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Re: malloc: ../bash-5.2.21/dispose_cmd.c:249: assertion botched


From: Dennis Clarke
Subject: Re: malloc: ../bash-5.2.21/dispose_cmd.c:249: assertion botched
Date: Mon, 4 Mar 2024 13:06:33 -0500
User-agent: Mozilla Thunderbird

On 3/4/24 12:05, Chet Ramey wrote:
On 2/29/24 12:11 PM, Dennis Clarke via Bug reports for the GNU Bourne Again SHell wrote:

Well this has me a bit baffled.

I downloaded the bash source tarball for 5.2.21 and then applied the few patches to get me to :

io$
io$ which bash
/opt/bw/bin/bash
io$ bash --version
GNU bash, version 5.2.26(1)-release (armv7l-unknown-linux-gnueabihf)
Copyright (C) 2022 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.
io$

I then did a configure for a very stripped down shell :

configure --prefix=/opt/bw --enable-minimal-config \
 > --enable-history --enable-strict-posix-default \
 > --enable-threads=posix --with-curses --with-gnu-ld

This is a pretty darn minimal config there.

When I try to use that shell ( for just about anything ) I get this
message very often :

malloc: ../bash-5.2.21/dispose_cmd.c:249: assertion botched
free: called with already freed block argument

I can't reproduce this on a generic RHEL system using this configuration,
but that's probably not close enough to what you're using.

You're running the release version, so you don't have any bash malloc
debugging, but you could rebuild a version with valgrind:

make clean
make valgrind

(this basically removes all the malloc wrappers bash uses to give you
the file and line number information you saw).

Then see what it tells you.

It might be something as simple as using an old version of bison, for
example.


Firstly, and this needs to be said, thank you for the reply. I was
wondering if the mail list had fallen silent but clearly we are alive
and well! Thank you.

The bison version is a bit older but not crusty and dusty :

io$ bison --version
bison (GNU Bison) 3.3.2
Written by Robert Corbett and Richard Stallman.

Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
io$

What I shall do is look at the dependency tree for bison 3.8.2 and build
everything from bottom to top. Then get into a valgrind build and see
what happens. Good advice. Thank you. Half of the problem is that the
hardware is weird! Not sure who else bothers with 32-bit armv7l but my
guess is that it is mostly in the embedded world.

I'll get to work on that and let you know.



--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken




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