Red Hat Bugzilla – Bug 521134
Bash doesn't wait for backgrounded process if its PID is recycled
Last modified: 2018-10-20 00:12:54 EDT
The following condition occurs on RHEL4.8: [root@IT324086 ~]# uname -r ; rpm -q bash 2.6.9-89.0.9.EL bash-3.0-21.el4 [root@IT324086 ~]# echo 1000 > /proc/sys/kernel/pid_max # for example [root@IT324086 ~]# while true; do sleep 1d & done [1] 300 [2] 301 [3] 302 [4] 303 [5] 304 ... [696] 996 [697] 997 [698] 998 [699] 999 -bash: fork: Resource temporarily unavailable [root@IT324086 ~]# # kill some processes [root@IT324086 ~]# kill %1 [root@IT324086 ~]# kill %2 [1] Terminated sleep 1d [root@IT324086 ~]# man ps popen: Resource temporarily unavailable Attempt [/usr/bin/gunzip -c /usr/share/man/man1/ps.1.gz] to expand man page failed No manual entry for ps [2] Terminated sleep 1d [root@IT324086 ~]# ll [root@IT324086 ~]# ll total 88 -rw-r--r-- 1 root root 1068 Sep 3 15:03 anaconda-ks.cfg -rw-r--r-- 1 root root 65029 Sep 3 15:03 install.log -rw-r--r-- 1 root root 3062 Sep 3 15:03 install.log.syslog total 88 -rw-r--r-- 1 root root 1068 Sep 3 15:03 anaconda-ks.cfg -rw-r--r-- 1 root root 65029 Sep 3 15:03 install.log -rw-r--r-- 1 root root 3062 Sep 3 15:03 install.log.syslog This only happens for the current bash shell. Other bash shells running simultaneously respond fine.
It's fixed in bash-3.0-23.el4
Please be so kind and add a few key words to the technical note of this bugzilla entry using the following structure: Cause: Consequence: Fix: Result: For more details on CCFR texts, see: https://bugzilla.redhat.com/page.cgi?id=fields.html#cf_release_notes
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Cause Consequence: Fix: Result:
Technical note updated. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. Diffed Contents: @@ -1,7 +1,11 @@ -Cause +Cause: +Backgrounded process PID is the same as the previous backgrounded process PID. Consequence: +Bash doesn't wait for backgrounded process. Fix: +Force bash to forgot last backgrounded process PID. -Result:+Result: +Bash waits for backgrounded process.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0261.html