[Bug tapsets/23879] New: print_ubacktrace can not print function name

["idealities at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23879

            Bug ID: 23879
           Summary: print_ubacktrace can not print function name
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: idealities at gmail dot com
  Target Milestone: ---

On archlinux, with kernel 4.18.16-arch1-1-ARCH, systemtap (version 4.0/0.174,
non-git sources), elfutils 0.174.

If use stap on target process originated from system packages,
print_ubacktrace() works fine:

$ stap -v  -e 'probe process.function("*") { print_ubacktrace(); exit() }' -x
4924
Pass 1: parsed user script and 470 library scripts using
75324virt/51500res/6800shr/44864data kb, in 100usr/10sys/110real ms.
Pass 2: analyzed script: 234 probes, 2 functions, 0 embeds, 0 globals using
77040virt/54192res/7668shr/46580data kb, in 10usr/0sys/11real ms.
Pass 3: translated to C into
"/tmp/stapOV3tv1/stap_1bc1f6af99b98d562e15bc3b6e4ee1a2_52098_src.c" using
77184virt/54628res/7924shr/46724data kb, in 10usr/100sys/111real ms.
Pass 4: compiled C into "stap_1bc1f6af99b98d562e15bc3b6e4ee1a2_52098.ko" in
3070usr/460sys/3418real ms.
Pass 5: starting run.
WARNING: Missing unwind data for a module, rerun with 'stap -d (unknown; retry
with -DDEBUG_UNWIND)'
 0x55c3c7f8f9c0 : ProcessList_scan+0x0/0x1a0 [/usr/bin/htop]
 0x55c3c7f90497 : ScreenManager_run+0x107/0x11e0 [/usr/bin/htop]
 0x55c3c7f86c51 : main+0x451/0x660 [/usr/bin/htop]
 0x7f067850d223
Pass 5: run completed in 10usr/20sys/1033real ms.


However if I compile a program manually, stap can only print an address,
without function name:

$ stap -v -DSTP_NO_BUILDID_CHECK -e 'probe process.function("*") {
print_ubacktrace(); exit() }' -x 5465
Pass 1: parsed user script and 470 library scripts using
75332virt/51852res/7144shr/44872data kb, in 90usr/10sys/106real ms.
Pass 2: analyzed script: 341 probes, 2 functions, 0 embeds, 0 globals using
77444virt/55028res/8080shr/46984data kb, in 10usr/0sys/14real ms.
Pass 3: using cached
/root/.systemtap/cache/3d/stap_3d92b79fdcedbfc63746fbaa7ff985f2_90414.c
Pass 4: using cached
/root/.systemtap/cache/3d/stap_3d92b79fdcedbfc63746fbaa7ff985f2_90414.ko
Pass 5: starting run.
WARNING: Missing unwind data for a module, rerun with 'stap -d (unknown; retry
with -DDEBUG_UNWIND)'
 0x5608a9394100
Pass 5: run completed in 10usr/20sys/1038real ms.

Is it the compatible error between new gcc versions and systemtap (or its
dependencies like elfutils) ? Thanks.

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