[Bug runtime/6646] SystemTap scripts fail with an Oops on x86

[wenji dot huang at oracle dot com]

------- Additional Comments From wenji dot huang at oracle dot com  2008-06-18 07:22 -------
To reproduce the problem,  just make  a little kernel config change and compile
it again.
Then execute any stap script,  it will fail in _stp_transport_init (kernel oops).

Both  _stp_kallsyms_lookup_name and _stp_init_kernel_symbols depend on 
_stp_kernel_symbols which is from debuginfo file or /proc/kallsyms.   I believe
 runtime facility such as transport shouldn't trust debuginfo too much .  The
incorrect debuginfo would result in kprobe register/trigger error,  not earlier
stp_transport_init.

The origin code about retrieving kernel symbols is to read /sys/modules/ which
looks like safer although not very graceful.



-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=6646

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