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zsh segfault bug from 5.9.1-1 onwards

X-seq: zsh-workers 55064
From: Châu Trác Thịnh <234thinh275@xxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: zsh segfault bug from 5.9.1-1 onwards
Date: Fri, 7 Aug 2026 14:24:30 +0700
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I'm on Arch Linux, and a script of mine started to segfault after updating from 5.9-6 to 5.9.1-1.

Minimal reproduction: run the following

```

(echo 1 | cat & (echo 2))

```

There's no segfault when:

Reverting to 5.9-6
removing either of the parenthesis
removing any command in the chain (replacing them can still segfault; my original code is quite different)

Follow-Ups:
- Re: zsh segfault bug from 5.9.1-1 onwards
  - From: Mikael Magnusson

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