[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: ubuntu-z-systems Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
This bug was fixed in the package qemu - 1:2.5+dfsg-5ubuntu10.47 --- qemu (1:2.5+dfsg-5ubuntu10.47) xenial; urgency=medium * d/p/u/lp-1894942-*: fix virtio-ccw host/guest notification (LP: #1894942) -- Christian Ehrhardt Mon, 21 Sep 2020 15:50:56 +0200 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
This bug was fixed in the package qemu - 1:2.11+dfsg-1ubuntu7.33 --- qemu (1:2.11+dfsg-1ubuntu7.33) bionic; urgency=medium * d/p/u/lp-1894942-*: fix virtio-ccw host/guest notification (LP: #1894942) -- Christian Ehrhardt Mon, 21 Sep 2020 15:39:32 +0200 ** Changed in: qemu (Ubuntu Bionic) Status: Fix Committed => Fix Released ** Changed in: qemu (Ubuntu Xenial) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks! Updated verification tags. ** Tags removed: verification-needed verification-needed-xenial ** Tags added: verification-done verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
I know that testing the same on multiple series can be cumbersome, but it is part of and required by the SRU process. So again many thx (I've updated the tag accordingly ...) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks Halil for testing bionic (I've updated the tag accordingly), and also thanks for having a look at xenial ... ** Tags removed: verification-needed-bionic ** Tags added: verification-done-bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
This bug was fixed in the package qemu - 1:4.2-3ubuntu6.8 --- qemu (1:4.2-3ubuntu6.8) focal; urgency=medium * d/p/u/lp-1894942-*: fix virtio-ccw host/guest notification (LP: #1894942) -- Christian Ehrhardt Mon, 21 Sep 2020 15:35:30 +0200 ** Changed in: qemu (Ubuntu Focal) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Tags removed: verification-needed-focal ** Tags added: verification-done-focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks, could you please also test Xenial and Bionic? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
I found no regressions running this on some general workloads which is good, but as mentioned in the SRU I can't reproduce the issue on our s390x box. Therefore it is up to IBM (the reporter) to verify the builds in -proposed in regard to the actual bug fix. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: ubuntu-z-systems Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Hello bugproxy, or anyone else affected, Accepted qemu into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.8 in a few hours, and then in the -proposed repository. Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed- focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification- failed-focal. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: qemu (Ubuntu Focal) Status: In Progress => Fix Committed ** Tags added: verification-needed verification-needed-focal ** Changed in: qemu (Ubuntu Bionic) Status: In Progress => Fix Committed ** Tags added: verification-needed-bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
FYI: Review is complete and this was uploaded to the X/B/F-unapproved queue entering the SRU process. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: ubuntu-z-systems Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: qemu (Ubuntu Xenial) Status: Triaged => In Progress ** Changed in: qemu (Ubuntu Bionic) Status: Triaged => In Progress ** Changed in: qemu (Ubuntu Focal) Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Added an SRU Template to the bug description and opened MPs for the related packaging changes: - https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392163 - https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392164 - https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392165 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Merge proposal linked: https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392163 ** Merge proposal linked: https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392164 ** Merge proposal linked: https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/392165 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Description changed:
+ [Impact]
+
+ * Host -> Guest notifications can be lost and kill I/O due to that,
+see below at the original bug report for more details.
+
+ * Backport the fix that ensures that the generated code has to re-load
+variables properly avoiding the issue.
+
+ [Test Case]
+
+ * Set up iperf in the host and run the server "iperf -s"
+ * get a guest using driver=qemu like:
+
+
+
+
+
+ * In the guest run a loop of iperf runs connecting to the
+server on the host.
+ #!/bin/bash
+ for i in $(seq 1 1000);
+ do
+ echo Try $i
+ iperf -c 192.168.122.1 || break
+ done
+ * Depending on the HW model, the machine saturation and such it seems
+the above test either is rather reproducible or not-at-all.
+That is bad, but we haven't found a much better repro, gladly IBM
+who reported this issue (and created the fix) can recreate this on
+their end and are willing to do so again for the SRU verification.
+
+ [Regression Potential]
+
+ * The changed code path is s390x only and there on the virtio-ccw
+handling. Therefore regressions - if any - would be isolated to s390x
+only and there manifest on virtio-ccw based I/O.
+
+ [Other Info]
+
+ * n/a
+
+
+
+
Problem Description:
When irqfds are not used setting of the adapter interruption
host-->guest notifier bit is accomplished by the QEMU function
virtio_set_ind_atomic().
- The atomic_cmpxchg() loop in virtio_set_ind_atomic() is broken because we
occasionally end up with old and _old having different values (a legit compiler
can generate code that accessed *ind_addr again to pick up a value for _old
instead of using the value of old that was already fetched according to the
rules of the abstract machine). This means the underlying CS instruction may
use a different old (_old) than the one we intended to use if atomic_cmpxchg()
performed the xchg part.
-
- The direct consequence of the problem is that host --> guest notifications
can get lost. The indirect consequence is that queues may get stuck and the
devices may cease operate normally. We stumbled on debugging a choked
virtio-net interface (one that used the qemu driver and not vhost). But it can
affect other virtio-ccw devices as well.
+ The atomic_cmpxchg() loop in virtio_set_ind_atomic() is broken because
+ we occasionally end up with old and _old having different values (a
+ legit compiler can generate code that accessed *ind_addr again to pick
+ up a value for _old instead of using the value of old that was already
+ fetched according to the rules of the abstract machine). This means the
+ underlying CS instruction may use a different old (_old) than the one we
+ intended to use if atomic_cmpxchg() performed the xchg part.
+
+ The direct consequence of the problem is that host --> guest
+ notifications can get lost. The indirect consequence is that queues may
+ get stuck and the devices may cease operate normally. We stumbled on
+ debugging a choked virtio-net interface (one that used the qemu driver
+ and not vhost). But it can affect other virtio-ccw devices as well.
If irqfds are used for host->guest notifications, then we are safe
because notifier bit manipulation is done in the kernel (and it's done
correctly).
-
The problem described above is fixed upstream by commit.
1a8242f7c3 ("virtio-ccw: fix virtio_set_ind_atomic")
All upstream versions since v2.0.0 are (potentially) affected.
The same mistake was made in QEMU in another place, and is fixed by:
45175361f1 ("s390x/pci: fix set_ind_atomic")
We can file a separate BZ for it if necessary.
--
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https://bugs.launchpad.net/bugs/1894942
Title:
[UBUNTU 20.04] Lost virtio host --> guest notifications cause devices
to cease normal operation
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[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks Halil! I was not able to trigger this on our machine in a thousand runs on bionic and focal, but it might be machine/model and/or overall machine business dependent. Therefore I'm extra-glad you gave this a try on your end as well! Due to that I'll also have to rely on you for the actual final verification in -proposed then. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: qemu (Ubuntu Bionic) Status: Incomplete => Triaged ** Changed in: qemu (Ubuntu Xenial) Status: Incomplete => Triaged ** Changed in: qemu (Ubuntu Xenial) Importance: Undecided => Low ** Changed in: qemu (Ubuntu Bionic) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Checking SRU compatibility: #1 Source Focal: some (minor) backport noise Bionic: the same backport of Focal applies with offsets. Xenial: some more nois (tracepoint missing), but still ok Not as-is, but pretty close - should be ok #2 Builds I have started builds of those in https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4270 #3 testing The builds in the PPA succeeded now. I'd ask IBM to verify with their tests to check if they can a) trigger the issue on those releases and b) if the PPA then is fixing for them as expected. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Also affects: qemu (Ubuntu Groovy) Importance: High Assignee: Canonical Server Team (canonical-server) Status: Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
This bug was fixed in the package qemu - 1:5.0-5ubuntu8 --- qemu (1:5.0-5ubuntu8) groovy; urgency=medium * d/p/u/lp-1887930-*: Enable Channel Path Handling for vfio-ccw (LP: #1887930) qemu (1:5.0-5ubuntu7) groovy; urgency=medium * d/p/u/lp-1894942-*: fix virtio-ccw host/guest notification (LP: #1894942) -- Christian Ehrhardt Mon, 14 Sep 2020 08:23:49 +0200 ** Changed in: qemu (Ubuntu) Status: In Progress => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks Halil, I have uploaded it to Groovy already. For SRU considerations let us wait what the outcome of 1887930 will be - since if approved - they'd make a good pair for an SRU upload. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Thanks for the quick answer! Any particular uperf profile that was found to be more likely/reliably to trigger it? I assume with driver=qemu you actually mean something like: https://libvirt.org/formatdomain.html#network-interfaces -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Merge proposal linked: https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/390440 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
At least for Groovy that seems pretty trivial. PPA: https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4257/+packages MP: https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/390440 For consideration on SRUs for other releases please answer the questions of comment #2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Changed in: ubuntu-z-systems Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
Hi, the patches LGTM and I'll make it part of the Ubuntu builds. One question thou: on one hand "occasionally end up with" sounds like this is almost impossible to explicitly test, but then the attached debug patch suggests there might be a way to trigger this through protvirt. But even if that is the case backporting it to all kind of older versions there is no protvirt. So I wanted to ask: a) is there any way to reliably trigger this for A/B testing of the fix as far back as qemu 2.5? b) how real is the danger to hit and consequences of this in the pre-protvirt (= Incomplete ** Changed in: qemu (Ubuntu Bionic) Status: New => Incomplete ** Changed in: qemu (Ubuntu Focal) Status: New => Triaged ** Changed in: qemu (Ubuntu Focal) Importance: Undecided => Medium ** Changed in: qemu (Ubuntu) Importance: Undecided => High ** Changed in: qemu (Ubuntu) Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1894942] Re: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation
** Also affects: ubuntu-z-systems Importance: Undecided Status: New ** Changed in: ubuntu-z-systems Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team) ** Changed in: qemu (Ubuntu) Assignee: Skipper Bug Screeners (skipper-screen-team) => Canonical Server Team (canonical-server) ** Changed in: ubuntu-z-systems Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1894942 Title: [UBUNTU 20.04] Lost virtio host --> guest notifications cause devices to cease normal operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1894942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
