[Bug translator/22008] New: missing rt_sigreturn return probe hits

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

https://sourceware.org/bugzilla/show_bug.cgi?id=22008

            Bug ID: 22008
           Summary: missing rt_sigreturn return probe hits
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

On RHEL7 aarch64 (4.5.0-15.4.2.el7.aarch64), I'm seeing the following:

====
# gcc  ../src/testsuite/systemtap.syscall/rt_signal.c -o rt_signal
# stap -e 'probe kprobe.function("sys_rt_sigreturn").return {
printf("return\n") }' -c ./rt_signal
return
return
return
return
# stap -e 'probe kernel.function("sys_rt_sigreturn").return {
printf("return\n") }' -c ./rt_signal
#
====

For some reason we're missing the rt_sigreturn return probe hits with
dwarf-based kprobes. Note that I'm also seeing this on
4.12.5-300.fc26.i686+PAE.

Also note that I'm not seeing this with the pre-bpf code, and the probe address
appears to be the same between the post-bpf and pre-bpf code.

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