infinite loop when copying to ext2fs

[Kris Kennaway]

Jakub Siroky wrote:
> I have two large ext2fs partitions (368 and 313GB) to hold data shared between several OSes. While there were no problems on 6-STABLE branch I was quite disappointed after upgrade to 7-STABLE. Whenever I copy/write to ext2fs partition the system freezes totally without crashdump. So I set debugging settings to kernel config (DEBUG,WITNESS,..) and in console I reproduced error situation ending with full screen of unstoppable running text with lot of memory addresses and a few recognisable words: 'new block bit set for ext already' - again with no crashdump. Then I have formatted 1GB partition with ext2fs and the problem on this small partition appears only sometimes. 

OK, I am able to reproduce this.

Kris