[Bug uprobes/18340] Segmentation fault of probed SSHD program

["fahadaliarshad at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18340

--- Comment #4 from fahadaliarshad at gmail dot com ---
Frank,
Thanks for providing feedback on this.

I was going to build from source a kernel version > 3.13. But before that, I
updated my system (yum update) and kernel version updated from
"3.10.0-123.9.3.el7.x86_64" to the latest version "3.10.0-229.1.2.el7.x86_64"
available by Centos7 repo.

Apparently, this fixed the issue!

I am still not sure what was the root-cause though.

There is no segfault anymore but I do see a "WARNING: function _start return"
as below.

[root@centos7 ~]# stap -v -e 'probe
process("/usr/local/openssh-5.3p1/sbin/sshd").function("*") {printf("[%d]
funcname:%s->\n", gettimeofday_us(), pp())} probe
process("/usr/local/openssh-5.3p1/sbin/sshd").function("*").return
{printf("[%d] funcname:%s<-\n", gettimeofday_us(), pp())}'
Pass 1: parsed user script and 106 library script(s) using
217156virt/34680res/2992shr/32188data kb, in 220usr/60sys/288real ms.
WARNING: function _start return probe is blacklisted: keyword at <input>:1:131
 source: probe process("/usr/local/openssh-5.3p1/sbin/sshd").function("*")
{printf("[%d] funcname:%s->\n", gettimeofday_us(), pp())} probe
process("/usr/local/openssh-5.3p1/sbin/sshd").function("*").return
{printf("[%d] funcname:%s<-\n", gettimeofday_us(), pp())}
                                                                               
                                                           ^
Pass 2: analyzed script: 1982 probe(s), 3 function(s), 1 embed(s), 0 global(s)
using 225440virt/43964res/3732shr/40472data kb, in 180usr/20sys/183real ms.
Pass 3: using cached
/root/.systemtap/cache/a6/stap_a6c26ef9098b1d31ec5d9d07d982715b_652697.c
Pass 4: using cached
/root/.systemtap/cache/a6/stap_a6c26ef9098b1d31ec5d9d07d982715b_652697.ko
Pass 5: starting run.

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