From: Jakub Kicinski <kuba@kernel.org>
To: Gustavo Luiz Duarte <gustavold@gmail.com>
Cc: Breno Leitao <leitao@debian.org>,
Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Matthew Wood <thepacketgeek@gmail.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] netconsole: Acquire su_mutex before navigating configs hierarchy
Date: Fri, 31 Oct 2025 17:54:46 -0700 [thread overview]
Message-ID: <20251031175446.24e280fa@kernel.org> (raw)
In-Reply-To: <20251029-netconsole-fix-warn-v1-1-0d0dd4622f48@gmail.com>
On Wed, 29 Oct 2025 13:50:24 -0700 Gustavo Luiz Duarte wrote:
> There is a race between operations that iterate over the userdata
> cg_children list and concurrent add/remove of userdata items through
> configfs. The update_userdata() function iterates over the
> nt->userdata_group.cg_children list, and count_extradata_entries() also
> iterates over this same list to count nodes.
Teaching syzbot how to create a netconsole would probably go a long way
towards catching these sort of issues. Looks like right now syzbot has
coverage only for the paths that don't need a target:
https://syzkaller.appspot.com/upstream/coverage?period=month
next prev parent reply other threads:[~2025-11-01 0:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-29 20:50 Gustavo Luiz Duarte
2025-11-01 0:54 ` Jakub Kicinski [this message]
2025-11-01 1:00 ` patchwork-bot+netdevbpf
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