From: utzoo!decvax!cca!hplabs!hao!menlo70!sytek!zehntel!teklabs!ucbcad!ucbvax:ARPAVAX:sam@sri-unix
Newsgroups: net.unix-wizards
Title: Re: I/O Error in Push
Article-I.D.: ucbarpa.2554
Posted: Fri Nov 12 18:39:59 1982
Received: Tue Nov 16 05:52:49 1982

If you see a panic, "I/O error in push" without a printf from the
device driver, it's almost certain that you ran out of space in the
paging area.  This is because of the check mentioned in sw.c that
set B_ERROR when the requested block number is outside the limits
of the paging area.