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    SubjectRe: [Bug 8473] New: Oops: 0010 [1] SMP
    On Sun, 13 May 2007 14:02:50 -0700 bugme-daemon@bugzilla.kernel.org wrote:

    > http://bugzilla.kernel.org/show_bug.cgi?id=8473

    Please follow up via emailed reply-to-all.

    In fact, please report -mm bugs via email. bugzilla is more suited to
    longer-term problems, and -mm bugs are super-short-term, we hope.


    > Summary: Oops: 0010 [1] SMP
    > Kernel Version: 2.6.21-mm2
    > Status: NEW
    > Severity: high
    > Owner: akpm@osdl.org
    > Submitter: Nicolas.Mailhot@LaPoste.net
    >
    >
    > Most recent kernel where this bug did *NOT* occur: 2.6.21-mm1 (though I didn't
    > test it that long)
    > Distribution: Fedora Devel
    > Hardware Environment: AMD C2 on CK804
    > Software Environment: Normal workload (building a small package)
    > Problem Description:
    >
    > Steps to reproduce:
    > May 13 22:59:43 rousalka kernel: Unable to handle kernel NULL pointer
    > dereference at 0000000000000000 RIP:
    > May 13 22:59:43 rousalka kernel: [<0000000000000000>]
    > May 13 22:59:43 rousalka kernel: PGD bf1a067 PUD f295067 PMD 0
    > May 13 22:59:43 rousalka kernel: Oops: 0010 [1] SMP
    > May 13 22:59:43 rousalka kernel: CPU 0
    > May 13 22:59:43 rousalka kernel: Pid: 8758, comm: bash Not tainted
    > 2.6.21-9.mm2.fc7.nim #1
    > May 13 22:59:43 rousalka kernel: RIP: 0010:[<0000000000000000>]
    > [<0000000000000000>]
    > May 13 22:59:43 rousalka kernel: RSP: 0018:ffff81000ffedee0 EFLAGS: 00010296
    > May 13 22:59:43 rousalka kernel: RAX: ffffffff804426a0 RBX: ffff81000abe6a80
    > RCX: 00007fff565bbdc4
    > May 13 22:59:43 rousalka kernel: RDX: 0000000000005410 RSI: ffff81000abe6a80
    > RDI: ffff810009cc6fa0
    > May 13 22:59:43 rousalka kernel: RBP: 00007fff565bbdc4 R08: 0000000000000000
    > R09: 00000000009033a4
    > May 13 22:59:43 rousalka kernel: R10: 0000000000000008 R11: 0000000000000246
    > R12: 0000000000005410
    > May 13 22:59:43 rousalka kernel: R13: 00000000000000ff R14: 00000000000000ff
    > R15: 0000000000000000
    > May 13 22:59:43 rousalka kernel: FS: 00002b2d544faf40(0000)
    > GS:ffffffff8056b000(0000) knlGS:0000000000000000
    > May 13 22:59:43 rousalka kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > May 13 22:59:43 rousalka kernel: CR2: 0000000000000000 CR3: 000000000bdf4000
    > CR4: 00000000000006e0
    > May 13 22:59:43 rousalka kernel: Process bash (pid: 8758, threadinfo
    > ffff81000ffec000, task ffff81000bc82ac0)
    > May 13 22:59:43 rousalka kernel: Stack: ffffffff8028545d ffff81000abe6a80
    > 00007fff565bbdc4 00007fff565bbdc4
    > May 13 22:59:43 rousalka kernel: ffffffff802856ca 0000000000005410
    > 00000000000000ff ffff81000abe6a80
    > May 13 22:59:43 rousalka kernel: 0000000000000000 00007fff565bbdc4
    > 0000000000005410 00000000000000ff
    > May 13 22:59:43 rousalka kernel: Call Trace:
    > May 13 22:59:43 rousalka kernel: [<ffffffff8028545d>] do_ioctl+0x55/0x6b
    > May 13 22:59:43 rousalka kernel: [<ffffffff802856ca>] vfs_ioctl+0x257/0x270
    > May 13 22:59:43 rousalka kernel: [<ffffffff8028573c>] sys_ioctl+0x59/0x79
    > May 13 22:59:43 rousalka kernel: [<ffffffff8020955c>] tracesys+0xdc/0xe1
    > May 13 22:59:43 rousalka kernel:
    > May 13 22:59:43 rousalka kernel: INFO: lockdep is turned off.
    > May 13 22:59:43 rousalka kernel:
    > May 13 22:59:43 rousalka kernel: Code: Bad RIP value.
    > May 13 22:59:43 rousalka kernel: RIP [<0000000000000000>]
    > May 13 22:59:43 rousalka kernel: RSP <ffff81000ffedee0>
    > May 13 22:59:43 rousalka kernel: CR2: 0000000000000000

    Anything you can do to make that wordwrapping go away for ever would be
    great, thanks.

    I don't know what would have caused this. do_ioctl() did a jump-to-zero,
    but it has code in there to explicitly test for null pointers.

    Perhaps some weird race, although I find it hard to imagine how we could
    have such a race in any ioctl which bash is likely to be calling.

    Is it repeatable at all?
    -
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