linux-kernel - Re: [PATCH v3 08/18] nvmet-fcloop: add missing fcloop_callback_host

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Message-ID: <4cb3543d-c3a3-4cf5-9615-ea13780b31d0@flourine.local>
Date: Thu, 3 Apr 2025 15:25:48 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Hannes Reinecke <hare@...e.de>
Cc: Daniel Wagner <wagi@...nel.org>, 
	James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
	Chaitanya Kulkarni <kch@...dia.com>, Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/18] nvmet-fcloop: add missing
 fcloop_callback_host_done

On Wed, Apr 02, 2025 at 07:08:06PM +0200, Daniel Wagner wrote:
> > There is NULL pointer check in fcloop_call_host_done eventually. It is
> > in 'nvmet-fcloop: update refs on tfcp_req'. That hunk should be in this
> > patch though.
> 
> Looking again with fresh eyes. Patch #3 is adding ref counting to the
> lport. 'nvmet-fcloop: update refs on tfcp_req' (the patch before this
> one) adds the NULL check. Nothing will crash here. Actually, I've run
> into this crash when testing before the NULL check was there :)

After a bit more testing and a new KASAN report, it looks like yet
another life tracking for tfcp_req/fcpreq is a bit off. The whole
conditional free/put indicates a something is wrong IMO. Let me see if I
can resovle this a bit cleaner.