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There may be multiple issues at play, but when i was getting the code -11, running the profile-generate binary manually or through any script segfaulted. Non-pgo builds work fine for me, it's only the profile-generation binary that has issues. Skipping that and doing the final build without profile data negates the purpose of PGO.
Its possible your script is running the wrong binary, not stopping the build should it fail, or you're simply running into a different issue.
I've tried gcc 4.3 and 4.4, 4.4's profile-correction, enabling and disabling optimization, bare minimum mozconfigs, central and 191src. I used to run nightly builds with pgo on, and they just broke one day. I haven't gotten one to compile since.