Six bowlers conceding 100 or more runs is indeed a record for Test cricket, although there are those who might argue that that recent match
at Bulawayo shouldn't really be called a Test. The same thing very nearly happened
at Kingston in 1954-55, when Australia made 758 for 8 dec against West Indies. Five players scored centuries in that innings - a record - and five bowlers conceded hundreds too: Tom Dewdney, Frank King, Denis Atkinson, Collie Smith and Frank Worrell ... and Garry Sobers just missed out, with 1 for 99. There have been three other instances of five bowlers conceding more than 100 in the same innings -
at Lord's in 1973, when West Indies made 652 for 8 dec, with Sobers making 150 not out, and all five England bowlers (Geoff Arnold, Bob Willis, Tony Greig, Derek Underwood and Ray Illingworth) went for more than 100. It also happened
at Brisbane in 1993-94, when Australia scored 607 for 6 dec against New Zealand, for whom Danny Morrison, Chris Cairns, Simon Doull, Richard de Groen and Dipak Patel all leaked tons. The most-recent instance was
at Perth last October, when Zimbabwe were on the receiving end of Matthew Hayden's then-record innings of 380.