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

[ananth at in dot ibm dot com]

------- Additional Comments From ananth at in dot ibm dot com  2008-06-17 07:12 -------
The NULL pointer deref is coming from the modules_op->start() call in
runtime/transport/symbols.c:

   606  static int _stp_init_modules(void)
     ....
   611          const struct seq_operations *modules_op = (const struct seq_oper
ations *)_stp_kallsyms_lookup_name("modules_op");
   612
   ......
   617
   618          /* Use the seq_file interface to safely get a list of installed
modules */
   619          res = modules_op->start(NULL, &pos); <-- here!
   620          while (res) {

The reason is that _stp_kallsyms_lookup_name returns an incorrect address (it
returns c11a0e0c while the actual address is c05a0e0c):

[root@jataayu mod]# cat /proc/kallsyms |grep modules_op
c048eee9 t modules_open
c05a0e0c R modules_op
c05a40d8 r proc_modules_operations

I've verified that *(c11a0e0c) is NULL causing the BUG.

-- 


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

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