[Bug dyninst/17359] New: systemtap in dyninst mode fails to hit PLT probes

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

https://sourceware.org/bugzilla/show_bug.cgi?id=17359

            Bug ID: 17359
           Summary: systemtap in dyninst mode fails to hit PLT probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dyninst
          Assignee: systemtap at sourceware dot org
          Reporter: mcermak at redhat dot com

Systemtap in dyninst mode fails to hit PLT probes:

=====
# rpm -q dyninst systemtap coreutils coreutils-debuginfo
dyninst-8.1.2-6.el7.x86_64
systemtap-2.6-1.mcermak.70f3005.el7.x86_64
coreutils-8.22-11.el7.x86_64
coreutils-debuginfo-8.22-11.el7.x86_64
# stap -ve 'probe process.plt {log(pp())}' -c 'sleep 1'
Pass 1: parsed user script and 113 library script(s) using
218004virt/35320res/3048shr/32728data kb, in 140usr/10sys/152real ms.
Pass 2: analyzed script: 53 probe(s), 2 function(s), 0 embed(s), 0 global(s)
using 219060virt/36812res/3600shr/33784data kb, in 10usr/0sys/7real ms.
Pass 3: using cached
/root/.systemtap/cache/b3/stap_b350e486c9dd3a7be755c587eee68f84_8320.c
Pass 4: using cached
/root/.systemtap/cache/b3/stap_b350e486c9dd3a7be755c587eee68f84_8320.ko
Pass 5: starting run.
process("/usr/bin/sleep").statement(0x401360)
process("/usr/bin/sleep").statement(0x401310)
process("/usr/bin/sleep").statement(0x401450)
process("/usr/bin/sleep").statement(0x401280)
process("/usr/bin/sleep").statement(0x401250)
process("/usr/bin/sleep").statement(0x4014a0)
process("/usr/bin/sleep").statement(0x4012d0)
process("/usr/bin/sleep").statement(0x4012d0)
process("/usr/bin/sleep").statement(0x401200)
process("/usr/bin/sleep").statement(0x4012f0)
process("/usr/bin/sleep").statement(0x401260)
process("/usr/bin/sleep").statement(0x401200)
process("/usr/bin/sleep").statement(0x401300)
process("/usr/bin/sleep").statement(0x4014b0)
process("/usr/bin/sleep").statement(0x401240)
process("/usr/bin/sleep").statement(0x4013d0)
process("/usr/bin/sleep").statement(0x401420)
process("/usr/bin/sleep").statement(0x401420)
process("/usr/bin/sleep").statement(0x4013f0)
process("/usr/bin/sleep").statement(0x401270)
process("/usr/bin/sleep").statement(0x401240)
process("/usr/bin/sleep").statement(0x4013d0)
process("/usr/bin/sleep").statement(0x401420)
process("/usr/bin/sleep").statement(0x401420)
process("/usr/bin/sleep").statement(0x4013f0)
process("/usr/bin/sleep").statement(0x401270)
Pass 5: run completed in 10usr/30sys/1302real ms.
# stap --runtime=dyninst -ve 'probe process.plt {log(pp())}' -c 'sleep 1'
Pass 1: parsed user script and 46 library script(s) using
191168virt/9052res/3024shr/5892data kb, in 80usr/10sys/87real ms.
Pass 2: analyzed script: 53 probe(s), 2 function(s), 0 embed(s), 0 global(s)
using 191696virt/10048res/3588shr/6420data kb, in 10usr/0sys/9real ms.
Pass 3: using cached
/root/.systemtap/cache/00/stap_007ce3f23360c54bb366cc6c6111b57a_8322.c
Pass 4: using cached
/root/.systemtap/cache/00/stap_007ce3f23360c54bb366cc6c6111b57a_8322.so
Pass 5: starting run.
stapdyn: WARNING: Couldn't instrument the function containing 0x4011c0,
/usr/bin/sleep+0x11c0
stapdyn: WARNING: Couldn't instrument the function containing 0x4011d0,
/usr/bin/sleep+0x11d0
stapdyn: WARNING: Couldn't instrument the function containing 0x4011e0,
/usr/bin/sleep+0x11e0
stapdyn: WARNING: Couldn't instrument the function containing 0x4011f0,
/usr/bin/sleep+0x11f0
stapdyn: WARNING: Couldn't instrument the function containing 0x401200,
/usr/bin/sleep+0x1200
stapdyn: WARNING: Couldn't instrument the function containing 0x401210,
/usr/bin/sleep+0x1210
stapdyn: WARNING: Couldn't instrument the function containing 0x401220,
/usr/bin/sleep+0x1220
stapdyn: WARNING: Couldn't instrument the function containing 0x401230,
/usr/bin/sleep+0x1230
stapdyn: WARNING: Couldn't instrument the function containing 0x401240,
/usr/bin/sleep+0x1240
stapdyn: WARNING: Couldn't instrument the function containing 0x401250,
/usr/bin/sleep+0x1250
stapdyn: WARNING: Couldn't find an instrumentation point at 0x401260,
/usr/bin/sleep+0x1260
stapdyn: WARNING: Couldn't instrument the function containing 0x401270,
/usr/bin/sleep+0x1270
stapdyn: WARNING: Couldn't instrument the function containing 0x401280,
/usr/bin/sleep+0x1280
stapdyn: WARNING: Couldn't instrument the function containing 0x401290,
/usr/bin/sleep+0x1290
stapdyn: WARNING: Couldn't instrument the function containing 0x4012a0,
/usr/bin/sleep+0x12a0
stapdyn: WARNING: Couldn't instrument the function containing 0x4012b0,
/usr/bin/sleep+0x12b0
stapdyn: WARNING: Couldn't instrument the function containing 0x4012c0,
/usr/bin/sleep+0x12c0
stapdyn: WARNING: Couldn't instrument the function containing 0x4012d0,
/usr/bin/sleep+0x12d0
stapdyn: WARNING: Couldn't find an instrumentation point at 0x4012e0,
/usr/bin/sleep+0x12e0
stapdyn: WARNING: Couldn't instrument the function containing 0x4012f0,
/usr/bin/sleep+0x12f0
stapdyn: WARNING: Couldn't instrument the function containing 0x401300,
/usr/bin/sleep+0x1300
stapdyn: WARNING: Couldn't instrument the function containing 0x401310,
/usr/bin/sleep+0x1310
stapdyn: WARNING: Couldn't instrument the function containing 0x401320,
/usr/bin/sleep+0x1320
stapdyn: WARNING: Couldn't instrument the function containing 0x401330,
/usr/bin/sleep+0x1330
stapdyn: WARNING: Couldn't instrument the function containing 0x401340,
/usr/bin/sleep+0x1340
stapdyn: WARNING: Couldn't instrument the function containing 0x401350,
/usr/bin/sleep+0x1350
stapdyn: WARNING: Couldn't instrument the function containing 0x401360,
/usr/bin/sleep+0x1360
stapdyn: WARNING: Couldn't find an instrumentation point at 0x401370,
/usr/bin/sleep+0x1370
stapdyn: WARNING: Couldn't instrument the function containing 0x401380,
/usr/bin/sleep+0x1380
stapdyn: WARNING: Couldn't instrument the function containing 0x401390,
/usr/bin/sleep+0x1390
stapdyn: WARNING: Couldn't instrument the function containing 0x4013a0,
/usr/bin/sleep+0x13a0
stapdyn: WARNING: Couldn't instrument the function containing 0x4013b0,
/usr/bin/sleep+0x13b0
stapdyn: WARNING: Couldn't instrument the function containing 0x4013c0,
/usr/bin/sleep+0x13c0
stapdyn: WARNING: Couldn't instrument the function containing 0x4013d0,
/usr/bin/sleep+0x13d0
stapdyn: WARNING: Couldn't instrument the function containing 0x4013e0,
/usr/bin/sleep+0x13e0
stapdyn: WARNING: Couldn't find an instrumentation point at 0x4013f0,
/usr/bin/sleep+0x13f0
stapdyn: WARNING: Couldn't instrument the function containing 0x401400,
/usr/bin/sleep+0x1400
stapdyn: WARNING: Couldn't instrument the function containing 0x401410,
/usr/bin/sleep+0x1410
stapdyn: WARNING: Couldn't instrument the function containing 0x401420,
/usr/bin/sleep+0x1420
stapdyn: WARNING: Couldn't instrument the function containing 0x401430,
/usr/bin/sleep+0x1430
stapdyn: WARNING: Couldn't instrument the function containing 0x401440,
/usr/bin/sleep+0x1440
stapdyn: WARNING: Couldn't instrument the function containing 0x401450,
/usr/bin/sleep+0x1450
stapdyn: WARNING: Couldn't instrument the function containing 0x401460,
/usr/bin/sleep+0x1460
stapdyn: WARNING: Couldn't instrument the function containing 0x401470,
/usr/bin/sleep+0x1470
stapdyn: WARNING: Couldn't instrument the function containing 0x401480,
/usr/bin/sleep+0x1480
stapdyn: WARNING: Couldn't find an instrumentation point at 0x401490,
/usr/bin/sleep+0x1490
stapdyn: WARNING: Couldn't find an instrumentation point at 0x4014a0,
/usr/bin/sleep+0x14a0
stapdyn: WARNING: Couldn't instrument the function containing 0x4014b0,
/usr/bin/sleep+0x14b0
stapdyn: WARNING: Couldn't instrument the function containing 0x4014c0,
/usr/bin/sleep+0x14c0
stapdyn: WARNING: Couldn't instrument the function containing 0x4014d0,
/usr/bin/sleep+0x14d0
stapdyn: WARNING: Couldn't find an instrumentation point at 0x4014e0,
/usr/bin/sleep+0x14e0
stapdyn: WARNING: Couldn't find an instrumentation point at 0x4014f0,
/usr/bin/sleep+0x14f0
stapdyn: WARNING: Couldn't find an instrumentation point at 0x401500,
/usr/bin/sleep+0x1500
Pass 5: run completed in 3190usr/180sys/4382real ms.
#
=====

This observation originally comes from the process_by_pid testcase, where plt
probes are being hit 0 times.

Please, review.

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