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SystemTap vs. FC5 Xen kernels (was: 03-23-2006 Meeting minutes)


William Cohen wrote:
> Roland McGrath wrote:
>>> I tried this on x86_64 - and immediately ran into a problem with the
>>> debuginfo.
>> 
>> 
>> This was already noticed and is some problem in the kernel rpm specs.
>> There may be an fc5 bug report for it already on bugzilla.redhat.com,
>> I'm not sure.
> 
> Xen x86_64 kernels in kernel debuginfo package do not contain dwarf
> symbols 
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=185662


I found two differences in the config files that will prevent SystemTap
from running on the Xen kernels.  In 2054_FC5 and 2054_FC5kdump, the
config files have:

    CONFIG_KPROBES=y
    ...
    CONFIG_DEBUG_INFO=y

Whereas in 2054_FC5xen0 and 2054_xenU, the config files have:

    # CONFIG_KPROBES is not set

... with no mention of CONFIG_DEBUG_INFO.  This might explain the
missing dwarf info in the kernel-debuginfo package.  And of course for
SystemTap we need CONFIG_KPROBES=y.


Josh


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