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    SubjectRe: Possible dcache BUG
    On Fri, Aug 06, 2004 at 09:58:35AM -0700, Linus Torvalds wrote:
    >
    > Now, Chris Shoemaker reported dentry problems on a intel CPU and said that
    > wli had seen something too, but I'm wondering whether Chris and wli might
    > have been seeing the knfsd/xfs-related dentry bug that I found yesterday.
    > So I think the prefetch theory is still alive, but we should check with
    > Chris. Chris?
    >
    > Linus

    My oopses were not related to nfs or xfs. I don't use either of these
    on this box.

    In the interest of contributing more than conspiracy theories, I'm
    trying to dig up some records of the dcache problems I was having.
    Unfortunately, a period of low free disk space led to some aggressive
    "cleaning" on my part since then. :(

    I _was_ able to find the attached oops, but I don't think I have the
    corresponding object files, so I hope the decoding it contains is
    good enough.

    Just ask if you need some more info.

    -chris

    Mar 17 16:42:01 peace kernel: Unable to handle kernel paging request at virtual address 0b7eec1c
    Mar 17 16:42:01 peace kernel: printing eip:
    Mar 17 16:42:01 peace kernel: c01a6667
    Mar 17 16:42:01 peace kernel: *pde = 00000000
    Mar 17 16:42:01 peace kernel: Oops: 0000 [#1]
    Mar 17 16:42:01 peace kernel: PREEMPT DEBUG_PAGEALLOC
    Mar 17 16:42:01 peace kernel: CPU: 0
    Mar 17 16:42:01 peace kernel: EIP: 0060:[iput+23/112] Not tainted
    Mar 17 16:42:01 peace kernel: EFLAGS: 00010202
    Mar 17 16:42:01 peace kernel: EIP is at iput+0x17/0x70
    Mar 17 16:42:01 peace kernel: eax: 0b7eebf8 ebx: c33fee3c ecx: c33fee4c edx: c33fee4c
    Mar 17 16:42:01 peace kernel: esi: c33f2ef8 edi: cba32000 ebp: cba33e54 esp: cba33e50
    Mar 17 16:42:01 peace kernel: ds: 007b es: 007b ss: 0068
    Mar 17 16:42:01 peace kernel: Process kswapd0 (pid: 7, threadinfo=cba32000 task=cba559e0)
    Mar 17 16:42:01 peace kernel: Stack: c33fee3c cba33e88 c019f540 00000066 cba33e60 cba33e60 00000000 00000001
    Mar 17 16:42:01 peace kernel: 00000000 c11bcc40 0000003c 00000080 cba32000 0000009c cba33e90 c01a06d7
    Mar 17 16:42:01 peace kernel: cba33ec4 c01612d8 000e1048 00000000 000079d9 0000001d 00000000 cbffb654
    Mar 17 16:42:01 peace kernel: Call Trace:
    Mar 17 16:42:01 peace kernel: [prune_dcache+1120/1952] prune_dcache+0x460/0x7a0
    Mar 17 16:42:01 peace kernel: [shrink_dcache_memory+23/32] shrink_dcache_memory+0x17/0x20
    Mar 17 16:42:01 peace kernel: [shrink_slab+280/368] shrink_slab+0x118/0x170
    Mar 17 16:42:01 peace kernel: [balance_pgdat+492/528] balance_pgdat+0x1ec/0x210
    Mar 17 16:42:01 peace kernel: [kswapd+220/240] kswapd+0xdc/0xf0
    Mar 17 16:42:01 peace kernel: [autoremove_wake_function+0/64] autoremove_wake_function+0x0/0x40
    Mar 17 16:42:01 peace kernel: [ret_from_fork+6/20] ret_from_fork+0x6/0x14
    Mar 17 16:42:01 peace kernel: [autoremove_wake_function+0/64] autoremove_wake_function+0x0/0x40
    Mar 17 16:42:01 peace kernel: [kswapd+0/240] kswapd+0x0/0xf0
    Mar 17 16:42:01 peace kernel: [kernel_thread_helper+5/12] kernel_thread_helper+0x5/0xc
    Mar 17 16:42:01 peace kernel:
    Mar 17 16:42:01 peace kernel: Code: 8b 40 24 74 4a 85 c0 74 07 8b 50 14 85 d2 75 39 8d 43 1c ba
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