From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Guo Subject: [PATCH] doc: add known igb_uio device hot-unplug issue Date: Tue, 20 Nov 2018 23:09:31 +0800 Message-ID: <1542726571-121934-1-git-send-email-jia.guo@intel.com> Cc: dev@dpdk.org, jia.guo@intel.com, helin.zhang@intel.com, konstantin.ananyev@intel.com, shaopeng.he@intel.com, stephen@networkplumber.org, bruce.richardson@intel.com, gaetan.rivet@6wind.com To: marko.kovacevic@intel.com, john.mcnamara@intel.com, qi.z.zhang@intel.com, ferruh.yigit@intel.com, thomas@monjalon.net Return-path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 8B6C891 for ; Tue, 20 Nov 2018 16:06:12 +0100 (CET) List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" When device has been bound to igb_uio driver and application is running, hot-unplugging the device may cause kernel crash. Signed-off-by: Jeff Guo --- doc/guides/rel_notes/known_issues.rst | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst index 95e4ce6..dfe0565 100644 --- a/doc/guides/rel_notes/known_issues.rst +++ b/doc/guides/rel_notes/known_issues.rst @@ -759,3 +759,24 @@ Netvsc driver and application restart **Driver/Module**: ``uio_hv_generic`` module. + + +kernel crash when hot-unplug igb_uio device while DPDK application is running +----------------------------------------------------------------------------- + +**Description**: + When device has been bound to igb_uio driver and application is running, hot-unplugging + the device may cause kernel crash. + +**Reason**: + When device is hot-unplugged, igb_uio driver will be removed which will destroy uio resources. + Later trying to access any uio resource will cause kernel crash. + +**Resolution/Workaround**: + If using DPDK for PCI HW hot-unplug, prefer to bind device with VFIO instead of IGB_UIO. + +**Affected Environment/Platform**: + ALL. + +**Driver/Module**: + ``igb_uio`` module. -- 2.7.4