Stack traces in ghci

Thu Dec 8 13:20:26 UTC 2016

I created a ticket: https://ghc.haskell.org/trac/ghc/ticket/12946

On 7 December 2016 at 16:37, <dominic at steinitz.org> wrote:

> Hi Simon,
>
> Thanks for getting back.
>
> 1. Without -prof and -fexternal-interpreter, the program runs fine.
>
> 2. With just -prof, the program runs fine.
>
> 3. With just -fexternal-interpreter, I get the error below.
>
> Dominic.
>
> On 7 Dec 2016, at 13:52, Simon Marlow <marlowsd at gmail.com> wrote:
>
> Hi Dominic - this looks like a problem with loading hmatrix into GHCi.
> Does it load without -prof and -fexternal-interpreter?  How about with just
> -fexternal-interpreter?
>
> Cheers
> SImon
>
> On 5 December 2016 at 12:20, Dominic Steinitz <dominic at steinitz.org>
> wrote:
>
>> I am trying to debug a package in which there is a divide by 0 error and
>> attempting to use Simon Marlow’s stack traces:
>> https://simonmar.github.io/posts/2016-02-12-Stack-traces-in-GHCi.html.
>> However ghci is complaining about  missing symbols. What do I need to add
>> to the command line to coax ghci into giving me a stack trace?
>>
>> > ~/Dropbox/Private/Stochastic/demo $ ghci -fexternal-interpreter -prof
>> fe-handling-example.o -i../../monad-bayes/src
>> -package-db=.cabal-sandbox/x86_64-osx-ghc-8.0.1-packages.conf.d
>> > GHCi, version 8.0.1: http://www.haskell.org/ghc/  :? for help
>> > Prelude> :l app/Main.hs
>> > [ 1 of 16] Compiling Control.Monad.Bayes.LogDomain (
>> ../../monad-bayes/src/Control/Monad/Bayes/LogDomain.hs, interpreted )
>> > [ 2 of 16] Compiling Control.Monad.Bayes.Primitive (
>> ../../monad-bayes/src/Control/Monad/Bayes/Primitive.hs, interpreted )
>> > [ 3 of 16] Compiling Control.Monad.Bayes.Class (
>> ../../monad-bayes/src/Control/Monad/Bayes/Class.hs, interpreted )
>> > [ 4 of 16] Compiling Control.Monad.Bayes.Sampler (
>> ../../monad-bayes/src/Control/Monad/Bayes/Sampler.hs, interpreted )
>> > [ 5 of 16] Compiling Control.Monad.Bayes.Sequential (
>> ../../monad-bayes/src/Control/Monad/Bayes/Sequential.hs, interpreted )
>> > [ 6 of 16] Compiling Control.Monad.Bayes.Prior (
>> ../../monad-bayes/src/Control/Monad/Bayes/Prior.hs, interpreted )
>> > [ 7 of 16] Compiling Control.Monad.Bayes.Rejection (
>> ../../monad-bayes/src/Control/Monad/Bayes/Rejection.hs, interpreted )
>> > [ 8 of 16] Compiling Control.Monad.Bayes.Weighted (
>> ../../monad-bayes/src/Control/Monad/Bayes/Weighted.hs, interpreted )
>> > [ 9 of 16] Compiling Control.Monad.Bayes.Population (
>> ../../monad-bayes/src/Control/Monad/Bayes/Population.hs, interpreted )
>> > [10 of 16] Compiling Control.Monad.Bayes.Deterministic (
>> ../../monad-bayes/src/Control/Monad/Bayes/Deterministic.hs, interpreted )
>> > [11 of 16] Compiling Control.Monad.Bayes.Conditional (
>> ../../monad-bayes/src/Control/Monad/Bayes/Conditional.hs, interpreted )
>> > [12 of 16] Compiling Control.Monad.Bayes.Dist (
>> ../../monad-bayes/src/Control/Monad/Bayes/Dist.hs, interpreted )
>> > [13 of 16] Compiling Control.Monad.Bayes.Coprimitive (
>> ../../monad-bayes/src/Control/Monad/Bayes/Coprimitive.hs, interpreted )
>> > [14 of 16] Compiling Control.Monad.Bayes.Trace (
>> ../../monad-bayes/src/Control/Monad/Bayes/Trace.hs, interpreted )
>> > [15 of 16] Compiling Control.Monad.Bayes.Inference (
>> ../../monad-bayes/src/Control/Monad/Bayes/Inference.hs, interpreted )
>> > [16 of 16] Compiling Main             ( app/Main.hs, interpreted )
>> >
>> > app/Main.hs:92:7: warning: [-Wunused-matches]
>> >     Defined but not used: ‘a’
>> >
>> > app/Main.hs:92:9: warning: [-Wunused-matches]
>> >     Defined but not used: ‘prevP’
>> >
>> > app/Main.hs:92:15: warning: [-Wunused-matches]
>> >     Defined but not used: ‘prevZ’
>> >
>> > app/Main.hs:106:5: warning: [-Wunused-do-bind]
>> >     A do-notation statement discarded a result of type ‘GHC.Prim.Any’
>> >     Suppress this warning by saying
>> >       ‘_ <- ($)
>> >               error (++) "You are here " (++) show state (++) " " show
>> p_obs’
>> > Ok, modules loaded: Main, Control.Monad.Bayes.LogDomain,
>> Control.Monad.Bayes.Primitive, Control.Monad.Bayes.Class,
>> Control.Monad.Bayes.Population, Control.Monad.Bayes.Conditional,
>> Control.Monad.Bayes.Inference, Control.Monad.Bayes.Sampler,
>> Control.Monad.Bayes.Rejection, Control.Monad.Bayes.Weighted,
>> Control.Monad.Bayes.Sequential, Control.Monad.Bayes.Trace,
>> Control.Monad.Bayes.Dist, Control.Monad.Bayes.Prior,
>> Control.Monad.Bayes.Deterministic, Control.Monad.Bayes.Coprimitive.
>> > *Main> main
>> > ghc-iserv-prof:
>> > lookupSymbol failed in relocateSection (relocate external)
>> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-sandbox/
>> lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKY
>> NyM4UGAPZ/libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown
>> symbol `___ieee_divdc3'
>> > ghc-iserv-prof: Could not on-demand load symbol '_vectorScan'
>> >
>> > ghc-iserv-prof:
>> > lookupSymbol failed in relocateSection (relocate external)
>> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-sandbox/
>> lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKY
>> NyM4UGAPZ/libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown
>> symbol `_vectorScan'
>> > ghc-iserv-prof: Could not on-demand load symbol
>> '_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziVe
>> ctorizzed_constantAux_closure'
>> >
>> > ghc-iserv-prof:
>> > lookupSymbol failed in relocateSection (relocate external)
>> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-sandbox/
>> lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKY
>> NyM4UGAPZ/libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown
>> symbol `_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziVe
>> ctorizzed_constantAux_closure'
>> > ghc-iserv-prof: Could not on-demand load symbol
>> '_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziMa
>> trix_Matrix_con_info'
>> >
>> > ghc-iserv-prof:
>> > lookupSymbol failed in relocateSection (relocate external)
>> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-sandbox/
>> lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKY
>> NyM4UGAPZ/libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown
>> symbol `_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziMa
>> trix_Matrix_con_info'
>> > ghc-iserv-prof: Could not on-demand load symbol
>> '_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziEl
>> ement_zgzl_info'
>> >
>> > ghc-iserv-prof:
>> > lookupSymbol failed in relocateSection (relocate external)
>> > /Users/dom/Dropbox/Private/Stochastic/demo/.cabal-sandbox/
>> lib/x86_64-osx-ghc-8.0.1/hmatrix-0.18.0.0-7aYEqJARQEvKY
>> NyM4UGAPZ/libHShmatrix-0.18.0.0-7aYEqJARQEvKYNyM4UGAPZ_p.a: unknown
>> symbol `_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziEl
>> ement_zgzl_info'
>> > ghc-iserv-prof: Could not on-demand load symbol
>> '_hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziUt
>> il_zdfIndexableVectorDouble_closure'
>> >
>> >
>> > ByteCodeLink.lookupCE
>> > During interactive linking, GHCi couldn't find the following symbol:
>> >   hmatrixzm0zi18zi0zi0zm7aYEqJARQEvKYNyM4UGAPZZ_InternalziUtil
>> _zdfIndexableVectorDouble_closure
>> > This may be due to you not asking GHCi to load extra object files,
>> > archives or DLLs needed by your current session.  Restart GHCi,
>> specifying
>> > the missing library using the -L/path/to/object/dir and -lmissinglibname
>> > flags, or simply by naming the relevant files on the GHCi command line.
>> > Alternatively, this link failure might indicate a bug in GHCi.
>> > If you suspect the latter, please send a bug report to:
>> >   glasgow-haskell-bugs at haskell.org
>>
>>
>>
>> Dominic Steinitz
>> dominic at steinitz.org
>> http://idontgetoutmuch.wordpress.com
>>
>> _______________________________________________
>> Glasgow-haskell-users mailing list
>> Glasgow-haskell-users at haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users
>>
>
>
> Dominic Steinitz
> dominic at steinitz.org
> http://idontgetoutmuch.wordpress.com
>
>
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