kernel error while using external USB storage

[Nirmal Govind <nirmalg@psu.edu>]

Hi.. I got a kernel error while I was backing up some files onto an 
external USB hard disk.. I was able to recover by hitting x.. here's the 
message from syslog.. any ideas on why this happened? I'm using benh-10...

Thanks,
nirmal

--
Nov  4 21:16:31 ibook kernel: Assertion failure in do_get_write_access()
at transaction.c:739: "(((jh2bh(jh))->b_state & (1UL << BH_Uptodate)) !=
0)"
Nov  4 21:16:31 ibook kernel: kernel BUG at transaction.c:739!
Nov  4 21:16:48 ibook kernel: Assertion failure in do_get_write_access()
at transaction.c:739: "(((jh2bh(jh))->b_state & (1UL << BH_Uptodate)) !=
0)"
Nov  4 21:16:48 ibook kernel: kernel BUG at transaction.c:739!