From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754952AbaKSJl5 (ORCPT ); Wed, 19 Nov 2014 04:41:57 -0500 Received: from p3plsmtps2ded03.prod.phx3.secureserver.net ([208.109.80.60]:54696 "EHLO p3plsmtps2ded03.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751265AbaKSJlz (ORCPT ); Wed, 19 Nov 2014 04:41:55 -0500 x-originating-ip: 72.167.245.219 From: Dexuan Cui To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, driverdev-devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, jasowang@redhat.com Cc: kys@microsoft.com, haiyangz@microsoft.com Subject: [PATCH] tools: hv: ignore ENOBUFS in the KVP daemon Date: Wed, 19 Nov 2014 02:50:45 -0800 Message-Id: <1416394245-31717-1-git-send-email-decui@microsoft.com> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Under high memory pressure and very high KVP R/W test pressure, the netlink recvfrom() may transiently return ENOBUFS to the daemon -- we found this during a 2-week stress test. We'd better not terminate the daemon on this failure, because a typical KVP user can re-try the R/W and hopefully it will succeed next time. Cc: K. Y. Srinivasan Signed-off-by: Dexuan Cui --- tools/hv/hv_kvp_daemon.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c index 22b0764..9f4b303 100644 --- a/tools/hv/hv_kvp_daemon.c +++ b/tools/hv/hv_kvp_daemon.c @@ -1559,8 +1559,15 @@ int main(int argc, char *argv[]) addr_p, &addr_l); if (len < 0) { + int saved_errno = errno; syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s", addr.nl_pid, errno, strerror(errno)); + + if (saved_errno == ENOBUFS) { + syslog(LOG_ERR, "error = ENOBUFS: ignored"); + continue; + } + close(fd); return -1; } -- 1.9.1