This bug was fixed in the package linux - 4.10.0-37.41
---------------
linux (4.10.0-37.41) zesty; urgency=low
* CVE-2017-1000255
- SAUCE: powerpc/64s: Use emergency stack for kernel TM Bad Thing program
checks
- SAUCE: powerpc/tm: Fix illegal TM state in signal handler
linux (4.10.0-36.40) zesty; urgency=low
* linux: 4.10.0-36.40 -proposed tracker (LP: #1718143)
* Neighbour confirmation broken, breaks ARP cache aging (LP: #1715812)
- sock: add sk_dst_pending_confirm flag
- net: add dst_pending_confirm flag to skbuff
- sctp: add dst_pending_confirm flag
- tcp: replace dst_confirm with sk_dst_confirm
- net: add confirm_neigh method to dst_ops
- net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP
- net: pending_confirm is not used anymore
* SRIOV: warning if unload VFs (LP: #1715073)
- PCI: Lock each enable/disable num_vfs operation in sysfs
- PCI: Disable VF decoding before pcibios_sriov_disable() updates resources
* Kernel has troule recognizing Corsair Strafe RGB keyboard (LP: #1678477)
- usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard
* CVE-2017-14106
- tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0
* [CIFS] Fix maximum SMB2 header size (LP: #1713884)
- CIFS: Fix maximum SMB2 header size
* Middle button of trackpoint doesn't work (LP: #1715271)
- Input: trackpoint - assume 3 buttons when buttons detection fails
* Drop GPL from of_node_to_nid() export to match other arches (LP: #1709179)
- powerpc: Drop GPL from of_node_to_nid() export to match other arches
* vhost guest network randomly drops under stress (kvm) (LP: #1711251)
- Revert "vhost: cache used event for better performance"
* arm64 arch_timer fixes (LP: #1713821)
- Revert "UBUNTU: SAUCE: arm64: arch_timer: Enable CNTVCT_EL0 trap if
workaround is enabled"
- arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled
- clocksource/arm_arch_timer: Fix arch_timer_mem_find_best_frame()
- clocksource/drivers/arm_arch_timer: Fix read and iounmap of incorrect
variable
- clocksource/drivers/arm_arch_timer: Fix mem frame loop initialization
- clocksource/drivers/arm_arch_timer: Avoid infinite recursion when ftrace
is
enabled
* Touchpad not detected (LP: #1708852)
- Input: elan_i2c - add ELAN0608 to the ACPI table
-- Thadeu Lima de Souza Cascardo <casca...@canonical.com> Fri, 06 Oct
2017 16:45:48 -0300
** Changed in: linux (Ubuntu Zesty)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000255
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-14106
--
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https://bugs.launchpad.net/bugs/1711251
Title:
vhost guest network randomly drops under stress (kvm)
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Zesty:
Fix Released
Bug description:
== SRU Justification ==
A vhost performance patch was introduced in the 4.10 kernel upstream,
and is currently included in the Zesty 4.10 kernel:
commit 809ecb9bca6a9424ccd392d67e368160f8b76c92
Author: Jason Wang <jasow...@redhat.com>
Date: Mon Dec 12 14:46:49 2016 +0800
vhost: cache used event for better performance
--
However I recently hit a functional issue linked to this patch which
would cause random guests to lose their network connection under
stress. This is not architecture specific and more likely to be hit
with high network stress (i.e. lots of uperf instances).
The patch author has now reverted this patch upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/vhost?id=8d65843c44269c21e95c98090d9bb4848d473853
which reads:
"
Revert "vhost: cache used event for better performance"
This reverts commit 809ecb9bca6a9424ccd392d67e368160f8b76c92. Since it
was reported to break vhost_net. We want to cache used event and use
it to check for notification. The assumption was that guest won't move
the event idx back, but this could happen in fact when 16 bit index
wraps around after 64K entries.
Signed-off-by: Jason Wang <jasow...@redhat.com>
Acked-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
"
I am requesting this patch to revert the problematic one be pulled
into Ubuntu Zesty (anything 4.10+).
---uname output---
Linux p82qvirt 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:19
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8247-22L
---Steps to Reproduce---
I can recreate the scenario with the following setup:
- on a 20core host, start 20 1core VMs
- I have a single linux bridge assigned to all guests using virtio
- start a uperf benchmark between each guest pair (10 total) using a high
number of uperf nprocs (32)
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