Instability also seen on Solaris:
http://dbtg.foundry.sun.com/derby/test/Daily/jvm1.6/testing/testlog/sol/810585-derbyall_diff.txt
although slightly different signature:

> APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
28579a28581
> APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
28586a28589
> APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
Test Failed.

Saw following on trunk at revision 1069761 with Sun's jvm 1.6.0_18 on tinderbox http://dbtg.foundry.sun.com/derby/test/tinderbox_trunk16/jvm1.6/testing/testlog/SunOS-5.10_i86pc-i386/1069761-derbyall_diff.txt

• • • Start: updatelocks jdk1.6.0_18 storemats:storemats 2011-02-11 14:11:23 ***
      2847,2856d2846
      < APP |UserTran|TABLE |1 |IX |A |Tablelock |GRANT|ACTIVE
      < ij> next scan_cursor;
      < A |B |C
      < --------------------------------------------------------------------------------------------------------------------------------------------------------
      < 3 |-30 |-three
      < ij> update a set b=30,c='three' where current of scan_cursor;
      < 1 row inserted/updated/deleted
      < ij> select * from lock_table order by tabname, type desc, mode, cnt, lockname;
      < USERNAME|TRANTYPE|TYPE |CNT |MODE|TABNAME |LOCKNAME |STATE|STATUS
      < ---------------------------------------------------------------------------
      2857a2848,2857
      > ij> next scan_cursor;
      > A |B |C
      > --------------------------------------------------------------------------------------------------------------------------------------------------------
      > 3 |-30 |-three
      > ij> update a set b=30,c='three' where current of scan_cursor;
      > 1 row inserted/updated/deleted
      > ij> select * from lock_table order by tabname, type desc, mode, cnt, lockname;
      > USERNAME|TRANTYPE|TYPE |CNT |MODE|TABNAME |LOCKNAME |STATE|STATUS
      > ---------------------------------------------------------------------------
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      2867 del
      < APP |UserTran|TABLE |2 |IX |A |Tablelock |GRANT|ACTIVE
      2867a2867
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      2874 del
      < APP |UserTran|TABLE |2 |IX |A |Tablelock |GRANT|ACTIVE
      2874a2874
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      14688,14697d14687
      < APP |UserTran|TABLE |1 |IX |A |Tablelock |GRANT|ACTIVE
      < ij> next scan_cursor;
      < A |B |C
      < --------------------------------------------------------------------------------------------------------------------------------------------------------
      < 3 |-30 |-three
      < ij> update a set b=30,c='three' where current of scan_cursor;
      < 1 row inserted/updated/deleted
      < ij> select * from lock_table order by tabname, type desc, mode, cnt, lockname;
      < USERNAME|TRANTYPE|TYPE |CNT |MODE|TABNAME |LOCKNAME |STATE|STATUS
      < ---------------------------------------------------------------------------
      14698a14689,14698
      > ij> next scan_cursor;
      > A |B |C
      > --------------------------------------------------------------------------------------------------------------------------------------------------------
      > 3 |-30 |-three
      > ij> update a set b=30,c='three' where current of scan_cursor;
      > 1 row inserted/updated/deleted
      > ij> select * from lock_table order by tabname, type desc, mode, cnt, lockname;
      > USERNAME|TRANTYPE|TYPE |CNT |MODE|TABNAME |LOCKNAME |STATE|STATUS
      > ---------------------------------------------------------------------------
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      14708 del
      < APP |UserTran|TABLE |2 |IX |A |Tablelock |GRANT|ACTIVE
      14708a14708
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      14716 del
      < APP |UserTran|TABLE |2 |IX |A |Tablelock |GRANT|ACTIVE
      14716a14716
      > APP |UserTran|TABLE |3 |IX |A |Tablelock |GRANT|ACTIVE
      Test Failed.
    • End: updatelocks jdk1.6.0_18 storemats:storemats 2011-02-11 14:11:35 ***
      ------------------------------------------------------

Seen also when testing the 10.8.1.0 release candidate on Solaris 9:

• • • • • • • • • Diff file derbyall/encryptionAll/storemats/storemats/updatelocks.diff
    • Start: updatelocks jdk1.6.0_24 storemats:storemats 2011-04-05 13:40:19 ***
      5420a5421
      > APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
      5431a5433
      > APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
      5440a5443
      > APP |UserTran|ROW |1 |U |A |(4,6) |GRANT|ACTIVE
      Test Failed.
    • End: updatelocks jdk1.6.0_24 storemats:storemats 2011-04-05 13:40:45 ***

http://dbtg.foundry.sun.com/derby/test/10.8.1.0_RC-1/logs/jvm1.6/solN-1/derbyall/report.txt

Failed in 10.8, windows, ibm142 run
http://people.apache.org/~myrnavl/derby_test_results/v10_8/windows/testlog/ibm142/1242208-derbyall_diff.txt

It looks like an unexpected committed deleted row, the test has just deleted and commited just prior to these
locks being checked.

• • • Start: updatelocks jdk1.4.2 storemats:storemats 2012-02-08 20:35:38 ***
      28561a28562
      > APP |UserTran|ROW |1 |U |A |(2,6) |GRANT|ACTIVE
      28570a28572
      > APP |UserTran|ROW |1 |U |A |(2,6) |GRANT|ACTIVE
      28579a28582
      > APP |UserTran|ROW |1 |U |A |(2,6) |GRANT|ACTIVE
      28586a28590
      > APP |UserTran|ROW |1 |U |A |(2,6) |GRANT|ACTIVE
      Test Failed.
    • End: updatelocks jdk1.4.2 storemats:storemats 2012-02-08 20:36:58 ***

Note that this test has been converted in trunk, so these errors should not happen in versions after 10.8. I ran trunk with
Knut's patch in DERBY-1913 to sleep in the background daemon and did no see a failure in the updated test.

DERBY-5305, which converted this test to a new junit test and removed the existing updatelocks.sql has been implemented in trunk (10.9) and backported to 10.8. So should not see this issue again in 10.8 or future releases.

Reopen for 10.5 backport consideration. If working on the backport for this issue. Temporarily assign yourself and add a comment that you are working on it. When finished, reresolve with the new fix versions or label backport_reject_10_x as appropriate.

I don't think this one is worth backporting now. It is fixed with a newly converted test in 10.8. I suggest delaying backport until someone running
old versions sees and complains about the error.

Failed on 10.7 codeline (1525194) on Windows machine with ibm1.5
http://people.apache.org/~myrnavl/derby_test_results/v10_7/windows/testlog/ibm15/1525194-derbyall_diff.txt
Diff file derbyall/encryptionAll/storemats/storemats/updatelocks.diff
Start: updatelocks jdk1.5.0 storemats:storemats 2013-09-21 01:24:39 ***
22688d22687
< APP |UserTran|ROW |1 |X |A |(4,6) |GRANT|ACTIVE
22690a22690
> APP |UserTran|ROW |2 |X |A |(4,6) |GRANT|ACTIVE
Test Failed.
End: updatelocks jdk1.5.0 storemats:storemats 2013-09-21 01:24:53 ***
------------------------------------------------------