[Bug libdw/21602] New: dwfl_addrmodule reports bogus modules for unmapped areas

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21602

            Bug ID: 21602
           Summary: dwfl_addrmodule reports bogus modules for unmapped
                    areas
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

LD_LIBRARY_PATH=./libdw/ ./src/addr2line -p $p 0x7f7d33043000

Actual:
insert: 0x55be1a359000..0x55be1a561000 i=0 segndx=-1 need_start=1 need_end=1
insert: 0x7f7d2c0e7000..0x7f7d32c80000 i=2 segndx=-1 need_start=1 need_end=1
insert: 0x7f7d33046000..0x7f7d3326d000 i=4 segndx=-1 need_start=1 need_end=1
insert: 0x7ffdcf1bc000..0x7ffdcf1be000 i=6 segndx=-1 need_start=1 need_end=1
0x7f7d33043000 -> /usr/lib64/libc-2.24.so
??:0

Expected:
0x7f7d33043000 -> null
??:0

reify_segments() seems to do something wrong.  That lookup_addr array seems to
be wrongly built.


55be1a359000-55be1a360000 r-xp 00000000 fd:00 13636393                  
/usr/bin/sleep
55be1a55f000-55be1a560000 r--p 00006000 fd:00 13636393                  
/usr/bin/sleep
55be1a560000-55be1a561000 rw-p 00007000 fd:00 13636393                  
/usr/bin/sleep
55be1be9b000-55be1bebc000 rw-p 00000000 00:00 0                          [heap]
7f7d2c0e7000-7f7d32c80000 r--p 00000000 fd:00 13651402                  
/usr/lib/locale/locale-archive
7f7d32c80000-7f7d32e3d000 r-xp 00000000 fd:00 13632051                  
/usr/lib64/libc-2.24.so
7f7d32e3d000-7f7d3303c000 ---p 001bd000 fd:00 13632051                  
/usr/lib64/libc-2.24.so
7f7d3303c000-7f7d33040000 r--p 001bc000 fd:00 13632051                  
/usr/lib64/libc-2.24.so
7f7d33040000-7f7d33042000 rw-p 001c0000 fd:00 13632051                  
/usr/lib64/libc-2.24.so
7f7d33042000-7f7d33046000 rw-p 00000000 00:00 0 
^^^ 0x7f7d33043000 belongs here with no mapped file
7f7d33046000-7f7d3306b000 r-xp 00000000 fd:00 13632665                  
/usr/lib64/ld-2.24.so
7f7d3323d000-7f7d3323f000 rw-p 00000000 00:00 0 
7f7d33269000-7f7d3326b000 rw-p 00000000 00:00 0 
7f7d3326b000-7f7d3326c000 r--p 00025000 fd:00 13632665                  
/usr/lib64/ld-2.24.so
7f7d3326c000-7f7d3326d000 rw-p 00026000 fd:00 13632665                  
/usr/lib64/ld-2.24.so

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