ghc 6.10.4 seg fault in ghci when showing negative float

[ben@…]

On Snow Leopard, 64-bit, ghci will seg fault when attempting to show a negative float.

Example:

$ ghci
GHCi, version 6.10.4: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> 0.5
0.5
Prelude> -0.5
-Segmentation fault

The seg fault does happen after the sign is displayed.

A file compiled by ghc does not display the same behavior. Given a file test.hs:

main = putStr $ show (-0.5)

And compiling with ghc --make test, the result will run normally.

Possibly related to tickets #24670, #24571.

[jmr@…]

Could you attach the crash report? That's always helpful when reporting a segfault-causing bug.

[ben@…]

Crash report

[gwright@…]

I'll see if this still happens with the upcoming 6.12.3 and 7.0.1.

[raimue@…]

Port abandoned, #35561.