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Mon, 24 Jun 2024 05:20:05 -0400 X-MC-Unique: tob0ggXUOPSdqbbrVvNrxg-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F20BC19560B5; Mon, 24 Jun 2024 09:20:04 +0000 (UTC) Received: from [10.39.208.31] (unknown [10.39.208.31]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 15AFD1956087; Mon, 24 Jun 2024 09:20:03 +0000 (UTC) Message-ID: <4a43b1af-cab5-4ce9-b0b0-e5d8e7e18af6@redhat.com> Date: Mon, 24 Jun 2024 11:20:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] vhost: Fix the crash caused by accessing the released memory To: zhaoxinxin <15957197901@163.com>, dev@dpdk.org References: <20240619122739.42573-1-15957197901@163.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Hi, On 6/19/24 14:27, zhaoxinxin wrote: > The rte_vhost_driver_unregister() vhost_user_read_cb() > vhost_user_client_reconnect() can be called at the same time by 3 threads. > when memory of vsocket is freed in rte_vhost_driver_unregister(), > then vhost_user_read_cb() maybe add vsocket to reconn_list, > the invalid memory of vsocket is accessed in vhost_user_client_reconnect(). It is not clear to me why 3 threads are calling rte_vhost_driver_unregister() at the same time, isn't it an application issue? > The core trace is: > Program terminated with signal 11, Segmentation fault. > The fix is to perform a delete operation again after releasing the memory > We need a Fixes tag and Cc stable@dpdk.org so that it is backported. > Signed-off-by: zhaoxinxin <15957197901@163.com> The format is Firstname Lastname > --- > lib/vhost/socket.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c > index a75728a2e4..01946096c4 100644 > --- a/lib/vhost/socket.c > +++ b/lib/vhost/socket.c > @@ -1121,6 +1121,8 @@ rte_vhost_driver_unregister(const char *path) > if (vsocket->is_server) { > close(vsocket->socket_fd); > unlink(path); > + } else if (vsocket->reconnect) { > + vhost_user_remove_reconnect(vsocket); > } > > pthread_mutex_destroy(&vsocket->conn_mutex);