cve-2024-49866
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:27
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4Patch
Impacted products
Vendor Product Version
Linux Linux Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
Version: c8895e271f7994a3ecb13b8a280e39aa53879545
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   Linux Linux Version: 5.14
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{
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                        id: "CVE-2024-49866",
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               product: "Linux",
               programFiles: [
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         descriptions: [
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               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/timerlat: Fix a race during cpuhp processing\n\nThere is another found exception that the \"timerlat/1\" thread was\nscheduled on CPU0, and lead to timer corruption finally:\n\n```\nODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220\nWARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0\nModules linked in:\nCPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\nRIP: 0010:debug_print_object+0x7d/0xb0\n...\nCall Trace:\n <TASK>\n ? __warn+0x7c/0x110\n ? debug_print_object+0x7d/0xb0\n ? report_bug+0xf1/0x1d0\n ? prb_read_valid+0x17/0x20\n ? handle_bug+0x3f/0x70\n ? exc_invalid_op+0x13/0x60\n ? asm_exc_invalid_op+0x16/0x20\n ? debug_print_object+0x7d/0xb0\n ? debug_print_object+0x7d/0xb0\n ? __pfx_timerlat_irq+0x10/0x10\n __debug_object_init+0x110/0x150\n hrtimer_init+0x1d/0x60\n timerlat_main+0xab/0x2d0\n ? __pfx_timerlat_main+0x10/0x10\n kthread+0xb7/0xe0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2d/0x40\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n```\n\nAfter tracing the scheduling event, it was discovered that the migration\nof the \"timerlat/1\" thread was performed during thread creation. Further\nanalysis confirmed that it is because the CPU online processing for\nosnoise is implemented through workers, which is asynchronous with the\noffline processing. When the worker was scheduled to create a thread, the\nCPU may has already been removed from the cpu_online_mask during the offline\nprocess, resulting in the inability to select the right CPU:\n\nT1                       | T2\n[CPUHP_ONLINE]           | cpu_device_down()\nosnoise_hotplug_workfn() |\n                         |     cpus_write_lock()\n                         |     takedown_cpu(1)\n                         |     cpus_write_unlock()\n[CPUHP_OFFLINE]          |\n    cpus_read_lock()     |\n    start_kthread(1)     |\n    cpus_read_unlock()   |\n\nTo fix this, skip online processing if the CPU is already offline.",
            },
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               url: "https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60d",
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               url: "https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915",
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         title: "tracing/timerlat: Fix a race during cpuhp processing",
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   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-49866",
      datePublished: "2024-10-21T18:01:09.284Z",
      dateReserved: "2024-10-21T12:17:06.018Z",
      dateUpdated: "2024-12-19T09:27:52.057Z",
      state: "PUBLISHED",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-49866\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:06.330\",\"lastModified\":\"2024-11-20T15:56:07.807\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing/timerlat: Fix a race during cpuhp processing\\n\\nThere is another found exception that the \\\"timerlat/1\\\" thread was\\nscheduled on CPU0, and lead to timer corruption finally:\\n\\n```\\nODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220\\nWARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0\\nModules linked in:\\nCPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\\nRIP: 0010:debug_print_object+0x7d/0xb0\\n...\\nCall Trace:\\n <TASK>\\n ? __warn+0x7c/0x110\\n ? debug_print_object+0x7d/0xb0\\n ? report_bug+0xf1/0x1d0\\n ? prb_read_valid+0x17/0x20\\n ? handle_bug+0x3f/0x70\\n ? exc_invalid_op+0x13/0x60\\n ? asm_exc_invalid_op+0x16/0x20\\n ? debug_print_object+0x7d/0xb0\\n ? debug_print_object+0x7d/0xb0\\n ? __pfx_timerlat_irq+0x10/0x10\\n __debug_object_init+0x110/0x150\\n hrtimer_init+0x1d/0x60\\n timerlat_main+0xab/0x2d0\\n ? __pfx_timerlat_main+0x10/0x10\\n kthread+0xb7/0xe0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x2d/0x40\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n </TASK>\\n```\\n\\nAfter tracing the scheduling event, it was discovered that the migration\\nof the \\\"timerlat/1\\\" thread was performed during thread creation. Further\\nanalysis confirmed that it is because the CPU online processing for\\nosnoise is implemented through workers, which is asynchronous with the\\noffline processing. When the worker was scheduled to create a thread, the\\nCPU may has already been removed from the cpu_online_mask during the offline\\nprocess, resulting in the inability to select the right CPU:\\n\\nT1                       | T2\\n[CPUHP_ONLINE]           | cpu_device_down()\\nosnoise_hotplug_workfn() |\\n                         |     cpus_write_lock()\\n                         |     takedown_cpu(1)\\n                         |     cpus_write_unlock()\\n[CPUHP_OFFLINE]          |\\n    cpus_read_lock()     |\\n    start_kthread(1)     |\\n    cpus_read_unlock()   |\\n\\nTo fix this, skip online processing if the CPU is already offline.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing/timerlat: corrige una ejecución durante el procesamiento de cpuhp. Se encontró otra excepción: el hilo \\\"timerlat/1\\\" se programó en CPU0 y finalmente provocó la corrupción del temporizador: ``` 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 Módulos vinculados: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 No contaminado 6.11.0-rc7+ #45 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 01/04/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Seguimiento de llamadas:  ? __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 ? ``` Después de rastrear el evento de programación, se descubrió que la migración del hilo \\\"timerlat/1\\\" se realizó durante la creación del hilo. Un análisis posterior confirmó que esto se debe a que el procesamiento en línea de la CPU para osnoise se implementa a través de trabajadores, que es asincrónico con el procesamiento fuera de línea. Cuando se programó el trabajador para crear un hilo, es posible que la CPU ya se haya eliminado de cpu_online_mask durante el proceso fuera de línea, lo que da como resultado la imposibilidad de seleccionar la CPU correcta: 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() | Para solucionar esto, omita el procesamiento en línea si la CPU ya está fuera de línea.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"5CD3CB21-008A-4AF9-9337-0FF92043AE5E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-49866\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:47:35.638203Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:47:38.748Z\"}}], \"cna\": {\"title\": \"tracing/timerlat: Fix a race during cpuhp processing\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"322920b53dc11f9c2b33397eb3ae5bc6a175b60d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"ce25f33ba89d6eefef64157655d318444580fa14\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"a6e9849063a6c8f4cb2f652a437e44e3ed24356c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"a0d9c0cd5856191e095cf43a2e141b73945b7716\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"f72b451dc75578f644a3019c1489e9ae2c14e6c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c8895e271f7994a3ecb13b8a280e39aa53879545\", \"lessThan\": \"829e0c9f0855f26b3ae830d17b24aec103f7e915\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/trace/trace_osnoise.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/trace/trace_osnoise.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60d\"}, {\"url\": \"https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14\"}, {\"url\": \"https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356c\"}, {\"url\": \"https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716\"}, {\"url\": \"https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4\"}, {\"url\": \"https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing/timerlat: Fix a race during cpuhp processing\\n\\nThere is another found exception that the \\\"timerlat/1\\\" thread was\\nscheduled on CPU0, and lead to timer corruption finally:\\n\\n```\\nODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220\\nWARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0\\nModules linked in:\\nCPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014\\nRIP: 0010:debug_print_object+0x7d/0xb0\\n...\\nCall Trace:\\n <TASK>\\n ? __warn+0x7c/0x110\\n ? debug_print_object+0x7d/0xb0\\n ? report_bug+0xf1/0x1d0\\n ? prb_read_valid+0x17/0x20\\n ? handle_bug+0x3f/0x70\\n ? exc_invalid_op+0x13/0x60\\n ? asm_exc_invalid_op+0x16/0x20\\n ? debug_print_object+0x7d/0xb0\\n ? debug_print_object+0x7d/0xb0\\n ? __pfx_timerlat_irq+0x10/0x10\\n __debug_object_init+0x110/0x150\\n hrtimer_init+0x1d/0x60\\n timerlat_main+0xab/0x2d0\\n ? __pfx_timerlat_main+0x10/0x10\\n kthread+0xb7/0xe0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x2d/0x40\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n </TASK>\\n```\\n\\nAfter tracing the scheduling event, it was discovered that the migration\\nof the \\\"timerlat/1\\\" thread was performed during thread creation. Further\\nanalysis confirmed that it is because the CPU online processing for\\nosnoise is implemented through workers, which is asynchronous with the\\noffline processing. When the worker was scheduled to create a thread, the\\nCPU may has already been removed from the cpu_online_mask during the offline\\nprocess, resulting in the inability to select the right CPU:\\n\\nT1                       | T2\\n[CPUHP_ONLINE]           | cpu_device_down()\\nosnoise_hotplug_workfn() |\\n                         |     cpus_write_lock()\\n                         |     takedown_cpu(1)\\n                         |     cpus_write_unlock()\\n[CPUHP_OFFLINE]          |\\n    cpus_read_lock()     |\\n    start_kthread(1)     |\\n    cpus_read_unlock()   |\\n\\nTo fix this, skip online processing if the CPU is already offline.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:27:52.057Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-49866\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:27:52.057Z\", \"dateReserved\": \"2024-10-21T12:17:06.018Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:09.284Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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