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Type: Bug
Resolution: Unresolved
Priority: Major
Fix Version/s: rhel-9.8
Affects Version/s: rhel-9.6
Component/s: kernel / Virtualization / KVM
Labels:
None

Regression:
No
Severity:
Important
sprint_count:
6

AssignedTeam:
rhel-virt-cloud-core
Sub-System Group:

ssg_virtualization

Dev Target Milestone:
17
Internal Target Milestone:
20
Story Points:
0
Blocked:
False
Ready:
False
Blocked Reason:

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None

Show
None
Product Documentation Required:
None
Sprint:
RHELOPC Sprint 49, RHELOPC Sprint 50, Virt-Cloud-Core Sprint 51, Virt-Cloud-Core Sprint 52, Virt-Cloud-Core Sprint 53, Virt-Cloud-Core Parking Lot

Preliminary Testing:
Requested
Testable Builds:

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The following Merge Request has pipeline job artifacts available:

Title: KVM: fix interaction between SMM and async page fault
MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7677
MR Pipeline: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/pipelines/2199194216

The Repo URLs are *not* accessible from a web browser! They only function as a dnf or yum baseurl.

Artifacts expire six weeks after creation. If artifacts are needed after that time please rerun the pipeline by visiting the MR's 'Pipelines' tab and clicking the 'Run pipeline' button.

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Downstream Pipeline Name: CENTOS (c9s_merge_request)
DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194291

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----------------------------------------

Downstream Pipeline Name: RHEL_COMPAT (c9s_rhel9_compat_merge_request)
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Downstream Pipeline Name: REALTIME (c9s_rt_merge_request)
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Downstream Pipeline Name: REALTIME_64K (c9s_rt_64k_merge_request)
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Downstream Pipeline Name: 64K (c9s_64k_merge_request)
DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194289

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Updated 2025-12-06 00:52 UTC by buglinker:
- KWF FAQ: https://red.ht/kernel_workflow_doc
- Slack #team-kernel-workflow: https://redhat-internal.slack.com/archives/C04LRUPMJQ5
- Source: https://gitlab.com/cki-project/kernel-workflow/-/blob/main/webhook/buglinker.py
- Documentation: https://gitlab.com/cki-project/kernel-workflow/-/blob/main/docs/README.buglinker.md
- Report an issue: https://issues.redhat.com/secure/CreateIssueDetails!init.jspa?pid=12334433&issuetype=1&priority=4&summary=buglinker+webhook+issue&components=kernel-workflow+/+buglinker

Show
The following Merge Request has pipeline job artifacts available: Title: KVM: fix interaction between SMM and async page fault MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7677 MR Pipeline: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/pipelines/2199194216 The Repo URLs are *not* accessible from a web browser! They only function as a dnf or yum baseurl. Artifacts expire six weeks after creation. If artifacts are needed after that time please rerun the pipeline by visiting the MR's 'Pipelines' tab and clicking the 'Run pipeline' button. ---------------------------------------- Downstream Pipeline Name: CENTOS (c9s_merge_request) DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194291 5.14.0-648.7677_2199194216.el9.s390x-debug: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194291/publish_s390x_debug/12342809604/artifacts/repo/5.14.0-648.7677_2199194216.el9.s390x/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/2199194291/publish_s390x_debug/12342809604/artifacts/repo/5.14.0-648.7677_2199194216.el9.s390x/ 5.14.0-648.7677_2199194216.el9.s390x: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194291/publish_s390x/12342809602/artifacts/repo/5.14.0-648.7677_2199194216.el9.s390x/ 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https://artifacts.internal.cki-project.org/arr-cki-prod-internal-artifacts/index.html?prefix=internal-artifacts/2199194292/publish_x86_64/12342809629/artifacts/repo/5.14.0-648.7677_2199194216.el9.x86_64/ Repo URL: https://artifacts.internal.cki-project.org/arr-cki-prod-internal-artifacts/internal-artifacts/2199194292/publish_x86_64/12342809629/artifacts/repo/5.14.0-648.7677_2199194216.el9.x86_64/ ---------------------------------------- Downstream Pipeline Name: REALTIME (c9s_rt_merge_request) DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194280 5.14.0-648.7677_2199194216.el9.aarch64: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194280/publish_aarch64/12342809475/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ Repo URL: 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https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/2199194280/publish_x86_64/12342809473/artifacts/repo/5.14.0-648.7677_2199194216.el9.x86_64/ ---------------------------------------- Downstream Pipeline Name: REALTIME_64K (c9s_rt_64k_merge_request) DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194294 5.14.0-648.7677_2199194216.el9.aarch64: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194294/publish_aarch64/12342809633/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/2199194294/publish_aarch64/12342809633/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ ---------------------------------------- Downstream Pipeline Name: 64K (c9s_64k_merge_request) DataWarehouse Checkout: https://datawarehouse.cki-project.org/kcidb/checkouts/redhat:2199194289 5.14.0-648.7677_2199194216.el9.aarch64-debug: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194289/publish_aarch64_debug/12342809570/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/2199194289/publish_aarch64_debug/12342809570/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ 5.14.0-648.7677_2199194216.el9.aarch64: Artifacts (RPMs): https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/index.html?prefix=trusted-artifacts/2199194289/publish_aarch64/12342809566/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ Repo URL: https://s3.amazonaws.com/arr-cki-prod-trusted-artifacts/trusted-artifacts/2199194289/publish_aarch64/12342809566/artifacts/repo/5.14.0-648.7677_2199194216.el9.aarch64/ ---------------------------------------- Updated 2025-12-06 00:52 UTC by buglinker: - KWF FAQ: https://red.ht/kernel_workflow_doc - Slack 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Test Coverage:
None

ProdDocsReview-CCS:
Unspecified
ProdDocsReview-Dev:
Unspecified
ProdDocsReview-QE:
Unspecified

Experience:
Architecture:

x86_64

PX Impact Score:
SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None
Release Milestone:

Merge Request passes all submitter checks, Merge Request finished CI testing, Merge Request passed CI testing, Merge Request approved by peer review

What were you trying to do that didn't work?

In a KVM guest we are seeing user-space threads getting hung indefinitely on async page faults:

Jun 03 19:45:03 kernel: INFO: task elasticsearch[e:7030 blocked for more than 1228 seconds.
Jun 03 19:45:03 kernel:       Not tainted 5.14.0-570.19.1.el9_6.x86_64 #1
Jun 03 19:45:03 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 03 19:45:03 kernel: task:elasticsearch[e state:D stack:0     pid:7030  tgid:2707  ppid:1340   flags:0x00000002
Jun 03 19:45:03 kernel: Call Trace:
Jun 03 19:45:03 kernel:  <TASK>
Jun 03 19:45:03 kernel:  __schedule+0x229/0x4a0
Jun 03 19:45:03 kernel:  schedule+0x2e/0xb0
Jun 03 19:45:03 kernel:  kvm_async_pf_task_wait_schedule+0xf3/0x180
Jun 03 19:45:03 kernel:  ? __count_memcg_events+0x4f/0xb0
Jun 03 19:45:03 kernel:  __kvm_handle_async_pf+0x53/0xb0
Jun 03 19:45:03 kernel:  exc_page_fault+0x7d/0x150
Jun 03 19:45:03 kernel:  asm_exc_page_fault+0x22/0x30
Jun 03 19:45:03 kernel: RIP: 0033:0x7faaafc94fa0
Jun 03 19:45:03 kernel: RSP: 002b:00007fa8e820f340 EFLAGS: 00010216
Jun 03 19:45:03 kernel: RAX: 00007e3ffac80000 RBX: 0000000039a00000 RCX: 0000000000005400
Jun 03 19:45:03 kernel: RDX: 0000000000010000 RSI: 00000003cd542e80 RDI: 00007e3ffac00000
Jun 03 19:45:03 kernel: RBP: 00007fa8e820f340 R08: 000000000000abe8 R09: 00007e3ffac00000
Jun 03 19:45:03 kernel: R10: 00007faaafc97a00 R11: 0000000000000000 R12: 0000000000000000
Jun 03 19:45:03 kernel: R13: 00007faaa1000000 R14: 00000003cd542e70 R15: 00007fa868001dc0
Jun 03 19:45:03 kernel:  </TASK>

What is the impact of this issue to you?

Huge impact as this can affect any process.

Please provide the package NVR for which the bug is seen:

Both the host and the guest are RHEL 9.6 with kernel-5.14.0-570.19.1.el9_6.x86_64
Also seen in a guest with kernel-5.14.0-503.35.1.el9_5.x86_64

How reproducible is this bug?:

Always in customer's environment when under high load. Not reproduced locally.

Steps to reproduce

Expected results

No hung threads.

Actual results

Hung threads on async page faults.

links to

[KCS] Process threads hung on kvm_async_pf_task_wait_schedule

Merge Request: KVM: fix interaction between SMM and async page fault

Details

Description

What were you trying to do that didn't work?

What is the impact of this issue to you?

Please provide the package NVR for which the bug is seen:

How reproducible is this bug?:

Steps to reproduce

Expected results

Actual results

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Issue Links

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