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Re: sendmail function probe registration error with systemtap


Dear Frank,

I am very glad that you can help. I am not familiar with perf probe,
and thank you for your kindness to help us.

I am running Fedora 19 with the latest kernel in the repository. I
installed sendmail from the official repository as well as debug-info
for glibc and coreutils. sendmail is tested working properly without
systemtap tracing scripts. We are doing experiments tracing function
calls of sendmail using trace.stp I provide in my first email.

# yum list installed | grep sendmail
sendmail.i686                         8.14.7-1.fc19                     @fedora
sendmail-cf.noarch                    8.14.7-1.fc19                     @fedora
sendmail-debuginfo.i686               8.14.7-1.fc19
 @fedora-debuginfo
sendmail-devel.i686                   8.14.7-1.fc19                     @fedora
sendmail-milter.i686                  8.14.7-1.fc19                     @fedora

# yum list installed | grep glibc
glibc.i686                            2.17-20.fc19                      @updates
glibc-common.i686                     2.17-20.fc19                      @updates
glibc-debuginfo.i686                  2.17-20.fc19
 @updates-debuginfo
glibc-debuginfo-common.i686           2.17-20.fc19
 @updates-debuginfo
glibc-devel.i686                      2.17-20.fc19                      @updates
glibc-headers.i686                    2.17-20.fc19                      @updates

# yum list installed | grep coreutils
coreutils.i686                        8.21-11.fc19                      @fedora
coreutils-debuginfo.i686              8.21-11.fc19
 @fedora-debuginfo
policycoreutils.i686                  2.1.14-46.6.fc19                  @updates


Best,
Xiaokui

On Fri, Jan 10, 2014 at 4:15 PM, Frank Ch. Eigler <fche@redhat.com> wrote:
> On Fri, Jan 10, 2014 at 03:26:09PM -0500, Xiaokui Shu wrote:
>> I find nothing changed with -DSTP_ALIBI. It does not stop sendmail
>> from not receiving emails. Do you suggest this is a uprobe problem
>> instead of systemtap?
>
> Yup, high likelihood.
>
>> The command I run stap is:
>> #stap -DSTP_ALIBI -o sendmail.trace -v trace.stp sendmail
>
>> == stap -V ==
>> Systemtap translator/driver (version 2.4/0.156, rpm 2.4-1.fc19)
>> [...]
>> == dmesg | fgrep 'Linux version' ==
>> [    0.000000] Linux version 3.12.6-200.fc19.i686.PAE
>> (mockbuild@bkernel02) (gcc version 4.8.2 20131212 (Red Hat 4.8.2-7)
>> (GCC) ) #1 SMP Mon Dec 23 16:58:40 UTC 2013
>> [...]
>
> Thanks a lot.  So it's a nice recent kernel & systemtap combination.
>
> One way to proceed further is to try to reproduce the problem with
> "perf probe" rather than systemtap.  For that, one might run "stap -k
> ..." to preserve the C intermediate code to fish out the low-level
> probe addresses, arrange to feed the same set to perf-probe, then
> activate them on a copy of sendmail, and see if it flies.  In case
> it doesn't, it's time to file a kernel bugzilla entry.
>
> We can help with this part, but would need e.g. the generated .c file
> and the exact rpm version of your sendmail.
>
>
> - FChE


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