I can confirm this problem. In my case my main userland is 64-bit, so it doesn't stop my host from booting, but I have a 32-bit chroot, which I use to run some important 32-bit applications. With kernel 2.6.26, I can chroot with no trouble. With kernel 2.6.32 (a custom build), I can't-- all 32-bit shells and applications segfault.