Fixes have been pushed to cosmic-proposed and bionic-proposed.
** Summary changed:
- Apply Bash 4.4.20 to fix cpu spinning on built-in wait
+ [SRU] Apply Bash 4.4.20 to fix cpu spinning on built-in wait
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** Merge proposal linked:
https://code.launchpad.net/~bryce/ubuntu/+source/bash/+git/bash/+merge/368573
** Merge proposal linked:
https://code.launchpad.net/~bryce/ubuntu/+source/bash/+git/bash/+merge/368574
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** Description changed:
[Impact]
Long running bash loops that create and reap processes will crash,
hanging at 100% CPU.
+ [Test Case]
- [Test Case]
+ A PPA with the proposed fix included is at:
+
+ https://launchpad.net/~bryce/+archive/ubuntu/bash-sru-19-010-1
+
+ Install the
** Changed in: bash (Ubuntu Bionic)
Status: New => In Progress
** Changed in: bash (Ubuntu Cosmic)
Status: New => In Progress
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** Tags removed: rls-bb-incoming
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https://bugs.launchpad.net/bugs/1822776
Title:
Apply Bash 4.4.20 to fix cpu spinning on built-in wait
Status in bash package
** Changed in: bash (Ubuntu Cosmic)
Importance: Undecided => High
** Changed in: bash (Ubuntu Cosmic)
Assignee: (unassigned) => Bryce Harrington (bryce)
** Changed in: bash (Ubuntu)
Status: New => Fix Released
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Thanks; it's not about getting it done yesterday so to speak, so I'll
patiently await next week.
I suspect you'll be able to reproduce it faster if you lower sysctl
kernel.pid_max. With 32k PIDs, one of my apps spawning about a process
every two seconds, needed about a week of running to hit it.
Hi halfgaar,
Robie asked me to help you with this bug, thanks for reporting it. I
may not be able to get full attention on this until next week due to a
project deadline, but I've had a quick look at the patch and your
problem description, and it looks pretty straightforward. Thanks also
for
** Description changed:
- Bash pre-4.4.20 has a bug in its PID hash table that causes spin-loops
- when spawning sub processes and waiting for them. There is a fix:
+ [Impact]
- https://ftp.gnu.org/gnu/bash/bash-4.4-patches/bash44-020
+ Long running bash loops that create and reap processes
** Also affects: bash (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: bash (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: bash (Ubuntu Bionic)
Assignee: (unassigned) => Bryce Harrington (bryce)
** Also affects: bash (Ubuntu Cosmic)
Importance:
** Tags added: bitesize server-next
** Changed in: bash (Ubuntu)
Assignee: (unassigned) => Bryce Harrington (bryce)
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https://bugs.launchpad.net/bugs/1822776
** Changed in: bash (Ubuntu)
Importance: Undecided => High
** Tags added: rls-bb-incoming
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https://bugs.launchpad.net/bugs/1822776
Title:
Apply Bash 4.4.20
I added more info (edited the original description) hoping it covers
everything the SRU requires.
** Description changed:
Bash pre-4.4.20 has a bug in its PID hash table that causes spin-loops
when spawning sub processes and waiting for them. There is a fix:
Thank you for taking the time to report this bug and helping to make
Ubuntu better.
Please see https://wiki.ubuntu.com/StableReleaseUpdates for details of
Ubuntu's stable release update process. Based on your report it sounds
like this patch would qualify, but please could you update us on the
I see this bug hasn't gotten attention, but isn't this quite critical?
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https://bugs.launchpad.net/bugs/1822776
Title:
Apply Bash 4.4.20 to fix cpu spinning on
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