June 2018 - ghc-tickets

[GHC] #15268: Clarify and test the interaction of -with-rtsopts and -rtsopts flags
by GHC 14 Jun '18

14 Jun '18

#15268: Clarify and test the interaction of -with-rtsopts and -rtsopts flags -------------------------------------+------------------------------------- Reporter: osa1 | Owner: (none) Type: task | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.5 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Looking at the user manual it's not clear how do `-with-rtsopts` and `-rtsopts` flags interact. I'd expect `-with-rtsopts` to work even with `-rtsopts=ignoreAll`, but I don't know if this is really the case, and because we don't have a way to print RTS flags (see #15261 for this) it's hard to make sure this works as expected. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15268> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #14601: Remove uses of unsafeGlobalDynFlags for -fopt-coercions
by GHC 14 Jun '18

14 Jun '18

#14601: Remove uses of unsafeGlobalDynFlags for -fopt-coercions -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Currently the `-fopt-coercions` flag finds its way to `OptCoercion.optCoercion` by way of the terrible `unsafeGlobalDynFlags`. In general it's nice to minimize the uses of `unsafeGlobalDynFlags`. However, it's not entirely clear that passing a `DynFlags` to `optCoercion` is worthwhile in this case as `-fopt-coercion` is essentially a debug flag. Leaving this here for later consideration. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14601> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #14392: `make binary-dist` is broken
by GHC 14 Jun '18

14 Jun '18

#14392: `make binary-dist` is broken -------------------------------------+------------------------------------- Reporter: Fuuzetsu | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- If we run {{{#!bash ./boot ./configure make make binary-dist }}} We are soon greeted with the following error {{{ cd bindistprep && "/bin/tar" hcf - -T ../bindist-list.uniq | /usr/bin/xz -c > ../bindistprep/ghc-8.3.20171025-x86_64-unknown-linux.tar.xz /bin/tar: ghc-8.3.20171025/testsuite/utils/check-api-annotations/dist- install/build/.depend.c_asm: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-api-annotations/dist- install/build/.depend.haskell: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-api-annotations/dist- install/package-data.mk: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-api-annotations/ghc.mk: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-ppr/dist- install/build/.depend.c_asm: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-ppr/dist- install/build/.depend.haskell: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-ppr/dist-install/package- data.mk: Cannot stat: No such file or directory /bin/tar: ghc-8.3.20171025/testsuite/utils/check-ppr/ghc.mk: Cannot stat: No such file or directory /bin/tar: Exiting with failure status due to previous errors mv bindistprep/*.tar.xz "." }}} I suspect https://github.com/ghc/ghc/commit/1e9f90af7311c33de0f7f5b7dba594725596d675 is to blame: bindist was not updated. A temporary work around I'm using is {{{ + $(filter-out testsuite/utils/check-ppr/% testsuite/utils/check-api- annotations/% %/project.mk mk/config.mk %/mk/install.mk,$(MAKEFILE_LIST)) \ }}} in top level {{{ghc.mk}}} in {{{bindist-list}}} {{{eval}}} section. I have reported this in #ghc to Ben but I am creating this ticket such that we can track the progress. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14392> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #14492: Tiered memory allocation restricts available memory
by GHC 14 Jun '18

14 Jun '18

#14492: Tiered memory allocation restricts available memory -------------------------------------+------------------------------------- Reporter: unode | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 8.0.2 System | Keywords: memory ulimit | Operating System: Linux Architecture: x86_64 | Type of failure: Poor/confusing (amd64) | error message Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This was first noticed when running a binary produced with GHC 8.0.2 through a queueing system (Sun Grid Engine) that limits available memory by setting `ulimit -v`. When running with **unlimited** address space, the binary reserves 1TB of RAM and everything works as expected. When running with **limited** address space, reservation happens in powers of 2 leading to significant unused memory at higher memory values. The tests are summarized in the following table: {{{ Limit VIRT Unused (all in GB) 8 4 8 10 8 2 16 8 8 32 16 16 34 32 2 64 32 32 66 64 2 128 64 64 130 128 2 256 128 128 258 256 2 512 256 256 514 512 2 1024 512 512 }}} In the last line, setting `ulimit -v` to 1024GB (1073741824) causes the binary to only be able to reserve 512GB. If at runtime the software needs more than 512GB it will abort with "out of memory" instead of expanding to as close to the specified ulimit as possible. PS: Is there any way to make the "out of memory" error a little bit more informative? Something that informs the user of how much memory was already being used and how much more was going to be reserved when the failure was seen? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14492> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #15228: Remove use of showSDocUnsafe in extending_ghc.rst
by GHC 14 Jun '18

14 Jun '18

#15228: Remove use of showSDocUnsafe in extending_ghc.rst -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: task | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Keywords: newcomer | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- There are lots of usages of `showSDocUnsafe` in `extending_ghc.rst`. However, they are all unnecessary as far as I could see because the `Hsc` or `TcM` context has a copy of `DynFlags` in it. It should be possible to replace them all with `showSDoc`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15228> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #15240: GHCi's :doc doesn't find the documentation for some class methods
by GHC 14 Jun '18

14 Jun '18

#15240: GHCi's :doc doesn't find the documentation for some class methods -------------------------------------+------------------------------------- Reporter: sjakobi | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: GHCi | Version: 8.5 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Other Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- While `:doc` reliably finds the docs for classes like Foldable and Monad, it fails for some methods. {{{ λ :doc return Inject a value into the monadic type. λ :doc foldr <has no documentation> λ :doc show <has no documentation> }}} So far I haven't been able to see a pattern there. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15240> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #15180: Make Control.Exception.throw levity polymorphic
by GHC 14 Jun '18

14 Jun '18

#15180: Make Control.Exception.throw levity polymorphic -------------------------------------+------------------------------------- Reporter: andrewthad | Owner: (none) Type: task | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Unknown/Multiple LevityPolymorphism | Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The `error` function has a levity-polymorphic type. I propose that the same be done for `throw`. I just encountered a situation where I needed this, and instead of calling `throw x`, I had to call `raise# (toException x)` because `throw` is unnecessarily restrictive. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15180> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11259: Use system runtime linker in GHCi on PowerPC 64 bit
by GHC 14 Jun '18

14 Jun '18

#11259: Use system runtime linker in GHCi on PowerPC 64 bit -------------------------------------+------------------------------------- Reporter: trommler | Owner: trommler Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: GHCi | Version: 7.11 Keywords: | Operating System: Linux Architecture: powerpc64 | Type of failure: GHCi crash Test Case: ghcilink004, | Blocked By: prog001, and 11 more | Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Teach GHCi to use the system runtime linker to load Haskell libraries on powerpc64. See the following test failures. ghcilink004: {{{ ghc-stage2: dir004/libfoo.a: unknown architecture (e_machine == 21) ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.11.20151219 for powerpc64-unknown-linux): loadArchive "dir004/libfoo.a": failed CallStack (from ImplicitParams): error, called at libraries/ghci/GHCi/ObjLink.hs:91:21 in ghci-0.0:GHCi.ObjLink Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} prog001: {{{ ghc-iserv.bin: /home/peter/ghc/libraries/ghc-prim/dist-install/build /libHSghc-prim-0.5.0.0.a: unknown architecture (e_machine == 21) ghc-iserv.bin: loadArchive "/home/peter/ghc/libraries/ghc-prim/dist- install/build/libHSghc-prim-0.5.0.0.a": failed CallStack (from ImplicitParams): error, called at libraries/ghci/GHCi/ObjLink.hs:91:21 in ghci-0.0:GHCi.ObjLink ghc-stage2: ghc-iserv terminated (1) }}} Using the system runtime linker fixes 13 failing tests. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11259> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #13634: num009 fails on POWER8
by GHC 14 Jun '18

14 Jun '18

#13634: num009 fails on POWER8 -------------------------------------+------------------------------------- Reporter: trommler | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: | Version: 8.1 libraries/base | Keywords: | Operating System: Linux Architecture: powerpc64 | Type of failure: Incorrect result Test Case: | at runtime libraries/base/tests/Numeric/num009| Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- This failure is produced on a POWER8 running openSUSE Leap 42.2 for powerpc64le: {{{ +uh oh! tanf 1.5707964 +-2.2877334e7 +-2.2877332e7 +(-11438667,1) +(-11438666,1) Done }}} The test passes on a PowerPC 970MP (PowerMac G5) running openSUSE 13.2 powerpc64 (big endian). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13634> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #12903: SIGINT is not handled in forked process
by GHC 14 Jun '18

14 Jun '18

#12903: SIGINT is not handled in forked process -------------------------------------+------------------------------------- Reporter: qnikst | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 8.0.1 System | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- If haskell program is forked in a toplevel hander that sends UserInterrupt in the main thread doesn't work, because Thread 1 doesn't exists in forked program, so that action is noop. Minimal example: {{{#!hs import Control.Concurrent import Control.Exception import System.Posix main = do pid <- forkProcess $ do handle (\UserInterrupt{} -> putStrLn "caught") $ threadDelay 2000000 signalProcess sigINT pid threadDelay 2000000 }}} Expected result: "caught" printed to stdout. Actual result: nothing is printed. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12903> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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