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e9e14a558f8ab-432f8fac67bmr9677295ab.9.1761685113513; Tue, 28 Oct 2025 13:58:33 -0700 (PDT) Date: Tue, 28 Oct 2025 13:58:33 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69012e79.050a0220.3344a1.03ee.GAE@google.com> Subject: [syzbot ci] Re: Eliminate Dying Memory Cgroup From: syzbot ci To: akpm@linux-foundation.org, axelrasmussen@google.com, cgroups@vger.kernel.org, chengming.zhou@linux.dev, david@redhat.com, hannes@cmpxchg.org, harry.yoo@oracle.com, hughd@google.com, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, muchun.song@linux.dev, nphamcs@gmail.com, qi.zheng@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, songmuchun@bytedance.com, weixugc@google.com, yuanchu@google.com, zhengqi.arch@bytedance.com, ziy@nvidia.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] Eliminate Dying 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 Modules linked in: CPU: 1 UID: 0 PID: 5965 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:obj_cgroup_memcg include/linux/memcontrol.h:380 [inline] RIP: 0010:folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:434 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 5f c8 06 00 48 8b 03 5b 41 5c 41 5e 41 5f 5d e9 cf 89 2a 09 cc e8 a9 bb a0 ff 90 <0f> 0b 90 eb ca 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff ff RSP: 0018:ffffc90003ec66b0 EFLAGS: 00010293 RAX: ffffffff821f4b57 RBX: ffff888108b31480 RCX: ffff88816be91d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88816be91d00 R09: 0000000000000002 R10: 00000000fffffff0 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000ffffffe4 R14: ffffea0006d5f840 R15: ffffea0006d5f870 FS: 000055555db87500(0000) GS:ffff8882a9f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ee63fff CR3: 000000010c308000 CR4: 00000000000006f0 Call Trace: zswap_compress mm/zswap.c:900 [inline] zswap_store_page mm/zswap.c:1430 [inline] zswap_store+0xfa2/0x1f80 mm/zswap.c:1541 swap_writeout+0x6e8/0xf20 mm/page_io.c:275 writeout mm/vmscan.c:651 [inline] pageout mm/vmscan.c:699 [inline] shrink_folio_list+0x34ec/0x4c40 mm/vmscan.c:1418 reclaim_folio_list+0xeb/0x500 mm/vmscan.c:2196 reclaim_pages+0x454/0x520 mm/vmscan.c:2233 madvise_cold_or_pageout_pte_range+0x1974/0x1d00 mm/madvise.c:565 walk_pmd_range mm/pagewalk.c:130 [inline] walk_pud_range mm/pagewalk.c:224 [inline] walk_p4d_range mm/pagewalk.c:262 [inline] walk_pgd_range+0xfe9/0x1d40 mm/pagewalk.c:303 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410 walk_page_range_vma+0x393/0x440 mm/pagewalk.c:717 madvise_pageout_page_range mm/madvise.c:624 [inline] madvise_pageout mm/madvise.c:649 [inline] madvise_vma_behavior+0x311f/0x3a10 mm/madvise.c:1352 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1669 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1885 do_madvise+0x1bc/0x270 mm/madvise.c:1978 __do_sys_madvise mm/madvise.c:1987 [inline] __se_sys_madvise mm/madvise.c:1985 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fccac38efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd9cc58708 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fccac5e5fa0 RCX: 00007fccac38efc9 RDX: 0000000000000015 RSI: 7fffffffffffffff RDI: 0000200000000000 RBP: 00007fccac411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fccac5e5fa0 R14: 00007fccac5e5fa0 R15: 0000000000000003 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.