Messages in this thread | | | Date | Thu, 6 Mar 2008 07:55:51 -0500 | From | Mathieu Desnoyers <> | Subject | Re: [BUG] Kprobes fails on 2.6.25-rc3-mm1 (x86) systems, if CONFIG_DEBUG_RODATA is set. |
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* 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
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