https://sourceware.org/bugzilla/show_bug.cgi?id=22776
Bug ID: 22776
Summary: internal error in dwarf_reader.cc
Product: binutils
Version: 2.29
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: evstupac at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
Created attachment 10777
--> https://sourceware.org/bugzilla/attachment.cgi?id=10777&action=edit
bad (causing internal error) object file
To reproduce:
ld.gold test_bad.o /usr/lib64/libc.so.6
ld.gold: internal error in format_file_lineno, at
../../binutils-2.29/gold/dwarf_reader.cc:2249
libc I use: 2.7 compiled by GNU CC version 4.8.5 20150623 (Red Hat 4.8.5-16) on
a Linux 3.10.0 system on 2017-06-16
The error was triggered by switching dwarf version from 2 to 4 in llvm compiler
(svn r319699 or git a61e335ed0ae118bf3ce579c9b33ea277463bff0).
Attached good and bad object files (for Linux) and corresponding readelf.
There is only 2 bytes difference between .debug_line sections there. The one
that triggers linker internal error is:
0406 instead of 0306
gold linker reads first symbol (04 in bad case) as elfcpp::DW_LNS_set_file
(dwarf_reader.cc line 1819)
and as elfcpp::DW_LNS_advance_line in good case (03).
The debug information is only for 5 files in the test. An attempt to access
6th file causes internal error.
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