Bug in IO manager when increasing the number of capabilities
The new IO manager in HEAD has a logic error in the function responsible for creating more IO manager threads after increasing the number of capabilities with setNumCapabilities
. This results in an index-out-of-range error later on in the program when one perform blocking IO.
Test case:
import GHC.Conc
main = do
setNumCapabilities 2
getLine
$ ghc-stage2 -threaded program.hs
$ ./program
program: Ix{Int}.index: Index (1) out of range ((0,0))
The fix is simple and will be arriving shortly.
Trac metadata
Trac field | Value |
---|---|
Version | 7.7 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |