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Message #163832
[Bug 1505564] Re: Soft lockup with "block nbdX: Attempted send on closed socket" spam
verification can be done with this script:
#!/bin/bash
modprobe nbd
qemu-nbd -d /dev/nbd0
truncate /tmp/testfile -s 20G
qemu-nbd -c /dev/nbd0 /tmp/testfile
for n in $( seq 1 250 ) ; do
echo $n
( dd if=/dev/zero of=/dev/nbd0 bs=1 & )
done
qemu-nbd -d /dev/nbd0
after running that, on an unpatched system the dmesg will show a large number (~100 or more) of messages like:
[ 70.408246] block nbd0: Attempted send on closed socket
with a patched kernel, the dmesg will show a ratelimited number (~10) of
those messages.
This has been verified on trusty 3.13, vivid 3.19, and wily 4.2
** Tags removed: verification-needed-vivid verification-needed-wily
** Tags added: verification-done-vivid verification-done-wily
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https://bugs.launchpad.net/bugs/1505564
Title:
Soft lockup with "block nbdX: Attempted send on closed socket" spam
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Vivid:
Fix Committed
Status in linux source package in Wily:
Fix Committed
Bug description:
Some of our nova compute hosts regularly freeze, sometimes for a few
hours, with kern.log getting spammed with:
block nbdX: Attempted send on closed socket
and a few "CPU soft lockup" messages (see attached log). This clears
up when the queue gets cleared, eg :
block nbdX: queue cleared
trusty hosts with kernel version 3.19.0-30-generic.
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Nov 24 12:23 seq
crw-rw---- 1 root audio 116, 33 Nov 24 12:23 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 14.04
IwConfig: Error: [Errno 2] No such file or directory
MachineType: HP ProLiant DL385 G7
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-36-generic root=UUID=13289ac9-8dc9-4feb-b6bd-ca7db66b21d6 ro console=tty0 console=ttyS1,38400 nosplash crashkernel=384M-:512M nox2apic intremap=off
ProcVersionSignature: Ubuntu 3.19.0-36.41~14.04.1hf00090138v20151122b1-generic 3.19.8-ckt9
RelatedPackageVersions:
linux-restricted-modules-3.19.0-36-generic N/A
linux-backports-modules-3.19.0-36-generic N/A
linux-firmware 1.127.18
RfKill: Error: [Errno 2] No such file or directory
Tags: trusty uec-images
Uname: Linux 3.19.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
dmi.bios.date: 02/02/2014
dmi.bios.vendor: HP
dmi.bios.version: A18
dmi.chassis.type: 23
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrA18:bd02/02/2014:svnHP:pnProLiantDL385G7:pvr:cvnHP:ct23:cvr:
dmi.product.name: ProLiant DL385 G7
dmi.sys.vendor: HP
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References