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In the Linux kernel, the following vulnerability has been resolved:
tracing/timerlat: Fix a race during cpuhp processing
There is another found exception that the "timerlat/1" thread was scheduled on CPU0, and lead to timer corruption finally:
``` ODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220 WARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0 Modules linked in: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Call Trace: <TASK> ? __warn+0x7c/0x110 ? debug_print_object+0x7d/0xb0 ? report_bug+0xf1/0x1d0 ? prb_read_valid+0x17/0x20 ? handle_bug+0x3f/0x70 ? exc_invalid_op+0x13/0x60 ? asm_exc_invalid_op+0x16/0x20 ? debug_print_object+0x7d/0xb0 ? debug_print_object+0x7d/0xb0 ? __pfx_timerlat_irq+0x10/0x10 __debug_object_init+0x110/0x150 hrtimer_init+0x1d/0x60 timerlat_main+0xab/0x2d0 ? __pfx_timerlat_main+0x10/0x10 kthread+0xb7/0xe0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2d/0x40 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> ```
After tracing the scheduling event, it was discovered that the migration of the "timerlat/1" thread was performed during thread creation. Further analysis confirmed that it is because the CPU online processing for osnoise is implemented through workers, which is asynchronous with the offline processing. When the worker was scheduled to create a thread, the CPU may has already been removed from the cpu_online_mask during the offline process, resulting in the inability to select the right CPU:
T1 | T2 [CPUHP_ONLINE] | cpu_device_down() osnoise_hotplug_workfn() | | cpus_write_lock() | takedown_cpu(1) | cpus_write_unlock() [CPUHP_OFFLINE] | cpus_read_lock() | start_kthread(1) | cpus_read_unlock() |
To fix this, skip online processing if the CPU is already offline.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Nov 11, 2024 | Oct 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1006-gkeopUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-nvidiaUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-1014-azure-nvidiaUpgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-6.8.0-54-genericUpgrade linux-image-6.8.0-54-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-azure-nvidiaUpgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-azure-lts-24.04Upgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-virtualUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-6.8.0-1019-gkeUpgrade linux-image-6.8.0-1022-nvidiaUpgrade linux-image-gke-5.15Upgrade linux-image-kvmUpgrade linux-image-oem-20.04bUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-oem-22.04cUpgrade linux-image-azure-fdeUpgrade linux-image-oem-24.04bUpgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-generic-lpaeUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-ibmUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-6.8.0-54-generic-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1025-azure-fdeUpgrade linux-image-6.8.0-57-generic-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-gkeop-6.8Upgrade linux-image-aws-lts-22.04Upgrade linux-image-nvidia-64kUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1024-gcp-64kUpgrade linux-image-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-6.8.0-1022-nvidia-64kUpgrade linux-image-azure-fde-lts-24.04Upgrade linux-image-6.11.0-1009-azureUpgrade linux-image-6.8.0-1022-ibmUpgrade linux-image-oem-24.04aUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-awsUpgrade linux-image-6.8.0-1024-gcpUpgrade linux-image-oem-20.04dUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-54-lowlatencyUpgrade linux-image-oem-22.04bUpgrade linux-image-gcpUpgrade linux-image-oem-22.04aUpgrade linux-image-6.8.0-1022-nvidia-lowlatency-64kUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-oracle-64kUpgrade linux-image-genericUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-5.15.0-1073-awsUpgrade linux-image-gkeop-5.15Upgrade linux-image-nvidia-6.8Upgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-1024-oemUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-intelUpgrade linux-image-aws-lts-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-oracle-lts-24.04Upgrade linux-image-azure-lts-22.04Upgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-azureUpgrade linux-image-realtimeUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-5.15.0-1078-azureUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-oem-20.04Upgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-azure-cvmUpgrade linux-image-6.8.0-1020-oracleUpgrade linux-image-6.8.0-1025-azureUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-1019-raspiUpgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-6.8.0-57-genericUpgrade linux-image-oem-22.04Upgrade linux-image-gkeopUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-6.11.0-18-genericUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.8.0-1023-awsUpgrade linux-image-oem-22.04dUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1020-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-gkeUpgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-lowlatency-64kUpgrade linux-image-generic-64kUpgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1022-nvidia-lowlatencyUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-5.15.0-127-genericUpgrade linux-image-intel-iotgUpgrade linux-image-gcp-lts-22.04 | Dec 18, 2024 | Oct 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 14, 2025 | Oct 21, 2024 |
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