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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1467912
Title:
error "ib_dealloc_pd failed" when load unload ib_ipoib module
Status in linux package in Ubuntu:
Incomplete
Bug description:
When we try to load and unload the ib_ipoib driver we get an error
message.
Steps to reproduce:
load ib_ipoib: modprobe -v ib_ipoib
configure ip: ifconfig ib0 11.135.196.7/16
unload driver: modprobe -rv ib_ipoib
We will see this message in dmesg:
[ 709.652944] ib0: ib_dealloc_pd failed
uname output:
root@qa-h-vrt-035:~# uname -a
Linux qa-h-vrt-035 3.19.0-16-generic #16-Ubuntu SMP Thu Apr 30 16:09:58 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
The following two upstream commits fix this issue:
commit 9ab874b6593045886b699df2bc3ff803d88a9f7c
Author: Doug Ledford <dledf...@redhat.com>
Date: Sat Feb 21 19:27:00 2015 -0500
IB/ipoib: change init sequence ordering
In preparation for using per device work queues, we need to move the
start of the neighbor thread task to after ipoib_ib_dev_init and move
the destruction of the neighbor task to before ipoib_ib_dev_cleanup.
Otherwise we will end up freeing our workqueue with work possibly
still on it.
Signed-off-by: Doug Ledford <dledf...@redhat.com>
commit 6387d8d5896536b904ba6937fe019a29548e3a86
Author: Doug Ledford <dledf...@redhat.com>
Date: Sat Feb 21 19:26:59 2015 -0500
IB/ipoib: factor out ah flushing
Create a an ipoib_flush_ah and ipoib_stop_ah routines to use at
appropriate times to flush out all remaining ah entries before we shut
the device down.
Because neighbors and mcast entries can each have a reference on any
given ah, we must make sure to free all of those first before our ah
will actually have a 0 refcount and be able to be reaped.
This factoring is needed in preparation for having per-device work
queues. The original per-device workqueue code resulted in the following
error message:
<ibdev>: ib_dealloc_pd failed
That error was tracked down to this issue. With the changes to which
workqueues were flushed when, there were no flushes of the per device
workqueue after the last ah's were freed, resulting in an attempt to
dealloc the pd with outstanding resources still allocated. This code
puts the explicit flushes in the needed places to avoid that problem.
Signed-off-by: Doug Ledford <dledf...@redhat.com>
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