Your message dated Fri, 16 Dec 2022 17:52:15 +0100
with message-id <[email protected]>
and subject line Re: Bug#782540: dash: wait returns whenever a child process is
stopped/continued
has caused the Debian Bug report #782540,
regarding dash: wait returns whenever a child process is stopped/continued
to be marked as done.
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Bug report if necessary, and/or fix the problem forthwith.
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--
782540: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782540
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: dash
Version: 0.5.7-4+b1
Severity: normal
Control: affects -1 mysql-server-5.5
The wait builtin apparently returns immediately upon SIGCHLD, which
means it will return prematurely if a child is stopped or continued:
set +m
sleep 1000 &
wait
# This will return immediately if SIGSTOP is sent to the sleep process
wait
# This will return immediately if SIGCONT is sent to the sleep process
This "cmd & wait" pattern notably appears in the Debian version of
mysqld_safe (as a fix for #527623). Combined with a VPS that throttles
CPU usage via SIGSTOP/SIGCONT, this resulted in lots of hair-pulling on
my part.
-- System Information:
Debian Release: 8.0
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (x86_64)
Foreign Architectures: amd64
Kernel: Linux 3.16.0-4-amd64 (SMP w/3 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages dash depends on:
ii debianutils 4.4+b1
ii dpkg 1.17.25
ii libc6 2.19-17
dash recommends no packages.
dash suggests no packages.
-- debconf information excluded
--- End Message ---
--- Begin Message ---
Package: dash
Version: 0.5.11+git20200708+dd9ef66-1
As Herbert noted above, this is fixed in 0.5.11, and I can confirm this
bisecting on snapshot.d.o: 0.5.10.2-7 is the last bad version.
In bisecting on the git repository, commit
6c691b3e5099de380a9d2f97d5c72f4a978bb794 ("jobs: Only clear gotsigchld
when waiting for everything") is the first good one.
наб
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--- End Message ---
