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[Bug runtime/15757] New: on x86_64, 32-bit user backtraces truncated


http://sourceware.org/bugzilla/show_bug.cgi?id=15757

            Bug ID: 15757
           Summary: on x86_64, 32-bit user backtraces truncated
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com

On x86_64 RHEL6 (2.6.32-358.6.1.el6.x86_64), there are 296 passes and 80
failures in the systemtap.exelib/exelib.exp testcase. Here are the failures:

====
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-debug_uprobeslibgcc-O3-m32-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-sep-debug_uprobeslibgcc-O3-m32-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-debug_uprobeslibgcc-O3-m32-prelink-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug_uprobeslibgcc-O3-m32-prelink-sep-debug
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
main_func (2)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_main (0)
FAIL:
ustack-uprobesgcc-O3-m32-pie-sep-debug-uprobeslibgcc-O3-m32-prelink-sep-debug-after_uprobeslibgcc-O3-m32-prelink-sep-debug-after
lib_func (2)
====

In reality, there is really only one type of failure being pointed out here,
the fact that 32-on-64-bit executables have short user backtraces. The failures
are magnified because the test executable gets compiled lots of different ways
- different levels of optimization, with/without prelink, etc.

>From the systemtap.log file for a 64-bit executable:

====
 0x4005f0 : main_func+0x0/0x50
[...suite/uprobesgcc-O3-m64-debug-uprobeslibgcc-O3-m64-debug_exe]
 0x400658 : main+0x18/0x30
[...suite/uprobesgcc-O3-m64-debug-uprobeslibgcc-O3-m64-debug_exe]
 0x381081ecdd : __libc_start_main+0xfd/0x1d0 [/lib64/libc-2.12.so]
 0x400529 : _start+0x29/0x2c
[...suite/uprobesgcc-O3-m64-debug-uprobeslibgcc-O3-m64-debug_exe]
====

Here's the same backtrace, but for a 32-on-64-bit version of that executable:

====
 0x80484c0 : main_func+0x0/0x50
[...suite/uprobesgcc-O3-m32-debug-uprobeslibgcc-O3-m32-debug_exe]
====

The test script (in systemtap.exelib/libmarkunamestack.stp) calls      
print_ubacktrace().

On x86_64 rawhide (3.11.0-0.rc0.git7.1.fc20.x86_64), this test passes
completely.

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