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Message-ID: <19471652a7a.50e9fe137311.5385327542827515244@zohomail.com>
Date: Fri, 17 Jan 2025 03:14:03 +0400
From: Askar Safin <safinaskar@...omail.com>
To: "musl" <musl@...ts.openwall.com>
Subject: [bug] Ctrl-Z when process is doing posix_spawn makes the process
hard to kill
I found a bug both in glibc and musl.
If a process does posix_spawn+waitpid, then attempting to pause it using Ctrl-Z
sometimes doesn't work and, worse, makes the process unkillable by usual Ctrl-Z or Ctrl-C.
The bug is described in full in this glibc issue: https://sourceware.org/bugzilla/show_bug.cgi?id=32565 .
It is reproducible with musl on the same system I used to reproduce it with glibc (see the link).
I compiled the code using "x86_64-linux-musl-gcc" wrapper provided by Debian.
Please, CC me when replying.
Output of some commands:
# dpkg -l musl
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii musl:amd64 1.2.5-1.1 amd64 standard C library
# /lib/x86_64-linux-musl/libc.so
musl libc (x86_64)
Version 1.2.5
Dynamic Program Loader
Usage: /lib/x86_64-linux-musl/libc.so [options] [--] pathname [args]
--
Askar Safin
https://types.pl/@safinaskar
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