** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1793464
Title:
Kernel panic after the ubuntu_nbd_smoke_test on Xenial kernel
Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Fix Committed
Bug description:
== SRU Justification ==
When running the Ubuntu nbd autotest regression test we trip a hang
and then a little later a panic message. There are two upstream
fixes required as this is actually two issues in one. One fix is to
not to shutdown the sock when IRQs are disable and a second to fix is
to race in the nbd ioctl.
== Fix ==
Upstream commits:
23272a6754b81ff6503e09c743bb4ceeeab39997
nbd: Remove signal usage
1f7b5cf1be4351e60cf8ae7aab976503dd73c5f8
nbd: Timeouts are not user requested disconnects
0e4f0f6f63d3416a9e529d99febfe98545427b81
nbd: Cleanup reset of nbd and bdev after a disconnect
c261189862c6f65117eb3b1748622a08ef49c262
nbd: don't shutdown sock with irq's disabled
97240963eb308d8d21a89c0459822f7ea98463b4
nbd: fix race in ioctl
The first 3 patches are prerequisites required for the latter two fixes to
apply and work correctly. Most of these backports are minor patch wiggles
required because later patches have been applied to the driver in earlier
fixes to this driver.
== Regression Potential ==
These fixes just touch nbd, so the regression potential is just
limited to this. Secondly, we are pulling in upstream fixes that exist
in Bionic and Cosmic kernels, so these are tried and tested fixes.
== Test Case ==
1. Deploy a node with 4.4 Xenial
2. Run the ubuntu_nbd_smoke_test
Without the fix, we get hang/crashes. With the fix one can run this test
multiple times without any issues at all.
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This issue can be reproduced on AMD64 KVM //bare-metal node, s390x
zKVM node
The test itself will pass, but the system will hang after a few
second.
Steps:
1. Deploy a node with 4.4 Xenial
2. Run the ubuntu_nbd_smoke_test
If you have access to the console, you will see that this system
actually bumped into a kernel panic:
Unable to handle kernel pointer dereference in virtual kernel address space
failing address: 000003ff802c1000 TEID: 000003ff802c1803
Fault in home space mode while using kernel ASCE.
Log here (s390x KVM): https://pastebin.ubuntu.com/p/dNmtvbGjmz/
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-136-generic 4.4.0-136.162
ProcVersionSignature: Ubuntu 4.4.0-136.162-generic 4.4.144
Uname: Linux 4.4.0-136-generic s390x
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code
2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
Date: Thu Sep 20 03:46:00 2018
HibernationDevice: RESUME=UUID=ca468a9c-9563-442c-85c6-6055e800a66e
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=b65b756a-ba4e-4c53-aa32-0db2bdb50bb3
crashkernel=196M
RelatedPackageVersions:
linux-restricted-modules-4.4.0-136-generic N/A
linux-backports-modules-4.4.0-136-generic N/A
linux-firmware 1.157.20
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
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