From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 10664@debbugs.gnu.org
Subject: bug#10664: 24.0.93; JIT font-lock infloops in a C file
Date: Mon, 6 Feb 2012 11:09:57 +0000 [thread overview]
Message-ID: <20120206110957.GA2731@acm.acm> (raw)
In-Reply-To: <83bopdcfe5.fsf@gnu.org>
Hi, Eli.
On Sun, Feb 05, 2012 at 08:18:58PM +0200, Eli Zaretskii wrote:
> > Date: Mon, 30 Jan 2012 20:23:49 +0200
> > From: Eli Zaretskii <eliz@gnu.org>
> > I don't have a recipe starting from "emacs -Q", sorry.
> > I left my freshly built Emacs 24.0.93 running, and when I returned to
> > it a few hours later, I found it unresponsive, endlessly showing in
> > the echo area "JIT lock socket.c", interspersed with GC messages
> > (I have garbage-collection-messages set non-nil).
> > Breaking into Emacs with a debugger produced the backtrace below (it's
> > an optimized build, so the backtrace may be inaccurate, sorry). I
> > attach the file socket.c (part of the Guile sources) as well.
I got something similar for this socket.c. I load it into emacs -Q, then
start scrolling downwards, a page at a time. The first five scrolls are
fine. Then it hangs on the sixth.
However, typing C-g (maybe twice) frees it up, and it does the scroll.
Careful perusal reveals that the fontification is incomplete. From now
on, most key sequences must be followed by C-g to perform their commands.
;-(.
Did you actually try C-g when your session hung?
I was able to run elp on this, and I've a fairly good idea where it's got
stuck, but not yet why.
> > I still have that session in a debugger, so if someone wants me to
> > look around and show some values, I can do that.
I'm not sure I'd be able to make much out of debugger results. I'm not
familiar enough with the internals of Emacs. :-(
Can you restart this Emacs session? If so, could you try out C-g
(assuming you haven't already done so).
> > Lisp Backtrace:
> > "c-in-knr-argdecl" (0x82df24)
> > "byte-code" (0x82e030)
> > "c-beginning-of-decl-1" (0x82e2d4)
> > "c-set-fl-decl-start" (0x82e444)
> > "c-context-set-fl-decl-start" (0x82e5b4)
> > 0x4264f80 PVEC_COMPILED
> > "mapc" (0x82e874)
> > "c-font-lock-fontify-region" (0x82e9e4)
> > "font-lock-fontify-region" (0x82ec68)
> > "run-hook-with-args" (0x82ec64)
> > "byte-code" (0x82ed60)
> > "jit-lock-fontify-now" (0x82f034)
> > "jit-lock-stealth-fontify" (0x82f278)
> > "apply" (0x82f274)
> > "byte-code" (0x82f370)
> > "timer-event-handler" (0x82f64c)
> > (gdb) p symbol
> > $1 = 50731778
> > (gdb) xtype
> > Lisp_Symbol
> > (gdb) xsymbol
> > $2 = (struct Lisp_Symbol *) 0x3061b00
> > "buffer-undo-list"
> > (gdb)
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2012-02-06 11:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 18:23 bug#10664: 24.0.93; JIT font-lock infloops in a C file Eli Zaretskii
2012-02-05 18:18 ` Eli Zaretskii
2012-02-06 11:09 ` Alan Mackenzie [this message]
2012-02-06 14:39 ` Stefan Monnier
2012-02-06 17:04 ` Eli Zaretskii
2012-02-07 17:30 ` Eli Zaretskii
2012-02-07 19:20 ` Alan Mackenzie
2012-02-07 20:58 ` Eli Zaretskii
2012-02-07 21:34 ` Alan Mackenzie
2012-02-07 23:39 ` Stefan Monnier
2012-02-08 11:47 ` Alan Mackenzie
2012-02-08 17:49 ` Eli Zaretskii
2012-02-08 19:28 ` Stefan Monnier
2012-02-10 11:28 ` Alan Mackenzie
2012-02-12 20:57 ` Eli Zaretskii
2012-02-14 5:42 ` Chong Yidong
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