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    SubjectRe: 2.6.18-mm2 boot failure on x86-64
    On Wed, Oct 04, 2006 at 05:06:59PM -0700, Andrew Morton wrote:
    > On Wed, 04 Oct 2006 11:41:59 -0500
    > Steve Fox <drfickle@us.ibm.com> wrote:
    >
    > > On Wed, 2006-10-04 at 08:45 -0700, Andrew Morton wrote:
    > > > On Wed, 04 Oct 2006 08:42:28 -0500
    > > > Steve Fox <drfickle@us.ibm.com> wrote:
    > > > > Sorry for the delay. I was finally able to perform a bisect on this. It
    > > > > turns out the patch that causes this is
    > > > > x86_64-mm-re-positioning-the-bss-segment.patch, which seems like a
    > > > > strange candidate, but sure enough I can boot to login: right up until
    > > > > that patch is applied.
    > > >
    > > > hm, that patch was merged into mainline September 29. Does mainline work?
    > >
    > > -git21 also fails with this same error.
    > >
    >
    > OK, thanks. And we know that
    > x86_64-mm-re-positioning-the-bss-segment.patch triggered this failure. And
    > that patch is non-buggy, and the xfrm code is probably non-buggy. So we don't
    > know squat, and we're going to need to debug this crash.
    >
    > Well. There is one trick we could use: apply
    > x86_64-mm-re-positioning-the-bss-segment.patch to 2.6.18 base and see if it
    > crashes. If it doesn't, then we can theorise that the bug is some buggy
    > post 2.6.18 patch which is being exposed by

    I think most likely it would crash on 2.6.18. Keith mannthey had reported
    a different crash on 2.6.18-rc4-mm2 when this patch was introduced first
    time. Following is the link to the thread.

    http://marc.theaimsgroup.com/?l=linux-kernel&m=115629369729911&w=2

    Following is the backtrace he had reported.

    Unable to handle kernel NULL pointer dereference at 0000000000000007
    RIP:
    [<ffffffff803d45b0>] __unix_insert_socket+0x49/0x5a
    PGD 115c934067 PUD 115c935067 PMD 0
    Oops: 0002 [1] SMP
    last sysfs file:
    CPU 14
    Modules linked in:
    Pid: 1, comm: init Not tainted 2.6.18-rc4-mm2-smp #3
    RIP: 0010:[<ffffffff803d45b0>] [<ffffffff803d45b0>]
    __unix_insert_socket+0x49/0x5a
    RSP: 0018:ffff810460605eb8 EFLAGS: 00010286
    RAX: ffffffffffffffff RBX: ffff81115c171c80 RCX: 0000000000000000
    RDX: ffff81115c171c88 RSI: ffff81115c171c80 RDI: ffffffff806656e0
    RBP: ffffffff806656e0 R08: ffff81115c069200 R09: ffff8110700b4000
    R10: 0000000000000000 R11: 0000000000000002 R12: ffff81115c170d00
    R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
    FS: 00002b793a4fd6d0(0000) GS:ffff81115c910e40(0000)
    knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 0000000000000007 CR3: 000000115c92d000 CR4: 00000000000006e0
    Process init (pid: 1, threadinfo ffff810460604000, task
    ffff81115cb10040)
    Stack: 0000000100000001 00000000ffffffff ffff81115c171c80
    ffffffff803d58e9
    ffffffff8045bb30 0000000180298f61 ffffffff80498080 0000000000000001
    ffff81115c170d00 ffffffff803d595d 0000000000000004 ffffffff80376061
    Call Trace:
    [<ffffffff803d58e9>] unix_create1+0xf3/0x107
    [<ffffffff803d595d>] unix_create+0x60/0x6b
    [<ffffffff80376061>] __sock_create+0x12f/0x227
    [<ffffffff80376429>] sys_socket+0xf/0x37
    [<ffffffff8020968e>] system_call+0x7e/0x83


    Code: 48 89 50 08 48 89 55 00 48 89 6a 08 41 58 5b 5d c3 c7 47 08
    RIP [<ffffffff803d45b0>] __unix_insert_socket+0x49/0x5a
    RSP <ffff810460605eb8>
    CR2: 0000000000000007
    <0>Kernel panic - not syncing: Attempted to kill init!

    Thanks
    Vivek
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