In my private build of !12492 I'm getting some assertion failures in CheckUnload (see below). This can't possibly be my fault! I don't know if CI perhaps has these assertion switched off, so only I am seeing them? I'd open a ticket but it may just be my bad, somehow Any ideas? Simon Stderr run ( MultiLayerModulesDefsGhci ): ghc: internal error: ASSERTION FAILED: file rts/CheckUnload.c, line 460 (GHC version 9.11.20240530 for x86_64_unknown_linux) Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug Aborted *** unexpected failure for MultiLayerModulesDefsGhci(ghci) ]0;MultiLayerModulesDefsGhciReload(ghci) 4776 of 10144 [0, 1, 0] ]0;InstanceMatching(normal) 4777 of 10144 [0, 1, 0] ]0;Running for 5m51s [35433/36451], predicted 1s (98%) Wrong exit code for MultiLayerModulesDefsGhciReload(ghci)(expected 0 , actual 134 ) Stderr run ( MultiLayerModulesDefsGhciReload ): ghc: internal error: ASSERTION FAILED: file rts/CheckUnload.c, line 460 (GHC version 9.11.20240530 for x86_64_unknown_linux) Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug Aborted *** unexpected failure for MultiLayerModulesDefsGhciReload(ghci) ]0;InstanceMatching1(normal) 4778 of 10144 [0, 2, 0] ]0;MultiLayerModulesNoCode(ghci) 4779 of 10144 [0, 2, 0] Wrong exit code for MultiLayerModulesNoCode(ghci)(expected 0 , actual 134 ) Stderr run ( MultiLayerModulesNoCode ): ghc: internal error: ASSERTION FAILED: file rts/CheckUnload.c, line 460 (GHC version 9.11.20240530 for x86_64_unknown_linux) Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug Aborted