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Mon, 02 Jan 2023 07:14:03 -0800 (PST) Received: from smtpclient.apple ([76.152.217.20]) by smtp.gmail.com with ESMTPSA id b6-20020ac86786000000b003a50b9f099esm17489639qtp.12.2023.01.02.07.14.01 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 02 Jan 2023 07:14:02 -0800 (PST) From: Jacob Greenfield Content-Type: multipart/alternative; boundary="Apple-Mail=_62128AD7-9280-491E-88F6-C2CE16E9176C" Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.300.101.1.3\)) Subject: Zsh 5.9 segfault, likely due to unsafe signal handler Message-Id: <3A4C1EA2-76F7-432D-9D61-FD1D86129546@gmail.com> Date: Mon, 2 Jan 2023 10:13:38 -0500 To: zsh-workers@zsh.org X-Mailer: Apple Mail (2.3731.300.101.1.3) X-Seq: 51271 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: --Apple-Mail=_62128AD7-9280-491E-88F6-C2CE16E9176C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hello, I am using zsh 5.9 (ARM64) via Homebrew on macOS 13.1 and I ran into a = segfault as I was exiting a manpage. Unfortunately I can't seem to = reproduce it, but I'm attaching the crash log to this email. I'm not very familiar with zsh's source but after a quick look, I = noticed that `zhandler` calls `wait_for_processes`, which really doesn't = seem to be async-signal-safe = . For example it reads = from the global variable `cmdoutpid` which is just a `pid_t` rather than = a `volatile sig_atomic_t` or a lock-free atomic; since it's a regular, = static, non-volatile, non-atomic variable, reading it from a signal = handler could lead to a data race and other UB. It makes sense that this = issue would be difficult to reproduce, and that it would appear more = easily on Apple Silicon which has extremely out-of-order execution that = tends to trigger latent memory bugs like this. Happy New Year! Hope this helps. Best, Jacob Greenfield =EF=BF=BC= --Apple-Mail=_62128AD7-9280-491E-88F6-C2CE16E9176C Content-Type: multipart/mixed; boundary="Apple-Mail=_EDE68AAD-C510-4D45-A20E-F79643292678" --Apple-Mail=_EDE68AAD-C510-4D45-A20E-F79643292678 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hello,

I am using zsh 5.9 (ARM64) = via Homebrew on macOS 13.1 and I ran into a segfault as I was exiting a = manpage. Unfortunately I can't seem to reproduce it, but I'm attaching = the crash log to this email.




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