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In-Reply-To: <20140930172125.GA2703@xvii.vinc17.org>
References: <20140930172125.GA2703@xvii.vinc17.org>
Date: Tue, 30 Sep 2014 16:18:43 -0700
Message-ID: <CAH+w=7aTw0r4RMwh=eg8jySMRsD-vrde8SuxF=Udek4iNQx8Fw@mail.gmail.com>
Subject: Re: zsh 5.0.6 hanged in freejob from TRAPCHLD
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh hackers list <zsh-workers@zsh.org>
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On Sep 30, 2014 10:30 AM, "Vincent Lefevre" <vincent@vinc17.net> wrote:
>
> I typed:
>
>   ps -aef|gr pulseaudio
>
> and zsh hanged.

The stack trace seems to indicate that the problem likely originates in
lexrestore() which calls free() directly (without the signal-safe zfree()
wrapper).  There's a corresponding problem in lexsave() with a direct call
to malloc().  The CHLD signal interrupts the free, leading to internal
deadlock when another free is called (correctly via zfree this time, though
it is optimized out of the backtrace).

This resembles the problems in execsave()/execrestore() that I fixed last
October.  I'll send a patch later if no one else gets there first.

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