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    SubjectRe: 2.6.15-rc1-mm1
    Reuben Farrelly <reuben-lkml@reub.net> wrote:
    >
    > I don't think I should be able to make this happen so easily though:
    >
    >
    > [root@tornado ~]# rmmod e100
    > [root@tornado ~]# rmmod sky2
    > [root@tornado ~]# strace modprobe e100
    > Unable to handle kernel NULL pointer dereference at virtual address 00000010
    > printing eip:
    > c0124fc7
    > *pde = 00000000
    > Oops: 0000 [#1]
    > PREEMPT SMP
    > last sysfs file: /class/net/eth0/flags
    > Modules linked in: nfsd exportfs lockd sunrpc autofs4 lm85 hwmon_vid eeprom ipv6
    > binfmt_misc hw_random crc32 piix i2c_i801
    > CPU: 0
    > EIP: 0060:[<c0124fc7>] Not tainted VLI
    > EFLAGS: 00010202 (2.6.15-rc1-mm2-preempt)
    > EIP is at ptrace_check_attach+0x14/0xaf


    This might help..


    Begin forwarded message:

    Date: Fri, 18 Nov 2005 18:07:43 +0000
    From: Christoph Hellwig <hch@infradead.org>
    To: Badari Pulavarty <pbadari@us.ibm.com>
    Cc: akpm@osdl.org, lkml <linux-kernel@vger.kernel.org>
    Subject: Re: 2.6.15-rc1-mm1 panic in ptrace_check_attach()


    On Fri, Nov 18, 2005 at 09:56:40AM -0800, Badari Pulavarty wrote:
    > Hi Andrew,
    >
    > I am not sure if its already reported. I get panic in
    > ptrace_check_attach() while trying to run UML on 2.6.15-rc1-mm1.
    >
    > Going to try 2.6.15-rc1-mm2 now.

    Looks like 2.6.15-rc1-mm1 has total crap in ptrace_get_task_struct
    (and it looks like my fault because I sent out a wrong patch).

    The patch below should fix it:

    Index: linux-2.6/kernel/ptrace.c
    ===================================================================
    --- linux-2.6.orig/kernel/ptrace.c 2005-11-18 10:25:35.000000000 +0100
    +++ linux-2.6/kernel/ptrace.c 2005-11-18 10:25:54.000000000 +0100
    @@ -459,7 +459,7 @@
    read_unlock(&tasklist_lock);
    if (!child)
    return ERR_PTR(-ESRCH);
    - return 0;
    + return child;
    }

    #ifndef __ARCH_SYS_PTRACE
    -
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