Invalid memory alloc request size

Over the weekend, Amazon did some maintenance that resulted in one of our
instances being restarted. Apparently this left the database in a bad
state. This particular instance functions as a slony replication target and
when I went to start up slony, I get the following error message. Here's
some relevant info. The last bit is from the slony log file and it shows
the "invalid memory alloc request size" error. Is there a way to recover
this or do I go ahead and restore from backup?

ubuntu(at)ip-10-90-23-122:~$ psql -U postgres -c "SELECT version();"
PostgreSQL 9.3.5 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.1.2
20080704 (Red Hat 4.1.2-52), 64-bit
(1 row)

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.4 LTS
Release: 12.04
Codename: precise

2015-08-24 06:50:03 UTC INFO remoteWorkerThread_1: syncing set 1 with 102
table(s) from provider 1
2015-08-24 06:50:33 UTC ERROR remoteWorkerThread_1_1: error at end of COPY
IN: ERROR: invalid memory alloc request size 1970234207
CONTEXT: COPY sl_log_1, line 97033:
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