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From: Jeff Guo <jia.guo@intel.com>
To: marko.kovacevic@intel.com, john.mcnamara@intel.com,
	qi.z.zhang@intel.com, ferruh.yigit@intel.com,
	thomas@monjalon.net
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
Subject: [dpdk-dev] [PATCH] doc: add known igb_uio device hot-unplug issue
Date: Tue, 20 Nov 2018 23:09:31 +0800	[thread overview]
Message-ID: <1542726571-121934-1-git-send-email-jia.guo@intel.com> (raw)

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 <jia.guo@intel.com>
---
 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

             reply	other threads:[~2018-11-20 15:06 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-20 15:09 Jeff Guo [this message]
2018-11-20 18:02 ` Stephen Hemminger
2018-11-21  7:42   ` Jeff Guo
2018-11-22 17:46 ` Ferruh Yigit
2018-11-22 17:57 ` Mcnamara, John
2018-11-23  2:12   ` Thomas Monjalon

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