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Memory Cgroup > https://lore.kernel.org/all/cover.1761658310.git.zhengqi.arch@bytedance.com > * [PATCH v1 01/26] mm: memcontrol: remove dead code of checking parent memory cgroup > * [PATCH v1 02/26] mm: workingset: use folio_lruvec() in workingset_refault() > * [PATCH v1 03/26] mm: rename unlock_page_lruvec_irq and its variants > * [PATCH v1 04/26] mm: vmscan: refactor move_folios_to_lru() > * [PATCH v1 05/26] mm: memcontrol: allocate object cgroup for non-kmem case > * [PATCH v1 06/26] mm: memcontrol: return root object cgroup for root memory cgroup > * [PATCH v1 07/26] mm: memcontrol: prevent memory cgroup release in get_mem_cgroup_from_folio() > * [PATCH v1 08/26] buffer: prevent memory cgroup release in folio_alloc_buffers() > * [PATCH v1 09/26] writeback: prevent memory cgroup release in writeback module > * [PATCH v1 10/26] mm: memcontrol: prevent memory cgroup release in count_memcg_folio_events() > * [PATCH v1 11/26] mm: page_io: prevent memory cgroup release in page_io module > * [PATCH v1 12/26] mm: migrate: prevent memory cgroup release in folio_migrate_mapping() > * [PATCH v1 13/26] mm: mglru: prevent memory cgroup release in mglru > * [PATCH v1 14/26] mm: memcontrol: prevent memory cgroup release in mem_cgroup_swap_full() > * [PATCH v1 15/26] mm: workingset: prevent memory cgroup release in lru_gen_eviction() > * [PATCH v1 16/26] mm: thp: prevent memory cgroup release in folio_split_queue_lock{_irqsave}() > * [PATCH v1 17/26] mm: workingset: prevent lruvec release in workingset_refault() > * [PATCH v1 18/26] mm: zswap: prevent lruvec release in zswap_folio_swapin() > * [PATCH v1 19/26] mm: swap: prevent lruvec release in swap module > * [PATCH v1 20/26] mm: workingset: prevent lruvec release in workingset_activation() > * [PATCH v1 21/26] mm: memcontrol: prepare for reparenting LRU pages for lruvec lock > * [PATCH v1 22/26] mm: vmscan: prepare for reparenting traditional LRU folios > * [PATCH v1 23/26] mm: vmscan: prepare for reparenting MGLRU folios > * [PATCH v1 24/26] mm: memcontrol: refactor memcg_reparent_objcgs() > * [PATCH v1 25/26] mm: memcontrol: eliminate the problem of dying memory cgroup for LRU folios > * [PATCH v1 26/26] mm: lru: add VM_WARN_ON_ONCE_FOLIO to lru maintenance helpers > > and found the following issue: > WARNING in folio_memcg > > Full report is available here: > https://ci.syzbot.org/series/0d48a77a-fb4f-485d-9fd6-086afd6fb650 > > *** > > WARNING in folio_memcg > > tree: mm-new > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git > base: b227c04932039bccc21a0a89cd6df50fa57e4716 > arch: amd64 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > config: https://ci.syzbot.org/builds/503d7034-ae99-44d1-8fb2-62e7ef5e1c7c/config > C repro: https://ci.syzbot.org/findings/880c374a-1b49-436e-9be2-63d5e2c6b6ab/c_repro > syz repro: https://ci.syzbot.org/findings/880c374a-1b49-436e-9be2-63d5e2c6b6ab/syz_repro > > exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0xe5674ec2, utbl_chksum : 0xe619d30d) > exFAT-fs (loop0): failed to load alloc-bitmap > exFAT-fs (loop0): failed to recognize exfat type > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 5965 at ./include/linux/memcontrol.h:380 obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] > WARNING: CPU: 1 PID: 5965 at ./include/linux/memcontrol.h:380 folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:434 This is understandable as the code snippet was added fairly recently and is easy to miss during rebasing. #syz test diff --git a/mm/zswap.c b/mm/zswap.c index a341814468b9..738d914e5354 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -896,11 +896,14 @@ static bool zswap_compress(struct page *page, struct zswap_entry *entry, * to the active LRU list in the case. */ if (comp_ret || !dlen || dlen >= PAGE_SIZE) { + rcu_read_lock(); if (!mem_cgroup_zswap_writeback_enabled( folio_memcg(page_folio(page)))) { + rcu_read_unlock(); comp_ret = comp_ret ? comp_ret : -EINVAL; goto unlock; } + rcu_read_unlock(); comp_ret = 0; dlen = PAGE_SIZE; dst = kmap_local_page(page);