Comment # 70 on bug 1200461 from Jiri Slaby

(In reply to Franck Bui from comment #58)
> or maybe simply try to dump the config attribute with dd once with "bs=4096"
> and once with "bs=4097" ?

This was buried and not tested, right? But it still makes sense to test...

i.e. is there any difference:
strace dd if=config bs=4096 of=/dev/null # should not hang
strace dd if=config bs=4097 of=/dev/null # might hang
?

config is the same you passed to cat.