[Bug symtab/25678] New: gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[Bug symtab/25678] New: gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[klkblake at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

            Bug ID: 25678
           Summary: gdb crashes with "internal-error: sect_index_text not
                    initialized" when .text missing and >2 segments
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: klkblake at gmail dot com
  Target Milestone: ---

Created attachment 12379
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12379&action=edit
testcase for sect_index_text crash

When loading a shared library that has no .text section, and does not have
either 1 or 2 segments, gdb will fail with "internal-error: sect_index_text not
initialized". I've attached a minimal testcase.

$ cat >test.c <<EOF
int main() {}
EOF
$ gcc test.c ./libtestcase.so
$ gdb ./a.out
... <snip> ...
GNU gdb (GDB) 10.0.50.20200307-git
... <snip> ...
Reading symbols from ./a.out...
(gdb) r
Starting program: /tmp/a.out 
../../gdb/objfiles.h:524: internal-error: sect_index_text not initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[thravran.qathy at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Qathy <thravran.qathy at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thravran.qathy at gmail dot com

--- Comment #1 from Qathy <thravran.qathy at gmail dot com> ---
Hello,

Using gdb 7.12.1, I'm currently experiencing a very similar issue, if not
exactly the same.
You'll find attached a stack obtained from the core generated by gdb at its
request on experiencing the following issue.

Reading symbols from
/usr/tmp_people/lps/tinony/dev/tina_lps42/Lib/libXm.so.4...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/libXt.so.6...(no debugging
symbols found)...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/libX11.so.6...(no debugging
symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...(no debugging
symbols found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Reading symbols from /lib/x86_64-linux-gnu/libcrypt.so.1...(no debugging
symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...(no debugging symbols
found)...done.
Reading symbols from
/usr/tmp_people/lps/tinony/dev/tina_lps42/Lib/libicuuc.so.64...(no debugging
symbols found)...done.
Reading symbols from
/usr/tmp_people/lps/tinony/dev/tina_lps42/Lib/libicudata.so.64...../../gdb-7.12.1/gdb/symfile.c:969:
internal-error: sect_index_text not initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

../../gdb-7.12.1/gdb/symfile.c:969: internal-error: sect_index_text not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Command aborted.
(gdb) q
A debugging session is active.

        Inferior 1 [process 27615] will be detached.

Quit anyway? (y or n) y

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[thravran.qathy at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

--- Comment #2 from Qathy <thravran.qathy at gmail dot com> ---
Created attachment 12421
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12421&action=edit
Stack of gdb when encountering the issue

This file contains the stack obtained from the core which was produced by gdb
when it encountered the "internal-error: sect_index_text not initialized"

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[keiths at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
            Version|unknown                     |HEAD
                 CC|                            |keiths at redhat dot com
   Last reconfirmed|                            |2020-04-02

--- Comment #3 from Keith Seitz <keiths at redhat dot com> ---
I can confirm that this still happens on HEAD:

$ ./gdb 25678 -ex r
GNU gdb (GDB) 10.0.50.20200318-git
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from 25678...
(No debugging symbols found in 25678)
Starting program: /home/keiths/tmp/25678 
../../src/gdb/objfiles.h:524: internal-error: sect_index_text not initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[thravran.qathy at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

--- Comment #4 from Qathy <thravran.qathy at gmail dot com> ---
As of now, and up to what I can understand, this issue seams to be triggered by
libicudata.so.64, as with *very* similar source code using libicudata.so.59 I
don't experience the issue.

Fortunately enough, I may revert to this previous version for the sake of my
current most urgent issue.

But for some of our new features, this revert sounds a bit more tricky and
we're eager to obtaining a gdb version compatible with libicudata.so.64

Thanks in advance.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[mlimber at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

mlimber at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mlimber at gmail dot com

--- Comment #5 from mlimber at gmail dot com ---
Created attachment 12535
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12535&action=edit
Proposed patch to fix the problem

>From patch by Jeremie Courreges-Anglas:
https://marc.info/?l=openbsd-ports&m=146569238229407&w=2

Needs a test case.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[simark at simark dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simark at simark dot ca

--- Comment #6 from Simon Marchi <simark at simark dot ca> ---
To reproduce this on Ubuntu, I needed -Wl,--no-as-needed.  Otherwise, the
executable wouldn't be linked with libtestcase.so.

$ gcc test.c -Wl,--no-as-needed ./libtestcase.so -g3 -O0

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[slyfox at inbox dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Sergei Trofimovich <slyfox at inbox dot ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |slyfox at inbox dot ru

--- Comment #7 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Also reported in Gentoo as https://bugs.gentoo.org/724614

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[slyfox at inbox dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

--- Comment #8 from Sergei Trofimovich <slyfox at inbox dot ru> ---
On gdb-9.2 test case from #comment1 fails as:

"""
$ x86_64-pc-linux-gnu-gcc test.c ./libtestcase.so
$ gdb --quiet ./a.out
Reading symbols from ./a.out...
(gdb) r
Starting program: /tmp/a.out
../../gdb-9.2/gdb/dwarf2read.c:8080: internal-error: sect_index_text not
initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
"""

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[cebtenzzre at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Cebtenzzre <cebtenzzre at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cebtenzzre at gmail dot com

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[cebtenzzre at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

--- Comment #9 from Cebtenzzre <cebtenzzre at gmail dot com> ---
I'm using GDB 9.2 on Arch Linux. I ran into this issue today
("../../gdb/symfile.c:886: internal-error: sect_index_text not initialized")
and I can confirm that the proposed patch works for me. But the testcase fails
with or without the patch.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[simark at simark dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

--- Comment #10 from Simon Marchi <simark at simark dot ca> ---
I had kind of forgotten about this issue, thanks for bringing it up again.

I did send this RFC in May to ask for opinions on how we should address the
issue:

https://sourceware.org/pipermail/gdb-patches/2020-May/168767.html

There was no answer, but I'll take another look and see if I can propose an
actual patch.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[napth at protonmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Napth <napth at protonmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |napth at protonmail dot com

--- Comment #11 from Napth <napth at protonmail dot com> ---
Hi

Also using gdb 9.2, the fix proposed by Jeremie Courreges-Anglas liked in
comment 5 works for my case. 

But before testing on gdb 9.2, I tried on gdb 8.3.1 and after double checking,
for my case the fix doesn't work.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[jreiser at BitWagon dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

John Reiser <jreiser at BitWagon dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jreiser at BitWagon dot com

--- Comment #12 from John Reiser <jreiser at BitWagon dot com> ---
I see this when I dlopen() a shared library that has (Elf64_Ehdr.e_shnum == 0)
:
=====
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git

/build/gdb-MVZsgD/gdb-10.1/gdb/symfile.c:878: internal-error: sect_index_text
not initialized
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n)
=====

Relying on the current libbfd, which looks only at ElfXX_Shdr (and not at
ElfXX_Phdr{PT_DYNAMIC}), is not adequate when debugging execution.  Neither the
operating system {Linux kernel), nor the run-time dynamic linker (rtld or
ld-linux.so} pays any attention to ElfXX_Shdr.  Instead, execution is
controlled entirely by the ElfXX_Phdr.  In particular, the PT_DYNAMIC segment
with its entries for PT_SYMTAB, PT_STRTAB, PT_GNU_HASH, PT_VERSYM, PT_VERNEED
contain the same information that the SHT_DYNSYM, SHT_STRTAB, SHT_GNU_HASH,
SHT_VERSYM, SHT_VERNEED sections may have once contained.  So if ElfXX_Shdr
cannot be found or do not look right, then libbfd and/or gdb should consult the
ELFXX_Phdr{PT_DYNAMIC}.

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[dilfridge at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Andreas K. Huettel <dilfridge at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dilfridge at gentoo dot org

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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[Bug symtab/25678] gdb crashes with "internal-error: sect_index_text not initialized" when .text missing and >2 segments

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25678

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.gentoo.org/sho
                   |                            |w_bug.cgi?id=724614

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