Hi,

looking at kern/7321, I saw that the panic mentioned 
is produced as result of 

#ifdef DIAGNOSTIC
                        if (ISSET(bp->b_flags, B_DONE|B_DELWRI) &&
                            bp->b_bcount < size)
                                panic("getblk: block size invariant failed");
#endif
(kern/vfs_bio.c)

While it is a good idea, to have some invariant checking now and then,
I don't see the point to panic the system here.

Either 

- the checked invariant is not important, so a printf() is enough

or 

- the check is important as it could lead to inconsistent data
otherwise, then it shoudl always be executed and not only when
DIAGNOSTIC is defined.

What do others think?


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