[lldb-dev] [Bug 18734] New: symbol lookup of bss variable in shared library does not match assembly

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Feb 4 23:34:23 PST 2014


            Bug ID: 18734
           Summary: symbol lookup of bss variable in shared library does
                    not match assembly
           Product: lldb
           Version: 3.3
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: harry.weppner at gmx.net
    Classification: Unclassified


I stumbled across a situation where the symbol lookup seems inconsistent.

The gist of the issue is described at

In line https://gist.github.com/HarryWeppner/946cac154d769cf6936c#file-lldb-L14
lldb prints that the address of variable 'a' is 0x800a1b820 within libbss.so.1
(the shared library created from mylib.c).

That value shows as 0 even after being set to 1, i.e. the expression a == i
(https://gist.github.com/HarryWeppner/946cac154d769cf6936c#file-lldb-L24) is
false . However, the printout in line
https://gist.github.com/HarryWeppner/946cac154d769cf6936c#file-lldb-L28 is ok
again and shows 'a' with a value of 1.

The fact that lldb *and* gdb show this behavior may indicate that the root
cause is actually a backend bug but I've filed this bug here since the symptom
occurs in lldb.

Thanks & cheerio, Harry.

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