On 04/10/2011 05:23 PM, Jan Kiszka wrote:
On 2011-04-10 16:01, Avi Kivity wrote:
> On 04/08/2011 11:52 PM, Jan Kiszka wrote:
>> QEMU's gdbstub in KVM mode is simply not designed to account for guests
>> swapping out code pages that contain breakpoints. Due to the fact that
>> the Linux kernel does not do these weird things to its own code,
>
> It actually happily patches its own code at certain circumstances. If
> you debug early boot or suspend/resume or cpu hotplug you're likely to
> encounter them.
Yes, it patches (alternates, jump_labels, mcount etc.), but it doesn't
swap or move code pages. At least so far.
Try using modules (though that's different - the virtual addresses will
change too). Or debugging a mixed kernel/user workload.
If you need to break at such locations, there are still hardware
breakpoints, though only 4.
Right.
--
error compiling committee.c: too many arguments to function
