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From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Srinivasa DS <srinivasa@in.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, ananth@in.ibm.com,
	Jim Keniston <jkenisto@us.ibm.com>,
	srikar@linux.vnet.ibm.com,
	SystemTAP <systemtap@sources.redhat.com>
Subject: Re: [BUG] Kprobes fails on 2.6.25-rc3-mm1 (x86) systems, if CONFIG_DEBUG_RODATA is set.
Date: Thu, 6 Mar 2008 07:55:51 -0500	[thread overview]
Message-ID: <20080306125551.GA1597@Krystal> (raw)
In-Reply-To: <200803061811.27555.srinivasa@in.ibm.com>

* Srinivasa DS (srinivasa@in.ibm.com) wrote:
> Insertion of kprobe module causes oops on 2.6.25-rc3-mm1 (x86) systems if we 
> enable CONFIG_DEBUG_RODATA.  While registering the probe, memcpy() fails to 
> copy breakpoint instruction to the instruction address and generates the 
> oops.
> 
> BUG: unable to handle kernel paging request at ffffffff8047d1a7
> IP: [<ffffffff8047ff62>] text_poke+0xa/0x10
> PGD 203067 PUD 207063 PMD 7e191163 PTE 47d161
> Oops: 0003 [1] PREEMPT SMP
> ................................................
> 
> This is because, Mathieu's patch (http://lkml.org/lkml/2008/2/2/226) makes 
> entire text segment as READONLY, if we enable CONFIG_DEBUG_RODATA. 
> 
> So reverting this patch or new patch, which considers kprobes while deciding  
> boundary for setting readonly pages might solve the probelm.
> 

Hi,

Are you running under Xen, lguest, kvm.. ?

Mathieu

> Thanks
>  Srinivasa DS
>  LTC-IBM
>  
> 
> 
> 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

  reply	other threads:[~2008-03-06 12:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-06 12:41 [BUG] Kprobes fails on 2.6.25-rc3-mm1 (x86) systems, if CONFIG_DEBUG_RODATA is set Srinivasa DS
2008-03-06 12:55 ` Mathieu Desnoyers [this message]
2008-03-06 13:33   ` Srinivasa DS
2008-03-06 13:48     ` [PATCH] x86 - Enhance DEBUG_RODATA support - alternatives Mathieu Desnoyers
2008-03-06 14:01       ` Ingo Molnar
2008-03-06 13:59         ` pageexec
2008-03-06 15:52           ` Ingo Molnar
2008-03-06 16:21           ` Andi Kleen
2008-03-06 17:25           ` Mathieu Desnoyers
2008-03-11 12:17             ` Andi Kleen
2008-03-06 14:18         ` Mathieu Desnoyers

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