Segmentation fault in reactive program
Trying to debug reactive, I triggered what appears to be a GHC bug. To clarify:
- Replacing "foo
unamb
barunamb
baz" with foldl1 unamb [foo,bar,baz] in one particular function causes a segmentation fault at runtime, in all possible permutations of -threaded/nonthreaded and GHC 6.10.3/6.11. Further, a number of different changes do the same, quite unpredictably.
The hackage version of reactive does not exhibit this bug. I've attached a quite minimal patch to it that causes this, as well as a test program to trigger it.
I've been trying to debug this myself, with very little success. No level of core-lint or debug checks causes this code to trigger assertions instead of outright segfaults.
Incidentally, lazysmallcheck-0.3, a dependency of reactive, does not compile against 6.11 due to a name change in the Data.Generics interface. I've uploaded a fixed version to http://brage.info/~svein/lsc.tar.gz.
Trac metadata
Trac field | Value |
---|---|
Version | 6.11 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |