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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@kernel.org>,
	Nicolai Stange <nstange@suse.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
	Petr Mladek <pmladek@suse.com>,
	Joe Lawrence <joe.lawrence@redhat.com>,
	Shuah Khan <shuah@kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Mimi Zohar <zohar@linux.ibm.com>, Juergen Gross <jgross@suse.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nayna Jain <nayna@linux.ibm.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Joerg Roedel <jroedel@suse.de>,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>,
	stable <stable@vger.kernel.org>
Subject: Re: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
Date: Mon, 6 May 2019 11:06:51 -0700	[thread overview]
Message-ID: <CAHk-=whesas+GDtHZks62wqXWXe4d_g3XJ359GX81qj=Fgs6qQ@mail.gmail.com> (raw)
In-Reply-To: <20190506130643.62c35eeb@gandalf.local.home>

On Mon, May 6, 2019 at 10:06 AM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> Can you try booting with:
> [ snip snip ]
>
> And see if it boots?

No it doesn't.

Dang, I tried to figure out what's up, but now I really have to start
handling all the puill requests..

I thought it might be an int3 that happens on the entry stack, but I
don't think that should ever happen. Either it's a user-mode int3, or
we're in the kernel and have switched stacks. So I still don't see why
my patch doesn't work, but now I have no time to debug it.

                   Linus

WARNING: multiple messages have this Message-ID (diff)
From: torvalds at linux-foundation.org (Linus Torvalds)
Subject: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
Date: Mon, 6 May 2019 11:06:51 -0700	[thread overview]
Message-ID: <CAHk-=whesas+GDtHZks62wqXWXe4d_g3XJ359GX81qj=Fgs6qQ@mail.gmail.com> (raw)
In-Reply-To: <20190506130643.62c35eeb@gandalf.local.home>

On Mon, May 6, 2019 at 10:06 AM Steven Rostedt <rostedt at goodmis.org> wrote:
>
> Can you try booting with:
> [ snip snip ]
>
> And see if it boots?

No it doesn't.

Dang, I tried to figure out what's up, but now I really have to start
handling all the puill requests..

I thought it might be an int3 that happens on the entry stack, but I
don't think that should ever happen. Either it's a user-mode int3, or
we're in the kernel and have switched stacks. So I still don't see why
my patch doesn't work, but now I have no time to debug it.

                   Linus

WARNING: multiple messages have this Message-ID (diff)
From: torvalds@linux-foundation.org (Linus Torvalds)
Subject: [RFC][PATCH 1/2] x86: Allow breakpoints to emulate call functions
Date: Mon, 6 May 2019 11:06:51 -0700	[thread overview]
Message-ID: <CAHk-=whesas+GDtHZks62wqXWXe4d_g3XJ359GX81qj=Fgs6qQ@mail.gmail.com> (raw)
Message-ID: <20190506180651.DygSK0KNaLrj4EQct9YTRMaxu5bTj3OsSmZa8h8uQJU@z> (raw)
In-Reply-To: <20190506130643.62c35eeb@gandalf.local.home>

On Mon, May 6, 2019@10:06 AM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> Can you try booting with:
> [ snip snip ]
>
> And see if it boots?

No it doesn't.

Dang, I tried to figure out what's up, but now I really have to start
handling all the puill requests..

I thought it might be an int3 that happens on the entry stack, but I
don't think that should ever happen. Either it's a user-mode int3, or
we're in the kernel and have switched stacks. So I still don't see why
my patch doesn't work, but now I have no time to debug it.

                   Linus

  reply	other threads:[~2019-05-06 18:07 UTC|newest]

Thread overview: 307+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-01 20:28 [RFC][PATCH 0/2] ftrace/x86: Allow for breakpoint handlers to emulate call functions Steven Rostedt
2019-05-01 20:28 ` [RFC][PATCH 1/2] x86: Allow breakpoints " Steven Rostedt
2019-05-01 20:28   ` Steven Rostedt
2019-05-01 20:28   ` rostedt
2019-05-02  3:24   ` Steven Rostedt
2019-05-02  3:24     ` Steven Rostedt
2019-05-02  3:24     ` rostedt
2019-05-02 16:21     ` Peter Zijlstra
2019-05-02 16:21       ` Peter Zijlstra
2019-05-02 16:21       ` peterz
2019-05-02 16:29       ` Peter Zijlstra
2019-05-02 16:29         ` Peter Zijlstra
2019-05-02 16:29         ` peterz
2019-05-02 18:02       ` Linus Torvalds
2019-05-02 18:02         ` Linus Torvalds
2019-05-02 18:02         ` torvalds
2019-05-02 18:18         ` Peter Zijlstra
2019-05-02 18:18           ` Peter Zijlstra
2019-05-02 18:18           ` peterz
2019-05-02 18:30           ` Peter Zijlstra
2019-05-02 18:30             ` Peter Zijlstra
2019-05-02 18:30             ` peterz
2019-05-02 18:43           ` Linus Torvalds
2019-05-02 18:43             ` Linus Torvalds
2019-05-02 18:43             ` torvalds
2019-05-02 19:28             ` Jiri Kosina
2019-05-02 19:28               ` Jiri Kosina
2019-05-02 19:28               ` jikos
2019-05-02 20:25               ` Andy Lutomirski
2019-05-02 20:25                 ` Andy Lutomirski
2019-05-02 20:25                 ` luto
2019-05-02 20:21             ` Peter Zijlstra
2019-05-02 20:21               ` Peter Zijlstra
2019-05-02 20:21               ` peterz
2019-05-02 20:49               ` Linus Torvalds
2019-05-02 20:49                 ` Linus Torvalds
2019-05-02 20:49                 ` torvalds
2019-05-02 21:32                 ` Peter Zijlstra
2019-05-02 21:32                   ` Peter Zijlstra
2019-05-02 21:32                   ` peterz
2019-05-03 19:24                 ` Steven Rostedt
2019-05-03 19:24                   ` Steven Rostedt
2019-05-03 19:24                   ` rostedt
2019-05-03 21:46                   ` Linus Torvalds
2019-05-03 21:46                     ` Linus Torvalds
2019-05-03 21:46                     ` torvalds
2019-05-03 22:49                     ` Steven Rostedt
2019-05-03 22:49                       ` Steven Rostedt
2019-05-03 22:49                       ` rostedt
2019-05-03 23:07                       ` Linus Torvalds
2019-05-03 23:07                         ` Linus Torvalds
2019-05-03 23:07                         ` torvalds
2019-05-04  4:17                         ` Steven Rostedt
2019-05-04  4:17                           ` Steven Rostedt
2019-05-04  4:17                           ` rostedt
     [not found]                           ` <CAHk-=wiuSFbv_rELND-BLWcP0GSZ0yF=xOAEcf61GE3bU9d=yg@mail.gmail.com>
2019-05-04 18:59                             ` Linus Torvalds
2019-05-04 18:59                               ` Linus Torvalds
2019-05-04 18:59                               ` torvalds
2019-05-04 20:12                               ` Andy Lutomirski
2019-05-04 20:12                                 ` Andy Lutomirski
2019-05-04 20:12                                 ` luto
2019-05-04 20:28                                 ` Linus Torvalds
2019-05-04 20:28                                   ` Linus Torvalds
2019-05-04 20:28                                   ` torvalds
2019-05-04 20:36                                 ` Linus Torvalds
2019-05-04 20:36                                   ` Linus Torvalds
2019-05-04 20:36                                   ` torvalds
2019-05-03 22:55                     ` Andy Lutomirski
2019-05-03 22:55                       ` Andy Lutomirski
2019-05-03 22:55                       ` luto
2019-05-03 23:16                       ` Linus Torvalds
2019-05-03 23:16                         ` Linus Torvalds
2019-05-03 23:16                         ` torvalds
2019-05-03 23:32                         ` Andy Lutomirski
2019-05-03 23:32                           ` Andy Lutomirski
2019-05-03 23:32                           ` luto
2019-05-02 22:52               ` Steven Rostedt
2019-05-02 22:52                 ` Steven Rostedt
2019-05-02 22:52                 ` rostedt
2019-05-02 23:31                 ` Steven Rostedt
2019-05-02 23:31                   ` Steven Rostedt
2019-05-02 23:31                   ` rostedt
2019-05-02 23:50                   ` Steven Rostedt
2019-05-02 23:50                     ` Steven Rostedt
2019-05-02 23:50                     ` rostedt
2019-05-03  1:51                     ` [RFC][PATCH 1/2 v2] " Steven Rostedt
2019-05-03  1:51                       ` Steven Rostedt
2019-05-03  1:51                       ` rostedt
2019-05-03  9:29                     ` [RFC][PATCH 1/2] " Peter Zijlstra
2019-05-03  9:29                       ` Peter Zijlstra
2019-05-03  9:29                       ` peterz
2019-05-03 13:22                       ` Steven Rostedt
2019-05-03 13:22                         ` Steven Rostedt
2019-05-03 13:22                         ` rostedt
2019-05-03 16:20                         ` Andy Lutomirski
2019-05-03 16:20                           ` Andy Lutomirski
2019-05-03 16:20                           ` luto
2019-05-03 16:31                           ` Steven Rostedt
2019-05-03 16:31                             ` Steven Rostedt
2019-05-03 16:31                             ` rostedt
2019-05-03 16:35                             ` Peter Zijlstra
2019-05-03 16:35                               ` Peter Zijlstra
2019-05-03 16:35                               ` peterz
2019-05-03 16:44                               ` Andy Lutomirski
2019-05-03 16:44                                 ` Andy Lutomirski
2019-05-03 16:44                                 ` luto
2019-05-03 16:49                                 ` Steven Rostedt
2019-05-03 16:49                                   ` Steven Rostedt
2019-05-03 16:49                                   ` rostedt
2019-05-03 16:32                           ` Peter Zijlstra
2019-05-03 16:32                             ` Peter Zijlstra
2019-05-03 16:32                             ` peterz
2019-05-03 18:57                           ` Linus Torvalds
2019-05-03 18:57                             ` Linus Torvalds
2019-05-03 18:57                             ` torvalds
2019-05-06  8:19                             ` Peter Zijlstra
2019-05-06  8:19                               ` Peter Zijlstra
2019-05-06  8:19                               ` peterz
2019-05-06 13:56                               ` Steven Rostedt
2019-05-06 13:56                                 ` Steven Rostedt
2019-05-06 13:56                                 ` rostedt
2019-05-06 16:17                                 ` Linus Torvalds
2019-05-06 16:17                                   ` Linus Torvalds
2019-05-06 16:17                                   ` torvalds
2019-05-06 16:19                                   ` Linus Torvalds
2019-05-06 16:19                                     ` Linus Torvalds
2019-05-06 16:19                                     ` torvalds
2019-05-06 17:06                                   ` Steven Rostedt
2019-05-06 17:06                                     ` Steven Rostedt
2019-05-06 17:06                                     ` rostedt
2019-05-06 18:06                                     ` Linus Torvalds [this message]
2019-05-06 18:06                                       ` Linus Torvalds
2019-05-06 18:06                                       ` torvalds
2019-05-06 18:57                                       ` Steven Rostedt
2019-05-06 18:57                                         ` Steven Rostedt
2019-05-06 18:57                                         ` rostedt
2019-05-06 19:46                                         ` Linus Torvalds
2019-05-06 19:46                                           ` Linus Torvalds
2019-05-06 19:46                                           ` torvalds
2019-05-06 20:29                                           ` Steven Rostedt
2019-05-06 20:29                                             ` Steven Rostedt
2019-05-06 20:29                                             ` rostedt
2019-05-06 20:42                                             ` Linus Torvalds
2019-05-06 20:42                                               ` Linus Torvalds
2019-05-06 20:42                                               ` torvalds
2019-05-06 20:44                                               ` Linus Torvalds
2019-05-06 20:44                                                 ` Linus Torvalds
2019-05-06 20:44                                                 ` torvalds
2019-05-06 21:45                                               ` Steven Rostedt
2019-05-06 21:45                                                 ` Steven Rostedt
2019-05-06 21:45                                                 ` rostedt
2019-05-06 22:06                                                 ` Linus Torvalds
2019-05-06 22:06                                                   ` Linus Torvalds
2019-05-06 22:06                                                   ` torvalds
2019-05-06 22:31                                                   ` Linus Torvalds
2019-05-06 22:31                                                     ` Linus Torvalds
2019-05-06 22:31                                                     ` torvalds
2019-05-07  0:10                                                     ` Steven Rostedt
2019-05-07  0:10                                                       ` Steven Rostedt
2019-05-07  0:10                                                       ` rostedt
2019-05-07  1:06                                                       ` Linus Torvalds
2019-05-07  1:06                                                         ` Linus Torvalds
2019-05-07  1:06                                                         ` torvalds
2019-05-07  1:04                                                   ` Steven Rostedt
2019-05-07  1:04                                                     ` Steven Rostedt
2019-05-07  1:04                                                     ` rostedt
2019-05-07  1:34                                                     ` Steven Rostedt
2019-05-07  1:34                                                       ` Steven Rostedt
2019-05-07  1:34                                                       ` rostedt
2019-05-07  1:34                                                     ` Linus Torvalds
2019-05-07  1:34                                                       ` Linus Torvalds
2019-05-07  1:34                                                       ` torvalds
2019-05-07  1:53                                                       ` Steven Rostedt
2019-05-07  1:53                                                         ` Steven Rostedt
2019-05-07  1:53                                                         ` rostedt
2019-05-07  2:22                                                         ` Linus Torvalds
2019-05-07  2:22                                                           ` Linus Torvalds
2019-05-07  2:22                                                           ` torvalds
2019-05-07  2:58                                                           ` Steven Rostedt
2019-05-07  2:58                                                             ` Steven Rostedt
2019-05-07  2:58                                                             ` rostedt
2019-05-07  3:05                                                             ` Linus Torvalds
2019-05-07  3:05                                                               ` Linus Torvalds
2019-05-07  3:05                                                               ` torvalds
2019-05-07  3:21                                                               ` Steven Rostedt
2019-05-07  3:21                                                                 ` Steven Rostedt
2019-05-07  3:21                                                                 ` rostedt
2019-05-07  3:28                                                                 ` Linus Torvalds
2019-05-07  3:28                                                                   ` Linus Torvalds
2019-05-07  3:28                                                                   ` torvalds
2019-05-07 14:54                                                                   ` Linus Torvalds
2019-05-07 14:54                                                                     ` Linus Torvalds
2019-05-07 14:54                                                                     ` torvalds
2019-05-07 15:12                                                                     ` Steven Rostedt
2019-05-07 15:12                                                                       ` Steven Rostedt
2019-05-07 15:12                                                                       ` rostedt
2019-05-07 15:25                                                                       ` Steven Rostedt
2019-05-07 15:25                                                                         ` Steven Rostedt
2019-05-07 15:25                                                                         ` rostedt
2019-05-07 16:25                                                                         ` Steven Rostedt
2019-05-07 16:25                                                                           ` Steven Rostedt
2019-05-07 16:25                                                                           ` rostedt
2019-05-07 15:31                                                                       ` Linus Torvalds
2019-05-07 15:31                                                                         ` Linus Torvalds
2019-05-07 15:31                                                                         ` torvalds
2019-05-07 15:45                                                                         ` Steven Rostedt
2019-05-07 15:45                                                                           ` Steven Rostedt
2019-05-07 15:45                                                                           ` rostedt
2019-05-07 16:34                                                                         ` Peter Zijlstra
2019-05-07 16:34                                                                           ` Peter Zijlstra
2019-05-07 16:34                                                                           ` peterz
2019-05-07 17:08                                                                           ` Linus Torvalds
2019-05-07 17:08                                                                             ` Linus Torvalds
2019-05-07 17:08                                                                             ` torvalds
2019-05-07 17:21                                                                             ` Josh Poimboeuf
2019-05-07 17:21                                                                               ` Josh Poimboeuf
2019-05-07 17:21                                                                               ` jpoimboe
2019-05-07 21:24                                                                               ` Steven Rostedt
2019-05-07 21:24                                                                                 ` Steven Rostedt
2019-05-07 21:24                                                                                 ` rostedt
2019-05-08  4:50                                                                                 ` Linus Torvalds
2019-05-08  4:50                                                                                   ` Linus Torvalds
2019-05-08  4:50                                                                                   ` torvalds
2019-05-08 16:37                                                                                   ` Steven Rostedt
2019-05-08 16:37                                                                                     ` Steven Rostedt
2019-05-08 16:37                                                                                     ` rostedt
2019-05-07 17:38                                                                             ` Peter Zijlstra
2019-05-07 17:38                                                                               ` Peter Zijlstra
2019-05-07 17:38                                                                               ` peterz
2019-05-07  9:51                                                           ` Peter Zijlstra
2019-05-07  9:51                                                             ` Peter Zijlstra
2019-05-07  9:51                                                             ` peterz
2019-05-07 14:48                                                           ` Andy Lutomirski
2019-05-07 14:48                                                             ` Andy Lutomirski
2019-05-07 14:48                                                             ` luto
2019-05-07 14:57                                                             ` Linus Torvalds
2019-05-07 14:57                                                               ` Linus Torvalds
2019-05-07 14:57                                                               ` torvalds
2019-05-07 14:13                                                 ` Masami Hiramatsu
2019-05-07 14:13                                                   ` Masami Hiramatsu
2019-05-07 14:13                                                   ` mhiramat
2019-05-07 17:15                                                   ` Masami Hiramatsu
2019-05-07 17:15                                                     ` Masami Hiramatsu
2019-05-07 17:15                                                     ` mhiramat
2019-05-06 14:22                               ` Peter Zijlstra
2019-05-06 14:22                                 ` Peter Zijlstra
2019-05-06 14:22                                 ` peterz
2019-05-07  8:57                               ` Peter Zijlstra
2019-05-07  8:57                                 ` Peter Zijlstra
2019-05-07  8:57                                 ` peterz
2019-05-07  9:18                                 ` David Laight
2019-05-07  9:18                                   ` David Laight
2019-05-07  9:18                                   ` David.Laight
2019-05-07 11:30                                   ` Peter Zijlstra
2019-05-07 11:30                                     ` Peter Zijlstra
2019-05-07 11:30                                     ` peterz
2019-05-07 12:57                                     ` David Laight
2019-05-07 12:57                                       ` David Laight
2019-05-07 12:57                                       ` David.Laight
2019-05-07 13:14                                       ` Steven Rostedt
2019-05-07 13:14                                         ` Steven Rostedt
2019-05-07 13:14                                         ` rostedt
2019-05-07 14:50                                         ` David Laight
2019-05-07 14:50                                           ` David Laight
2019-05-07 14:50                                           ` David.Laight
2019-05-07 14:57                                           ` Steven Rostedt
2019-05-07 14:57                                             ` Steven Rostedt
2019-05-07 14:57                                             ` rostedt
2019-05-07 15:46                                             ` David Laight
2019-05-07 15:46                                               ` David Laight
2019-05-07 15:46                                               ` David.Laight
2019-05-07 13:32                                       ` Peter Zijlstra
2019-05-07 13:32                                         ` Peter Zijlstra
2019-05-07 13:32                                         ` peterz
2019-05-07  9:27                                 ` Peter Zijlstra
2019-05-07  9:27                                   ` Peter Zijlstra
2019-05-07  9:27                                   ` peterz
2019-05-07 12:27                                   ` Steven Rostedt
2019-05-07 12:27                                     ` Steven Rostedt
2019-05-07 12:27                                     ` rostedt
2019-05-07 12:41                                     ` Peter Zijlstra
2019-05-07 12:41                                       ` Peter Zijlstra
2019-05-07 12:41                                       ` peterz
2019-05-07 12:54                                       ` Steven Rostedt
2019-05-07 12:54                                         ` Steven Rostedt
2019-05-07 12:54                                         ` rostedt
2019-05-07 17:22                                         ` Masami Hiramatsu
2019-05-07 17:22                                           ` Masami Hiramatsu
2019-05-07 17:22                                           ` masami.hiramatsu
2019-05-07 14:28                                 ` Peter Zijlstra
2019-05-07 14:28                                   ` Peter Zijlstra
2019-05-07 14:28                                   ` peterz
2019-05-02 20:48         ` Steven Rostedt
2019-05-02 20:48           ` Steven Rostedt
2019-05-02 20:48           ` rostedt
2019-05-06 15:14         ` Josh Poimboeuf
2019-05-06 15:14           ` Josh Poimboeuf
2019-05-06 15:14           ` jpoimboe
2019-05-01 20:28 ` [RFC][PATCH 2/2] ftrace/x86: Emulate call function while updating in breakpoint handler Steven Rostedt
2019-05-01 20:28   ` Steven Rostedt
2019-05-01 20:28   ` rostedt
2019-05-03 10:22 ` [RFC][PATCH 1.5/2] x86: Add int3_emulate_call() selftest Peter Zijlstra
2019-05-03 10:22   ` Peter Zijlstra
2019-05-03 10:22   ` peterz
2019-05-03 18:46   ` Steven Rostedt
2019-05-03 18:46     ` Steven Rostedt
2019-05-03 18:46     ` rostedt

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