2005 11:53:24 -0700
    committer Linus Torvalds <torvalds@ppc970.osdl.org> Tue, 17 May 2005 21:59:14 -0700

    [PATCH] x86_64: Don't look up struct page pointer of physical address in iounmap

    It could be in a memory hole not mapped in mem_map and that causes the hash
    lookup to go off to nirvana.

    Signed-off-by: Andi Kleen <ak@suse.de>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>

    arch/x86_64/mm/ioremap.c | 2 +-
    1 files changed, 1 insertion(+), 1 deletion(-)

    Index: arch/x86_64/mm/ioremap.c
    ===================================================================
    --- 4abd4f432bd1d8def0992ee55bb00a0d556122d3/arch/x86_64/mm/ioremap.c (mode:100644
    sha1:74ec8554b195de6c5a9b87ce5d39f08d9c5da544)
    +++ b5d1e3e603823d798b77a91641f63f10a0a733b1/arch/x86_64/mm/ioremap.c (mode:100644
    sha1:c6fb0cb69992bbf14a2f42d4ddde10b298cd9316)
    @@ -272,7 +272,7 @@ void iounmap(volatile void __iomem *addr
    if ((p->flags >> 20) &&
    p->phys_addr + p->size - 1 < virt_to_phys(high_memory)) {
    /* p->size includes the guard page, but cpa doesn't like that */
    - change_page_attr(virt_to_page(__va(p->phys_addr)),
    + change_page_attr_addr((unsigned long)__va(p->phys_addr),
    p->size >> PAGE_SHIFT,
    PAGE_KERNEL);
    global_flush_tlb();
    Anil Kumar wrote:
    > Hi,
    >
    > I am getting the following error message as part of stack trace.
    > I have a system with > 4G mem with RHEL4 x86_64. I installed the OS
    > and when I did the reboot, the system failed with a stack trace with
    > errors as follows:
    >
    > Intializing hardware.....
    > kernel BUG at pageattr:107
    > Invalid operand:0000 [1] SMP
    > Modules linked in: hw_random tg3 floppy sd_mod aic79xx(U) scsi_mod
    > dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod
    > pid: 1217,comm:modprobe....
    > ..............
    > ................
    > ...............
    > RIP ...{__change_page_attr+1039}
    > /etc/rc.d/rc.sysinit: line 167: 1217 Segmentation fault modprobe $1
    >
    >>/dev/null 2>&1
    >
    >
    > I wanted to know if aic79xx driver is having some problems or is it
    > kernel/scsi subsystem. I don't see the stack trace pointing to aic79xx
    > driver at all.
    >
    > Also, the above issue is only for > 4G mem.
    >
    > Thanks in advance for the help.
    >
    > with regards,
    > Anil
    > -
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    --
    Timur Tabi
    Staff Software Engineer
    timur.tabi@ammasso.com

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    -- Ed Smylie, NASA engineer for Apollo 13
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