Fedora Account System
Red Hat Associate
Red Hat Customer
In the Linux kernel, the following vulnerability has been resolved: migrate: correct lock ordering for hugetlb file folios Syzbot has found a deadlock (analyzed by Lance Yang): 1) Task (5749): Holds folio_lock, then tries to acquire i_mmap_rwsem(read lock). 2) Task (5754): Holds i_mmap_rwsem(write lock), then tries to acquire folio_lock. migrate_pages() -> migrate_hugetlbs() -> unmap_and_move_huge_page() <- Takes folio_lock! -> remove_migration_ptes() -> __rmap_walk_file() -> i_mmap_lock_read() <- Waits for i_mmap_rwsem(read lock)! hugetlbfs_fallocate() -> hugetlbfs_punch_hole() <- Takes i_mmap_rwsem(write lock)! -> hugetlbfs_zero_partial_page() -> filemap_lock_hugetlb_folio() -> filemap_lock_folio() -> __filemap_get_folio <- Waits for folio_lock! The migration path is the one taking locks in the wrong order according to the documentation at the top of mm/rmap.c. So expand the scope of the existing i_mmap_lock to cover the calls to remove_migration_ptes() too. This is (mostly) how it used to be after commit c0d0381ade79. That was removed by 336bf30eb765 for both file & anon hugetlb pages when it should only have been removed for anon hugetlb pages.
This comment was flagged as spam, view the edit history to see the original text if required.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:3463 https://access.redhat.com/errata/RHSA-2026:3463
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:3464 https://access.redhat.com/errata/RHSA-2026:3464
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:3488 https://access.redhat.com/errata/RHSA-2026:3488
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:4012 https://access.redhat.com/errata/RHSA-2026:4012
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2026:10108 https://access.redhat.com/errata/RHSA-2026:10108
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:11313 https://access.redhat.com/errata/RHSA-2026:11313
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Red Hat Enterprise Linux 8.6 Telecommunications Update Service Via RHSA-2026:13664 https://access.redhat.com/errata/RHSA-2026:13664
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:13681 https://access.redhat.com/errata/RHSA-2026:13681
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:13734 https://access.redhat.com/errata/RHSA-2026:13734
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2026:13936 https://access.redhat.com/errata/RHSA-2026:13936
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2026:14137 https://access.redhat.com/errata/RHSA-2026:14137
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:14301 https://access.redhat.com/errata/RHSA-2026:14301
This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:15883 https://access.redhat.com/errata/RHSA-2026:15883
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:26535 https://access.redhat.com/errata/RHSA-2026:26535