Bug #16746 QNX server crashes

Description:
We see several server crashes in the test suite for latest 5.1 bitkeeper.

The failures have been there for some days, hidden by a problem that caused QNX compile failures. The problem seems to have been caused by a push somewhere between January 12 and January 20.

The problem has been reproduced in this changeset: 

reggie@linux.site|ChangeSet|20060124042032|11236
ChangeSet@1.2071, 2006-01-23 22:20:32-06:00, reggie@linux.site
  Merge rburnett@bk-internal.mysql.com:/home/bk/mysql-5.1-new
  into  linux.site:/home/reggie/work/mysql-5.1

How to repeat:
Run the testsuite on buildqnx2. For example:

> MTR_BUILD_THREAD=4 perl mysql-test-run.pl --tmpdir=/tmp/knielsen log_tables

log_tables                     [ fail ]

Errors are (from /home/mysqldev/pb/mysql-5.1-new/push-reggie@linux.site-20060124054103.info/mysql-5.1.6-alpha-standard/mysql-test/var/log/mysqltest-time) :
mysqltest: At line 67: query 'lock tables mysql.general_log WRITE' failed with wrong errno 2013: 'Lost connection to MySQL server during query', instead of 1532
...

> MTR_BUILD_THREAD=4 perl mysql-test-run.pl --tmpdir=/tmp/knielsen csv    

csv                            [ fail ]

Errors are (from /home/mysqldev/pb/mysql-5.1-new/push-reggie@linux.site-20060124054103.info/mysql-5.1.6-alpha-standard/mysql-test/var/log/mysqltest-time) :
mysqltest: At line 20: query 'INSERT INTO t1 VALUES (9410,9412)' failed: 48: Woops, blew up opening a mapped file

Several other tests fail, will attach a full test log.

Full test log with crashing tests

Attachment: test.log (text/x-log), 83.12 KiB.