[Bug translator/6979] using $$parms under uprobe probes might result in a uninitialized variable access.

["wenji dot huang at oracle dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From wenji dot huang at oracle dot com  2009-02-03 05:36 -------
Reproduced it using testsuite/systemtap.examples/general/para-callgraph.stp

$sudo stap -vv para-callgraph.stp 'kernel.function("*@fs/proc*.c")'
'kernel.function("sys_read")'
...
Pass 3: translated to C into
"/tmp/stapI6MOvi/stap_6d7c9a6d948642fb62a56ab0e7db8c2b_133065.c" in
1840usr/2400sys/4935real ms.
Running make -C "/lib/modules/2.6.29-rc3/build" M="/tmp/stapI6MOvi" modules
>/dev/null
cc1: warnings being treated as errors
/tmp/stapI6MOvi/stap_6d7c9a6d948642fb62a56ab0e7db8c2b_133065.c: In function
'probe_1422':
/tmp/stapI6MOvi/stap_6d7c9a6d948642fb62a56ab0e7db8c2b_133065.c:2569: warning:
's0' is used uninitialized in this function
make[1]: *** [/tmp/stapI6MOvi/stap_6d7c9a6d948642fb62a56ab0e7db8c2b_133065.o]
Error 1
make: *** [_module_/tmp/stapI6MOvi] Error 2
Pass 4: compiled C into "stap_6d7c9a6d948642fb62a56ab0e7db8c2b_133065.ko" in
17790usr/4530sys/22241real ms.
Pass 4: compilation failed.  Try again with another '--vp 0001' option.
$ stap -V
SystemTap translator/driver (version 0.8/0.131 commit d1d11e96 + changes)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
$ gcc -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-9.0.1)




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http://sourceware.org/bugzilla/show_bug.cgi?id=6979

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