From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c Date: Sat, 13 Mar 2021 18:21:22 +0200 Message-ID: <83k0qbhvnh.fsf@gnu.org> References: <83sg52lykn.fsf@gnu.org> <83mtv8lrmf.fsf@gnu.org> <83czw4lelg.fsf@gnu.org> <83mtv8jgn2.fsf@gnu.org> <834khfjv7q.fsf@gnu.org> <83tupfia1m.fsf@gnu.org> <83mtv7hy5c.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="19231"; mail-complaints-to="usenet@ciao.gmane.io" Cc: akrl@sdf.org, 47067@debbugs.gnu.org To: Pip Cet Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Mar 13 17:22:09 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lL71l-0004tg-A3 for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 13 Mar 2021 17:22:09 +0100 Original-Received: from localhost ([::1]:41822 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lL71k-0003yj-1k for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 13 Mar 2021 11:22:08 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59938) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lL71e-0003ya-Ar for bug-gnu-emacs@gnu.org; Sat, 13 Mar 2021 11:22:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:48989) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lL71e-00045v-2D for bug-gnu-emacs@gnu.org; Sat, 13 Mar 2021 11:22:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lL71d-0001Tv-SY for bug-gnu-emacs@gnu.org; Sat, 13 Mar 2021 11:22:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 13 Mar 2021 16:22:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 47067 X-GNU-PR-Package: emacs Original-Received: via spool by 47067-submit@debbugs.gnu.org id=B47067.16156524865651 (code B ref 47067); Sat, 13 Mar 2021 16:22:01 +0000 Original-Received: (at 47067) by debbugs.gnu.org; 13 Mar 2021 16:21:26 +0000 Original-Received: from localhost ([127.0.0.1]:60535 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lL714-0001T4-7S for submit@debbugs.gnu.org; Sat, 13 Mar 2021 11:21:26 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:41936) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lL712-0001Sq-98 for 47067@debbugs.gnu.org; Sat, 13 Mar 2021 11:21:24 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:35973) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lL70w-0003Xz-Dd; Sat, 13 Mar 2021 11:21:18 -0500 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:2821 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1lL70v-0003aK-Jf; Sat, 13 Mar 2021 11:21:18 -0500 In-Reply-To: (message from Pip Cet on Sat, 13 Mar 2021 15:45:52 +0000) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:202268 Archived-At: > From: Pip Cet > Date: Sat, 13 Mar 2021 15:45:52 +0000 > Cc: Andrea Corallo , 47067@debbugs.gnu.org > > On Sat, Mar 13, 2021 at 3:27 PM Eli Zaretskii wrote: > > > > It's nowhere in the C backtrace, only its caller > > > > > > But it was in one of the previous backtraces? > > > > Too many moons ago. The ABI was bumped since then, and so did the > > *.eln files. > > The code you pasted matches c-beginning-of-statement-1, and so does > the Lisp backtrace, so I would suggest we go with it... I don't know how to go with it: the backtrace is truncated (for reasons I don't yet understand) before it gets to it. > > > So EDI is bunk at this point. Can you go back a bit further to where > > > it's initialized? > > > > Sorry, I don't understand: I gave you the disassembly of 512 bytes > > before, isn't that enough to see where EDI is assigned the value? Or > > what do you mean by "go back"? > > It's not enough, no. we're looking for an insn of the form mov XXX, > %edi or lea XXX, %edi, or anything like that. I went back 4KB, and the only two instructions that write into EDI are the following: 0x09e3159d: mov -0x100(%ebp),%edi 0x09e31c71: mov 0x9f37b9c,%edi > I'm suspicious because EDI is a register variable that is clobbered > somehow right after a setjmp returned. Which setjmp implementation are > you using? Not sure how to answer that. AFAIK, it's a setjmp from the MS runtime. > Is it possible that you're on Windows, but unlike other Windows > setjmps, it's unsafe to call your setjmp through a function pointer? How do I tell? And why I never had any problems with setjmp elsewhere in Emacs, although we use it all the time in keyboard.c and elsewhere? Here's an interesting factoid: while most addresses in the backtraces I see with this recipe are identical from run to run, the 'fun' arguments of funcall_lambda's aren't. Compare the backtrace I sent 3 messages ago with this one: #0 0x01236964 in arithcompare_driver (nargs=2, args=0x28, comparison=ARITH_LESS) at data.c:2673 #1 0x01236a3c in Flss (nargs=2, args=0x28) at data.c:2691 #2 0x09e32285 in ?? () #3 0x01261a74 in funcall_lambda (fun=XIL(0xa000000007650188), nargs=5, arg_vector=0x826a08) at eval.c:3292 #4 0x012603c9 in Ffuncall (nargs=6, args=0x826a00) at eval.c:3013 #5 0x09ea0dbf in ?? () #6 0x012603c9 in Ffuncall (nargs=1, args=0x826bd8) at eval.c:3013 #7 0x09e8e041 in ?? () #8 0x01261a74 in funcall_lambda (fun=XIL(0xa00000000778d5b8), nargs=1, arg_vector=0x826db8) at eval.c:3292 #9 0x012603c9 in Ffuncall (nargs=2, args=0x826db0) at eval.c:3013 #10 0x70895b36 in F632d666f6e742d6c6f636b2d6375742d6f66662d6465636c617261746f7273_c_font_lock_cut_off_declarators_0 () from d:\usr\eli\.emacs.d\eln-cache\28.0.50-7d88f6c1\cc-fonts-d7d8a7f5-b7c359cd.eln #11 0x01261a74 in funcall_lambda (fun=XIL(0xa000000007785f78), nargs=1, arg_vector=0x827050) at eval.c:3292 #12 0x012603c9 in Ffuncall (nargs=2, args=0x827048) at eval.c:3013 #13 0x068daf93 in ?? () #14 0x012dea14 in helper_save_restriction () at comp.c:4575 #15 0x0122eb86 in wrong_type_argument (predicate=XIL(0x892404890c245c89), value=XIL(0x8244c89e45d8be0)) at data.c:143 Backtrace stopped: previous frame inner to this frame (corrupt stack?) Note how arguments to Funcall's are the same, whereas arguments to funcall_lambda's aren't. Even the garbage in the 2 arguments to wrong_type_argument are identical. Sounds like something is uninitialized somewhere? Hmm...