Postmaster crashes after upgrade to 8.1.4!

Upgrading from 8.1.3 to 8.1.4, I compiled with the same configure flags,
installed to a separate directory, shut down 8.1.3, copied the "data" directory
over to the new 8.1.4 directory (cp -Rp), set my symlinks so that
/usr/local/pgsql points to the new 8.1.4 directory, and fired it up.  I ran
some queries, inserts, updates, deletes, etc. Everything looked good! I removed
the old data directory since by leaving it there we'd be strapped for space,
and I went to bed. Everything ran fine until 4AM when the database dump runs.
After that we've been extremely unstable... We run, we crash, we run, we crash
... Here's a snippet of what I've been seeing...

2006-05-25 08:29:26.665 EDT   LOG:  all server processes terminated;
reinitializing
2006-05-25 08:29:26.677 EDT   LOG:  database system was interrupted at
2006-05-25 08:28:55 EDT
2006-05-25 08:29:26.678 EDT   LOG:  checkpoint record is at 28/3C0A35D8
2006-05-25 08:29:26.678 EDT   LOG:  redo record is at 28/3C0A35D8; undo record
is at 0/0; shutdown TRUE
2006-05-25 08:29:26.678 EDT   LOG:  next transaction ID: 204190433; next OID:
186871674
2006-05-25 08:29:26.678 EDT   LOG:  next MultiXactId: 1; next MultiXactOffset:
0
2006-05-25 08:29:26.678 EDT   LOG:  database system was not properly shut down;
automatic recovery in progress
2006-05-25 08:29:26.688 EDT   LOG:  redo starts at 28/3C0A3628
2006-05-25 08:29:26.702 EDT   LOG:  unexpected pageaddr 28/28102000 in log file
40, segment 60, offset 1056768
2006-05-25 08:29:26.702 EDT   LOG:  redo done at 28/3C0FFDF8
2006-05-25 08:29:27.097 EDT myuser mydata 192.168.167.4(54695)FATAL:  the
database system is starting up
2006-05-25 08:29:27.303 EDT   LOG:  database system is ready
2006-05-25 08:29:27.303 EDT   LOG:  transaction ID wrap limit is 1073799886,
limited by database "postgres"
2006-05-25 08:30:34.139 EDT   LOG:  autovacuum: processing database "mydata"
2006-05-25 08:30:50.076 EDT   LOG:  server process (PID 32140) was terminated
by signal 11
2006-05-25 08:30:50.076 EDT   LOG:  terminating any other active server
processes
2006-05-25 08:30:50.076 EDT myuser mydata 10.0.1.1(4135)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.076 EDT myuser mydata 10.0.1.1(4135)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.076 EDT myuser mydata 10.0.1.1(4135)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.077 EDT myuser mydata 10.0.0.12(2990)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.077 EDT myuser mydata 10.0.0.12(2990)DETAIL:  The
postmaster has commanded this server process to roll back the current
transaction and exit, because another server process exited abnormally and
possibly corrupted shared memory.
2006-05-25 08:30:50.077 EDT myuser mydata 10.0.0.12(2990)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.078 EDT myuser mydata 192.168.167.4(54696)WARNING:
terminating connection because of crash of another server process
2006-05-25 08:30:50.078 EDT myuser mydata 192.168.167.4(54696)DETAIL:  The
postmaster has commanded this server process to roll back the current
transaction and exit, because another server process exited abnormally and
possibly corrupted shared memory.
2006-05-25 08:30:50.078 EDT myuser mydata 192.168.167.4(54696)HINT:  In a
moment you should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.080 EDT myuser mydata 10.0.2.1(4474)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.080 EDT myuser mydata 10.0.2.1(4474)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.080 EDT myuser mydata 10.0.2.1(4474)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4473)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4473)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4473)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4459)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4459)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.081 EDT myuser mydata 10.0.2.1(4459)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.084 EDT myuser mydata 10.0.1.1(4128)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.084 EDT myuser mydata 10.0.1.1(4128)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.084 EDT myuser mydata 10.0.1.1(4128)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.1.1(4129)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.1.1(4129)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.1.1(4129)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.2.1(4472)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.2.1(4472)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.085 EDT myuser mydata 10.0.2.1(4472)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.086 EDT myuser mydata 10.0.1.1(4130)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.086 EDT myuser mydata 10.0.1.1(4130)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.086 EDT myuser mydata 10.0.1.1(4130)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.2.1(4471)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.2.1(4471)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.2.1(4471)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.1.1(4131)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.1.1(4131)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.087 EDT myuser mydata 10.0.1.1(4131)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4138)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4138)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4138)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4136)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4136)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4136)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4132)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.088 EDT myuser mydata 10.0.1.1(4132)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.089 EDT myuser mydata 10.0.1.1(4132)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.089 EDT myuser mydata 10.0.1.1(4133)WARNING:  terminating
connection because of crash of another server process
2006-05-25 08:30:50.089 EDT myuser mydata 10.0.1.1(4133)DETAIL:  The postmaster
has commanded this server process to roll back the current transaction and
exit, because another server process exited abnormally and possibly corrupted
shared memory.
2006-05-25 08:30:50.089 EDT myuser mydata 10.0.1.1(4133)HINT:  In a moment you
should be able to reconnect to the database and repeat your command.
2006-05-25 08:30:50.091 EDT   LOG:  all server processes terminated;
reinitializing
2006-05-25 08:30:50.103 EDT   LOG:  database system was interrupted at
2006-05-25 08:29:27 EDT
2006-05-25 08:30:50.103 EDT   LOG:  checkpoint record is at 28/3C101AE8
2006-05-25 08:30:50.103 EDT   LOG:  redo record is at 28/3C101AE8; undo record
is at 0/0; shutdown TRUE
2006-05-25 08:30:50.103 EDT   LOG:  next transaction ID: 204190698; next OID:
186879866
2006-05-25 08:30:50.103 EDT   LOG:  next MultiXactId: 1; next MultiXactOffset:
0
2006-05-25 08:30:50.103 EDT   LOG:  database system was not properly shut down;
automatic recovery in progress
2006-05-25 08:30:50.114 EDT   LOG:  redo starts at 28/3C101B38


What could be wrong? I am panicking. Please advise!

CG

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