Sorry, here =====> recomp013(normal) 89 of 114 [0, 0, 0] cd ./recomp013 && $MAKE -s --no-print-directory recomp013 recomp013.run.stdout 2>recomp013.run.stderr Actual stdout output differs from expected: --- ./recomp013/recomp013.stdout 2013-09-18 12:38:22.000000000 +0100 +++ ./recomp013/recomp013.run.stdout 2013-09-19 12:15:22.611120935 +0100 @@ -3,5 +3,3 @@ [2 of 3] Compiling B ( B.hs, B.o ) [3 of 3] Compiling C ( C.hs, C.o ) second run -[2 of 3] Compiling B ( B.hs, B.o ) -[3 of 3] Compiling C ( C.hs, C.o ) [B changed] *** unexpected failure for recomp013(normal) | -----Original Message----- | From: Jan Stolarek [mailto:jan.stolarek@p.lodz.pl] | Sent: 19 September 2013 12:22 | To: Simon Peyton-Jones | Cc: ghc-devs@haskell.org; Joachim Breitner | Subject: Re: recomp013 | | Simon, I think you didn't paste the failure. | | Janek | | ----- Oryginalna wiadomość ----- | Od: "Simon Peyton-Jones" | Do: ghc-devs@haskell.org, "Joachim Breitner" | Wysłane: czwartek, 19 wrzesień 2013 12:17:29 | Temat: recomp013 | | | | I’m getting the failure below for recomp013.  Any ideas? It was added by | Joachim: | | | | commit b1f6cab360faf79d586eda8ee3c1c486e53d0066 | | Author: Joachim Breitner | | Date:   Tue Sep 17 22:37:51 2013 +0200 | | | |     Recompilation test case for #8247 | | | | Joachim: when you have a test for a ticket, please use “T8247” as the | test name.  Much easier to track back!  Thanks. | | | | Simon | | | | | | Microsoft Research Limited (company number 03369488) is registered in | England and Wales | | Registered office is at 21 Station Road, Cambridge, CB1 2FB | | | | _______________________________________________ | ghc-devs mailing list | ghc-devs@haskell.org | http://www.haskell.org/mailman/listinfo/ghc-devs

that makes it work.! | -----Original Message----- | From: Joachim Breitner [mailto:mail@joachim-breitner.de] | Sent: 19 September 2013 12:41 | To: Simon Peyton-Jones; ghc-devs@haskell.org | Subject: Re: recomp013 | | Dear Simon, | | Am Donnerstag, den 19.09.2013, 11:33 +0000 schrieb Simon Peyton-Jones: | > =====> recomp013(normal) 89 of 114 [0, 0, 0] | > cd ./recomp013 && $MAKE -s --no-print-directory recomp013 | recomp013.run.stdout 2>recomp013.run.stderr | > Actual stdout output differs from expected: | > --- ./recomp013/recomp013.stdout 2013-09-18 12:38:22.000000000 +0100 | > +++ ./recomp013/recomp013.run.stdout 2013-09-19 12:15:22.611120935 | +0100 | > @@ -3,5 +3,3 @@ | > [2 of 3] Compiling B ( B.hs, B.o ) | > [3 of 3] Compiling C ( C.hs, C.o ) | > second run | > -[2 of 3] Compiling B ( B.hs, B.o ) | > -[3 of 3] Compiling C ( C.hs, C.o ) [B changed] | > *** unexpected failure for recomp013(normal) | | It works here. So that means either two things: | * that the bug described in #8247 is actually present in HEAD, but | only under certain circumstances, or | * that there is a timing issue with the update of B.hs. | | The latter seems to be more likely. I notice that other recomp-tests | have a "sleep 1" before updating the file: If you insert that in | recomp013/Makefile, does it go through for you? | | Greetings, | Joachim | | -- | Joachim “nomeata” Breitner | mail@joachim-breitner.de • http://www.joachim-breitner.de/ | Jabber: nomeata@joachim-breitner.de • GPG-Key: 0x4743206C | Debian Developer: nomeata@debian.org

On 9/19/13, Simon Peyton-Jones wrote:

I lied. Whether or not the 'sleep' is there, the test usually fails, but occasionally (one time in ten or so) succeeds.

I am the originator of the bug report, and could consistently reproduce it in a bigger project. Unfortunately I have no time currently to dive into the issue, but I have it earmarked for later. Cheers, Gabor

SImon

| -----Original Message----- | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of Simon | Peyton-Jones | Sent: 19 September 2013 12:50 | To: Joachim Breitner; ghc-devs@haskell.org | Subject: RE: recomp013 | | that makes it work.! | | | -----Original Message----- | | From: Joachim Breitner [mailto:mail@joachim-breitner.de] | | Sent: 19 September 2013 12:41 | | To: Simon Peyton-Jones; ghc-devs@haskell.org | | Subject: Re: recomp013 | | | | Dear Simon, | | | | Am Donnerstag, den 19.09.2013, 11:33 +0000 schrieb Simon Peyton-Jones: | | > =====> recomp013(normal) 89 of 114 [0, 0, 0] | | > cd ./recomp013 && $MAKE -s --no-print-directory recomp013 | | recomp013.run.stdout 2>recomp013.run.stderr | | > Actual stdout output differs from expected: | | > --- ./recomp013/recomp013.stdout 2013-09-18 12:38:22.000000000 | +0100 | | > +++ ./recomp013/recomp013.run.stdout 2013-09-19 12:15:22.611120935 | | +0100 | | > @@ -3,5 +3,3 @@ | | > [2 of 3] Compiling B ( B.hs, B.o ) | | > [3 of 3] Compiling C ( C.hs, C.o ) | | > second run | | > -[2 of 3] Compiling B ( B.hs, B.o ) | | > -[3 of 3] Compiling C ( C.hs, C.o ) [B changed] | | > *** unexpected failure for recomp013(normal) | | | | It works here. So that means either two things: | | * that the bug described in #8247 is actually present in HEAD, but | | only under certain circumstances, or | | * that there is a timing issue with the update of B.hs. | | | | The latter seems to be more likely. I notice that other recomp-tests | | have a "sleep 1" before updating the file: If you insert that in | | recomp013/Makefile, does it go through for you? | | | | Greetings, | | Joachim | | | | -- | | Joachim “nomeata” Breitner | | mail@joachim-breitner.de • http://www.joachim-breitner.de/ | | Jabber: nomeata@joachim-breitner.de • GPG-Key: 0x4743206C | | Debian Developer: nomeata@debian.org | _______________________________________________ | ghc-devs mailing list | ghc-devs@haskell.org | http://www.haskell.org/mailman/listinfo/ghc-devs _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

No, it fails on Linux. Mostly but not invariably. Running it by hand (ie with TEST=recomp013) fails 9 times out of 10 and succeeds once. Weird. Simon | -----Original Message----- | From: Simon Marlow [mailto:marlowsd@gmail.com] | Sent: 23 September 2013 12:08 | To: Gabor Greif; Simon Peyton-Jones | Cc: Joachim Breitner; ghc-devs@haskell.org | Subject: Re: recomp013 | | Is it failing on Windows only? It could be an issue with the | granularity of timestamps. I think we use more accurate timestamps on | Linux nowadays, whereas Windows is still using 1 second granularity. If | that's the case, it probably needs a "sleep 1" somewhere. If the "sleep | 1" didn't help, perhaps it wasn't in the right place - it needs to be | before the second set of echo commands. | | On the subject of naming the test, we want two pieces of information in | the name: | - what it tests | - the ticket number, if it's a regression test | So rather than just renaming it to the ticket number (which would lose | the information that it's a recomp test), I suggest moving all the | recomp tests into their own directory first. It's really useful to have | all the tests for a component together, so you can run them quickly when | you're working on that component. | | Cheers, | Simon | | On 19/09/2013 08:57, Gabor Greif wrote: | > On 9/19/13, Simon Peyton-Jones wrote: | >> I lied. Whether or not the 'sleep' is there, the test usually fails, | but | >> occasionally (one time in ten or so) succeeds. | > | > I am the originator of the bug report, and could consistently | > reproduce it in a bigger project. Unfortunately I have no time | > currently to dive into the issue, but I have it earmarked for later. | > | > Cheers, | > | > Gabor | > | > | >> | >> SImon | >> | >> | -----Original Message----- | >> | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of | Simon | >> | Peyton-Jones | >> | Sent: 19 September 2013 12:50 | >> | To: Joachim Breitner; ghc-devs@haskell.org | >> | Subject: RE: recomp013 | >> | | >> | that makes it work.! | >> | | >> | | -----Original Message----- | >> | | From: Joachim Breitner [mailto:mail@joachim-breitner.de] | >> | | Sent: 19 September 2013 12:41 | >> | | To: Simon Peyton-Jones; ghc-devs@haskell.org | >> | | Subject: Re: recomp013 | >> | | | >> | | Dear Simon, | >> | | | >> | | Am Donnerstag, den 19.09.2013, 11:33 +0000 schrieb Simon Peyton- | Jones: | >> | | > =====> recomp013(normal) 89 of 114 [0, 0, 0] | >> | | > cd ./recomp013 && $MAKE -s --no-print-directory recomp013 | >> | | recomp013.run.stdout 2>recomp013.run.stderr | >> | | > Actual stdout output differs from expected: | >> | | > --- ./recomp013/recomp013.stdout 2013-09-18 12:38:22.000000000 | >> | +0100 | >> | | > +++ ./recomp013/recomp013.run.stdout 2013-09-19 | 12:15:22.611120935 | >> | | +0100 | >> | | > @@ -3,5 +3,3 @@ | >> | | > [2 of 3] Compiling B ( B.hs, B.o ) | >> | | > [3 of 3] Compiling C ( C.hs, C.o ) | >> | | > second run | >> | | > -[2 of 3] Compiling B ( B.hs, B.o ) | >> | | > -[3 of 3] Compiling C ( C.hs, C.o ) [B changed] | >> | | > *** unexpected failure for recomp013(normal) | >> | | | >> | | It works here. So that means either two things: | >> | | * that the bug described in #8247 is actually present in HEAD, | but | >> | | only under certain circumstances, or | >> | | * that there is a timing issue with the update of B.hs. | >> | | | >> | | The latter seems to be more likely. I notice that other recomp- | tests | >> | | have a "sleep 1" before updating the file: If you insert that in | >> | | recomp013/Makefile, does it go through for you? | >> | | | >> | | Greetings, | >> | | Joachim | >> | | | >> | | -- | >> | | Joachim "nomeata" Breitner | >> | | mail@joachim-breitner.de * http://www.joachim-breitner.de/ | >> | | Jabber: nomeata@joachim-breitner.de * GPG-Key: 0x4743206C | >> | | Debian Developer: nomeata@debian.org | >> | _______________________________________________ | >> | ghc-devs mailing list | >> | ghc-devs@haskell.org | >> | http://www.haskell.org/mailman/listinfo/ghc-devs | >> _______________________________________________ | >> ghc-devs mailing list | >> ghc-devs@haskell.org | >> http://www.haskell.org/mailman/listinfo/ghc-devs | >> | > _______________________________________________ | > ghc-devs mailing list | > ghc-devs@haskell.org | > http://www.haskell.org/mailman/listinfo/ghc-devs | >

I have the "sleep 1" in my tree, will commit after my next validate round. Cheers, Simon On 27/09/2013 10:14, Nicolas Frisby wrote:

The test as in the repo also fails on my Mac (18 out of 20 times in a row). Adding a 'sleep 1' before the second set of echo commands makes it succeed (20 out of 20 times in a row).

On Mon, Sep 23, 2013 at 7:43 AM, Simon Peyton-Jones mailto:simonpj@microsoft.com> wrote:

No, it fails on Linux. Mostly but not invariably. Running it by hand (ie with TEST=recomp013) fails 9 times out of 10 and succeeds once. Weird.

Simon

| -----Original Message----- | From: Simon Marlow [mailto:marlowsd@gmail.com mailto:marlowsd@gmail.com] | Sent: 23 September 2013 12:08 | To: Gabor Greif; Simon Peyton-Jones | Cc: Joachim Breitner; ghc-devs@haskell.org mailto:ghc-devs@haskell.org | Subject: Re: recomp013 | | Is it failing on Windows only? It could be an issue with the | granularity of timestamps. I think we use more accurate timestamps on | Linux nowadays, whereas Windows is still using 1 second granularity. If | that's the case, it probably needs a "sleep 1" somewhere. If the "sleep | 1" didn't help, perhaps it wasn't in the right place - it needs to be | before the second set of echo commands. | | On the subject of naming the test, we want two pieces of information in | the name: | - what it tests | - the ticket number, if it's a regression test | So rather than just renaming it to the ticket number (which would lose | the information that it's a recomp test), I suggest moving all the | recomp tests into their own directory first. It's really useful to have | all the tests for a component together, so you can run them quickly when | you're working on that component. | | Cheers, | Simon | | On 19/09/2013 08:57, Gabor Greif wrote: | > On 9/19/13, Simon Peyton-Jones mailto:simonpj@microsoft.com> wrote: | >> I lied. Whether or not the 'sleep' is there, the test usually fails, | but | >> occasionally (one time in ten or so) succeeds. | > | > I am the originator of the bug report, and could consistently | > reproduce it in a bigger project. Unfortunately I have no time | > currently to dive into the issue, but I have it earmarked for later. | > | > Cheers, | > | > Gabor | > | > | >> | >> SImon | >> | >> | -----Original Message----- | >> | From: ghc-devs [mailto:ghc-devs-bounces@haskell.org mailto:ghc-devs-bounces@haskell.org] On Behalf Of | Simon | >> | Peyton-Jones | >> | Sent: 19 September 2013 12:50 | >> | To: Joachim Breitner; ghc-devs@haskell.org mailto:ghc-devs@haskell.org | >> | Subject: RE: recomp013 | >> | | >> | that makes it work.! | >> | | >> | | -----Original Message----- | >> | | From: Joachim Breitner [mailto:mail@joachim-breitner.de mailto:mail@joachim-breitner.de] | >> | | Sent: 19 September 2013 12:41 | >> | | To: Simon Peyton-Jones; ghc-devs@haskell.org mailto:ghc-devs@haskell.org | >> | | Subject: Re: recomp013 | >> | | | >> | | Dear Simon, | >> | | | >> | | Am Donnerstag, den 19.09.2013, 11:33 +0000 schrieb Simon Peyton- | Jones: | >> | | > =====> recomp013(normal) 89 of 114 [0, 0, 0] | >> | | > cd ./recomp013 && $MAKE -s --no-print-directory recomp013 | >> | | recomp013.run.stdout 2>recomp013.run.stderr | >> | | > Actual stdout output differs from expected: | >> | | > --- ./recomp013/recomp013.stdout 2013-09-18 12:38:22.000000000 | >> | +0100 | >> | | > +++ ./recomp013/recomp013.run.stdout 2013-09-19 | 12:15:22.611120935 | >> | | +0100 | >> | | > @@ -3,5 +3,3 @@ | >> | | > [2 of 3] Compiling B ( B.hs, B.o ) | >> | | > [3 of 3] Compiling C ( C.hs, C.o ) | >> | | > second run | >> | | > -[2 of 3] Compiling B ( B.hs, B.o ) | >> | | > -[3 of 3] Compiling C ( C.hs, C.o ) [B changed] | >> | | > *** unexpected failure for recomp013(normal) | >> | | | >> | | It works here. So that means either two things: | >> | | * that the bug described in #8247 is actually present in HEAD, | but | >> | | only under certain circumstances, or | >> | | * that there is a timing issue with the update of B.hs. | >> | | | >> | | The latter seems to be more likely. I notice that other recomp- | tests | >> | | have a "sleep 1" before updating the file: If you insert that in | >> | | recomp013/Makefile, does it go through for you? | >> | | | >> | | Greetings, | >> | | Joachim | >> | | | >> | | -- | >> | | Joachim "nomeata" Breitner | >> | | mail@joachim-breitner.de mailto:mail@joachim-breitner.de * http://www.joachim-breitner.de/ | >> | | Jabber: nomeata@joachim-breitner.de mailto:nomeata@joachim-breitner.de * GPG-Key: 0x4743206C | >> | | Debian Developer: nomeata@debian.org mailto:nomeata@debian.org | >> | _______________________________________________ | >> | ghc-devs mailing list | >> | ghc-devs@haskell.org mailto:ghc-devs@haskell.org | >> | http://www.haskell.org/mailman/listinfo/ghc-devs | >> _______________________________________________ | >> ghc-devs mailing list | >> ghc-devs@haskell.org mailto:ghc-devs@haskell.org | >> http://www.haskell.org/mailman/listinfo/ghc-devs | >> | > _______________________________________________ | > ghc-devs mailing list | > ghc-devs@haskell.org mailto:ghc-devs@haskell.org | > http://www.haskell.org/mailman/listinfo/ghc-devs | > _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org mailto:ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs