From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f70.google.com (mail-ot1-f70.google.com [209.85.210.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A30031352A for ; Wed, 20 May 2026 08:48:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779266913; cv=none; b=DoClb/vqi+JC0wmHBFzn5rH5T8vGO2h9yLTWS2Irwymn5edb7uQdfqnykk4F/HOzbrTZQfBaiGfUHz2w2ilmykBBmSwrb90SvIuQuZYffkAX9qxbvi2T21kuwAdrohxCkMsgyP4akzSQOE1Fl75h/9Pi7utt5AiW+YGmvJsQnQw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779266913; c=relaxed/simple; bh=aleZzVNLSjL5Gg1qI066lJmu+0IirwtGQSDiE3nHev8=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=quJR14AmklNbXSMP2ikUje4mXEMBX3WobTboylot0v0ERRBslZafkzB1KiXEiap7LWaAe+AA8iQsgp7fHWFZauy9E9xIP7ANxzZCw9Rfha0N2gOPYKf0aBLgQEHhPydW5kQHMRCX+UKyb7ZaEj5jgd7puX9qHntM93oAMRSOc3U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f70.google.com with SMTP id 46e09a7af769-7dbd50dee52so15227737a34.2 for ; Wed, 20 May 2026 01:48:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779266911; x=1779871711; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Tl1vm06hYsMkH6VNhlfsh0WIx5fYqNXPhoKcfb3VCeI=; b=om+fePSiyVuUYm5mR1bFLxSfR4GLFl3doBXy6xaTuk/0HNQeuPu0RFH5AjAI3FGdSe syY32pm5ywlsayJjktJRlRIBEi2rj9x0wYOPGEx1LgJNjyCsy6ycgl5LCp/F7ULZ6pTB BqI7h7iY816rkcxBdb2NHqf+RHxD3L7SQPOF6fQ5FaQcgpCwCEHrmTfwiCZc4ekNOse7 iwRzMiMf7MOPPENZuEnVhtnL3/lUkaDjQeVUwaY7WD62OHLbdWm1eP8x7SpfykbRwVNt WJ39zaG8MJR343Xp9sCRQo3Hpb+0G9IBv82tv5VVLHU0zFenRb3dyleZEucwTeUQo+c0 xSjw== X-Forwarded-Encrypted: i=1; AFNElJ+KavUxC56lp+jxLirk8icz4ryz1eViKc1aT9d7arJQdkqSu13yWcLd3GkBIKZUXDgTXuRmgb6afHVi0dU=@vger.kernel.org X-Gm-Message-State: AOJu0Yzy4pipCJB916byazsRwKoMOndlkrgIPkg3tzZvHRF7AuC306Ik /SkTkA3ov+pyWqItOzwUVagRYFtV9Yom7j4eIk8nby/lNYHm1kLPQgIw+3THO5x7pg/y/t8NlsH pCBK/aZdNLC5p4FvdoEVq2kNyvZDcFxHTi26eK9tLnITEDHhZt7FmSzMPBVI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:602:b0:688:c97d:bfc3 with SMTP id 006d021491bc7-69c9437cd86mr14569700eaf.38.1779266911566; Wed, 20 May 2026 01:48:31 -0700 (PDT) Date: Wed, 20 May 2026 01:48:31 -0700 In-Reply-To: <20260520084826.6246-1-souradiptodas6@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0d755f.170a0220.3cbd30.013f.GAE@google.com> Subject: Re: #syz test From: syzbot To: souradiptodas6@gmail.com Cc: souradiptodas6@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" > From c3f773691e3c568d67d8628ffd4b7cf25ba8e150 Mon Sep 17 00:00:00 2001 > From: Souradipto Das > Date: Wed, 20 May 2026 14:11:05 +0530 > Subject: [PATCH] #syz test KVM: x86/xen: Secure gpc refresh_lock mutual > exclusion in shared info init > > --- > arch/x86/kvm/xen.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c > index 91fd3673c09a..421e4359ce0d 100644 > --- a/arch/x86/kvm/xen.c > +++ b/arch/x86/kvm/xen.c > @@ -45,6 +45,8 @@ static int kvm_xen_shared_info_init(struct kvm *kvm) > int ret = 0; > int idx = srcu_read_lock(&kvm->srcu); > > + mutex_lock(&gpc->refresh_lock); > + > read_lock_irq(&gpc->lock); > while (!kvm_gpc_check(gpc, PAGE_SIZE)) { > read_unlock_irq(&gpc->lock); > @@ -101,6 +103,7 @@ static int kvm_xen_shared_info_init(struct kvm *kvm) > kvm_make_all_cpus_request(kvm, KVM_REQ_MASTERCLOCK_UPDATE); > > out: > + mutex_unlock(&gpc->refresh_lock); > srcu_read_unlock(&kvm->srcu, idx); > return ret; > } > -- > 2.43.0 > This crash does not have a reproducer. I cannot test it.