https://bugs.kde.org/show_bug.cgi?id=389373

            Bug ID: 389373
           Summary: exp-sgcheck fails with sg_instrument_IRStmt the
                    'impossible' happened
           Product: valgrind
           Version: 3.13.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: sgcheck
          Assignee: jsew...@acm.org
          Reporter: oli.hu...@gmail.com
  Target Milestone: ---

Created attachment 110094
  --> https://bugs.kde.org/attachment.cgi?id=110094&action=edit
exp-sgcheck verbose output

First of all, thanks for maintaining/developing valgrind, such a great tool!

I tried for the first time to use the sgcheck tool, but the tool cannot run my
(any?) executable. The error is 

exp-sgcheck: sg_main.c:2332 (sg_instrument_IRStmt): the 'impossible' happened.

This issue has been reported on the mailing-list earlier this months. Someone
gave instructions to provide more debugging info:

https://www.mail-archive.com/valgrind-users@lists.sourceforge.net/msg06477.html

I attached the output of the second command, that is

valgrind --tool=exp-sgcheck --trace-flags=11000000 --trace-notbelow=1564
/bin/ls


Some additional info:

$ uname -a
Linux fenchel 4.14.14-gentoo #1 SMP PREEMPT Sun Jan 21 17:22:28 CST 2018 x86_64
Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz GenuineIntel GNU/Linux

The binary have been compiled with gcc-7.2.0. The system is using glibc 2.26

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