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Infinite recursion makes bash segfault

From: Judicaël Courant
Subject: Infinite recursion makes bash segfault
Date: Thu, 5 May 2022 13:10:10 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1


I found bash segfaults when running into an infinite recursion (details below). I would expect it to either stop (or possibly exit) with a clear error message instead. Here are the details (as given by bashbug). The problem also happens with the latest bash version (5.2.0(1)-beta).


J. Courant.

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/bash-Smvct5/bash-5.0=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wno-parentheses -Wno-format-security uname output: Linux judicael-XPS-15-9500 5.13.0-40-generic #45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 17
Release Status: release

        Infinite recursion causes bash to segfault.
        The problem happens in interactive mode as well as in scripts.

        ~$ bash
        ~$ foo () { foo; }; foo
        Segmentation fault (core dumped)

Judicaël Courant
Software Engineer, TrustInSoft
(+33) (0)6 52 42 88 23

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