{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: vmscan: remove deadlock due to throttling failing to make progress\n\nA soft lockup bug in kcompactd was reported in a private bugzilla with\nthe following visible in dmesg;\n\n  watchdog: BUG: soft lockup - CPU#33 stuck for 26s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 52s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 78s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 104s! [kcompactd0:479]\n\nThe machine had 256G of RAM with no swap and an earlier failed\nallocation indicated that node 0 where kcompactd was run was potentially\nunreclaimable;\n\n  Node 0 active_anon:29355112kB inactive_anon:2913528kB active_file:0kB\n    inactive_file:0kB unevictable:64kB isolated(anon):0kB isolated(file):0kB\n    mapped:8kB dirty:0kB writeback:0kB shmem:26780kB shmem_thp:\n    0kB shmem_pmdmapped: 0kB anon_thp: 23480320kB writeback_tmp:0kB\n    kernel_stack:2272kB pagetables:24500kB all_unreclaimable? yes\n\nVlastimil Babka investigated a crash dump and found that a task\nmigrating pages was trying to drain PCP lists;\n\n  PID: 52922  TASK: ffff969f820e5000  CPU: 19  COMMAND: \"kworker/u128:3\"\n  Call Trace:\n     __schedule\n     schedule\n     schedule_timeout\n     wait_for_completion\n     __flush_work\n     __drain_all_pages\n     __alloc_pages_slowpath.constprop.114\n     __alloc_pages\n     alloc_migration_target\n     migrate_pages\n     migrate_to_node\n     do_migrate_pages\n     cpuset_migrate_mm_workfn\n     process_one_work\n     worker_thread\n     kthread\n     ret_from_fork\n\nThis failure is specific to CONFIG_PREEMPT=n builds.  The root of the\nproblem is that kcompact0 is not rescheduling on a CPU while a task that\nhas isolated a large number of the pages from the LRU is waiting on\nkcompact0 to reschedule so the pages can be released.  While\nshrink_inactive_list() only loops once around too_many_isolated, reclaim\ncan continue without rescheduling if sc->skipped_deactivate == 1 which\ncould happen if there was no file LRU and the inactive anon list was not\nlow."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/vmscan.c"
               ],
               "versions": [
                  {
                     "version": "d818fca1cac3",
                     "lessThan": "3980cff63496",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d818fca1cac3",
                     "lessThan": "b485c6f1f9f5",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/vmscan.c"
               ],
               "versions": [
                  {
                     "version": "5.16",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.16",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16.10",
                     "lessThanOrEqual": "5.16.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.17",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/3980cff6349687f73d5109f156f23cb261c24164"
            },
            {
               "url": "https://git.kernel.org/stable/c/b485c6f1f9f54b81443efda5f3d8a5036ba2cd91"
            }
         ],
         "title": "mm: vmscan: remove deadlock due to throttling failing to make progress",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48800",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}