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

[Christian Kellermann <Christian.Kellermann@nefkom.net>]

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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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