The CVE is described in https://nvd.nist.gov/vuln/detail/CVE-2016-2383 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a1b14d27ed0965838350f1377ff97c93ee383492
The the verifier sometimes rewrites instructions into multiple instructions, as seen in the example in the commit message:
insns[0] insns[0]