https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218598
Bug ID: 218598
Summary: pwait deadlocks on its own pid
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 181726
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181726&action=edit
Patch to not wait on our own pid.
pwait will deadlock when passed its own PID. I experienced this when
kern.randompid was set with poudriere. The code was more or less this:
#!/bin/sh
do_the_thing&
pwait $!
do_the_other_thing
if do_the_thing ends before pwait starts, and do_the_thing and pwait get the
same pid, pwait waits indefinitely.
I've attached a patch to warn and exit immediately if pwait is told to wait on
its own pid.
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