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[Bug binutils/28516] New: Error message produced by Objdump changed per


From: shaohua.li at inf dot ethz.ch
Subject: [Bug binutils/28516] New: Error message produced by Objdump changed per run
Date: Fri, 29 Oct 2021 10:03:24 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=28516

            Bug ID: 28516
           Summary: Error message produced by Objdump changed per run
           Product: binutils
           Version: 2.38 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

Created attachment 13743
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13743&action=edit
diff.o

Hi,

For some inputs, `objdump` would threw out inconsistent error info per run. 

- Compiler: clang13 / gcc11

- Reproduce: run `objdump -S diff.o` and check the value of ` DWARF error:
offset (xxxx)`, which would change per run.

I did some analysis and found that the function read_indexed_string:dwarf.c
changed the value of attr->u.val passed from dwarf.c:1291 unexpectly.

A related issue report is https://sourceware.org/bugzilla/show_bug.cgi?id=27874

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