[9fans] p9p acme freezes on devdraw read in MacOS X

Dear List,

I am experiencing a strange behaviour of p9p acme: When I scroll
with the mouse wheel acme just hangs. The console prints acme: bad
rpc tag 2 (no one waiting on that tag)

attaching with gdb says:

0x9526a1b5 in read$UNIX2003 ()
(gdb) bt
#0 0x9526a1b5 in read$UNIX2003 ()
#1 0x000089e7 in threadmain ()
#2 0x0001aeac in threadmainstart (v=0x0) at thread.c:699
#3 0x0001a808 in threadstart (y=552960, x=0) at thread.c:95

and detaching makes acme crash completely with

settag/send tag 3: Broken pipe
settag/send tag 3: Broken pipe
Oct 8 10:27:23.908 write error: Broken pipe
settag/send tag 3: Broken pipe

Has any one else seen this? It feels like a race condition since I
cannot reproduce it reliably other than opening a window with some
content and scrolling around with the mouse wheel. I have tried to
pull from the repo but it seems that

changeset: 2915:dd72218f97d9
tag: tip
user: Russ Cox <rsc@swtch.com>
date: Thu Aug 14 10:29:29 2008 -0400
summary: rc: fix local variables in functions

is the latest tip.

What can I do to help debugging this? It is really an annoying bug
I must say.

Thanks for your insights,

Christian

--
You may use my gpg key for replies:
pub 1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)

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Greetings,
I have been using a scroll wheel in p9p's acme on OS-X for some time without
any problems.
This raises a few questions about your setup:

1) Are you sure you are running the new, native gui version? Your hg info
suggests this is the case, but I want to make sure you recompiled the
binaries between now and then.
2) What kind of mouse is is?
3) Does the scroll wheel behave normally in other apps on OS-X?
4) Are you using any non-standard mouse drivers?
5) If you are on a laptop, does scrolling with the touchpad cause this
error?

--underspecified

On Wed, Oct 8, 2008 at 5:36 PM, Christian Kellermann <
[email]Christian.Kellermann@nefkom.net[/email]> wrote:
[color=blue]
> Dear List,
>
> I am experiencing a strange behaviour of p9p acme: When I scroll
> with the mouse wheel acme just hangs. The console prints acme: bad
> rpc tag 2 (no one waiting on that tag)
>
> attaching with gdb says:
>
> 0x9526a1b5 in read$UNIX2003 ()
> (gdb) bt
> #0 0x9526a1b5 in read$UNIX2003 ()
> #1 0x000089e7 in threadmain ()
> #2 0x0001aeac in threadmainstart (v=0x0) at thread.c:699
> #3 0x0001a808 in threadstart (y=552960, x=0) at thread.c:95
>
> and detaching makes acme crash completely with
>
> settag/send tag 3: Broken pipe
> settag/send tag 3: Broken pipe
> Oct 8 10:27:23.908 write error: Broken pipe
> settag/send tag 3: Broken pipe
>
> Has any one else seen this? It feels like a race condition since I
> cannot reproduce it reliably other than opening a window with some
> content and scrolling around with the mouse wheel. I have tried to
> pull from the repo but it seems that
>
> changeset: 2915:dd72218f97d9
> tag: tip
> user: Russ Cox <rsc@swtch.com>
> date: Thu Aug 14 10:29:29 2008 -0400
> summary: rc: fix local variables in functions
>
> is the latest tip.
>
> What can I do to help debugging this? It is really an annoying bug
> I must say.
>
> Thanks for your insights,
>
> Christian
>
> --
> You may use my gpg key for replies:
> pub 1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)
>[/color]

* underspecified <underspecified@gmail.com> [081008 13:26]:[color=blue]
> 1) Are you sure you are running the new, native gui version? Your hg info
> suggests this is the case, but I want to make sure you recompiled the
> binaries between now and then.[/color]
Yes I do run native and I rebuild everything just to make sure.
[color=blue]
> 2) What kind of mouse is is?[/color]
A standard USB Logitech mouse
[color=blue]
> 3) Does the scroll wheel behave normally in other apps on OS-X?[/color]
Yep.
[color=blue]
> 4) Are you using any non-standard mouse drivers?[/color]
No.
[color=blue]
> 5) If you are on a laptop, does scrolling with the touchpad cause this
> error?[/color]
I cannot reproduce that with the touchpad, but I am not sure if that reallymatters...


HTH,

Christian

--
You may use my gpg key for replies:
pub 1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)

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Version: GnuPG v1.4.8 (OpenBSD)

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ixkAoJOF8DhB/mFCOOqin6Imx0TMBUTO
=kh9f
-----END PGP SIGNATURE-----

Greetings,
On Wed, Oct 8, 2008 at 8:40 PM, Christian Kellermann <
[email]Christian.Kellermann@nefkom.net[/email]> wrote:
[color=blue]
> * underspecified <underspecified@gmail.com> [081008 13:26]:[color=green]
> > 1) Are you sure you are running the new, native gui version? Your hg info
> > suggests this is the case, but I want to make sure you recompiled the
> > binaries between now and then.[/color]
> Yes I do run native and I rebuild everything just to make sure.
>[color=green]
> > 2) What kind of mouse is is?[/color]
> A standard USB Logitech mouse
>[color=green]
> > 3) Does the scroll wheel behave normally in other apps on OS-X?[/color]
> Yep.
>[color=green]
> > 4) Are you using any non-standard mouse drivers?[/color]
> No.
>[color=green]
> > 5) If you are on a laptop, does scrolling with the touchpad cause this
> > error?[/color]
> I cannot reproduce that with the touchpad, but I am not sure if that really
> matters...[/color]


In principle the scroll wheel and touchpad should be sending the same events
when scrolling,
so if it fails with just the mouse, I think the problem is more likely to be
specific to that mouse.
Have you tried any other mice? My Lenovo 3-button mouse and Logitec 3-button
mouse scroll
fine.

What version of OS-X are you running?

--underspecified

HTH,[color=blue]
>
> Christian
>
> --
> You may use my gpg key for replies:
> pub 1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)
>[/color]

* underspecified <underspecified@gmail.com> [081008 14:14]:[color=blue]
>
> In principle the scroll wheel and touchpad should be sending the same events
> when scrolling,
> so if it fails with just the mouse, I think the problem is more likely tobe
> specific to that mouse.
> Have you tried any other mice? My Lenovo 3-button mouse and Logitec 3-button
> mouse scroll
> fine.[/color]

I agree, I have tried several different usb mice, and in the meantime
can provoke the error with the touchpad as well. It seems that
wildly selecting text also triggers the behaviour. This is strange...

I am using 10.5.5 on a MacBook Pro...

HTH,

Christian

--
You may use my gpg key for replies:
pub 1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)

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Version: GnuPG v1.4.8 (OpenBSD)

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I have tracked this down along with another OS X display problem.
I will push out the fix later today.

Russ

On Wed, Oct 8, 2008 at 1:41 PM, Russ Cox <rsc@swtch.com> wrote:[color=blue]
> I have tracked this down along with another OS X display problem.
> I will push out the fix later today.[/color]

This fix and the resize fix is now in hg and cvs.

Russ

The fixes work very well. Thank you.

On Wed, Oct 8, 2008 at 5:05 PM, Russ Cox <rsc@swtch.com> wrote:[color=blue]
> On Wed, Oct 8, 2008 at 1:41 PM, Russ Cox <rsc@swtch.com> wrote:[color=green]
>> I have tracked this down along with another OS X display problem.
>> I will push out the fix later today.[/color]
>
> This fix and the resize fix is now in hg and cvs.
>
> Russ
>
>[/color]