#14291: Tests tend to fail in the ext-interp way when split sections is enabled -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: 13716 Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Alright, so let's recap, When we enter `base_GHCziException_zdfShowErrorCallzuzdcshowsPrec_info` we have two perfectly valid looking arguments (an `I# 0` and a `ErrorCallWithLocation` constructor carrying a `:` constructor). From there we eventually jump to `base_GHCziException_zdwzdcshowsPrec1_info`, {{{#!hs GHC.Exception.$w$cshowsPrec1 [InlPrag=[0]] :: GHC.Base.String -> GHC.Base.String -> GHC.Show.ShowS }}} Here we have a reasonable-looking cons cell as the first argument. The second argument looked a bit suspicious at first but seems to check out {{{
ghc closure $rsi THUNK (0x415cf708) Ptr: off-heap(0x0) Ptr: off-heap(0x400c5ddb) ghc sym 0x415cf708 1216 bytes into base_GHCziException_prettyCallStack_info (starts at 0x415cf248) }}} This address appears to correspond to a certain `sat_s4i3 [Occ=Once] :: GHC.Base.String`
We eventually end up entering this thunk. In this thunk we perform a call to `base_GHCziStackziTypes_getCallStack_info` {{{ GHC.Stack.Types.getCallStack [Occ=LoopBreaker] :: GHC.Stack.Types.CallStack -> [([GHC.Types.Char], GHC.Stack.Types.SrcLoc)] }}} which is given a rather odd looking argument, {{{
print/a $r14 $13 = 0x400c5ddb x/8a $r14 & ~7 0x400c5dd8: 0x0 0x41453420 0x400c5de8: 0x0 0x414534c8 0x400c5df8: 0x0 0x41453520 }}} It looks like **this** is the first real sign of trouble.
which eventually leads to the crash when it we attempt an indirect jump to -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14291#comment:24 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler