Miscompilation since rustc 1.32.0-nightly (04fdb44f5 2018-11-03)

[ordian]

parity-ethereum tests (in module ethcore-miner, sorry don't have time to minimize the test case) fail since nightly-2018-11-04, but pass on stable, beta and nightly-2018-11-03:

❯ rustup toolchain install nightly-2018-11-03
nightly-2018-11-03-x86_64-unknown-linux-gnu installed - rustc 1.32.0-nightly (8b096314a 2018-11-02)
❯ cargo +nightly-2018-11-03 test -p ethcore-miner
test result: ok. 57 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
❯ rustup toolchain install nightly-2018-11-04 
nightly-2018-11-04-x86_64-unknown-linux-gnu installed - rustc 1.32.0-nightly (04fdb44f5 2018-11-03)
❯ cargo +nightly-2018-11-04 test -p ethcore-miner
test result: FAILED. 50 passed; 7 failed; 0 ignored; 0 measured; 0 filtered out

[nagisa]

Took a short look at this during the T-compiler meeting. It would be ideal to have a smaller reproduction case to work off as it does not immediately clear whether this is an actual bug in the compiler.

[nikic]

The big item in 8b09631...04fdb44 is the jemalloc removal. It would be good to check whether explicitly enabling jemalloc fixes the issue. (And by "fix" I mean "hide" -- this would indicate memory corruption.)

[ordian]

Ah, right, I guess this is related to heapsize crate we're using, which requires jemalloc to work properly if I'm not mistaken.