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Valgrind detects invalid read in bash. malloc assertion fails.

From: Johannes Müller
Subject: Valgrind detects invalid read in bash. malloc assertion fails.
Date: Tue, 30 Apr 2019 13:06:09 +0200
User-agent: Posteo Webmail

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -Wno-parentheses -Wno-format-security
uname output: Linux debian 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1 (2019-04-12) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 0
Release Status: release

When I run "valgrind bash valgrind_issue.sh" on my up-to-date Debian stretch, then valgrind shows invalid read errors and an assertion in malloc.c fails. At first, I observed this in the default bash & valgrind that ships with Debian: - bash --version: GNU bash, version 4.4.12(1)-release (x86_64-pc-linux-gnu)
        - valgrind --version:  valgrind-3.12.0.SVN
Then I reproduced it with the latest bash and valgrind (see attached log file): - bash --version: GNU bash, version 5.0.0(3)-release (x86_64-pc-linux-gnu)
        - valgrind --version:  valgrind-3.15.0
        The problem does not reproduce on my RHEL 7.6.
It also reproduces on my second Debian stretch. The content of valgrind_issue.sh:
        for aFile in *; do
            echo "aFile=$aFile"

        - Log into a Debian stretch
        - Execute: valgrind bash valgrind_issue.sh


Attachment: bash_valgrind_issue.zip
Description: Zip archive

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