Public bug reported:
Bash hangs when extglobs with no patterns are specified.
Example:
$ echo !()
should print the contents of the current directory, but actually makes
bash hang with 100% CPU usage. Also affects other pattern types, e.g.
@() and ?(). Non-empty patterns work correctly.
After executing a command containing such a glob, a SIGKILL is required
to terminate the process.
Additional info:
$ lsb_release -rd
Description: Ubuntu 14.04.4 LTS
Release: 14.04
$ apt-cache policy bash
bash:
Installed: 4.3-7ubuntu1.5
Candidate: 4.3-7ubuntu1.5
Version table:
*** 4.3-7ubuntu1.5 0
500 http://mirrors.linode.com/ubuntu/ trusty-updates/main amd64 Packages
500 http://mirrors.linode.com/ubuntu/ trusty-security/main amd64
Packages
100 /var/lib/dpkg/status
4.3-6ubuntu1 0
500 http://mirrors.linode.com/ubuntu/ trusty/main amd64 Packages
** Affects: bash (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1683923
Title:
Empty extglob patterns hang bash
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