Messages in this thread | | | From | Srinivasa DS <> | Subject | [BUG] Kprobes fails on 2.6.25-rc3-mm1 (x86) systems, if CONFIG_DEBUG_RODATA is set. | Date | Thu, 6 Mar 2008 18:11:27 +0530 |
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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
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