Error while running pg_dump

Hi,

v7.3.3

$ pg_dump -Ft -v test1 | gzip > test1.pdmp.tar.gz
pg_dump: saving database definition
pg_dump: reading namespaces
pg_dump: reading user-defined types
[snip]
pg_dump: dumping contents of table t_lane_tx2
pg_dump: dumping contents of table t_lane_tx
pg_dump: [tar archiver] could not write to tar member (wrote 47,
attempted 317)

Has anyone seen this error before?

TIA
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