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From:	Qian Hong <fracting AT gmail DOT com>
Date:	Mon, 2 Nov 2015 03:08:27 +0800
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Subject:	Re: Randomly hang when compiling Cygwin on Cygwin on Wine
To:	cygwin <cygwin AT cygwin DOT com>
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Update:

I have another case of hang:

?(1)-+-bash(1419290)
     |-bash(1419318)---make(1423770)---sh(1423783)---sh(1423838)
     |-mintty(1249269)---bash(1249277)
     |-mintty(47)---bash(55)---bash(1132827)---make(1139169)---sh(1139182)---make(1139234)---sh(1206695)---sh(1206721)---make(1206764)---sh(1206770)---make(1206783)---perl(1249042)
     |-mintty(596773)---bash(596790)---pstree(1423865)
     `-mintty(1417449)---bash(1417457)


$ ps aux | grep 1249042
  1249042 1206783 1132827    1249050  pty0      197608   Oct 31 /usr/bin/perl
  1249077 1249042 1132827    1249092  pty0      197608   Oct 31
/usr/bin/nm <defunct>



Here the process perl(1249042) is waiting for a pipe, while its child
process nm(1249077) is in the status "defunct". nm(1249077) appears in
output of `ps aux`, but doesn't appear in output of `pstree -p -l`.

Is there any case, where a child process can exit unexpected, but the
parent process still incorrectly wait for the child process forever?

Thanks!

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