[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
groovy' to 'verification-done-groovy'. If the problem still exists,
change the tag 'verification-needed-groovy' to 'verification-failed-
groovy'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-groovy
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux source package in Hirsute:
Fix Released
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test Case]
* An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
20.10 and 21.04 on LPAR, are needed.
* The system needs to be configured as KVM host with one or more KVM
guests.
* Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
This can be best forced by having only very limited CPU resources for the
hypervisor itself.
* Start monitoring the steal time, that is reported at /proc/stat,
but can be more easily verified with tools like vmstat or even top.
* If the steal time starts ever growing (exponentially), the situation
is broken.
* In case the steal time stays relatively constant,
or grows only very limited after a ramp up phase of some minutes,
or just oscillates around a certain value, a fixed/patched kernel is in use.
[Regression Potential]
* The patch only changes the single line that calculates:
account_steal_time
* In case the account_steal_time calculation is still broken after the
modification,
the steal time is just again not reported correctly on s390x,
but maybe in a different way (rather than exponentially growing).
* But it will not further harm virtualization on s390x systems.
* The modification is very limited with that one line change.
* The commit got upstream accepted with 5.12-rc4.
[Other]
* Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
hirsute, groovy and focal are affected.
* The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
__
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag 'verification-needed-focal' to 'verification-failed-focal'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-focal
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux source package in Hirsute:
Fix Released
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test Case]
* An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
20.10 and 21.04 on LPAR, are needed.
* The system needs to be configured as KVM host with one or more KVM
guests.
* Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
This can be best forced by having only very limited CPU resources for the
hypervisor itself.
* Start monitoring the steal time, that is reported at /proc/stat,
but can be more easily verified with tools like vmstat or even top.
* If the steal time starts ever growing (exponentially), the situation
is broken.
* In case the steal time stays relatively constant,
or grows only very limited after a ramp up phase of some minutes,
or just oscillates around a certain value, a fixed/patched kernel is in use.
[Regression Potential]
* The patch only changes the single line that calculates:
account_steal_time
* In case the account_steal_time calculation is still broken after the
modification,
the steal time is just again not reported correctly on s390x,
but maybe in a different way (rather than exponentially growing).
* But it will not further harm virtualization on s390x systems.
* The modification is very limited with that one line change.
* The commit got upstream accepted with 5.12-rc4.
[Other]
* Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
hirsute, groovy and focal are affected.
* The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
__
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
The commit "s390/vtime: fix increased steal time accounting" landed in hirsute
as c64e48d4ace3 in kernel Ubuntu-5.11.0-14 and this kernel is in hirsute's
release pocket:
linux-generic | 5.11.0.14.15 | hirsute | s390x
Hence closing the hirsute entry as Fix Released.
** Changed in: linux (Ubuntu Hirsute)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux source package in Hirsute:
Fix Released
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test Case]
* An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
20.10 and 21.04 on LPAR, are needed.
* The system needs to be configured as KVM host with one or more KVM
guests.
* Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
This can be best forced by having only very limited CPU resources for the
hypervisor itself.
* Start monitoring the steal time, that is reported at /proc/stat,
but can be more easily verified with tools like vmstat or even top.
* If the steal time starts ever growing (exponentially), the situation
is broken.
* In case the steal time stays relatively constant,
or grows only very limited after a ramp up phase of some minutes,
or just oscillates around a certain value, a fixed/patched kernel is in use.
[Regression Potential]
* The patch only changes the single line that calculates:
account_steal_time
* In case the account_steal_time calculation is still broken after the
modification,
the steal time is just again not reported correctly on s390x,
but maybe in a different way (rather than exponentially growing).
* But it will not further harm virtualization on s390x systems.
* The modification is very limited with that one line change.
* The commit got upstream accepted with 5.12-rc4.
[Other]
* Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
hirsute, groovy and focal are affected.
* The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
__
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1921498/+subscriptions
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
** Changed in: ubuntu-z-systems
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux source package in Hirsute:
In Progress
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test Case]
* An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
20.10 and 21.04 on LPAR, are needed.
* The system needs to be configured as KVM host with one or more KVM
guests.
* Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
This can be best forced by having only very limited CPU resources for the
hypervisor itself.
* Start monitoring the steal time, that is reported at /proc/stat,
but can be more easily verified with tools like vmstat or even top.
* If the steal time starts ever growing (exponentially), the situation
is broken.
* In case the steal time stays relatively constant,
or grows only very limited after a ramp up phase of some minutes,
or just oscillates around a certain value, a fixed/patched kernel is in use.
[Regression Potential]
* The patch only changes the single line that calculates:
account_steal_time
* In case the account_steal_time calculation is still broken after the
modification,
the steal time is just again not reported correctly on s390x,
but maybe in a different way (rather than exponentially growing).
* But it will not further harm virtualization on s390x systems.
* The modification is very limited with that one line change.
* The commit got upstream accepted with 5.12-rc4.
[Other]
* Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
hirsute, groovy and focal are affected.
* The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
__
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1921498/+subscriptions
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Groovy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Groovy:
Fix Committed
Status in linux source package in Hirsute:
In Progress
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test Case]
* An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
20.10 and 21.04 on LPAR, are needed.
* The system needs to be configured as KVM host with one or more KVM
guests.
* Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
This can be best forced by having only very limited CPU resources for the
hypervisor itself.
* Start monitoring the steal time, that is reported at /proc/stat,
but can be more easily verified with tools like vmstat or even top.
* If the steal time starts ever growing (exponentially), the situation
is broken.
* In case the steal time stays relatively constant,
or grows only very limited after a ramp up phase of some minutes,
or just oscillates around a certain value, a fixed/patched kernel is in use.
[Regression Potential]
* The patch only changes the single line that calculates:
account_steal_time
* In case the account_steal_time calculation is still broken after the
modification,
the steal time is just again not reported correctly on s390x,
but maybe in a different way (rather than exponentially growing).
* But it will not further harm virtualization on s390x systems.
* The modification is very limited with that one line change.
* The commit got upstream accepted with 5.12-rc4.
[Other]
* Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
hirsute, groovy and focal are affected.
* The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
__
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1921498/+subscriptions
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Kernel SRU request submitted for groovy and focal - and PATCH for hirsute:
https://lists.ubuntu.com/archives/kernel-team/2021-March/thread.html#118639
changing status to 'In Progress' for all entries (F, G and H).
** Description changed:
+ SRU Justification:
+ ==
+
+ [Impact]
+
+ * The reported steal time on s390x is erroneously increasing and
+ therefore broken.
+
+ * This problem got introduced with commit 152e9b8676c6e
+ ("s390/vtime: steal time exponential moving average") - upstream with v5.1
+
+ [Fix]
+
+ * d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime: fix
+ increased steal time accounting"
+
+ [Test Case]
+
+ * An IBM Z or LinuxONE systems, installed with Ubuntu Server 20.04,
+ 20.10 and 21.04 on LPAR, are needed.
+
+ * The system needs to be configured as KVM host with one or more KVM
+ guests.
+
+ * Now put significant workload on the guest(s), so that the hypervisor starts
to 'steal time'.
+ This can be best forced by having only very limited CPU resources for the
hypervisor itself.
+
+ * Start monitoring the steal time, that is reported at /proc/stat,
+ but can be more easily verified with tools like vmstat or even top.
+
+ * If the steal time starts ever growing (exponentially), the situation
+ is broken.
+
+ * In case the steal time stays relatively constant,
+ or grows only very limited after a ramp up phase of some minutes,
+ or just oscillates around a certain value, a fixed/patched kernel is in use.
+
+ [Regression Potential]
+
+ * The patch only changes the single line that calculates:
+ account_steal_time
+
+ * In case the account_steal_time calculation is still broken after the
modification,
+ the steal time is just again not reported correctly on s390x,
+ but maybe in a different way (rather than exponentially growing).
+
+ * But it will not further harm virtualization on s390x systems.
+
+ * The modification is very limited with that one line change.
+
+ * The commit got upstream accepted with 5.12-rc4.
+
+ [Other]
+
+ * Since the patch is needed for kernel higher than 5.1 and got upstream
accepted with 5.12-rc4,
+ hirsute, groovy and focal are affected.
+
+ * The upstream commit can be cleanly cherry-picked from all three affected
Ubuntu releases.
+ __
+
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
-moving average") inadvertently changed the input value for
-account_steal_time() from "cputime_to_nsecs(steal)" to just
-"steal", resulting in broken increased steal time accounting.
+ moving average") inadvertently changed the input value for
+ account_steal_time() from "cputime_to_nsecs(steal)" to just
+ "steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
-
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: linux (Ubuntu Groovy)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: linux (Ubuntu Hirsute)
Assignee: Frank Heimes (fheimes) => Canonical Kernel Team
(canonical-kernel-team)
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => High
** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => High
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => High
** Changed in: linux (Ubuntu Hirsute)
Status: New => In Progress
** Changed in: linux (Ubuntu Groovy)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
In Progress
Status in linux source package in Groovy:
In Progress
Status in linux source package in Hirsute:
In Progress
Bug description:
SRU Justification:
==
[Impact]
* The reported steal time on s390x is erroneously increasing and
therefore broken.
* This problem got introduced with commit 152e9b8676c6e
("s390/vtime: steal time exponential moving average") - upstream with v5.1
[Fix]
* d54cb7d54877d529bc1e0e1f47a3dd082f73add3 d54cb7d54877 "s390/vtime:
fix increased steal time accounting"
[Test
[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Test builds for hirsute, groovy and focal:
https://launchpad.net/~fheimes/+archive/ubuntu/lp1921498/+packages
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https://bugs.launchpad.net/bugs/1921498
Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
Status in linux source package in Focal:
New
Status in linux source package in Groovy:
New
Status in linux source package in Hirsute:
New
Bug description:
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1921498/+subscriptions
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[Kernel-packages] [Bug 1921498] Re: [UBUNUT 21.04] s390/vtime: fix increased steal time accounting
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: linux (Ubuntu Hirsute)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Frank Heimes
(fheimes)
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Title:
[UBUNUT 21.04] s390/vtime: fix increased steal time accounting
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
Status in linux source package in Focal:
New
Status in linux source package in Groovy:
New
Status in linux source package in Hirsute:
New
Bug description:
Description: s390/vtime: fix increased steal time accounting
Symptom: Increased steal time values.
Problem: Commit 152e9b8676c6e ("s390/vtime: steal time exponential
moving average") inadvertently changed the input value for
account_steal_time() from "cputime_to_nsecs(steal)" to just
"steal", resulting in broken increased steal time accounting.
Solution: Fix this by changing it back to "cputime_to_nsecs(steal)".
Reproduction: -
Upstream-ID: d54cb7d54877d529bc1e0e1f47a3dd082f73add3
Stable tagged : kernel 5.1.
Therefore only to be applyable for focal, groovy, hirsuite.
Due to stable tag integration , only for integration checking..
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