Disabling idle GC leads to freeze
I'm currently getting a runtime freeze with a spinning CPU with the latest GHC 8.0.1 RC (8.0.0.20160411). Testing 2 months ago on whatever was the latest release candidate showed no problems. The reproduction steps are a bit long winded:
- All tested on Ubuntu Linux.
- Checkout Shake, https://github.com/ndmitchell/shake.git (currently at 75505baa5fc5d1b99a1162edae6ecf7669f00ed9).
cabal install- Checkout Ninja, https://github.com/ninja-build/ninja.git (currently at 78f548880e549c701bd77760e4b3f3a4ee147641).
- Change to the
ninjadirectory. - Run
./configure.py --bootstrap - Run
cp ninja nin - Run
./nin -t clean - Run
shake
Observe that Shake fails to complete and starts spinning on 1 CPU.
If you modify shake.cabal to remove -with-rtsopts=-I0 -qg -qb then it works again and completes in < 1 min. Adding back flags with +RTS -I0 -RTS shows that -I0 alone is the culprit.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.1-rc3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Runtime System |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | simonmar |
| Operating system | |
| Architecture |