Syzbot CI

Subject	mm/virtio: skip redundant zeroing of host-zeroed reported pages
Author	mst@redhat.com
Date	2026-04-20 12:50:20 +0000 UTC
Version
Cc	aarcange@redhat.com akpm@linux-foundation.org apopple@nvidia.com axelrasmussen@google.com baohua@kernel.org baolin.wang@linux.alibaba.com bhe@redhat.com byungchul@sk.com chrisl@kernel.org david@kernel.org dev.jain@arm.com eperezma@redhat.com gourry@gourry.net hannes@cmpxchg.org hughd@google.com jackmanb@google.com jasowang@redhat.com joshua.hahnjy@gmail.com kasong@tencent.com lance.yang@linux.dev liam.howlett@oracle.com linux-kernel@vger.kernel.org linux-mm@kvack.org ljs@kernel.org matthew.brost@intel.com mhocko@suse.com mst@redhat.com muchun.song@linux.dev npache@redhat.com nphamcs@gmail.com osalvador@suse.de rakie.kim@sk.com rppt@kernel.org ryan.roberts@arm.com shikemeng@huaweicloud.com surenb@google.com vbabka@kernel.org virtualization@lists.linux.dev weixugc@google.com xuanzhuo@linux.alibaba.com ying.huang@linux.alibaba.com yuanchu@google.com ziy@nvidia.com

Subject

mm/virtio: skip redundant zeroing of host-zeroed reported pages

Author

mst@redhat.com

Date

2026-04-20 12:50:20 +0000 UTC

Version

aarcange@redhat.com akpm@linux-foundation.org apopple@nvidia.com axelrasmussen@google.com baohua@kernel.org baolin.wang@linux.alibaba.com bhe@redhat.com byungchul@sk.com chrisl@kernel.org david@kernel.org dev.jain@arm.com eperezma@redhat.com gourry@gourry.net hannes@cmpxchg.org hughd@google.com jackmanb@google.com jasowang@redhat.com joshua.hahnjy@gmail.com kasong@tencent.com lance.yang@linux.dev liam.howlett@oracle.com linux-kernel@vger.kernel.org linux-mm@kvack.org ljs@kernel.org matthew.brost@intel.com mhocko@suse.com mst@redhat.com muchun.song@linux.dev npache@redhat.com nphamcs@gmail.com osalvador@suse.de rakie.kim@sk.com rppt@kernel.org ryan.roberts@arm.com shikemeng@huaweicloud.com surenb@google.com vbabka@kernel.org virtualization@lists.linux.dev weixugc@google.com xuanzhuo@linux.alibaba.com ying.huang@linux.alibaba.com yuanchu@google.com ziy@nvidia.com

Name	Content [All]
[PATCH RFC v2 01/18] mm: page_alloc: propagate PageReported flag across buddy splits	[Body]
[PATCH RFC v2 02/18] mm: add pghint_t type and vma_alloc_folio_hints API	[Body]
[PATCH RFC v2 03/18] mm: add PG_zeroed page flag for known-zero pages	[Body]
[PATCH RFC v2 04/18] mm: page_alloc: track PG_zeroed across buddy merges	[Body]
[PATCH RFC v2 05/18] mm: page_alloc: preserve PG_zeroed in try_to_claim_block	[Body]
[PATCH RFC v2 06/18] mm: page_alloc: thread pghint_t through get_page_from_freelist	[Body]
[PATCH RFC v2 07/18] mm: post_alloc_hook: use PG_zeroed to skip zeroing, return pghint_t	[Body]
[PATCH RFC v2 08/18] mm: hugetlb: thread pghint_t through buddy allocation chain	[Body]
[PATCH RFC v2 09/18] mm: hugetlb: use PG_zeroed for pool pages, skip redundant zeroing	[Body]
[PATCH RFC v2 10/18] mm: page_reporting: support host-zeroed reported pages	[Body]
[PATCH RFC v2 11/18] mm: skip zeroing in vma_alloc_zeroed_movable_folio for pre-zeroed pages	[Body]
[PATCH RFC v2 12/18] mm: skip zeroing in alloc_anon_folio for pre-zeroed pages	[Body]
[PATCH RFC v2 13/18] mm: skip zeroing in vma_alloc_anon_folio_pmd for pre-zeroed pages	[Body]
[PATCH RFC v2 14/18] mm: memfd: skip zeroing for pre-zeroed hugetlb pages	[Body]
[PATCH RFC v2 15/18] virtio_balloon: add host_zeroes_pages module parameter	[Body]
[PATCH RFC v2 16/18] mm: page_reporting: add flush parameter with page budget	[Body]
[PATCH RFC v2 17/18] mm: add free_frozen_pages_hint and put_page_hint APIs	[Body]
[PATCH RFC v2 18/18] virtio_balloon: mark deflated pages as pre-zeroed	[Body]

Name

Content [All]

[PATCH RFC v2 01/18] mm: page_alloc: propagate PageReported flag across buddy splits

[PATCH RFC v2 02/18] mm: add pghint_t type and vma_alloc_folio_hints API

[PATCH RFC v2 03/18] mm: add PG_zeroed page flag for known-zero pages

[PATCH RFC v2 04/18] mm: page_alloc: track PG_zeroed across buddy merges

[PATCH RFC v2 05/18] mm: page_alloc: preserve PG_zeroed in try_to_claim_block

[PATCH RFC v2 06/18] mm: page_alloc: thread pghint_t through get_page_from_freelist

[PATCH RFC v2 07/18] mm: post_alloc_hook: use PG_zeroed to skip zeroing, return pghint_t

[PATCH RFC v2 08/18] mm: hugetlb: thread pghint_t through buddy allocation chain

[PATCH RFC v2 09/18] mm: hugetlb: use PG_zeroed for pool pages, skip redundant zeroing

[PATCH RFC v2 10/18] mm: page_reporting: support host-zeroed reported pages

[PATCH RFC v2 11/18] mm: skip zeroing in vma_alloc_zeroed_movable_folio for pre-zeroed pages

[PATCH RFC v2 12/18] mm: skip zeroing in alloc_anon_folio for pre-zeroed pages

[PATCH RFC v2 13/18] mm: skip zeroing in vma_alloc_anon_folio_pmd for pre-zeroed pages

[PATCH RFC v2 14/18] mm: memfd: skip zeroing for pre-zeroed hugetlb pages

[PATCH RFC v2 15/18] virtio_balloon: add host_zeroes_pages module parameter

[PATCH RFC v2 16/18] mm: page_reporting: add flush parameter with page budget

[PATCH RFC v2 17/18] mm: add free_frozen_pages_hint and put_page_hint APIs

[PATCH RFC v2 18/18] virtio_balloon: mark deflated pages as pre-zeroed

Session 2026-04-20

1 Findings

ID (for dev)	4ecb8bed-1693-497b-9451-b75a55d63a66
Status	finished
Triaged	OK [Log]
Execution Log	[Link]

Test	Base	Patched	Verdict
[KASAN] Build Base	b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config]		passed [Log]
[KASAN] Boot test: Base	b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config]		passed [Log]
[KASAN] Build Patched		b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config] [patched]	passed [Log]
[KASAN] Boot test: Patched		b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config] [patched]	passed [Log]
[KASAN] Fuzz	b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config]	b8a5774cd49996e8ef83b1637a9b547158f18de9 [Config] [patched]	passed [Log] [Artifacts]
finding kernel BUG in free_huge_folio Log Syz Repro

Patches (18)

Series Summary

Sessions

Session 2026-04-20