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8d2d22a55f
linux-yocto/mm
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Waiman Long 8d2d22a55f mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup() 
commit d1534ae23c2b6be350c8ab060803fbf6e9682adc upstream.

A soft lockup warning was observed on a relative small system x86-64
system with 16 GB of memory when running a debug kernel with kmemleak
enabled.

  watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134]

The test system was running a workload with hot unplug happening in
parallel.  Then kemleak decided to disable itself due to its inability to
allocate more kmemleak objects.  The debug kernel has its
CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000.

The soft lockup happened in kmemleak_do_cleanup() when the existing
kmemleak objects were being removed and deleted one-by-one in a loop via a
workqueue.  In this particular case, there are at least 40,000 objects
that need to be processed and given the slowness of a debug kernel and the
fact that a raw_spinlock has to be acquired and released in
__delete_object(), it could take a while to properly handle all these
objects.

As kmemleak has been disabled in this case, the object removal and
deletion process can be further optimized as locking isn't really needed.
However, it is probably not worth the effort to optimize for such an edge
case that should rarely happen.  So the simple solution is to call
cond_resched() at periodic interval in the iteration loop to avoid soft
lockup.

Link: https://lkml.kernel.org/r/20250728190248.605750-1-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-08-20 18:30:55 +02:00
..
damon mm/damon/core: commit damos->target_nid 2025-08-20 18:30:51 +02:00
kasan kasan: use vmalloc_dump_obj() for vmalloc error reports 2025-08-01 09:48:43 +01:00
kfence kfence: skip __GFP_THISNODE allocations on NUMA systems 2025-02-17 10:05:31 +01:00
kmsan dma: kmsan: export kmsan_handle_dma() for modules 2025-03-13 13:01:58 +01:00
backing-dev.c writeback: support retrieving per group debug writeback stats of bdi 2024-05-05 17:53:51 -07:00
balloon_compaction.c mm: remove MIGRATE_SYNC_NO_COPY mode 2024-07-03 19:30:00 -07:00
bootmem_info.c
cma_debug.c
cma_sysfs.c
cma.c mm/cma: add cma_{alloc,free}_folio() 2024-09-03 21:15:36 -07:00
cma.h
compaction.c mm/compaction: fix bug in hugetlb handling pathway 2025-04-25 10:47:53 +02:00
debug_page_alloc.c
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: Use pxdp_get() for accessing page table entries 2024-09-17 01:07:01 -07:00
debug.c mm: open-code page_folio() in dump_page() 2024-12-14 20:03:33 +01:00
dmapool_test.c mm/dmapool: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
dmapool.c
early_ioremap.c
execmem.c mm/execmem, arch: convert remaining overrides of module_alloc to execmem 2024-05-14 00:31:43 -07:00
fadvise.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
fail_page_alloc.c fault-inject: improve build for CONFIG_FAULT_INJECTION=n 2024-09-01 20:43:33 -07:00
failslab.c fault-inject: improve build for CONFIG_FAULT_INJECTION=n 2024-09-01 20:43:33 -07:00
filemap.c mm: fix filemap_get_folios_contig returning batches of identical folios 2025-04-25 10:47:53 +02:00
folio-compat.c mm: remove putback_lru_page() 2024-09-09 16:38:59 -07:00
gup_test.c
gup_test.h
gup.c mm/gup: revert "mm: gup: fix infinite loop within __get_longterm_locked" 2025-07-06 11:01:43 +02:00
highmem.c mm/highmem: make nr_free_highpages() return "unsigned long" 2024-07-03 19:30:06 -07:00
hmm.c mm/hmm: move pmd_to_hmm_pfn_flags() to the respective #ifdeffery 2025-08-15 12:14:13 +02:00
huge_memory.c mm/huge_memory: fix dereferencing invalid pmd migration entry 2025-05-18 08:24:51 +02:00
hugetlb_cgroup.c mm: memcg: don't call propagate_protected_usage() needlessly 2024-09-01 20:25:50 -07:00
hugetlb_vmemmap.c mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO 2024-09-01 20:25:45 -07:00
hugetlb_vmemmap.h
hugetlb.c mm/hugetlb: unshare page tables during VMA split, not before 2025-06-27 11:11:40 +01:00
hwpoison-inject.c mm/hwpoison: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
init-mm.c
internal.h mm: fix folio_pte_batch() on XEN PV 2025-05-18 08:24:51 +02:00
interval_tree.c
io-mapping.c
ioremap.c
Kconfig resource: remove dependency on SPARSEMEM from GET_FREE_REGION 2024-10-28 21:40:39 -07:00
Kconfig.debug slub: Introduce CONFIG_SLUB_RCU_DEBUG 2024-08-27 14:12:51 +02:00
khugepaged.c mm: khugepaged: fix call hpage_collapse_scan_file() for anonymous vma 2025-08-01 09:48:47 +01:00
kmemleak.c mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup() 2025-08-20 18:30:55 +02:00
ksm.c mm/ksm: fix -Wsometimes-uninitialized from clang-21 in advisor_mode_show() 2025-08-01 09:48:42 +01:00
list_lru.c mm: list_lru: fix UAF for memory cgroup 2024-08-07 18:33:56 -07:00
maccess.c
madvise.c mm: close theoretical race where stale TLB entries could linger 2025-06-27 11:11:38 +01:00
Makefile mm: introduce numa_emulation 2024-09-03 21:15:31 -07:00
mapping_dirty_helpers.c
memblock.c memblock: Accept allocated memory before use in memblock_double_array() 2025-05-18 08:24:54 +02:00
memcontrol-v1.c mm/thp: fix deferred split unqueue naming and locking 2024-11-05 16:49:54 -08:00
memcontrol-v1.h mm: memcg: declare do_memsw_account inline 2024-12-14 20:03:33 +01:00
memcontrol.c memcg: always call cond_resched() after fn() 2025-05-29 11:03:22 +02:00
memfd.c mm: reinstate ability to map write-sealed memfd mappings read-only 2025-01-09 13:33:54 +01:00
memory_hotplug.c mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper 2025-04-20 10:15:50 +02:00
memory-failure.c mm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list 2025-08-01 09:48:44 +01:00
memory-tiers.c memory tiers: use default_dram_perf_ref_source in log message 2024-09-26 14:01:44 -07:00
memory.c mm: fix apply_to_existing_page_range() 2025-04-25 10:47:53 +02:00
mempolicy.c mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM 2024-12-14 20:03:32 +01:00
mempool.c mm: fix xyz_noprof functions calling profiled functions 2024-06-05 19:19:26 -07:00
memremap.c mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs() 2024-05-05 17:53:49 -07:00
memtest.c
migrate_device.c mm/migrate_device: don't add folio to be freed to LRU in migrate_device_finalize() 2025-02-27 04:30:22 -08:00
migrate.c mm/migrate: fix shmem xarray update during migration 2025-03-28 22:03:30 +01:00
mincore.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
mlock.c mm/mlock: set the correct prev on failure 2024-11-07 14:14:58 -08:00
mm_init.c mm: drop CONFIG_HAVE_ARCH_NODEDATA_EXTENSION 2024-09-03 21:15:28 -07:00
mm_slot.h
mmap_lock.c mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer 2024-07-03 19:30:26 -07:00
mmap.c mm: reinstate ability to map write-sealed memfd mappings read-only 2025-01-09 13:33:54 +01:00
mmu_gather.c
mmu_notifier.c mm: move internal core VMA manipulation functions to own file 2024-09-01 20:25:54 -07:00
mmzone.c mm: improve code consistency with zonelist_* helper functions 2024-09-01 20:25:55 -07:00
mprotect.c mm: refactor map_deny_write_exec() 2024-11-05 16:49:55 -08:00
mremap.c mm/mremap: correctly handle partial mremap() of VMA starting at 0 2025-04-20 10:15:49 +02:00
mseal.c ALong with the usual shower of singleton patches, notable patch series in 2024-09-21 07:29:05 -07:00
msync.c
nommu.c nommu: pass NULL argument to vma_iter_prealloc() 2024-11-11 17:20:23 -08:00
numa_emulation.c mm: introduce numa_emulation 2024-09-03 21:15:31 -07:00
numa_memblks.c mm: numa_clear_kernel_node_hotplug: Add NUMA_NO_NODE check for node id 2024-10-28 21:40:40 -07:00
numa.c mm: make range-to-target_node lookup facility a part of numa_memblks 2024-09-03 21:15:32 -07:00
oom_kill.c memcg: fix soft lockup in the OOM process 2025-02-08 09:58:19 +01:00
page_alloc.c page_pool: Move pp_magic check into helper functions 2025-06-19 15:31:42 +02:00
page_counter.c mm, memcg: cg2 memory{.swap,}.peak write handlers 2024-09-01 20:25:53 -07:00
page_ext.c mm: don't account memmap per-node 2024-08-15 22:16:14 -07:00
page_idle.c
page_io.c mm: count zeromap read and set for swapout and swapin 2024-11-11 00:00:37 -08:00
page_isolation.c mm/hugetlb: wait for hugetlb folios to be freed 2025-03-22 12:54:28 -07:00
page_owner.c mm/page-owner: use gfp_nested_mask() instead of open coded masking 2024-05-19 14:40:44 -07:00
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c mm/page_table_check: fix crash on ZONE_DEVICE 2024-06-15 10:43:04 -07:00
page_vma_mapped.c mm: make page_mapped_in_vma() hugetlb walk aware 2025-04-20 10:15:49 +02:00
page-writeback.c mm: fix ratelimit_pages update error in dirty_ratio_handler() 2025-06-27 11:11:22 +01:00
pagewalk.c mm/pagewalk: fix usage of pmd_leaf()/pud_leaf() without present check 2024-10-28 21:40:38 -07:00
percpu-internal.h mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c percpu: remove pcpu_alloc_size() 2024-09-01 20:26:04 -07:00
pgalloc-track.h
pgtable-generic.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-05-07 10:37:00 -07:00
process_vm_access.c
ptdump.c mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() 2025-08-20 18:30:55 +02:00
readahead.c mm/readahead: fix large folio support in async readahead 2025-01-09 13:33:54 +01:00
rmap.c mm/rmap: reject hugetlb folios in folio_make_device_exclusive() 2025-04-20 10:15:49 +02:00
rodata_test.c
secretmem.c fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass 2025-07-10 16:05:09 +02:00
shmem_quota.c shmem_quota: build the object file conditionally to the config option 2024-09-01 20:25:45 -07:00
shmem.c mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper 2025-04-20 10:15:50 +02:00
show_mem.c mm/show_mem.c: report alloc tags in human readable units 2024-09-17 01:07:00 -07:00
shrinker_debug.c mm: shrinker: use min() to improve shrinker_debugfs_scan_write() 2024-09-03 21:15:40 -07:00
shrinker.c mm: shrinker: avoid memleak in alloc_shrinker_info 2024-10-31 20:27:04 -07:00
shuffle.c
shuffle.h
slab_common.c slab: Fix too strict alignment check in create_cache() 2024-12-09 10:41:07 +01:00
slab.h mm/slub: Avoid list corruption when removing a slab from the full list 2024-12-09 10:41:04 +01:00
slub.c mm, slab: restore NUMA policy support for large kmalloc 2025-08-20 18:30:55 +02:00
sparse-vmemmap.c LoongArch: Set initial pte entry with PAGE_GLOBAL for kernel space 2024-10-21 22:11:19 +08:00
sparse.c A set of X86 fixes: 2024-09-01 14:43:08 -07:00
swap_cgroup.c mm: attempt to batch free swap entries for zap_pte_range() 2024-09-03 21:15:33 -07:00
swap_slots.c
swap_state.c mm: add nr argument in mem_cgroup_swapin_uncharge_swap() helper to support large folios 2024-09-17 01:07:01 -07:00
swap.c mm: page_alloc: move mlocked flag clearance into free_pages_prepare() 2024-11-11 17:20:23 -08:00
swap.h mm: fix swap_read_folio_zeromap() for large folios with partial zeromap 2024-09-17 01:07:01 -07:00
swapfile.c mm: swap: fix potential buffer overflow in setup_clusters() 2025-08-15 12:14:14 +02:00
truncate.c mm: Fix missing folio invalidation calls during truncation 2024-08-24 16:09:16 +02:00
usercopy.c
userfaultfd.c userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry 2025-08-20 18:30:54 +02:00
util.c mm: only enforce minimum stack gap size if it's sensible 2024-09-01 20:26:02 -07:00
vma_internal.h mm/hugetlb: unshare page tables during VMA split, not before 2025-06-27 11:11:40 +01:00
vma.c mm/vma: reset VMA iterator on commit_merge() OOM failure 2025-07-06 11:01:48 +02:00
vma.h mm/vma: add give_up_on_oom option on modify/merge, use in uffd release 2025-04-25 10:48:06 +02:00
vmalloc.c mm/vmalloc: leave lazy MMU mode on PTE mapping error 2025-07-17 18:37:14 +02:00
vmpressure.c
vmscan.c mm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list 2025-08-01 09:48:44 +01:00
vmstat.c vmstat: call fold_vm_zone_numa_events() before show per zone NUMA event 2024-12-09 10:41:01 +01:00
workingset.c cachestat: do not flush stats in recency check 2024-07-03 22:40:37 -07:00
z3fold.c mm/z3fold: add __percpu annotation to *unbuddied pointer in struct z3fold_pool 2024-09-01 20:25:56 -07:00
zbud.c
zpool.c
zsmalloc.c mm/zsmalloc: do not pass __GFP_MOVABLE if CONFIG_COMPACTION=n 2025-08-01 09:48:44 +01:00
zswap.c mm: zswap: fix crypto_free_acomp() deadlock in zswap_cpu_comp_dead() 2025-04-10 14:39:40 +02:00