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Date: Thu, 6 Mar 2008 19:03:08 +0530 From: Srinivasa DS <srinivasa@...ibm.com> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> 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. On Thursday 06 March 2008 06:25:51 pm Mathieu Desnoyers wrote: > * 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.. ? No, on a bare x86_64 system. That shouldn't matter for this bug, A quick look at the call path shows me this. start_kernel()->rest_init()->kernel_init()->init_post()->mark_rodata_ro() Srinivasa DS > > Mathieu > > > Thanks > > Srinivasa DS > > LTC-IBM -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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