From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 50FF4403B13 for ; Wed, 9 Sep 2026 09:47:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788947246; cv=none; b=PkkJ4qgyxNEe4Bh4c6QcMB80cpEKo4LaxGvf0YreWpVarsUQEqU9cJD81w0ejNoKsF2gRqrgyWp6ovLcTAEQbmvzGPjPXMDcw5WxzAz+29ByaFVJK4I53gQPGjcrKUPWCqJLeoD1hOlBQYKLgHdD9KK53McFui2gJ5Of4k7fNP4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788947246; c=relaxed/simple; bh=Utri6bHR6wO4161z6u+ryirqdAdkSAv2sYPAFDcYRNI=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=TZtcJuAK1Fy4tSJVxxiZuhr9yjWFQQOcIWhJArdOV2YYpJ/sHwN23UAO3r6l8O06+EpAwy9xUbTaqd8c1/++xHt72ORq4NOUO2pYPgbkJTzPlHzDu9HEuKERp+rlrXNj4dWDYvj4lOJMnsqQSa0UsP1/Ku99Tb0X29kOA3f63gU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=x6tnqdjE; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="x6tnqdjE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB3F91F00A3A; Wed, 9 Sep 2026 09:47:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788947245; bh=ftMquIJ+3AeFGbFon1Wnl2BGIgNMXAr/ySpIyrUF7d0=; h=Subject:To:Cc:From:Date; b=x6tnqdjEuK/V0YxCisDSIrRr0I0UQJK50LRAC8INANXx/doGYJkOKpBeIJ8Zzimgd gGjCDol9JGsdiAM9VzsrJDu9ajJ+zXNFH4sCk2F7azDGOlTVT0N1Bkr+ZFQLDsH326 96U0ONdLYx4TjSPtRGB4h8MFaT0kd1MLT8ccEpYw= Subject: FAILED: patch "[PATCH] nvme: add missing SRCU grace period in error path" failed to apply to 5.15-stable tree To: tristan@talencesecurity.com,hch@lst.de,john.g.garry@oracle.com,kbusch@kernel.org,sagi@grimberg.me Cc: From: Date: Wed, 09 Sep 2026 11:43:41 +0200 Message-ID: <2026090941-alumni-snare-26ce@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x ef248d5de4469fb6bbaf8dbe0c4c47800080d648 # git commit -s git send-email --to '' --in-reply-to '2026090941-alumni-snare-26ce@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ef248d5de4469fb6bbaf8dbe0c4c47800080d648 Mon Sep 17 00:00:00 2001 From: Tristan Madani Date: Sat, 15 Aug 2026 00:14:27 +0000 Subject: [PATCH] nvme: add missing SRCU grace period in error path nvme_alloc_ns() error path at out_unlink_ns removes ns from the namespace head siblings list with list_del_rcu(&ns->siblings) but does not wait for SRCU readers before freeing the namespace struct. Multipath code iterates the head->list under srcu_read_lock() in nvme_find_path() and nvme_mpath_revalidate_paths(), so a concurrent reader can still hold a reference to ns when kfree(ns) runs. The normal removal path in nvme_ns_remove() correctly calls synchronize_srcu(&ns->head->srcu) after list_del_rcu() to wait for in-progress readers. Add the same grace period in the error path. Fixes: ed754e5deeb1 ("nvme: track shared namespaces") Cc: stable@vger.kernel.org Signed-off-by: Tristan Madani Reviewed-by: Sagi Grimberg Reviewed-by: John Garry Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 5f2744be7388..9739ce38b73a 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4345,6 +4345,9 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info) last_path = true; } mutex_unlock(&ctrl->subsys->lock); + + /* guarantee not available in head->list */ + synchronize_srcu(&ns->head->srcu); if (last_path) nvme_put_ns_head(ns->head); nvme_put_ns_head(ns->head);