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Message-Id: <200803061811.27555.srinivasa@in.ibm.com> Date: Thu, 6 Mar 2008 18:11:27 +0530 From: Srinivasa DS <srinivasa@...ibm.com> To: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Cc: ananth@...ibm.com, Jim Keniston <jkenisto@...ibm.com>, srikar@...ux.vnet.ibm.com, SystemTAP <systemtap@...rces.redhat.com> Subject: [BUG] Kprobes fails on 2.6.25-rc3-mm1 (x86) systems, if CONFIG_DEBUG_RODATA is set. 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. 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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