Message ID | 20230308220310.3119196-1-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Howlett" <Liam.Howlett@oracle.com> To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org> Cc: "Liam R. 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spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
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[v2] mm/ksm: Fix race with VMA iteration and mm_struct teardown
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diff --git a/mm/ksm.c b/mm/ksm.c index 525c3306e78b..d6280b258ece 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1044,9 +1044,15 @@ static int unmerge_and_remove_all_rmap_items(void) mm = mm_slot->slot.mm; mmap_read_lock(mm); + + /* + * Exit right away if mm is exiting to avoid lockdep issue in + * the maple tree + */ + if (ksm_test_exit(mm)) + goto mm_exiting; + for_each_vma(vmi, vma) { - if (ksm_test_exit(mm)) - break; if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma) continue; err = unmerge_ksm_pages(vma, @@ -1055,6 +1061,7 @@ static int unmerge_and_remove_all_rmap_items(void) goto error; } +mm_exiting: remove_trailing_rmap_items(&mm_slot->rmap_list); mmap_read_unlock(mm);