unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
From: Eli Zaretskii <eliz@gnu.org>
To: Pip Cet <pipcet@gmail.com>
Cc: akrl@sdf.org, 47067@debbugs.gnu.org
Subject: bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c
Date: Sat, 13 Mar 2021 18:53:48 +0200	[thread overview]
Message-ID: <83czw3hu5f.fsf@gnu.org> (raw)
In-Reply-To: <CAOqdjBdQEMtmqT8F0tCWF8+HTf_-vE2aZoB4H63abgOoKFFZRg@mail.gmail.com> (message from Pip Cet on Sat, 13 Mar 2021 16:32:50 +0000)

> From: Pip Cet <pipcet@gmail.com>
> Date: Sat, 13 Mar 2021 16:32:50 +0000
> Cc: Andrea Corallo <akrl@sdf.org>, 47067@debbugs.gnu.org
> 
> > > > > 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
> 
> It's a long function, that might not have been enough.

But since I found those two, everything before that is irrelevant,
right?

> > > 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.
> 
> So not some mingw wrapper for it?

No, not that I could see.

> I just checked the only "mingw"-like sources I could find, and they
> don't appear to use the frame pointer argument properly...

Why is this suddenly relevant when native compilation is involved?

> > > 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?
> 
> Well, you could just apply this untested patch, fix any obvious
> compile errors I might not have spotted, and try to reproduce it. I'm
> not currently on a Windows (or x86) machine, so it's a bit hard for me
> to test...

I'd like this investigation to be less of a blind search, sorry.  can
you tell what to check or look at to see if this is relevant?

And how is setjmp related to the code which causes segfault?  I see no
call to setjmp in the disassembly.

> > 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.
> 
> Which non-stack addresses are invariant in that backtrace?

Not sure how stack-based vs non-stack based is important here.





  reply	other threads:[~2021-03-13 16:53 UTC|newest]

Thread overview: 115+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-11 11:27 bug#47067: 28.0.50; [feature/native-comp] Crash while scrolling through dispnew.c Eli Zaretskii
2021-03-11 12:19 ` Eli Zaretskii
2021-03-11 14:07 ` Eli Zaretskii
2021-03-12  6:46 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12  8:10   ` Eli Zaretskii
2021-03-12 12:04     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 12:51       ` Eli Zaretskii
2021-03-12 15:27         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 15:50           ` Eli Zaretskii
2021-03-12 16:08             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 16:14               ` Eli Zaretskii
2021-03-12 19:30                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 19:48                   ` Eli Zaretskii
2021-03-12 20:21                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13  7:11                       ` Eli Zaretskii
2021-03-13 19:51                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13 20:07                           ` Eli Zaretskii
2021-03-13 20:20                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  7:19                               ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  8:02                                 ` Eli Zaretskii
2021-03-14  8:10                                   ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14 19:29                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13 19:48                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 16:23               ` Eli Zaretskii
2021-03-12 19:04                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 19:32                   ` Eli Zaretskii
2021-03-12 20:10                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13  8:34                       ` Eli Zaretskii
2021-03-19  9:42                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-19 12:10                           ` Eli Zaretskii
2021-03-19 14:05                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-19 14:09                               ` Eli Zaretskii
2021-03-20  9:52                                 ` Eli Zaretskii
2021-03-21  8:26                                   ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-21  9:52                                     ` Eli Zaretskii
2021-03-21 11:56                                       ` Eli Zaretskii
2021-03-21 14:37                                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-21 15:34                                           ` Eli Zaretskii
2021-03-21 15:41                                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-21 15:54                                               ` Eli Zaretskii
2021-03-21 16:41                                                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-21 17:01                                                   ` Eli Zaretskii
2021-03-21 18:36                                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-25 16:51                                                       ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-25 17:03                                                         ` Eli Zaretskii
2021-03-25 20:24                                                           ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-25 20:43                                                             ` Eli Zaretskii
2021-04-04 20:52                                                               ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-05 15:06                                                                 ` Eli Zaretskii
2021-04-05 16:09                                                                   ` Eli Zaretskii
2021-04-05 17:58                                                                     ` Eli Zaretskii
2021-04-06 13:17                                                                       ` Eli Zaretskii
2021-04-06 13:29                                                                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-06 13:53                                                                           ` Eli Zaretskii
2021-04-06 14:01                                                                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-05 18:45                                                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-05 18:04                                                                   ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-05 18:19                                                                     ` Eli Zaretskii
2021-04-05 18:47                                                                       ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-05 19:22                                                                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-06 15:49                                                                           ` Eli Zaretskii
2021-04-06 16:06                                                                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-04-06 16:09                                                                               ` Eli Zaretskii
2021-03-21 14:36                                       ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-12 18:42         ` Pip Cet
2021-03-12 19:50           ` Eli Zaretskii
2021-03-13  8:18             ` Pip Cet
2021-03-13  8:47               ` Eli Zaretskii
2021-03-13  8:53                 ` Pip Cet
2021-03-13 11:10                   ` Eli Zaretskii
2021-03-13 11:23                     ` Eli Zaretskii
2021-03-13 11:24                     ` Pip Cet
2021-03-13 15:27                       ` Eli Zaretskii
2021-03-13 15:45                         ` Pip Cet
2021-03-13 16:21                           ` Eli Zaretskii
2021-03-13 16:32                             ` Pip Cet
2021-03-13 16:53                               ` Eli Zaretskii [this message]
2021-03-13 17:10                                 ` Pip Cet
2021-03-13 17:26                                   ` Eli Zaretskii
2021-03-13 18:55                                     ` Pip Cet
2021-03-13 19:43                                       ` Eli Zaretskii
2021-03-13 20:53                                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13 21:00                                   ` Pip Cet
2021-03-13 21:07                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-13 21:11                                       ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  6:07                                       ` Eli Zaretskii
2021-03-14  6:53                                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  7:21                                           ` Eli Zaretskii
2021-03-14  7:31                                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  7:48                                               ` Eli Zaretskii
2021-03-14  8:02                                                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  8:06                                                 ` Pip Cet
2021-03-14 11:39                                                   ` Eli Zaretskii
2021-03-14 11:44                                                     ` Pip Cet
2021-03-14 12:08                                                       ` Eli Zaretskii
2021-03-14 12:09                                                         ` Pip Cet
2021-03-14 12:17                                                           ` Pip Cet
2021-03-14 13:31                                                             ` Eli Zaretskii
2021-03-14 14:08                                                               ` Eli Zaretskii
2021-03-14 18:47                                                                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
     [not found]                                                                   ` <83mtv5frr4.fsf@gnu.org>
2021-03-14 20:30                                                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-15 18:36                                                                       ` Eli Zaretskii
2021-03-15 20:17                                                                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-16 13:25                                                                           ` Eli Zaretskii
2021-03-14  8:03                                               ` Pip Cet
2021-03-14  5:55                                   ` Eli Zaretskii
2021-03-14  6:57                                     ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14  8:20                                       ` Eli Zaretskii
2021-03-13 17:09                               ` Eli Zaretskii
2021-03-14 12:17                           ` Eli Zaretskii
2021-03-14 19:00                             ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-14 19:48                               ` Eli Zaretskii
2021-03-14 20:36                                 ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-03-15  3:24                                   ` Eli Zaretskii
2021-03-13 20:03                         ` Andrea Corallo via Bug reports for GNU Emacs, the Swiss army knife of text editors

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=83czw3hu5f.fsf@gnu.org \
    --to=eliz@gnu.org \
    --cc=47067@debbugs.gnu.org \
    --cc=akrl@sdf.org \
    --cc=pipcet@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).