From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Blunck Subject: [PATCH] log: Properly reset log_history_size in rte_log_dump_history() Date: Fri, 29 May 2015 12:34:48 +0200 Message-ID: <1432895688-1728-1-git-send-email-jblunck@infradead.org> To: dev@dpdk.org Return-path: Received: from mail-wi0-f179.google.com (mail-wi0-f179.google.com [209.85.212.179]) by dpdk.org (Postfix) with ESMTP id CE45658E4 for ; Fri, 29 May 2015 12:35:25 +0200 (CEST) Received: by wizo1 with SMTP id o1so18063009wiz.1 for ; Fri, 29 May 2015 03:35:25 -0700 (PDT) Received: from linux-04uu.site.eng.vyatta.net (port-92-196-75-134.dynamic.qsc.de. [92.196.75.134]) by mx.google.com with ESMTPSA id ny7sm2463585wic.11.2015.05.29.03.35.24 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 29 May 2015 03:35:25 -0700 (PDT) List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" In rte_log_dump_history() the log_history list is reinitialized without resetting the log_history_size. In the next call to rte_log_add_in_history() the log_history_size > RTE_LOG_HISTORY and the code unconditionally tries to remove the first entry: Program received signal SIGSEGV, Segmentation fault. rte_log_add_in_history ( buf=buf@entry=0x7f02035cd000 "DATAPLANE: 9:dp0s7 link RTM_NEWLINK [dp0s7] \nCAST,LOWER_UP>\n", size=size@entry=86) at /usr/src/packages/BUILD/lib/librte_eal/common/eal_common_log.c:122 Signed-off-by: Jan Blunck --- lib/librte_eal/common/eal_common_log.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/lib/librte_eal/common/eal_common_log.c b/lib/librte_eal/common/eal_common_log.c index fe3d7d5..cb4311c 100644 --- a/lib/librte_eal/common/eal_common_log.c +++ b/lib/librte_eal/common/eal_common_log.c @@ -119,7 +119,8 @@ rte_log_add_in_history(const char *buf, size_t size) /* get a buffer for adding in history */ if (log_history_size > RTE_LOG_HISTORY) { hist_buf = STAILQ_FIRST(&log_history); - STAILQ_REMOVE_HEAD(&log_history, next); + if (hist_buf) + STAILQ_REMOVE_HEAD(&log_history, next); } else { if (rte_mempool_mc_get(log_history_mp, &obj) < 0) @@ -234,6 +235,7 @@ rte_log_dump_history(FILE *out) rte_spinlock_lock(&log_list_lock); tmp_log_history = log_history; STAILQ_INIT(&log_history); + log_history_size = 0; rte_spinlock_unlock(&log_list_lock); for (i=0; i