From nobody Thu Sep 24 18:38:17 2026 Received: from mail-oa1-f72.google.com (mail-oa1-f72.google.com [209.85.160.72]) (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 AC9774CEE47 for ; Mon, 21 Sep 2026 18:47:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790016474; cv=none; b=Ap8rFYHh8tzAMyj1gh4moVIi5HpUPsDTJ3Lg/gBSWnLsqHP8njSd4qO1JWB8pRhk2nbkdhgfVIevKVA+22EYFy1iv7gH5xgg5Z9Bin6/WcDjsOL0WnTQMzxwKjcnJJc6u0UoSr354poaKbtO+LssopqDtHam21surx1cN27zJfk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790016474; c=relaxed/simple; bh=OlViH/mKLqResLQvZhJ/ir+drLOf2g0Hor5oPIMQuoA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=Bwbb0+OaAU3gQRf3saMmcVeSShJail6ai0aa2NbGCnOY94WsTQQvtCWSB6ZST7saN7yvmXSmzVQ0ctmuZhserUZtCKb3o0WorM7ZTQv8DH0GcdFAs2LwcXA+uSQ0dtAZo0KyZax/07gHKYHFYjZTWCMFtClUOYUab3F43tBtRWI= 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=209.85.160.72 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-oa1-f72.google.com with SMTP id 586e51a60fabf-4519ef1babeso3898612fac.2 for ; Mon, 21 Sep 2026 11:47:52 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790016471; x=1790621271; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=0gWuR9+t+u+i4XSSsnUX2MmPcJSj85k7+RQDQYDUOTY=; b=xtDkAhsyd5FNRpVAeZhKTNRPHb3fSkiN1t63IUgfL20YCPvOtv87SLofej8XsKIxvx fCzYxx/vjoLlkiypmd2VDdyyEeyhFHm/eQbIKIRlnaGFU5iGvAuLKmKv096eoKACuiW8 4HC7E2JeLtlG9Gm+K1Jc0NS/0MZ86UxApvows09H1PG6Ce2acPjb4hvWlyd0GUPbrPzh V/jnrgMRNzDLQmMJl5SP4kkUx98Yc/BvxdMdJqqjyWbv2yKnd0SnDgnikZYB4d3m2YvE QZySijGzLeHpjr4kSTteF0N4LYIpxBxu3bPEFvCyGOBjSz/dN6mOMvCScQmmOyG3ivCB ciOg== X-Gm-Message-State: AFuF++l+J3PH65n/rFX48dOiISHx1JOaoLhKOt6O5VESilTXN/g/aDfz lkhDCAMFup2HXg8mxHvYHQtDC/RhGn7A5XQ+a5U+nq6XZI995NGGDrAv2zQ2fhZrZyxggkmCRDO 1Jiu3ywyM5JcDaBoXLFir/gtcohMBDXouHAs/Ihe39Rzgx6ye2JPXQlPP7/Y= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:208b:b0:6bd:5506:aadc with SMTP id 006d021491bc7-6ca9c058e28mr10626138eaf.35.1790016471634; Mon, 21 Sep 2026 11:47:51 -0700 (PDT) Date: Mon, 21 Sep 2026 11:47:51 -0700 In-Reply-To: <6aa86682.f81106d8.2ab401.0056.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab17bd7.3179f8cd.1e36b2.0024.GAE@google.com> Subject: Forwarded: Re: [syzbot] [block?] WARNING: suspicious RCU usage in mas_start (2) From: syzbot To: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [block?] WARNING: suspicious RCU usage in mas_start (= 2) Author: paolobertinetti200f4@proton.me #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.g= it master diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 66eb55e71..7a64745e1 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -5628,6 +5628,8 @@ static bool ublk_try_buf_match(struct ublk_device *ub, unsigned long expected_offset =3D 0; bool first =3D true; =20 + guard(rcu)(); + rq_for_each_bvec(bv, rq, iter) { unsigned long pfn =3D page_to_pfn(bv.bv_page); unsigned long end_pfn =3D pfn + base-commit: 93f51579e7df248780214094418f205253383cc5