[Xquartz-dev] xterm infinite loop at shell exit in 2.7.2_rc3

[Jeremy Huddleston]

http://xquartz.macosforge.org/trac/ticket/557

On May 27, 2012, at 14:35, Tom Lane <tgl at sss.pgh.pa.us> wrote:

> I just observed a case of $SUBJECT: I typed control-D to end a shell
> session, and bash replied with "Exit", but the xterm window didn't
> close as it normally does.  What's more, clicking on the red
> window-close button did nothing, which seemed even more surprising.
> I looked closer, and found:
> 
> 1. According to ps, that xterm instance was chewing 100% CPU.  Its
> child process was still there, too, but listed as "(bash)", which
> I think means it was a zombie.  So this suggests a failure to respond
> to SIGCHLD properly.
> 
> 2. I tried to attach to the process with gdb to get a stack trace.
> gdb wouldn't let me (something about an OS/kernel failure).  On
> reflection maybe I should have tried with Activity Monitor, but that
> didn't occur to me in the heat of the moment.
> 
> 3. I then tried "kill -ABRT", hoping that would produce a debuggable
> core dump.  It stopped the xterm alright, but I can't find a core.
> 
> Anyway, this is the first time I've seen anything like this, so it
> isn't terribly reproducible.  Just mentioning it in case anyone has
> seen the like, or has a better idea about how to gather evidence
> if it happens again.
> 
> 			regards, tom lane
> 
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