linux-kernel - Re: Kernel OOPS while creating a NVMe Namespace

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Message-ID: <ZmdLlaVO-QUug5aj@kbusch-mbp.dhcp.thefacebook.com>
Date: Mon, 10 Jun 2024 12:53:09 -0600
From: Keith Busch <kbusch@...nel.org>
To: Venkat Rao Bagalkote <venkat88@...ux.vnet.ibm.com>
Cc: sagi@...mberg.me, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	sachinp@...ux.vnet.com
Subject: Re: Kernel OOPS while creating a NVMe Namespace

On Mon, Jun 10, 2024 at 01:21:00PM +0530, Venkat Rao Bagalkote wrote:
> 
> Issue is introduced by the patch: be647e2c76b27f409cdd520f66c95be888b553a3.

My mistake. The namespace remove list appears to be getting corrupted
because I'm using the wrong APIs to replace a "list_move_tail". This is
fixing the issue on my end:

---
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 7c9f91314d366..c667290de5133 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3959,9 +3959,10 @@ static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
 
 	mutex_lock(&ctrl->namespaces_lock);
 	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
-		if (ns->head->ns_id > nsid)
-			list_splice_init_rcu(&ns->list, &rm_list,
-					     synchronize_rcu);
+		if (ns->head->ns_id > nsid) {
+			list_del_rcu(&ns->list);
+			list_add_tail_rcu(&ns->list, &rm_list);
+		}
 	}
 	mutex_unlock(&ctrl->namespaces_lock);
 	synchronize_srcu(&ctrl->srcu);
--