Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1259939
| Path | csiph.com!goblin2!goblin.stu.neva.ru!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Andy Lutomirski <luto@amacapital.net> |
| Newsgroups | linux.kernel |
| Subject | Re: 4.3 regression: task_work corruption in vm86 mode? |
| Date | Sat, 31 Oct 2015 06:50:01 +0100 |
| Message-ID | <qpxd7-7ms-7@gated-at.bofh.it> (permalink) |
| References | <qptsR-4Wn-3@gated-at.bofh.it> |
| X-Original-To | Stas Sergeev <stsp@list.ru>, Brian Gerst <brgerst@gmail.com> |
| Dkim-Signature | v=1; a=rsa-sha256; c=relaxed/relaxed; d=amacapital_net.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=esYJdJGY3oSTAYxDce6LCuvl/id5cJajGgRjxHKfzoE=; b=NqkhPdSug5Wpi8SCvEgnMm+JLauHMERdxMhe+TRaKxLGMKIPGv/RALY4gvaPpwWMCq jVASXbdjfBPVnsb5RfkQS7q+qUCRBn5zIOfOmmHkszuvB1/iI9p97urCK3+UNdH/EauI ZSgN4HOM2zeZwTm5l4fQfv8m5Ogxf8W0KdLMfNHUsT8Sommg8VHqM0EnCQ9mYbk9vKFb IE85InmgcQjSAnQKNI8KeS4XBAeKu0gk35QdAZn3odbNeueBKlkNIc+fQShAHRlFpZ2G pgP7HFn1y9idG49txSxid+SbmQg80P+aY3qaOQ/OFWcpGoOC+E3r81v4FyVqRSrnq1MU q4Dg== |
| X-Google-Dkim-Signature | v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=esYJdJGY3oSTAYxDce6LCuvl/id5cJajGgRjxHKfzoE=; b=Mi8GMib4O66mfJ1cZTI2lgYREFPXXMtUisTc9NYPIFuTiD4JcpeZX46APpJo1WwrOT uFzPalRx+1DE9umU5RsQRJxqCfvkTqOEEFtAHmasgF6qf+LibpHk+Ypsfm4g08m2Gw2H A4XoDwKCdxs2HjwEsb/wVzWyEM84IRyY1OgmZwIMTWZ5qhdD8J/ATMD+qy4RjSk3tnu2 Wm0P6Mxa+1V050FGn7MElIgE4iIBUdW2WLv7aWa1R55BYWV6zAXZ1kBJ9LXO210sVcw+ b3TFUn7bBMpQks1lhvBOmp8GUAvTTR8F8z4iDQunJEJwu8bPakDs8nHkA364ARmKmd4p 2Pjg== |
| X-Gm-Message-State | ALoCoQkldJ3XzidB6xp36qE/b/q2nM95mMlPH2wSfJ0HbBwQ6W8Mr9rZ1j0v1yrgbjqGbFMEz4rG |
| X-Received | by 10.202.241.196 with SMTP id p187mr7718747oih.51.1446270229979; Fri, 30 Oct 2015 22:43:49 -0700 (PDT) |
| MIME-Version | 1.0 |
| Content-Type | text/plain; charset=UTF-8 |
| Sender | robomod@news.nic.it |
| List-ID | <linux-kernel.vger.kernel.org> |
| X-Mailing-List | linux-kernel@vger.kernel.org |
| Approved | robomod@news.nic.it |
| Lines | 31 |
| Organization | linux.* mail to news gateway |
| X-Original-Cc | Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Denys Vlasenko <dvlasenk@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Borislav Petkov <bp@alien8.de>, Stas Sergeev <stsp@users.sourceforge.net> |
| X-Original-Date | Fri, 30 Oct 2015 22:43:30 -0700 |
| X-Original-Message-ID | <CALCETrWUmL5bPyxR0gvchtn433hdnSqOuRdBjFsqJqa_xbtBnw@mail.gmail.com> |
| X-Original-References | <CALCETrUY51E290QYob+RMoKAzJCfo+y5-D2nithM1Bo2zOwoMw@mail.gmail.com> |
| X-Original-Sender | linux-kernel-owner@vger.kernel.org |
| Xref | csiph.com linux.kernel:1259939 |
Show key headers only | View raw
On Fri, Oct 30, 2015 at 6:44 PM, Andy Lutomirski <luto@amacapital.net> wrote: > Hi all- > > In 4.3-rc7, running dosemu2 (https://github.com/stsp/dosemu2/) oopses > the system very quickly, as long as CONFIG_VM86=y. It blows up > because snd_seq_delete_port walks ports_list_head, finds two valid > ports, and then starts finding obviously invalid pointers in the list. > > git bisect blames: > > commit 5ed92a8ab71f8865ba07811429c988c72299b315 > Author: Brian Gerst <brgerst@gmail.com> > Date: Wed Jul 29 01:41:19 2015 -0400 > > x86/vm86: Use the normal pt_regs area for vm86 > > I haven't spotted the problem yet. It seems to happen when > task_work_run fires in get_signal, which happens before > save_v86_state. I'm not entirely sure what causes task work to be > scheduled at all while in v86 land. Could we somehow be processing > task_work later than we should? > Nope, the bug has nothing to do with task_work. Patches sent. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
4.3 regression: task_work corruption in vm86 mode? Andy Lutomirski <luto@amacapital.net> - 2015-10-31 02:50 +0100
Re: 4.3 regression: task_work corruption in vm86 mode? Andy Lutomirski <luto@amacapital.net> - 2015-10-31 06:50 +0100
Re: 4.3 regression: task_work corruption in vm86 mode? Stas Sergeev <stsp@list.ru> - 2015-10-31 13:00 +0100
csiph-web