Comment 16 for bug 1850184

We found the issue -- I think xnox is going to report it via proper channels. But basically it's this:

<mwhudson> sizeof(dev_t) = 4 sizeof(__kernel_old_dev_t) = 8

This makes the kernel's loop_info 8 bytes bigger than klibc's and so the kernel is writing past the end of the loopinfo on the stack, which until now has avoided causing problems by sheer luck.