[GHC] #11830: Disabling idle GC leads to freeze
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime | Version: 8.0.1-rc3 System | Keywords: | Operating System: Linux Architecture: | Type of failure: Incorrect result Unknown/Multiple | at runtime Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I'm currently getting a runtime freeze with a spinning CPU with the latest GHC 8.0.1 RC (8.0.0.20160411). Testing 2 months ago on whatever was the latest release candidate showed no problems. The reproduction steps are a bit long winded: * All tested on Ubuntu Linux. * Checkout Shake, https://github.com/ndmitchell/shake.git (currently at 75505baa5fc5d1b99a1162edae6ecf7669f00ed9). * {{{cabal install}}} * Checkout Ninja, https://github.com/ninja-build/ninja.git (currently at 78f548880e549c701bd77760e4b3f3a4ee147641). * Change to the {{{ninja}}} directory. * Run {{{./configure.py --bootstrap}}} * Run {{{cp ninja nin}}} * Run {{{./nin -t clean}}} * Run {{{shake}}} Observe that Shake fails to complete and starts spinning on 1 CPU. If you modify {{{shake.cabal}}} to remove {{{-with-rtsopts=-I0 -qg -qb}}} then it works again and completes in < 1 min. Adding back flags with {{{+RTS -I0 -RTS}}} shows that {{{-I0}}} alone is the culprit. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by NeilMitchell): * cc: ndmitchell@… (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by NeilMitchell): Setting {{{-I1000}}}, when the computation takes < 20s, still succeeds. That seems to imply that the idle setting of 0 is the problem. Adding {{{-S}}} has the last line not being a GC. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by NeilMitchell): Using GHC HEAD (but not the latest release candidate) I also get a freeze when doing {{{shake --demo --keep-going}}}). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by kolmodin): * Attachment "check_test_case.sh" added. git bisect automation -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by kolmodin): git bisect from ghc-8.0.1-rc2 to latest commit in the ghc-8.0 branch suggests a few commits; - 15acd4227106ed912c8d6ebc476263f70cd4510c - 6e524ebaf299043990048356b01c045f2d6dc0d5 - 8e8b6df2e56389a1ed13d4198b1d2f3347706aaa - bbdc52f3a6e6a28e209fb8f65699121d4ef3a4e3 of which only bbdc52f3a6e6a28e209fb8f65699121d4ef3a4e3 looks likely. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by kolmodin): * cc: kolmodin (added) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonmar): * priority: normal => highest * milestone: => 8.0.1 Comment: Release blocker -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: patch Priority: highest | Milestone: 8.0.1 Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D2129 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => patch * differential: => Phab:D2129 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: patch Priority: highest | Milestone: 8.2.1 Component: Runtime System | Version: 8.0.1-rc3 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D2129 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * milestone: 8.0.1 => 8.2.1 Comment: The patch in question has been reverted on `ghc-8.0` (see #10840). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11830: Disabling idle GC leads to freeze
-------------------------------------+-------------------------------------
Reporter: NeilMitchell | Owner:
Type: bug | Status: patch
Priority: highest | Milestone: 8.2.1
Component: Runtime System | Version: 8.0.1-rc3
Resolution: | Keywords:
Operating System: Linux | Architecture:
Type of failure: Incorrect result | Unknown/Multiple
at runtime | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D2129
Wiki Page: |
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Comment (by Ben Gamari
#11830: Disabling idle GC leads to freeze -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: closed Priority: highest | Milestone: 8.2.1 Component: Runtime System | Version: 8.0.1-rc3 Resolution: fixed | Keywords: Operating System: Linux | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D2129 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: patch => closed * resolution: => fixed Comment: The commit in comment:9 isn't quite the whole story due to lacking synchronization. This is cleaned up in the rework of the itimer subsystem in 999c464da36e925bd4ffea34c94d3a7b3ab0135c (which also addresses #11965). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11830#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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