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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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