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From: "nilsgladitz at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/26828] New: SIGSEGV in follow_die_offset dwarf2/read.c:22950
Date: Mon, 02 Nov 2020 10:42:52 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26828

            Bug ID: 26828
           Summary: SIGSEGV in follow_die_offset dwarf2/read.c:22950
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: nilsgladitz at gmail dot com
  Target Milestone: ---

I am running GDB 10.1 on x86_64 GNU/Linux targeting ARM.

While debugging a core file with "-i=3Dmi" and repeatedly running e.g.
"-stack-list-variables --thread 1 --frame 0 --simple-values" results in a
segmentation fault.

The first call returns "frame" and "variables" information.
The second call returns just the "variables".
The third call segfaults in "follow_die_offset" (dwarf2/read.c:22950).

The segfaulting line reads:
   target_cu->ancestor =3D cu;

target_cu is apparently 0.

I can reproduce the issue with current master
(e1f57067b162cba9f39e087726c7a2f2cfaae96f) too.

With GDB 9.1 the third (and subsequent) calls don't seem to segfault.

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