I revised the patch a little bit. It needs an additional bounds check
for insn_idx. And another seen=true line needs to removed. See the newly
attached patch.

** Patch added: "Revised BPF verifier fix"
   
https://bugs.launchpad.net/ubuntu/+source/linux-meta-lts-xenial/+bug/1763352/+attachment/5118067/+files/bpf-fix1.patch

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https://bugs.launchpad.net/bugs/1763352

Title:
  kernel panic in bpf_map_update_elem (with bcc tool ext4slower)

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