Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC Commits: 10f06163 by Cheng Shao at 2025-08-25T14:30:16-04:00 wasm: ensure setKeepCAFs() is called in ghci This patch is a critical bugfix for #26106, see comment and linked issue for details. - - - - - 1 changed file: - utils/jsffi/dyld.mjs Changes: ===================================== utils/jsffi/dyld.mjs ===================================== @@ -1105,6 +1105,20 @@ class DyLD { if (/libHSghc-internal-\d+(\.\d+)*/i.test(soname)) { this.rts_init(); delete this.rts_init; + + // At this point the RTS symbols in linear memory are fixed + // and constructors are run, especially the one in JSFFI.c + // that does GHC RTS initialization for any code that links + // JSFFI.o. Luckily no Haskell computation or gc has taken + // place yet, so we must set keepCAFs=1 right now! Otherwise, + // any BCO created by later TH splice or ghci expression may + // refer to any CAF that's not reachable from GC roots (here + // our only entry point is defaultServer) and the CAF could + // have been GC'ed! (#26106) + // + // We call it here instead of in RTS C code, since we only + // want keepCAFs=1 for ghci, not user code. + this.exportFuncs.setKeepCAFs(); } init(); } View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/10f06163d9adcb3b6e6438f1524faaca... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/10f06163d9adcb3b6e6438f1524faaca... You're receiving this email because of your account on gitlab.haskell.org.