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[23.128.96.18]) by mx.google.com with ESMTP id i6si710454ilj.74.2021.05.26.17.58.50; Wed, 26 May 2021 17:59:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=wTn6lXcS; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233099AbhEZWEm (ORCPT + 99 others); Wed, 26 May 2021 18:04:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51804 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233037AbhEZWEi (ORCPT ); Wed, 26 May 2021 18:04:38 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA6D5C061574 for ; Wed, 26 May 2021 15:03:06 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1622066583; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=UTohWqh3CSUGUskeJH4858GrTk9b2+xV1h3FHXzjaSU=; b=wTn6lXcSZYO2TFFgWrM2WXXKKx47TL0MrnqKsGIxkwrr5hdRVf57DDva3YhYKiVkvdpEzl 5t5Arh+vgdrUUYVMHTXEU4oLtZAcdABbCVEkBrf0sEWylbYztyBnJ5wf+qKn1zBqDc3epC 5B13ZIv4PqQyDHvZijrf97yDZLlgJNzX76AioSXJN0AiRMnnP05rlhHavLhdRWA6IvTxEj bXk4yneKWFzYJshPRijClnYRxjq78odRTj8kk4no9fUCUKl1euiAIC4jMi9Tdy+5bphvcR 6fDXCzPC/E5AV5FsTk6MVVQmHohRsDIpmdnB+laZDD8ffO9YlfIrjILJAsPfQA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1622066583; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=UTohWqh3CSUGUskeJH4858GrTk9b2+xV1h3FHXzjaSU=; b=lM0paLMzfM2uJwyiCU7lUlADVqFr7WzxGxoDcbVscPRdeGvlJ5AeIp/xWsGoSEzAIbpUYf BI4Dj9Xu1qZ/k8Cw== To: Andy Lutomirski , syzbot , bp@alien8.de, bp@suse.de, dave.hansen@linux.intel.com, fenghua.yu@intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tony.luck@intel.com, x86@kernel.org, yu-cheng.yu@intel.com Subject: Re: [syzbot] WARNING in ex_handler_fprestore In-Reply-To: References: <0000000000004c453905c30f8334@google.com> Date: Thu, 27 May 2021 00:03:03 +0200 Message-ID: <87sg29886g.ffs@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 25 2021 at 17:33, Andy Lutomirski wrote: > On 5/24/21 1:51 AM, syzbot wrote: > I entirely believe that this bug is real and that syzbot bisected it > correctly, but I'm puzzled by the reproducer. It says: The bug is real and the bisection is correct. > ptrace$setregs(0xd, r0, 0x0, &(0x7f0000000080)) > > I would really, really expect this to result from PTRACE_SETREGSET or > PTRACE_SETFPREGS, but this is PTRACE_SETREGS. > > Am I missing something really obvious here? That ptrace muck is a red herring and has nothing to do with it. I decoded it fully by now and will send out coherent info (and hopefully a patch) tomorrow with brain awake. Time for bed here... Thanks, tglx