From: Oleg Nesterov <oleg@redhat.com>
To: Felipe Contreras <felipe.contreras@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 3.11-rc4
Date: Mon, 5 Aug 2013 20:46:25 +0200 [thread overview]
Message-ID: <20130805184625.GA11633@redhat.com> (raw)
In-Reply-To: <CAMP44s2bOniz4qx5y9h4ppHRUjiPVGL+igSwO5NUJd4zpObxFw@mail.gmail.com>
On 08/04, Felipe Contreras wrote:
>
> I found a regression while running all v3.11-rcX kernels; Starcract II
> through wine crashes. The culprit is fab840f (ptrace: PTRACE_DETACH
> should do flush_ptrace_hw_breakpoint(child)), I revert that commit and
> there's no crash.
Heh. I pulled wine-git.
set_thread_context() does a lot of PTRACE_POKEUSER requests and then
it calls resume_after_ptrace() which simply does PTRACE_DETACH.
I'll recheck tomorrow, but it really looks as if it _wants_ to leak
the debug registers after detach. And more, it does PTRACE_ATTACH
only to set these regs.
And this is exactly what fab840f tries to prevent.
Oleg.
next prev parent reply other threads:[~2013-08-05 18:51 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-04 21:09 Linux 3.11-rc4 Linus Torvalds
2013-08-05 2:34 ` O_TMPFILE fs corruption (Re: Linux 3.11-rc4) Andy Lutomirski
2013-08-05 3:45 ` Linus Torvalds
2013-08-05 4:45 ` Andrew Lutomirski
2013-08-05 8:26 ` Christoph Hellwig
2013-08-05 16:04 ` Jörn Engel
2013-08-05 14:31 ` Al Viro
2013-08-05 4:20 ` Linux 3.11-rc4 Felipe Contreras
2013-08-05 13:29 ` Oleg Nesterov
2013-08-05 14:27 ` Felipe Contreras
2013-08-05 14:39 ` Oleg Nesterov
2013-08-05 17:02 ` Felipe Contreras
2013-08-05 17:11 ` Oleg Nesterov
2013-08-05 17:40 ` Felipe Contreras
2013-08-05 17:56 ` Oleg Nesterov
2013-08-05 17:39 ` Linus Torvalds
2013-08-05 17:43 ` Felipe Contreras
2013-08-05 18:08 ` Felipe Contreras
2013-08-05 17:47 ` Oleg Nesterov
2013-08-05 18:46 ` Oleg Nesterov [this message]
2013-08-05 18:54 ` Linus Torvalds
2013-08-05 18:57 ` Oleg Nesterov
2013-08-05 19:06 ` Linus Torvalds
2013-08-06 15:43 ` [PATCH 0/1] (Was: Linux 3.11-rc4) Oleg Nesterov
2013-08-06 15:43 ` [PATCH 1/1] Revert "ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)" Oleg Nesterov
2013-08-07 12:05 ` [PATCH 0/1] (Was: Linux 3.11-rc4) Grazvydas Ignotas
2013-08-07 17:22 ` Oleg Nesterov
2013-08-07 19:26 ` Linus Torvalds
2013-08-07 19:27 ` Oleg Nesterov
2013-08-07 19:47 ` Linus Torvalds
2013-08-08 15:41 ` Oleg Nesterov
2013-08-08 16:25 ` Linus Torvalds
2013-08-08 16:54 ` Frederic Weisbecker
2013-08-08 18:15 ` Oleg Nesterov
2013-08-09 16:45 ` Frederic Weisbecker
2013-08-09 17:12 ` Oleg Nesterov
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