Comment 0 for bug 1765083

As pointed out in the glibc bug[1], there's a kernel bug preventing unwinding due to an incorrect pointer being copied to userspace. A 1-line patch[2] has been committed to Linus's tree to fix this.

I investigated, and this only affects 4.15, so we only need this applied to bionic.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=22916
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b09ca746a643ca452cd41a522046a96ee5a55fd