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