#8935: Obscure linker bug leads to crash in GHCi -------------------------------------+------------------------------------ Reporter: simonmar | Owner: simonmar Type: bug | Status: infoneeded Priority: high | Milestone: 7.8.3 Component: Runtime System | Version: 7.8.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: GHCi crash | Difficulty: Rocket Science Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by trommler): I have the following fix in mind: In `internal_dlsym` search the default handle first and then the list of SOs opened so far. But there are a few things in `Linker.c` that I don't understand yet: 1. `hdl` is `dl_prog_handle` in all two call sites. Do we need that parameter or could we instead use the static variable `dl_prog_handle` directly? 1. With `hdl` being `dl_prog_handle`: In `internal_dlsym` the SO pointed to by `hdl` is searched last. Why can I not look there first? 1. In `internal_dlopen` the SO is opened with `RTLD_GLOBAL` but we want to be able to override symbols later when we reload a library. Why is `RTLD_GLOBAL` needed? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8935#comment:27 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler