From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CF4772617 for ; Thu, 31 Jul 2025 07:09:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753945747; cv=none; b=d7WZeE3mWdegKMEdBrhrfZ62JUka0hOFsGVjmaLODvBf77z4r9OprmT0Etv+4ykkmRnQOduUtIOBjWm8WSkAZy8BvOFKpiQpRFvMXZqjSyKDCiTmiXDPpBKL/Q8XQ9Zast8bPkzVzOzp07UHG4VI1AqCap4/GWJcmKfdm5AHkfA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753945747; c=relaxed/simple; bh=3CegUHe+7UemHnE/ubES78XKIkLpzEVOgLyiU4X1cz8=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=T0JrWxj5g7Bb5/+ftk+kFC4hvjcZOFl919EMO0w7VL3wLK0WeYfc7sVROibKSZsFuJy42K2pYkd9r6jRTp8W3urPNNJRMj7a0dPcCj0eoHGmtVePa4Hzqpc3aFPOkRuN6HBdbDmvWKoUsDaJzOhzbDIzZCTwcV+qx3lk9wc7ELk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=wZoqS4GE; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=6LtiQIhE; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="wZoqS4GE"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="6LtiQIhE" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1753945743; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=3CegUHe+7UemHnE/ubES78XKIkLpzEVOgLyiU4X1cz8=; b=wZoqS4GEHyVDb1tMiyrxto4guIe+n5ctbITrDwYvEPulshBOeYLzLtgWPs8lyHF6VV83Hr UbpEJPRx/IFLXz4ddxS8kg1xiJeWxmhaCkAk/tzCI5W3ms9Snuj1Y/+ZR9fKrrw3lLtVK5 VNOe7RdCK/DeEpSa6WyZxKSH6ejx1Ohl0J8Z0R1q7NDDDJC3Q9a2UhU9XV1TFbd/gfOLFU 4zrDIWLRMWxiplW5fNG10bCLPWyqDvxJI1TGKu5YiyuV4yFBbwUcIkS6ZcU/53LumXDcAv 4Tos5VUX0L4yh9vBJJII3TiO/+fUlPVhGKu0T3WmruR54nDXF85ispN8sMxfnw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1753945743; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=3CegUHe+7UemHnE/ubES78XKIkLpzEVOgLyiU4X1cz8=; b=6LtiQIhEZk62J0enoPf4hccPTHwfiYezGQyYXenJYH0B0xHuTZKARcIq21PYsZOZv+nNHJ XoX/y9g76kQnSUBg== To: Sergey Senozhatsky , Andrew Morton , Petr Mladek Cc: Feng Tang , linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: Re: [PATCH] panic: remove redundant panic-cpu backtrace In-Reply-To: <20250731030314.3818040-1-senozhatsky@chromium.org> References: <20250731030314.3818040-1-senozhatsky@chromium.org> Date: Thu, 31 Jul 2025 09:15:02 +0206 Message-ID: <84seichm5t.fsf@jogness.linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On 2025-07-31, Sergey Senozhatsky wrote: > SYS_INFO_ALL_CPU_BT sends NMI backtrace request to > all CPUs, which dumps an extra backtrace on panic CPU. Isn't this only true if CONFIG_DEBUG_BUGVERBOSE=y? Also, the information is not the same. trigger_all_cpu_backtrace() will also dump the registers. For CONFIG_DEBUG_BUGVERBOSE=y on the panic CPU, only the stack is dumped. John Ogness