From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3B708CC6B3A for ; Thu, 15 Oct 2026 11:23:10 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1xHJWp-0002g6-VI; Thu, 15 Oct 2026 07:21:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xHJWf-0002Yb-3U for qemu-devel@nongnu.org; Thu, 15 Oct 2026 07:21:33 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xHJWd-000464-Em for qemu-devel@nongnu.org; Thu, 15 Oct 2026 07:21:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1792063290; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gTnJllB9fustWggRt0G/FCD+pXdMXjfOMHK6D5h8GU4=; b=FjvjMv8/DmzJb/kKnivUhc1xhgIO4uHQ4jq58b1rbDn6IBE9rZelnZrjTPx2t/+2XN506L qiGyc8Lgb0nvaKNcPfiX6aWDbtigcPf/Oh2w59ZxXYFVJ35zOGjQabeNdrhEB20Z68J17M Xf4vKj5g0ssYvtFK7zFMF0xwJ7g0OWg= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-424-RtYVXydaNfCnE3YxBIVcRg-1; Thu, 15 Oct 2026 11:21:27 +0000 X-MC-Unique: RtYVXydaNfCnE3YxBIVcRg-1 X-Mimecast-MFC-AGG-ID: RtYVXydaNfCnE3YxBIVcRg_1792063286 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1471D18002E6; Thu, 15 Oct 2026 11:21:26 +0000 (UTC) Received: from berrange.csb (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 750951800257; Thu, 15 Oct 2026 11:21:22 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Michael Roth , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Fabiano Rosas , Richard Henderson , "Dr. David Alan Gilbert" , Paolo Bonzini , Markus Armbruster , Pierrick Bouvier , Eric Blake , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Laurent Vivier Subject: [PATCH 09/21] system: trigger TLDR crash dump on unhandled SIGBUS Date: Thu, 15 Oct 2026 12:20:32 +0100 Message-ID: <20261015112044.1999748-10-berrange@redhat.com> In-Reply-To: <20261015112044.1999748-1-berrange@redhat.com> References: <20261015112044.1999748-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.24, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org QEMU currently installs a SIGBUS handler which either forwards MCEs to KVM, or re-raises the SIGBUS. Leave MCE handling untouched, but wire up other to trigger the TLDR crash dump in the re-raise scenario. Signed-off-by: Daniel P. Berrangé --- system/signal.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/system/signal.c b/system/signal.c index dc5a75e2816..f667b56255d 100644 --- a/system/signal.c +++ b/system/signal.c @@ -27,6 +27,7 @@ #include "hw/core/cpu.h" #include "system/kvm.h" #include "qemu/error-report.h" +#include "qemu/tldr.h" #ifdef CONFIG_LINUX @@ -48,7 +49,7 @@ #ifdef CONFIG_LINUX -static void sigbus_reraise(void) +static void sigbus_reraise(siginfo_t *siginfo) { sigset_t set; struct sigaction action; @@ -56,6 +57,7 @@ static void sigbus_reraise(void) memset(&action, 0, sizeof(action)); action.sa_handler = SIG_DFL; if (!sigaction(SIGBUS, &action, NULL)) { + qtldr_crash_dump_signal(siginfo); raise(SIGBUS); sigemptyset(&set); sigaddset(&set, SIGBUS); @@ -69,19 +71,19 @@ static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx) { if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) { - sigbus_reraise(); + sigbus_reraise(siginfo); } if (current_cpu) { /* Called asynchronously in VCPU thread. */ if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) { - sigbus_reraise(); + sigbus_reraise(siginfo); } } else { /* Called synchronously (via signalfd) in main thread. */ if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) { - sigbus_reraise(); + sigbus_reraise(siginfo); } } } -- 2.56.0