[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Updating to Fix Released, because LP#1981864 was updated to Fix
Released.
** Changed in: linux (Ubuntu Jammy)
Status: Fix Committed => Fix Released
** Changed in: ubuntu-z-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Released
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
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[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Aligning to upstream stable ticket LP#1981864 for jammy, which is 'In
Progress' now.
** Changed in: ubuntu-z-systems
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Jammy)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
In Progress
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
This commit appeared now in v5.15.46, which will be handled in the next
weeks by the kernel team.
But I change the title to 22.04, since 21.10 is EOL as of today, and this patch
is not in jammy.
It got upstream accepted with v5.19-rc1 hence no need to patch kinetic, since
kinetic's target kernel is 5.19.
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Jammy)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: linux (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => (unassigned)
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Triaged
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
I'm glad to see that commit:
c9bfb460c3e4 c9bfb460c3e4da2462e16b0f0b200990b36b1dd2 "s390/perf: obtain
sie_block from the right address"
is tagged (upstream) for stable updates with:
Cc: sta...@vger.kernel.org
With that, this commit will automatically be picked up by the Ubuntu kernel
teams
"Focal update: v5.4.xxx upstream stable release" process.
This hasn't happened yet with the latest ticket:
"Focal update: v5.4.191 upstream stable release" - LP#1976116
but will be soon.
This LP bug will be used for tracking the status.
** Tags added: tracking-upstream-stable
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Tags removed: tracking-upstream-stable
** Tags added: upstream-stable
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1977962] Re: [UBUNTU 21.10] s390/perf: obtain sie_block from the right address
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: ubuntu-z-systems
Importance: Undecided => High
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1977962
Title:
[UBUNTU 21.10] s390/perf: obtain sie_block from the right address
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Bug description:
Description: s390/perf: obtain sie_block from the right address
Symptom: Read from unitialized stack memory, incorrect guest
perf data reported, possibly system crash.
Problem: When perf is instructed to record a software-based event and
to trace the guest, i.e. using the following command:
perf kvm --guest --guestvmlinux=endless.elf top -e cpu-clock
The reported guest instruction pointer is inaccurate or
the system may crash.
This is caused by the sie_block being taken from empty1[0]
in sie_block() in arch/s390/kernel/perf_event.c, but since
1179f170b6f0 ("s390: fix fpu restore in entry.S")
it resides at empty1[1].
Solution: Obtain sie_block from the right address in sie_block().
Reproduction: 1. Start a KVM guest executing an endless loop.
2. Determine the instruction address of the loop.
3. Start perf recording for any software event and trace
the guest, for example using this command:
perf kvm --guest --guestvmlinux=endless.elf top -e
cpu-clock
4. The reported guest instruction addresses don't match
the loop's instruction address or the system crashes.
Upstream-ID: c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
BBPF Probl.ID: 198450
Preventive:yes
Reported: -
SupportTicket: -
Reference: -
Date: 2022-06-02
Author:n...@linux.ibm.com
Component: kernel
Link:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9bfb460c3e4da2462e16b0f0b200990b36b1dd2
Problem occurs / affects impish and jammy
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1977962/+subscriptions
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