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and do what?

reassign to our ppc64le qemu expert

I think we just need to use the new vnc completion timeout feature from QEMU to work around that. Same issue as aarch64.

I knew the coolo-okurz back and forth would serve a purpose ;-)

What you mentioned sounds interesting. Can you go into a little bit more detail or provide a reference?

okurz wrote:

I knew the coolo-okurz back and forth would serve a purpose ;-)

What you mentioned sounds interesting. Can you go into a little bit more detail or provide a reference?

Sure, I'm referring to this patch:

https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg03811.html

which was written exactly to fix this issue. The patch is also available in the Virtualization/qemu package:

https://build.opensuse.org/package/view_file/Virtualization/qemu/0060-vnc-add-configurable-keyboard-delay.patch?expand=1

as well as SLE12 SP2:

https://build.suse.de/package/view_file/SUSE:SLE-12-SP2:GA/qemu/0065-vnc-add-configurable-keyboard-delay.patch?expand=1

So all you need to do is make sure you're running a very recent QEMU version and pass -vnc ...,key-delay-ms=200 as parameter to the qemu command line.

created PR for that: https://github.com/os-autoinst/os-autoinst/pull/568
but since lack of backend knowledge, I'll need some help with that

okurz suggested to put in a check for the qemu version

I'm currently out of office and your email has been received. I'll be back August 31st. For issues related
SUSE OpenStack Cloud that need attention before that, please reach out to Roman Arcea rarcea@suse.com.

Thanks,
Dirk

I may be missing something here, but - we already have quite a bit of rate limiting code in os-autoinst , including an arg you can pass to type_string to control the speed of typing. In SUSE's distri code you have type_slowly and type_very_slowly functions that limit the rate beyond the default by using this arg, for instance. Do we really move in the right direction by turning on some all-or-nothing rate limiting in qemu?

If it's really the case that a given arch can't keep up with the same rate of typing in 'ideal conditions' - i.e. at a console with the minimum amount of other activity going on in the SUT and its host - then couldn't we just adjust the default rate limiting in type_string etc. to be different per arch?

And is that really the problem in this case at all? What I think I see on Fedora is that typing issues seem to be related to system load. For instance, we almost never get any errors when typing at a console on an otherwise-idle VM...but very occasionally we do get some characters swallowed, and if you happen to catch it live or get a fortunate video (the speedup on the videos can make them useless for analyzing this) and analyze it frame-by-frame, it looks like the VM mostly keeps up just fine with the typing, then suddenly for a second or two absolutely no keypresses show up, then a bunch of them appear at once; basically, it looks like something somewhere (the SUT, the worker host, or some other damn part of the chain) gets really busy and stops forwarding keypresses, then when it stops being busy, all the backlogged key presses arrive in a lump - only if more presses backed up than the SUT (I think that's where the buffer is) has buffer space for, you lose some of them.

Rate limiting could mitigate that, but universal rate limiting of all typing ever is a very large hammer for cracking that nut, and not even really foolproof, if the 'not forwarding keypresses' period lasts long enough.

Yes, I think you are right. Basically as also discussed in IRC some times and also in another progress issue, e.g. see #13702: If this issue appears it is not really a problem in qemu but just the symptom that the SUT gets stalled. A human user with better OCR is waiting for the expected even. We mainly have the problem described here when we are typing long sequences without waiting for proper feedback of the system. IMHO there should be some waiting when typing long sequences but I am not sure what kind. Would would you say regarding #13702? I'd say as in #13702#note-3 a forced wait_still_screen(1) after 30 characters by default in type_string which can be overridden on demand is a good approach. WDYT?

Would it help if you had a separate qemu keyboard input command (over vnc?) that only returns if the key was successfully pulled from the fifo queue?

Alex

Am 19.09.2016 um 23:22 schrieb redmine@opensuse.org redmine@opensuse.org:

[openSUSE Tracker]
Issue #12250 has been updated by okurz.

Yes, I think you are right. Basically as also discussed in IRC some times and also in another progress issue, e.g. see #13702: If this issue appears it is not really a problem in qemu but just the symptom that the SUT gets stalled. A human user with better OCR is waiting for the expected even. We mainly have the problem described here when we are typing long sequences without waiting for proper feedback of the system. IMHO there should be some waiting when typing long sequences but I am not sure what kind. Would would you say regarding #13702? I'd say as in #13702#note-3 a forced wait_still_screen(1) after 30 characters by default in type_string which can be overridden on demand is a good approach. WDYT?

---

action #12250: "QEMU: usb-kbd: warning: key event queue full" on ppc64le
https://progress.opensuse.org/issues/12250#change-28946

• Author: okurz
• Status: New
• Priority: Normal
• Assignee:
• Category: Bugs in existing tests

* Target version: ¶

observation¶

missing character "-f" after the test in https://openqa.suse.de/tests/412084/modules/snapper_undochange/steps/21, message in logfile: "QEMU: usb-kbd: warning: key event queue full"

problem¶

typing too fast for this backend?

suggestion¶

Probably we should detect this QEMU message and handle it explicitly.

further details¶

Related issue: https://progress.opensuse.org/issues/12018

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Would it help if you had a separate qemu keyboard input command (over vnc?)
that only returns if the key was successfully pulled from the fifo queue?

sounds like a great idea. I don't if we the then still have problems with
other backends but the qemu machines are more prone to mutual stalling so I
might very well help.

What is the status here? Can szarate do the fix suggested from agraf?

QEMU: usb-kbd: warning: key event queue full
QEMU: main-loop: WARNING: I/O thread spun for 1000 iterations

Job: https://openqa.suse.de/tests/666816#step/zypper_lifecycle/15

yes, it seems that openQA server is overloaded.

To add a bit more on what @zluo wrote on #15118, there are stalls in this job that are up to 38 seconds, which basically means that the system was really slow at that point.

However, what mkravec is describing seems to be more related to: This bug... It seems that there are few solutions to this like this one.

another example of failure https://openqa.suse.de/tests/668028

https://openqa.suse.de/tests/679773#step/zypper_lr/11
https://openqa.suse.de/tests/679775#step/zypper_lifecycle/35

Another example:
https://openqa.suse.de/tests/704536#step/hostname_inst/3

@coolo, i think it would be wise to add some kind of monitoring now at least to capture the CPU usage... i'll play with a machine in orthos to see if i can catch it... but so far looks like we can say that this would be a known failure (And therefore a job to restart automatically by the webui)

There are failures in every build (5 tests failed in build 0202)
Build0211: https://openqa.suse.de/tests/721648

szarate wrote:

I came across this interesting one: https://openqa.suse.de/tests/733459#step/updates_packagekit_gpk/7 The message "QEMU: usb-kbd: warning: key event queue full" is not shown, but still the c from clear was already missing.

This might be unrelated but leaving this here for future reference.

Also, changing the status to feedback as it has been fixed but waiting for deploy of os-autoinst on workers for final verification.

This is also another similar occurence of this bug: http://e13.suse.de/tests/1705#step/yast2_apparmor/10 previous screen sends a alt-n but there's no messages again by the QEMU backend...

should be related: https://openqa.suse.de/tests/748289#

https://progress.opensuse.org/issues/12250

you know that overdrive2 is not under control of salt and therefore fall in the domain of "but it is fixed in os-autoinst@master!!!1eins"

ppc64le: https://openqa.suse.de/tests/754640
it died immediately after the "queue full" was detected but the job is regarded as "incomplete" and the error is not obvious without diving into the logfile. So some time saved by not fooling ourselves. for "incomplete" it is pretty obvious we need to look into the logfile anyway but it would be better if we can call something like a "record_known_failure" and forward that to the webui.

https://openqa.suse.de/tests/828004

The issue always reproduced on power for recent builds
https://openqa.suse.de/tests/829192
https://openqa.suse.de/tests/829193

https://openqa.suse.de/tests/829238

So when typing with 50kps we can reproduce this problem like 100% in console tests. 15 was okayish, so I guess ppc (and possibly aarch64) would need some even lower.

As also ikvm and other platforms are affected (I had to lower the typing speed for idrac interfaces to 10kps), I guess we need to have this setting globally in the machine definition.

ppc64le failed

This is the bugzilla to track "keyboard type queue is empty" events which OpenQA could then use to only press keys when they were successfully handled by the guest:

https://bugzilla.suse.com/show_bug.cgi?id=1031692

It also happens here https://openqa.suse.de/tests/855925

another one:
https://openqa.suse.de/tests/858593

Other occurrences for Leap 42.3 and ppc64le (1)
systematically when "curl_https" script has loop of validate_script_output. (2)
Do we need a specific new issue for this problem ?

(1) https://openqa.opensuse.org/tests/overview?distri=opensuse&version=42.3&build=0037&groupid=30
(2) https://openqa.opensuse.org/tests/381080/modules/curl_https/steps/1/src

And another exemple (1) for sshd.pm
where the issued string is 86 characters long (2)

(1) https://openqa.opensuse.org/tests/382112/file/autoinst-log.txt
(2) 'ssh -v sshboy@localhost -t echo LOGIN_SUCCESSFUL; echo SSH-1491407073-$?- > /dev/hvc0'

Here is another example: https://openqa.suse.de/tests/861360

ppc64le migration test failed on QEMU: usb-kbd: warning: key event queue full
https://openqa.suse.de/tests/918599
https://openqa.suse.de/tests/918604

Here are some more recent examples on ppc64le:
https://openqa.suse.de/tests/931322 (Tried to type 134 chars before fail)
https://openqa.suse.de/tests/930630 (107 chars)
https://openqa.suse.de/tests/931356 (86 chars)
https://openqa.suse.de/tests/931937
https://openqa.suse.de/tests/930663

Also the log of this: https://openqa.suse.de/tests/931322/file/autoinst-log.txt
Shows another interesting error:

22:01:27.9912 88247 capture loop failed QEMU: Shutting down the job at /usr/lib/os-autoinst/backend/qemu.pm line 955.

but this is maybe just caused by the full event queue.

slesp2 image creating (for migration) failed on aarch64_maintenance worker
https://openqa.suse.de/tests/940559

Re-triggered several times and always failed at the same step with key event queue full issue:
https://openqa.suse.de/tests/982202

Any idea to avoid it to publish a SP2 aarch64 image, then I can try migration from that.

My advice would be to apply the same fix to the tests that I suggested in #19540

I would recommend changing grub_set_bootargs.pm line 20 to use wait_screen_changes=1 to naturally type more slowly and therefore avoid filling up the key event queue.

Recent example:

sle-12-SP3-Server-DVD-ppc64le-Build0424-RAID0@ppc64le
osd#995630#downloads

Recent example: qam-minimal-full@aarch64_maintenance just died because of this:

QEMU: usb-kbd: warning: key event queue full

Log: https://openqa.suse.de/tests/1035782/file/autoinst-log.txt
https://openqa.suse.de/tests/1035782#

pgeorgiadis wrote:

Recent example: qam-minimal-full@aarch64_maintenance just died because of this:

QEMU: usb-kbd: warning: key event queue full

Log: https://openqa.suse.de/tests/1035782/file/autoinst-log.txt
https://openqa.suse.de/tests/1035782#

Is this using the latest SP3 QEMU yet?

algraf wrote:

Is this using the latest SP3 QEMU yet?

Oh I just saw this is maintenance, so it's running on the old SP2 OpenQA system?

yes, the host is overdrive2.