Added t/pt-deadlock-logger/samples/bug_1082104.txt & changed the username regex per Daniel's comments

bin/pt-deadlock-logger

@@ -3757,8 +3757,8 @@ my $d = qr/(\d+)/;                    # Digit
 my $t  = qr/((?:\d+ \d+)|(?:[A-Fa-f0-9]+))/;                # Transaction ID
 my $i = qr/((?:\d{1,3}\.){3}\d+)/;    # IP address
 my $n = qr/([^`\s]+)/;                # MySQL object name
-my $u = qr/((?!\b[0-9]+\b)\S+)/;      # Username. This is somewhat wrong, but
+my $u = qr/(\S+)/;                    # Username. This is somewhat wrong, but
-                                      # usernames with spcaes are rare enough.
+                                      # usernames with spaces are rare enough.
 my $s = qr/(\d{6} .\d:\d\d:\d\d)/;    # InnoDB timestamp
 
 # A thread's proc_info can be at least 98 different things I've found in the
@@ -4388,6 +4388,10 @@ held lock, you're looking at the same lock, so of course you'd prefer to see
 both wait-for locks and get more information.  If the two waited-for locks are
 not on the same table, more than two transactions were involved in the deadlock.
 
+Finally, keep in mind that, because usernames with spaces are not quoted by
+InnoDB, the tool will generally misreport the second word of these usernames
+as the hostname.
+
 =head1 OPTIONS
 
 This tool accepts additional command-line arguments.  Refer to the

t/pt-deadlock-logger/samples/bug_1082104.txt

@@ -0,0 +1,53 @@
+=====================================
+070915 15:34:37 INNODB MONITOR OUTPUT
+=====================================
+Per second averages calculated from the last 24 seconds
+------------------------
+LATEST DETECTED DEADLOCK
+------------------------
+111212 22:52:42
+*** (1) TRANSACTION:
+TRANSACTION 3405, ACTIVE 161 sec starting index read
+mysql tables in use 1, locked 1
+LOCK WAIT 3 lock struct(s), heap size 376, 3 row lock(s), undo log entries 2
+MySQL thread id 19, OS thread handle 0x7fac301e4700, query id 180 localhost ro-ot Updating
+update a set movie_id=96 where id =2
+*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
+RECORD LOCKS space id 0 page no 307 n bits 72 index `PRIMARY` of table `test`.`a` trx id 3405 lock_mode X locks rec but not gap waiting
+Record lock, heap no 3 PHYSICAL RECORD: n_fields 6; compact format; info bits 0
+ 0: len 4; hex 80000002; asc ;;
+ 1: len 6; hex 000000003404; asc 4 ;;
+ 2: len 7; hex 040000163b2515; asc ;% ;;
+ 3: len 4; hex 80000063; asc c;;
+ 4: len 1; hex 01; asc ;;
+ 5: len 8; hex 8000124a7c1acb8c; asc J| ;;
+
+*** (2) TRANSACTION:
+TRANSACTION 3404, ACTIVE 1026 sec starting index read
+mysql tables in use 1, locked 1
+3 lock struct(s), heap size 376, 2 row lock(s), undo log entries 1
+MySQL thread id 18, OS thread handle 0x7fac30225700, query id 181 localhost ro-ot Updating
+update a set movie_id=98 where id =4
+*** (2) HOLDS THE LOCK(S):
+RECORD LOCKS space id 0 page no 307 n bits 72 index `PRIMARY` of table `test`.`a` trx id 3404 lock_mode X locks rec but not gap
+Record lock, heap no 3 PHYSICAL RECORD: n_fields 6; compact format; info bits 0
+ 0: len 4; hex 80000002; asc ;;
+ 1: len 6; hex 000000003404; asc 4 ;;
+ 2: len 7; hex 040000163b2515; asc ;% ;;
+ 3: len 4; hex 80000063; asc c;;
+ 4: len 1; hex 01; asc ;;
+ 5: len 8; hex 8000124a7c1acb8c; asc J| ;;
+
+*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
+RECORD LOCKS space id 0 page no 307 n bits 72 index `PRIMARY` of table `test`.`a` trx id 3404 lock_mode X locks rec but not gap waiting
+Record lock, heap no 5 PHYSICAL RECORD: n_fields 6; compact format; info bits 0
+ 0: len 4; hex 80000004; asc ;;
+ 1: len 6; hex 000000003405; asc 4 ;;
+ 2: len 7; hex 0500000e7017e8; asc p ;;
+ 3: len 4; hex 80000062; asc b;;
+ 4: len 1; hex 01; asc ;;
+ 5: len 8; hex 8000124a7c1acbb6; asc J| ;;
+
+*** WE ROLL BACK TRANSACTION (2)
+END OF INNODB MONITOR OUTPUT
+============================