--- a/isearch	Wed Nov 02 15:22:48 2011 +0100
+++ b/isearch	Thu Nov 03 16:08:48 2011 +0100
@@ -85,15 +85,29 @@
 
 for (@{$f}) {
 
-    next unless /volke.*2011/;
-
     print "Examining $_ ...\n";
     $imap->examine($_)
       or die "Can't examine: " . $imap->LastError . "\n";
     print "Searching $_ ...\n";
-    my $m = $imap->search( $opts->{criteria} )
-      or die "Can't search: " . $imap->LastError . "\n";
-    $mids->{$_} = $m;
+    if ( my $m = $imap->search( $opts->{criteria} )) {
+        $mids->{$_} = $m;
+    } else {
+        my $e = $imap->LastError;
+        # dovecots fts plugin may just crash and cause the connection to drop
+        # (this happened when searching a mailbox containing just gzipped mail
+        # files and results in log messages like these:
+        # 2011-11-02 14:59:13 IMAP(userid): Panic: file squat-trie.c: line 877 (squat_build_word): assertion failed: (i + bytelen <= size)
+        # 2011-11-02 14:59:13 IMAP(userid): Error: Raw backtrace: imap [0x80f2fd1] -> imap [0x80f3052] -> imap [0x80f29a9] -> /usr/lib/dovecot/modules/imap/lib21_fts_squat_plugin.so [0xb744a50d] -> /usr/lib/dovecot/modules/imap/lib21_fts_squat_plugin.so(squat_trie_build_more+0x151) [0xb744a7a1] -> /usr/lib/dovecot/modules/imap/lib21_fts_squat_plugin.so [0xb7447a54] -> /usr/lib/dovecot/modules/imap/lib20_fts_plugin.so(fts_backend_build_more+0x2e) [0xb7453e7e] -> /usr/lib/dovecot/modules/imap/lib20_fts_plugin.so [0xb7456fb6] -> imap(mailbox_search_next_nonblock+0x2d) [0x80b6e7d] -> imap [0x806e221] -> imap(imap_search_start+0x150) [0x806e700] -> imap(cmd_search+0xff) [0x8064d2f] -> imap [0x8067c6c] -> imap [0x8067d09] -> imap(client_handle_input+0x2d) [0x8067e7d] -> imap(client_input+0x5f) [0x80687df] -> imap(io_loop_handler_run+0xe0) [0x80fbd80] -> imap(io_loop_run+0x20) [0x80fb1f0] -> imap(main+0x5ea) [0x80713ba] -> /lib/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb75f1455] -> imap [0x8060351]
+        # 2011-11-02 14:59:13 dovecot: Error: child 7559 (imap) killed with signal 6 (core dumps disabled)
+        if ($e eq 'socket closed while reading data from server') {
+            $imap->connect
+                or die "Could not connect to IMAP server: $@\n";
+        } else {
+
+            die "Can't search: $e\n";
+
+        }
+    }
 
 }