From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=170.10.129.124 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794427383; b=xUks+mwrSpxM2MEoaoXjUaIpFON+dHJg5M8Y4xJhvIQYnnKBbm3z6SOf+gMblE0ynv5m Rv56R3hpUrPVIud8AE/KvMf14bonBQfYF6A5CPn83iGEiqhUhGi5X1LpPFvoVNaP21MPL mezOCTpDvWrMMGYYmGWqKTh9KYuw/jePMWZOJJuWBgIESZa71u73k5Yc8EBow03kwuTo0 NqTeA5J+T4EGSw/QMPwqFsxXi4jFKyVROtdX7ojOcRbw9MTpS/EMPGxrtr5fxgkSf4zVg IyGJbpvBkzk5Otl1pU+EtUbA8Yc57O9G40kVRbWOGU82o1c4T1/rX8ENAGmq38o3ZWg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794427383; h=DMARC-Filter:DKIM-Signature:Received:X-MC-Unique: X-Mimecast-MFC-AGG-ID:Received:Received:Received:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To:X-Scanned-By; bh=e6r/HJ4fnxt+Ympvhnm3lqzuKNTZyC1RsNKqAM3ic5c=; b=Lt6ElT62/DsgY5CJz468ES5FoiblJmijGE9aocv1E0M/rAnNvYD2FCYGU7mP+gnKqtmz eN+k7ZjuigMSt5bXrEB4WqV1wbEkLtf5koJDDhs5gX7wT+eH7vgRrfjn1r61BF17f/XK1 IfP4NSgPqvHFrKME8SWATIQszD8nIb68cKLVPlEj8F+5Vaa+o7DnBxrJkaC81JvcUygDv l+fffoEDVJBfrlxsAV2a3seIsZw/90hjVrwUQ2rI5qoIxdImDnnYwL/83sv2eePj8RCQz CItCxlI8GV9igo07L+NCJOpp/zeGoOyi+9Z3VQd1vr/hl0Ne7mbcBnrEryWzougDs2Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=JIXngPCc; arc=none smtp.remote-ip=170.10.129.124 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F0B7B606A31C for ; Wed, 11 Nov 2026 20:03:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org F0B7B606A31C Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=JIXngPCc DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1794427381; 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=e6r/HJ4fnxt+Ympvhnm3lqzuKNTZyC1RsNKqAM3ic5c=; b=JIXngPCchcdeLowV2YkelDEti6DqmGFF31mEYTYAIb8IpgdXanLtQrfIK0PCL0WENVRJRb uE3/Bi83EWIKs8NN2ckCGcc/SHjZYl11d3zZafM+ZEdopxY1lqeaugHaviGheeHjDhKTyU QgrYfw5+s8ErrJcCkarZwJbAgmMHcP8= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-459-AM8UFLq6MNq3UAZpDWmj8w-1; Wed, 11 Nov 2026 15:02:57 -0500 X-MC-Unique: AM8UFLq6MNq3UAZpDWmj8w-1 X-Mimecast-MFC-AGG-ID: AM8UFLq6MNq3UAZpDWmj8w_1794427375 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0F6E219C960E; Wed, 11 Nov 2026 20:02:44 +0000 (UTC) Received: from onestero-thinkpadp1gen7.tpbc.csb (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id C57E3344; Wed, 11 Nov 2026 20:02:39 +0000 (UTC) Received: by onestero-thinkpadp1gen7.tpbc.csb (nbSMTP-1.00) for uid 13628 oleg@redhat.com; Wed, 11 Nov 2026 21:02:43 +0100 (CET) Date: Wed, 11 Nov 2026 21:02:38 +0100 From: Oleg Nesterov To: Breno Leitao Cc: "Peter Zijlstra (Intel)" , Nicholas Piggin , "Eric W. Biederman" , Matthias Brugger , AngeloGioacchino Del Regno , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, kernel-team@meta.com, syzbot+8fdf0d8e10bdde1c2e88@syzkaller.appspotmail.com, stable@vger.kernel.org Subject: Re: [PATCH] reboot: halt when power off fails Message-ID: References: <20261110-reboot-make-task-dead-v1-1-af88a3f37bf7@debian.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261110-reboot-make-task-dead-v1-1-af88a3f37bf7@debian.org> X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 On 11/10, Breno Leitao wrote: > > --- a/kernel/reboot.c > +++ b/kernel/reboot.c > @@ -791,6 +791,9 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, > > case LINUX_REBOOT_CMD_POWER_OFF: > kernel_power_off(); > + pr_emerg("Power off failed: System halted instead\n"); > + /* kernel_power_off() already ran the shutdown, only halt. */ > + machine_halt(); Agreed. Even if I don't think my ack has any value in this area: Acked-by: Oleg Nesterov