RE: Windows build broken again: urgent - ghc-devs - Haskell.org

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RE: Windows build broken again: urgent

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GHC Weekly News - 2014/12/01

Simon Peyton Jones

1 Dec 2014 1 Dec '14

3:38 a.m.

| Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th? That seems very plausible, yes. But still there's the question of what to do about it. Simon | -----Original Message----- | From: Herbert Valerio Riedel [mailto:hvriedel@gmail.com] | Sent: 01 December 2014 08:37 | To: Simon Peyton Jones | Subject: Re: Windows build broken again: urgent | | On 2014-12-01 at 09:31:51 +0100, Simon Peyton Jones wrote: | > Alas. Alack. The Windows build is broken again. | > This time it's pretty fundamental: the stage2 compiler seg-faults | every time it invokes the linker: | > | > * On GHCi startup | > | > * On every Template Haskell splice | > | > I don't know when this started, but I did a successful build at | 23.10 on 24 November, so it's during the last week. | > I would gladly do any experiments if someone tells me what to do. | > It would be really good to fix this. At the moment I'm pretty much | stalled on laptop work. | | Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th?

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Herbert Valerio Riedel

1 Dec 1 Dec

3:43 a.m.

New subject: Windows build broken again: urgent

Hello Simon, On 2014-12-01 at 09:38:37 +0100, Simon Peyton Jones wrote:

| Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th?

That seems very plausible, yes. But still there's the question of what to do about it.

a) Empirically: Try locally 'git revert'ing 383733b9191a36e2d3f757700842dbc3855911d9 and/or b5e8b3b162b3ff15ae6caf1afc659565365f54a8 and see if your problem goes away, or b) Ask Simon Marlow (he either wrote or reviewed those two patches) if he sees something odd in those patches that could have broken Windows' GHCi... Cheers, hvr

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Johan Tibell

4:45 a.m.

New subject: Windows build broken again: urgent

In general I think a good course of action when this happens is: * Use git bisect to find the offending commit. This works now because we moved to submodules. * Revert the commit. * Push the patch to master and notify the author. This style of early rollback will become more important as we grow as it puts the onus on fixing on the right person and minimizes negative impact on other developers. On Dec 1, 2014 9:43 AM, "Herbert Valerio Riedel" wrote:

Hello Simon,

On 2014-12-01 at 09:38:37 +0100, Simon Peyton Jones wrote:

...
| Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th?

That seems very plausible, yes. But still there's the question of what to do about it.

a) Empirically: Try locally 'git revert'ing

383733b9191a36e2d3f757700842dbc3855911d9

and/or

b5e8b3b162b3ff15ae6caf1afc659565365f54a8

and see if your problem goes away, or

b) Ask Simon Marlow (he either wrote or reviewed those two patches) if he sees something odd in those patches that could have broken Windows' GHCi...

Cheers, hvr _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

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Simon Peyton Jones

10:34 a.m.

New subject: Windows build broken again: urgent

Indeed. But each bisect takes quite a while. So my attention switches and it takes a while to get back. I was hoping some machine might do it for me. Herbert suggested some commits to revert. I’ll try that first From: Johan Tibell [mailto:johan.tibell@gmail.com] Sent: 01 December 2014 09:45 To: Herbert Valerio Riedel Cc: ghc-devs@haskell.org; Simon Marlow; Simon Peyton Jones Subject: Re: Windows build broken again: urgent In general I think a good course of action when this happens is: * Use git bisect to find the offending commit. This works now because we moved to submodules. * Revert the commit. * Push the patch to master and notify the author. This style of early rollback will become more important as we grow as it puts the onus on fixing on the right person and minimizes negative impact on other developers. On Dec 1, 2014 9:43 AM, "Herbert Valerio Riedel" mailto:hvriedel@gmail.com> wrote: Hello Simon, On 2014-12-01 at 09:38:37 +0100, Simon Peyton Jones wrote:

| Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th?

That seems very plausible, yes. But still there's the question of what to do about it.

a) Empirically: Try locally 'git revert'ing 383733b9191a36e2d3f757700842dbc3855911d9 and/or b5e8b3b162b3ff15ae6caf1afc659565365f54a8 and see if your problem goes away, or b) Ask Simon Marlow (he either wrote or reviewed those two patches) if he sees something odd in those patches that could have broken Windows' GHCi... Cheers, hvr _______________________________________________ ghc-devs mailing list ghc-devs@haskell.orgmailto:ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

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Johan Tibell

1:01 p.m.

New subject: Windows build broken again: urgent

Yes, ideally this would have been caught by a Windows build bot. On Mon, Dec 1, 2014 at 4:34 PM, Simon Peyton Jones wrote:

Indeed. But each bisect takes quite a while. So my attention switches and it takes a while to get back. I was hoping some machine might do it for me.

Herbert suggested some commits to revert. I’ll try that first

*From:* Johan Tibell [mailto:johan.tibell@gmail.com] *Sent:* 01 December 2014 09:45 *To:* Herbert Valerio Riedel *Cc:* ghc-devs@haskell.org; Simon Marlow; Simon Peyton Jones *Subject:* Re: Windows build broken again: urgent

In general I think a good course of action when this happens is:

* Use git bisect to find the offending commit. This works now because we moved to submodules. * Revert the commit. * Push the patch to master and notify the author.

This style of early rollback will become more important as we grow as it puts the onus on fixing on the right person and minimizes negative impact on other developers.

On Dec 1, 2014 9:43 AM, "Herbert Valerio Riedel" wrote:

Hello Simon,

On 2014-12-01 at 09:38:37 +0100, Simon Peyton Jones wrote:

...
| Just a hunch... could it have been broken by one of the recent linker- | related patches since Nov 24th?

That seems very plausible, yes. But still there's the question of what to do about it.

a) Empirically: Try locally 'git revert'ing

383733b9191a36e2d3f757700842dbc3855911d9

and/or

b5e8b3b162b3ff15ae6caf1afc659565365f54a8

and see if your problem goes away, or

b) Ask Simon Marlow (he either wrote or reviewed those two patches) if he sees something odd in those patches that could have broken Windows' GHCi...

Cheers, hvr _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs

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Herbert Valerio Riedel
Johan Tibell
Simon Peyton Jones