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From: Linus Torvalds <torvalds@linux-foundation.org>
To: kbuild test robot <fengguang.wu@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	"the arch/x86 maintainers" <x86@kernel.org>
Subject: Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f
Date: Wed, 7 Feb 2018 10:13:35 -0800	[thread overview]
Message-ID: <CA+55aFxU7TArLUdcndeLnhfRKLO-Vu-1d0Q6VPb9NYt+-S-LNg@mail.gmail.com> (raw)
In-Reply-To: <5a7ae6af.WSMpvDEeUt6oucKB%fengguang.wu@intel.com>

Adding more people for this funky warning from the kbuild robot.

Something is confused. UD0 is 0f ff, the bytes after that shouldn't
matter. But I guess they can be interpreted as modrm bytes, and
somebody started doing that.

That said, intel only _documents_ UD2 (0f 0b).

Maybe we should avoid using UD0/UD1 entirely.

              Linus

On Wed, Feb 7, 2018 at 3:44 AM, kbuild test robot
<fengguang.wu@intel.com> wrote:
> tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master
> branch HEAD: a2e5790d841658485d642196dbb0927303d6c22f  Merge branch 'akpm' (patches from Andrew)
>
> Regressions in current branch:
>
> arch/x86/tools/insn_decoder_test: warning: ffffffff810010d7:    0f ff eb                ud0    %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001152:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001275:    0f ff eb                ud0    %ebx,%ebp
> arch/x86/tools/insn_decoder_test: warning: ffffffff810013fd:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff81001499:    0f ff bf 09 00 00 00    ud0    0x9(%rdi),%edi
> arch/x86/tools/insn_decoder_test: warning: ffffffff812296eb:    0f ff e8                ud0    %eax,%ebp

  reply	other threads:[~2018-02-07 18:13 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-07 11:44 [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f kbuild test robot
2018-02-07 18:13 ` Linus Torvalds [this message]
2018-02-07 18:35   ` Borislav Petkov
2018-02-07 18:49     ` Peter Zijlstra
2018-02-07 19:03       ` Linus Torvalds
2018-02-07 19:14         ` Peter Zijlstra
2018-02-07 19:28           ` Borislav Petkov
2018-02-07 19:43             ` Linus Torvalds
2018-02-07 20:24               ` Borislav Petkov
2018-02-08  9:13               ` Peter Zijlstra
2018-02-08  9:35                 ` Peter Zijlstra
2018-02-08  9:46                 ` Borislav Petkov
2018-02-08  9:47                 ` David Laight
2018-02-08 10:13                   ` Peter Zijlstra
2018-02-08 17:27                 ` Linus Torvalds
2018-02-08 18:03                   ` Peter Zijlstra
2018-02-08 18:15                     ` Linus Torvalds
2018-02-08 19:44                       ` Peter Zijlstra
2018-02-08 20:02                         ` Linus Torvalds
2018-02-08 20:31                         ` Borislav Petkov
2018-02-08 23:09                           ` [PATCH 0/2] objtool fixes on top of Peter's WARN UD2 patch Josh Poimboeuf
2018-02-08 23:09                             ` [PATCH 1/2] objtool: Fix seg fault in ignore_unreachable_insn() Josh Poimboeuf
2018-02-13 11:29                               ` [tip:x86/pti] objtool: Fix segfault " tip-bot for Josh Poimboeuf
2018-02-15  0:26                               ` tip-bot for Josh Poimboeuf
2018-02-08 23:09                             ` [PATCH 2/2] x86: Annotate WARN-related UD2 as reachable Josh Poimboeuf
2018-02-13 11:30                               ` [tip:x86/pti] x86/debug, objtool: Annotate WARN()-related " tip-bot for Josh Poimboeuf
2018-02-15  0:26                               ` tip-bot for Josh Poimboeuf
2018-02-09  8:13                             ` [PATCH 0/2] objtool fixes on top of Peter's WARN UD2 patch Peter Zijlstra
2018-02-09  8:12                           ` [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f Peter Zijlstra
2018-02-13 11:30                         ` [tip:x86/pti] x86/debug: Use UD2 for WARN() tip-bot for Peter Zijlstra
2018-02-15  0:27                         ` tip-bot for Peter Zijlstra
2018-02-07 18:38   ` [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f Randy Dunlap
2018-02-07 19:01     ` Linus Torvalds
2018-02-07 19:06       ` Peter Zijlstra
2018-02-07 19:10         ` Peter Zijlstra

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