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Date:      Fri, 17 Mar 1995 17:57:03 +1000
From:      Bruce Evans <bde@zeta.org.au>
To:        davidg@Root.COM, mark@grondar.za, roberto@blaise.ibp.fr
Cc:        bugs@FreeBSD.org, current@FreeBSD.org
Subject:   Re: Mysterious hang-type thingy...
Message-ID:  <199503170757.RAA11643@godzilla.zeta.org.au>

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>> While doing a make install, the session concerned just _stops_. No ^c's
>> or ^Z's can stop it. "w" On any other session dies in a similar way.
>> 
>> The only way I have recovered the machine is to reboot (shutdown -r does
>> the trick). I have not tried very hard to isolate this.

>Nice to see I'm not the only one :-) and :-(

Perhaps this is the same bug that I worked around the other day.  /etc/rc
started hanging for the `[' process.  The ddb inbuilt command `ps' said
that `[' was waiting in on the channel `objde1'.  ps's formatting isn't
good so this looked like a bug in the formatting, but there really is a
channel `objde1'.  I think the hang is when `[' tries to exit.  /etc/rc
executes a whole lot of `['s without executing any other processes.  My
/bin/[ is special in being linked shared (like all the other executables
in my /bin and /sbin).  The hang only occurred on about 90% of boots.  I
worked around the problem by replacing /bin/[ by one linked statically.

`make install' is a bit like /etc/rc in that it often runs the same
small process many times in a row.

Bruce



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