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[Bug 1531768] Re: [arm64] lockups when idle if tickless (nohz=on) is used
I'd like to factor out if we are missing IRQs on the host and inside the
VM, so can both be booted with kernel parameter: irqpoll
unfortunately this can eat more cpu cycles, so I'm reluctant to ask for
this to be used, but I'm wondering of the host or VM are occasionally
missing timer wakeups
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[arm64] lockups when idle if tickless (nohz=on) is used
Status in Auto Package Testing:
Status in linux package in Ubuntu:
I created an 8 CPU arm64 instance on Canonical's Scalingstack (which I
want to use for armhf autopkgtesting in LXD). I started with wily as
that has lxd available (it's not yet available in trusty nor the PPA
However, pretty much any LXD task that I do (I haven't tried much
else) on this machine takes unbearably long. A simple "lxc profile set
default raw.lxc lxc.seccomp=" or "lxc list" takes several minutes.
I see tons of
[ 1020.971955] rcu_sched kthread starved for 6000 jiffies! g1095 c1094 f0x0
[ 1121.166926] INFO: task fsnotify_mark:69 blocked for more than 120 seconds.
in dmesg (the attached apport info has the complete dmesg).
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-22-generic 4.2.0-22.27
ProcVersionSignature: User Name 4.2.0-22.27-generic 4.2.6
Uname: Linux 4.2.0-22-generic aarch64
crw-rw---- 1 root audio 116, 1 Jan 7 09:18 seq
crw-rw---- 1 root audio 116, 33 Jan 7 09:18 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Thu Jan 7 09:24:01 2016
eth0 no wireless extensions.
lo no wireless extensions.
lxcbr0 no wireless extensions.
00:00.0 Host bridge : Red Hat, Inc. Device [1b36:0008]
Subsystem: Red Hat, Inc Device [1af4:1100]
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=LABEL=cloudimg-rootfs earlyprintk
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
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