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AJvYcCVDwd2xZnXy3gnHFVLCzrnI07RXTxYiIP7qf+Ir8a0T1TtntapyiMDhODXFGHzAmMFc/xRDnmsx@vger.kernel.org X-Gm-Message-State: AOJu0Yy+fmxRH6x9DWxH+PRUWCEeOil8OAIM6hYGJN82r8LjSssuex3O b3A5WLn6e6dT+xIOn1KqZcTeK/kadU4yooS30ypYwmbsIG9ITlguapClo7Kw9RyH9Vxqtgh1Ary ltUO4yiri8lugR5iqQq+zhcpDkJpnTzhm8t51YJjP2p+gS8ZXenKb3lnILI4= Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2912:b0:67e:aa1:882e with SMTP id 006d021491bc7-67e0aa18df9mr1504176eaf.62.1774510895883; Thu, 26 Mar 2026 00:41:35 -0700 (PDT) Date: Thu, 26 Mar 2026 00:41:35 -0700 In-Reply-To: <20260325175453.2523280-1-youngjun.park@lge.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69c4e32f.a70a0220.23629d.000c.GAE@google.com> Subject: [syzbot ci] Re: mm/swap, memcg: Introduce swap tiers for cgroup based swap control From: syzbot ci To: akpm@linux-foundation.org, baohua@kernel.org, bhe@redhat.com, cgroups@vger.kernel.org, chrisl@kernel.org, gunho.lee@lge.com, hannes@cmpxchg.org, hyungjun.cho@lge.com, kasong@tencent.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, mkoutny@suse.com, muchun.song@linux.dev, nphamcs@gmail.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, taejoon.song@lge.com, youngjun.park@lge.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v5] mm/swap, memcg: Introduce swap tiers for cgroup based swap control https://lore.kernel.org/all/20260325175453.2523280-1-youngjun.park@lge.com * [PATCH v5 1/4] mm: swap: introduce swap tier infrastructure * [PATCH v5 2/4] mm: swap: associate swap devices with tiers * [PATCH v5 3/4] mm: memcontrol: add interfaces for swap tier selection * [PATCH v5 4/4] mm: swap: filter swap allocation by memcg tier mask and found the following issue: WARNING in folio_tier_effective_mask Full report is available here: https://ci.syzbot.org/series/6ed50ca2-a106-41e9-aa4d-7c46869e0011 *** WARNING in folio_tier_effective_mask tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 6381a729fa7dda43574d93ab9c61cec516dd885b arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/e5c66fa8-a7fd-4809-9564-448847b5f230/config C repro: https://ci.syzbot.org/findings/d64cc6fa-636a-40a0-b131-d02ce1129494/c_repro syz repro: https://ci.syzbot.org/findings/d64cc6fa-636a-40a0-b131-d02ce1129494/syz_repro ------------[ cut here ]------------ debug_locks && !(rcu_read_lock_held() || lock_is_held(&(&cgroup_mutex)->dep_map)) WARNING: ./include/linux/memcontrol.h:377 at obj_cgroup_memcg include/linux/memcontrol.h:377 [inline], CPU#1: syz.0.17/5955 WARNING: ./include/linux/memcontrol.h:377 at folio_memcg include/linux/memcontrol.h:431 [inline], CPU#1: syz.0.17/5955 WARNING: ./include/linux/memcontrol.h:377 at folio_tier_effective_mask+0x175/0x210 mm/swap_tier.h:63, CPU#1: syz.0.17/5955 Modules linked in: CPU: 1 UID: 0 PID: 5955 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:377 [inline] RIP: 0010:folio_memcg include/linux/memcontrol.h:431 [inline] RIP: 0010:folio_tier_effective_mask+0x175/0x210 mm/swap_tier.h:63 Code: 0f b6 04 20 84 c0 75 6b 8b 03 eb 0a e8 04 b8 9e ff b8 ff ff ff ff 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ec b7 9e ff 90 <0f> 0b 90 eb 9b 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c c2 fe ff ff RSP: 0018:ffffc90004bee6d0 EFLAGS: 00010293 RAX: ffffffff8226dd04 RBX: ffff888113589280 RCX: ffff8881727b8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffea0006c62207 R09: 1ffffd4000d8c440 R10: dffffc0000000000 R11: fffff94000d8c441 R12: dffffc0000000000 R13: ffffea0006c62208 R14: ffffea0006c62200 R15: ffffea0006c62230 FS: 00005555771cb500(0000) GS:ffff8882a9462000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ed63fff CR3: 0000000112d86000 CR4: 00000000000006f0 Call Trace: swap_alloc_fast mm/swapfile.c:1355 [inline] folio_alloc_swap+0x392/0x13a0 mm/swapfile.c:1735 shrink_folio_list+0x26a7/0x5250 mm/vmscan.c:1281 reclaim_folio_list+0x100/0x460 mm/vmscan.c:2171 reclaim_pages+0x45b/0x530 mm/vmscan.c:2208 madvise_cold_or_pageout_pte_range+0x1ef5/0x2220 mm/madvise.c:563 walk_pmd_range mm/pagewalk.c:142 [inline] walk_pud_range mm/pagewalk.c:233 [inline] walk_p4d_range mm/pagewalk.c:275 [inline] walk_pgd_range+0xfdc/0x1d90 mm/pagewalk.c:316 __walk_page_range+0x14c/0x710 mm/pagewalk.c:424 walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:728 madvise_pageout_page_range mm/madvise.c:622 [inline] madvise_pageout mm/madvise.c:647 [inline] madvise_vma_behavior+0x28b9/0x42c0 mm/madvise.c:1358 madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1713 madvise_do_behavior+0x386/0x540 mm/madvise.c:1929 do_madvise+0x1fa/0x2e0 mm/madvise.c:2022 __do_sys_madvise mm/madvise.c:2031 [inline] __se_sys_madvise mm/madvise.c:2029 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2029 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5e5af9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff0c8e2708 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f5e5b215fa0 RCX: 00007f5e5af9c799 RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007f5e5b032c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5e5b215fac R14: 00007f5e5b215fa0 R15: 00007f5e5b215fa0 *** 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.