Re: notmuch segfault

diff --git a/b7/81a216dd789e1b8da8dd83610526560ce40644 b/b7/81a216dd789e1b8da8dd83610526560ce40644
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+From: "Sebastian Spaeth" <Sebastian@SSpaeth.de>\r
+To: Notmuch development list <notmuch@notmuchmail.org>\r
+Subject: Re: notmuch segfault\r
+In-Reply-To: <8739ym4mxk.fsf@SSpaeth.de>\r
+References: <8739ym4mxk.fsf@SSpaeth.de>\r
+Date: Fri, 23 Apr 2010 15:26:51 +0200\r
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+\r
+It happened again. Both times I had pressed "G" which calls offlineimap\r
+and which removed messages that the notmuch database still thought are there.\r
+\r
+----------------------------------------------------------------\r
+Program received signal SIGSEGV, Segmentation fault.\r
+0x00007ffff602bb14 in strncasecmp () from /lib/libc.so.6\r
+(gdb) bt\r
+#0  0x00007ffff602bb14 in strncasecmp () from /lib/libc.so.6\r
+#1  0x0000000000418521 in _thread_add_matched_message(_notmuch_thread*, _notmuch_message*, notmuch_sort_t) ()\r
+#2  0x0000000000418b17 in _notmuch_thread_create ()\r
+#3  0x000000000040e33c in notmuch_show_command ()\r
+#4  0x0000000000408436 in main ()\r
+\r
+-------------------------------------------------------------\r
+spaetz@spaetz-macbook:~/src/notmuch$ notmuch show tag:inbox\r
+Error opening /home/spaetz/mail/INBOX.Junk/new/1272025029_0.17175.spaetz-macbook,U=3608,FMD5=22888fa7f8daa670f25d806e9b4ae4df:2,: No such file or directory\r
+Error opening /home/spaetz/mail/INBOX.Junk/new/1272025029_0.17175.spaetz-macbook,U=3608,FMD5=22888fa7f8daa670f25d806e9b4ae4df:2,: No such file or directory\r
+Error opening /home/spaetz/mail/INBOX.Junk/new/1272025029_0.17175.spaetz-macbook,U=3608,FMD5=22888fa7f8daa670f25d806e9b4ae4df:2,: No such file or directory\r
+Segmentation fault (core dumped)\r
+\r
+----------------------------------------------------------\r
+Coredump is here:\r
+http://sspaeth.de/uploads/tmp/core.bin\r
+-------------------------------------------------------------\r
+\r
+\r
+Can it be that in thread.cc in _thread_add_matched_message ()\r
+...\r
+    subject = notmuch_message_get_header (message, "subject");\r
+\r
+    if ((strncasecmp (subject, "Re: ", 4) == 0) ||\r
+...\r
+\r
+If the underlying message disappeared, get_header will return NULL and\r
+we pass strncasecmp NULL as first parameter. Could that be?\r
+\r