From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 4834C432E4; Thu, 9 Nov 2023 13:34:03 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 0DEAE402F0; Thu, 9 Nov 2023 13:34:03 +0100 (CET) Received: from inbox.dpdk.org (inbox.dpdk.org [95.142.172.178]) by mails.dpdk.org (Postfix) with ESMTP id 49DEE402F1 for ; Thu, 9 Nov 2023 13:34:01 +0100 (CET) Received: by inbox.dpdk.org (Postfix, from userid 33) id 3B883432E5; Thu, 9 Nov 2023 13:34:01 +0100 (CET) From: bugzilla@dpdk.org To: dev@dpdk.org Subject: [Bug 1312] When iterating through the mbufs, mbuf->nb_segs indicates there are 21 segments, but when reaching the 8th mbuf, its mbuf->next pointer is NULL Date: Thu, 09 Nov 2023 12:34:01 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: core X-Bugzilla-Version: 20.11 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: tingsong.zheng@gmail.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: dev@dpdk.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: multipart/alternative; boundary=16995332410.3c82fD6.352740 Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 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 --16995332410.3c82fD6.352740 Date: Thu, 9 Nov 2023 13:34:01 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All https://bugs.dpdk.org/show_bug.cgi?id=3D1312 Bug ID: 1312 Summary: When iterating through the mbufs, mbuf->nb_segs indicates there are 21 segments, but when reaching the 8th mbuf, its mbuf->next pointer is NULL Product: DPDK Version: 20.11 Hardware: ARM OS: Linux Status: UNCONFIRMED Severity: normal Priority: Normal Component: core Assignee: dev@dpdk.org Reporter: tingsong.zheng@gmail.com Target Milestone: --- The version of DPDK is 20.11. When iterating through the mbufs, mbuf->nb_segs indicates there are 21 segments, but when reaching the 8th mbuf, its mbuf->next pointer is NULL. I used ASAN tool to check and found no memory out-of-bounds errors before encountering the NULL value in the mbuf's 'next' pointer. My scenario involves sending approximately 30,000 large packets using a sen= der via the kernel protocol stack, where the network card's MTU is 1500. On the receiver side, I'm using DPDK to capture these packets. In Thread 1, I'm receiving the packets using rte_eth_rx_burst, then processing them through = the IP fragment reassembly process. Upon receiving a complete packet, I enqueue= the mbuf into an 'rte_ring' named 'test'. In Thread 2, I dequeue the mbufs from= the 'test' rte_ring. I then iterate through these mbufs to copy data from each segment mbuf. However, I encounter an issue with some mbufs having a 'next' pointer set as NULL." --=20 You are receiving this mail because: You are the assignee for the bug.= --16995332410.3c82fD6.352740 Date: Thu, 9 Nov 2023 13:34:01 +0100 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All
Bug ID 1312
Summary When iterating through the mbufs, mbuf->nb_segs indicates = there are 21 segments, but when reaching the 8th mbuf, its mbuf->next po= inter is NULL
Product DPDK
Version 20.11
Hardware ARM
OS Linux
Status UNCONFIRMED
Severity normal
Priority Normal
Component core
Assignee dev@dpdk.org
Reporter tingsong.zheng@gmail.com
Target Milestone --- 

The version of DPDK is 20.11.

When iterating through the mbufs, mbuf->nb_segs indicates there are 21
segments, but when reaching the 8th mbuf, its mbuf->next pointer is NULL.

I used ASAN tool to check and found no memory out-of-bounds errors before
encountering the NULL value in the mbuf's 'next' pointer.

My scenario involves sending approximately 30,000 large packets using a sen=
der
via the kernel protocol stack, where the network card's MTU is 1500. On the
receiver side, I'm using DPDK to capture these packets. In Thread 1, I'm
receiving the packets using rte_eth_rx_burst, then processing them through =
the
IP fragment reassembly process. Upon receiving a complete packet, I enqueue=
 the
mbuf into an 'rte_ring' named 'test'. In Thread 2, I dequeue the mbufs from=
 the
'test' rte_ring. I then iterate through these mbufs to copy data from each
segment mbuf. However, I encounter an issue with some mbufs having a 'next'
pointer set as NULL."

You are receiving this mail because:
  • You are the assignee for the bug.
=20=20=20=20=20=20=20=20=20=20
= --16995332410.3c82fD6.352740--