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 F33F936F916 for ; Wed, 9 Sep 2026 09:47:19 +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=1788947241; cv=none; b=iCrul4t97e8V6gzDu0nP0fDiMUYRAVo5CGgee8ktdJykSKBOHq7sdZadDw0ZeU5ABxaAfWfD/+XJDhypUDOMlTakjQSViCvcwtjC/gxm5mK114JmigEefno1hN/10wwwCDsMDrGhzuPGu15NAhvyFGs/B3bIr2ygKPyOYL8dunE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788947241; c=relaxed/simple; bh=zcAPeNoB2c7nlKwZb64sEFnRTccGy4XTgV77XYJ0+KA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=QxlFF8y72uXUprCPTY51+Ff+tyVoVI205ylNv5FJF3Rc6c+tOCC0PLf30tRz53f3JAFCArsym3NMAP4xDfdUPD/AIzgSPdKKvGknolxsMXpcpU3N6jJwvZ9qV5gDzOM6YkS4XcZoxmTMZJhLqkfOrnKiUc9byP7G6Qz5fhU7Lbc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tB4X4xCR; 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="tB4X4xCR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 11AF71F00A3A; Wed, 9 Sep 2026 09:47:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788947239; bh=4FXyxw5N98S+X2v3tovKFbaPOKGJz/AwkXXrdZOpCKY=; h=Subject:To:Cc:From:Date; b=tB4X4xCRddLl5pOqMYr2OND0QBSRxw/rur/5OkWW1KGPijB+oTTEj0Fw1pS6Usltj Iwd/rXhEji4rMlSzmlSrgZjqCUZWutjVyNc3DsjHwROHuCc5NMwEZhwGm6wgWm2URR RiLW44ud8BQC7JSgSzK9RNPEDdePXypAD7nE+BlQ= Subject: FAILED: patch "[PATCH] nvme: add missing SRCU grace period in error path" failed to apply to 6.12-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 11:43:40 +0200 Message-ID: <2026090940-spray-energy-c72e@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 6.12-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-6.12.y git checkout FETCH_HEAD git cherry-pick -x ef248d5de4469fb6bbaf8dbe0c4c47800080d648 # git commit -s git send-email --to '' --in-reply-to '2026090940-spray-energy-c72e@gregkh' --subject-prefix 'PATCH 6.12.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);