{"id":"DEBIAN-CVE-2022-48800","details":"In the Linux kernel, the following vulnerability has been resolved:  mm: vmscan: remove deadlock due to throttling failing to make progress  A soft lockup bug in kcompactd was reported in a private bugzilla with the following visible in dmesg;    watchdog: BUG: soft lockup - CPU#33 stuck for 26s! [kcompactd0:479]   watchdog: BUG: soft lockup - CPU#33 stuck for 52s! [kcompactd0:479]   watchdog: BUG: soft lockup - CPU#33 stuck for 78s! [kcompactd0:479]   watchdog: BUG: soft lockup - CPU#33 stuck for 104s! [kcompactd0:479]  The machine had 256G of RAM with no swap and an earlier failed allocation indicated that node 0 where kcompactd was run was potentially unreclaimable;    Node 0 active_anon:29355112kB inactive_anon:2913528kB active_file:0kB     inactive_file:0kB unevictable:64kB isolated(anon):0kB isolated(file):0kB     mapped:8kB dirty:0kB writeback:0kB shmem:26780kB shmem_thp:     0kB shmem_pmdmapped: 0kB anon_thp: 23480320kB writeback_tmp:0kB     kernel_stack:2272kB pagetables:24500kB all_unreclaimable? yes  Vlastimil Babka investigated a crash dump and found that a task migrating pages was trying to drain PCP lists;    PID: 52922  TASK: ffff969f820e5000  CPU: 19  COMMAND: \"kworker/u128:3\"   Call Trace:      __schedule      schedule      schedule_timeout      wait_for_completion      __flush_work      __drain_all_pages      __alloc_pages_slowpath.constprop.114      __alloc_pages      alloc_migration_target      migrate_pages      migrate_to_node      do_migrate_pages      cpuset_migrate_mm_workfn      process_one_work      worker_thread      kthread      ret_from_fork  This failure is specific to CONFIG_PREEMPT=n builds.  The root of the problem is that kcompact0 is not rescheduling on a CPU while a task that has isolated a large number of the pages from the LRU is waiting on kcompact0 to reschedule so the pages can be released.  While shrink_inactive_list() only loops once around too_many_isolated, reclaim can continue without rescheduling if sc-\u003eskipped_deactivate == 1 which could happen if there was no file LRU and the inactive anon list was not low.","modified":"2026-08-27T23:04:09.703127616Z","published":"2024-07-16T12:15:04.563Z","upstream":["CVE-2022-48800"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48800"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48800.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48800.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.10-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48800.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}