[Bug runtime/24448] New: exelib.exp regressed on rhel8

["mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24448

            Bug ID: 24448
           Summary: exelib.exp regressed on rhel8
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: mcermak at redhat dot com
  Target Milestone: ---

Created attachment 11740
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11740&action=edit
test logs

The exelib.exp testcase regressed comparing rhel-7 and rhel-8. The test only
runs with -O3 by default.  Re-running it with -O0 showed some failures, and
with -O0 the test passed.

The first failure I see (with the default -O3) is:

=======
8.0 Server x86_64 # gcc
/usr/share/systemtap/testsuite/systemtap.exelib/uprobes_lib.c
-isystem/usr/share/systemtap/testsuite -isystem/usr/include -g -m32 -O3 -fPIC
-shared -lm -o ./libuprobeslibgcc-O3-m32-debug.so
8.0 Server x86_64 # gcc
/usr/share/systemtap/testsuite/systemtap.exelib/uprobes_exe.c
-isystem/usr/share/systemtap/testsuite -isystem/usr/include -g -m32 -O3 -L.
-luprobeslibgcc-O3-m32-debug -Wl,-rpath,. -lm -o
./uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe
8.0 Server x86_64 # stap -w --ldd
/usr/share/systemtap/testsuite/systemtap.exelib/libmarkunamestack.stp
./uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe
./libuprobeslibgcc-O3-m32-debug.so -c
./uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe
main
exe: main=main
main_func: 3
exe: main_func=main_func
print_ubacktrace exe 0
0x8048580 : main_func+0x0/0x50
[...yeyJV/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
0x8048422 : main+0x22/0x40
[...yeyJV/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
main_count: 3
main_func: 2
exe: main_func=main_func
print_usyms exe 1
0x8048580 : main_func+0x0/0x50
[...yeyJV/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
0x80485a7 : main_func+0x27/0x50
[...yeyJV/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
0x8048422 : main+0x22/0x40
[...yeyJV/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
main_count: 2
main_func: 1
exe: main_func=main_func
main_count: 1
lib_main
lib: lib_main=lib_main
lib_func: 3
lib: lib_func=lib_func
print_ubacktrace lib 2
0xf7fc1480 : lib_func+0x0/0x50
[/tmp/tmp.98qTgyeyJV/libuprobeslibgcc-O3-m32-debug.so]
0xf7fc14f0 : lib_main+0x20/0x2c
[/tmp/tmp.98qTgyeyJV/libuprobeslibgcc-O3-m32-debug.so]
func_count: 5360

^^^^^^^^^^^^^^^^^^ HERE the hitcount should be 3

Pass 5: run failed. [man error::pass5]
(1) 8.0 Server x86_64 #
=======

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