[GHC] #10737: GHC panic durring MVar operation
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Windows Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- The following error message was displayed while loading a program into ghci by executing `:r` in a ghci session: {{{ ghc.exe: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-mingw32): thread blocked indefinitely in an MVar operation Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} The only edit made to the source file before compiling was the removal of an unnecessary `do` on line 20 of the source file. The `do` was used even though the monodic computations were written in a single line style. I have not been able to reproduce the panic at all. The source file, unedited since the panic, now compiles without error. The ghci session leading up to the crash is below {{{ *Main> :t runState (filterM untouchable [1..3]) M.empty runState (filterM untouchable [1..3]) M.empty :: ([Int], M.Map Int Int) *Main> runState (filterM untouchable [1..3]) M.empty ([2],fromList [(1,1),(2,1),(3,1),(4,3)]) *Main> runState (filterM untouchable [1..10]) M.empty ([2,5],fromList [(1,1),(2,1),(3,1),(4,3),(5,1),(6,6),(7,1),(8,7),(9,4),(10,8),(11,1),(12,16),(13,1),(14,10),(15,9),(16,15),(17,1),(18,21),(19,1),(20,22),(21,11),(22,14),(23,1),(24,36),(25,6),(26,16),(27,13),(28,28),(29,1),(30,42),(31,1),(32,31),(33,15),(34,20),(35,13),(36,55),(37,1),(38,22),(39,17),(40,50),(41,1),(42,54),(43,1),(44,40),(45,33),(46,26),(47,1),(48,76),(49,8),(50,43),(51,21),(52,46),(53,1),(54,66),(55,17),(56,64),(57,23),(58,32),(59,1),(60,108),(61,1),(62,34),(63,41),(64,63),(65,19),(66,78),(67,1),(68,58),(69,27),(70,74),(71,1)(72,123),(73,1),(74,40),(75,49),(76,64),(77,19),(78,90),(79,1),(80,106),(81,40)]) *Main> runState (filterM untouchable [1..100]) M.empty ([2,5,52,88Interrupted. *Main> *Main> *Main> *Main> *Main> *Main> *Main> *Main> *Main> :r [1 of 1] Compiling Main ( C:\Users\admin\Programming\Haskell\codegolf\Untouchable.hs, interpreted ) Ok, modules loaded: Main. *Main> ghc.exe: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-mingw32): thread blocked indefinitely in an MVar operation Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by dohaqatar7): * Attachment "Untouchable.hs" added. Source file in question -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #4245 | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * related: => #4245 Comment: Might be the same underlying cause as #4245, although that ticket deals mostly with control-C in GHCi on Windows and Mac resulting in the same error message. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.8.3 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #4245 | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * component: Compiler => GHCi -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.8.3 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #4245, #9940 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by rdragon): * related: #4245 => #4245, #9940 Comment: Replying to [comment:1 thomie]:
Might be the same underlying cause as #4245, although that ticket deals mostly with control-C in GHCi on Windows and Mac resulting in the same error message. Looks like Ctrl-C is also at play here, judging the `Interrupted` message above the `:r` command. This would also explain why dohaqatar7 was not able to reproduce the crash.
-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#10737: GHC panic durring MVar operation -------------------------------------+------------------------------------- Reporter: dohaqatar7 | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 7.8.3 Resolution: duplicate | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: #4245, #9940 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by thomie): * status: new => closed * resolution: => duplicate Comment: Replying to [comment:3 rdragon]:
Looks like Ctrl-C is also at play here, judging the `Interrupted` message above the `:r` command. This would also explain why dohaqatar7 was not able to reproduce the crash.
Ah, you're right. Let's close this one as a duplicate of #9940 as well then. Thanks for reporting, dohaqatar7. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10737#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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