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Mon, 03 Aug 2026 22:26:17 -0700 (PDT) Date: Mon, 03 Aug 2026 22:26:17 -0700 In-Reply-To: <20260804-mglru-fg-v1-0-4d8dad39dad6@tencent.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7177f9.d35e88fd.de8b.000b.GAE@google.com> Subject: [syzbot ci] Re: mm/mglru: frequency guided promotion (MGLRU-FG) and flag cleanup From: syzbot ci To: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, cgroups@vger.kernel.org, chenridong@xiaomi.com, chrisl@kernel.org, david@kernel.org, dev.jain@arm.com, devnull@kernel.org, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, kasong@tencent.com, lance.yang@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@kernel.org, muchun.song@linux.dev, nico.pache@linux.dev, nphamcs@gmail.com, qi.zheng@linux.dev, rientjes@google.com, roman.gushchin@linux.dev, ryan.roberts@arm.com, ryncsn@gmail.com, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, sj@kernel.org, surenb@google.com, tz2294@columbia.edu, usama.arif@linux.dev, vbabka@kernel.org, vernon2gm@gmail.com, wangzicheng@honor.com, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, youngjun.park@lge.com, yuanchu@google.com, yuzhao@google.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] mm/mglru: frequency guided promotion (MGLRU-FG) and flag cleanup https://lore.kernel.org/all/20260804-mglru-fg-v1-0-4d8dad39dad6@tencent.com * [PATCH RFC 01/15] mm/memcontrol: make lru_zone_size atomic and simplify sanity check * [PATCH RFC 02/15] mm/memcontrol: allow update of LRU statistic without holding LRU lock * [PATCH RFC 03/15] mm/mglru: introduce and always use helpers for manipulating page flags * [PATCH RFC 04/15] mm/mglru: make generation page counters atomic * [PATCH RFC 05/15] mm/mglru: move max_seq read into walk_update_folio * [PATCH RFC 06/15] mm/mglru: use explicit tier range in read_ctrl_pos() * [PATCH RFC 07/15] mm/mglru: move refault workingset activation into lru_gen_refault * [PATCH RFC 08/15] mm/memcg: add folio-based lruvec live helper * [PATCH RFC 09/15] mm/mglru: frequency guided workingset promotion (MGLRU-FG) * [PATCH RFC 10/15] mm/mglru: make folio lru referenced times count a generic API * [PATCH RFC 11/15] mm/mglru: replace folio workinset check and update with new helper * [PATCH RFC 12/15] mm/smap: report workingset folios as referenced * [PATCH RFC 13/15] mm/huge_memory: mark file folio as accessed more accurately on split * [PATCH RFC 14/15] mm/khugepaged: consider workingset folios as referenced * [PATCH RFC 15/15] mm/madvise: convert to new lru refs API and better support for MGLRU and found the following issue: WARNING in folio_inc_lru_refs Full report is available here: https://ci.syzbot.org/series/5db36d1d-9faa-4882-9f0d-1a8f52132274 *** WARNING in folio_inc_lru_refs tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 94f9b3980dd446b56acf1dfed649e9b32a9f3813 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/9f324367-2b95-4fd0-9025-fef1ff1f605a/config page: refcount:3 mapcount:2 mapping:0000000000000000 index:0x0 pfn:0xe4ee flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002000 ffffea0000393b88 ffffea0000393b88 0000000000000000 raw: 0000000000000000 0000000000000000 0000000300000001 0000000000000000 page dumped because: VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled()) page_owner info is not present (never set?) ------------[ cut here ]------------ 1 WARNING: ./include/linux/memcontrol.h:745 at folio_inc_lru_refs+0xb4f/0xc10, CPU#0: mount/5025 Modules linked in: CPU: 0 UID: 0 PID: 5025 Comm: mount 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:folio_inc_lru_refs+0xb4f/0xc10 Code: ff 4c 89 e7 e8 c2 ae fd ff e9 e9 fc ff ff e8 18 91 ba ff 4c 89 e7 48 c7 c6 20 90 f8 8b e8 99 b0 1b ff c6 05 a6 a9 34 0e 01 90 <0f> 0b 90 e9 85 f6 ff ff e8 f4 90 ba ff e9 29 f8 ff ff 44 89 f1 80 RSP: 0018:ffffc9000324f4c0 EFLAGS: 00010246 RAX: 8e914a919570c700 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8e4b4187 RDI: ffff888174f53c00 RBP: ffffc9000324f5d0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1d3ca24 R12: ffffea0000393b80 R13: 1ffffd4000072770 R14: 1ffff92000649ea8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88818d949000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb77b215440 CR3: 000000000e946000 CR4: 00000000000006f0 Call Trace: __zap_vma_range+0x20f5/0x4f70 unmap_vmas+0x390/0x550 exit_mmap+0x293/0x9f0 __mmput+0x118/0x420 exit_mm+0x221/0x2d0 do_exit+0x6cd/0x2360 do_group_exit+0x22d/0x2f0 __x64_sys_exit_group+0x3f/0x40 x64_sys_call+0x221a/0x2240 do_syscall_64+0x174/0x580 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb77b2d3a90 Code: Unable to access opcode bytes at 0x7fb77b2d3a66. RSP: 002b:00007ffe32d58618 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fb77b3c4860 RCX: 00007fb77b2d3a90 RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00007fb77b3c4860 R08: 00007ffe32d58490 R09: 00007ffe32d58570 R10: 00007ffe32d584d0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb77b3c8658 R15: 0000000000000001 *** 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. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.