notmuch zombie apocolypse

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+From: David Bremner <david@tethera.net>\r
+To: notmuch <notmuch@notmuchmail.org>\r
+Subject: notmuch zombie apocolypse\r
+User-Agent: Notmuch/0.15.2+137~ga13b388 (http://notmuchmail.org) Emacs/24.3.1\r
+       (x86_64-pc-linux-gnu)\r
+Date: Wed, 12 Jun 2013 10:31:36 +0900\r
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+\r
+\r
+Hi All;\r
+\r
+I've noticed some strange behaviour with zombie processes and\r
+notmuch-emacs.\r
+\r
+* 0.15.2\r
+- start large search, quit (with q)\r
+- zombie is created\r
+- repeat as many times as you like.\r
+- first search to complete, all zombies are gone.\r
+- CPU is not pegged.\r
+\r
+* 0.15.2+174\r
+  - even searches that complete create zombies\r
+  - cpu usage of emacs process hits 100%\r
+\r
+Defining the former as "good" and the latter as "bad", \r
+bisect reveals 08fde50bf3a4c5 as the first "bad" commit.\r
+\r
+I am running emacs 24.3.1 on Debian jessie, with linux kernel 3.9.5-1\r
+from unstable.\r
+\r
+The bug is pretty annoying since it runs down the battery on my\r
+laptop. In a quick test on another machine running Debian wheezy but\r
+still emacs 24.3.1, I don't see any zombies created at all. I'm not sure\r
+what the imprtant variable is, libc, glib, kernel...\r
+\r
+d\r
+\r
+\r