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Date: Sat, 8 Feb 2003 19:30:45 -0800
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From: Roland McGrath <roland@redhat.com>
To: Linus Torvalds <torvalds@transmeta.com>
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Cc: Anton Blanchard <anton@samba.org>, linux-kernel@vger.kernel.org,
       Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@digeo.com>,
       <arjanv@redhat.com>
Subject: Re: heavy handed exit() in latest BK
In-Reply-To: Linus Torvalds's message of  Saturday, 8 February 2003 18:33:06 -0800 <Pine.LNX.4.44.0302081826230.7675-100000@home.transmeta.com>
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X-Zippy-Says: I'm wet!  I'm wild!
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There is definitely something after that patch.  gdb is broken in ways that
are being mysterious to me, and now zombies with ppid 1 are sticking around
forever.  With that patch, do:

  bash$ (sleep 2 & echo zombie $! ; exec sleep 10000000) & sleep 4; kill -9 $!
  [2] 1220
  zombie 1222
  bash$ ps l1222
  [2]+  Killed                  ( sleep 2 & echo zombie $!; exec sleep 10000000 )
  F   UID   PID  PPID PRI  NI   VSZ  RSS WCHAN  STAT TTY        TIME COMMAND
  0  5281  1222     1  15   0     0    0 wait4  Z    pts/1      0:00 [sleep <defun

Such zombies seem to stick around forever.  I must have managed to break
the normal delivery of SIGCHLD to init, but right now it's a mystery to me how.