RTS Assertion Crash

I occasionally get the following crash when I compile with -debug:

internal error: ASSERTION FAILED: file rts/Schedule.c, line 1268

    (GHC version 7.4.2 for x86_64_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

If the application is not compiled with -debug this does not seem to happen. Usually I just don't link in the debug runtime however I have been trying to rundown an IO that never completes. I can't post the app but I am happy to collect information to attach to this ticket.

Edited Mar 09, 2019 by Ian Lynagh -

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RTS Assertion Crash