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AJvYcCUP87no3uma8vYi2LhHPXCZDZH2tXob56fExOXpgWb/QdrxE/DZMCCMQtxMc+nkqplcRD3q4MixUV73HDA=@vger.kernel.org X-Gm-Message-State: AOJu0YzanzYumzgpniIDiLSWvjF34zmGR4/QrOVxL3Bk2H6Rxtib7NdJ tBLDjJkTnDP0jY35MjiaqZwWyMWpVBPUrqAPpwFbi53iv/pjXyLT6p0Qs+9FxKpyts9fz3HlTBm coe0cH/pUk3YWuF+KPebQp+j98vCLp0NGsPWGG9zxA6tsF/rNSxt6X9iTq1I= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1689:b0:659:9a49:8de3 with SMTP id 006d021491bc7-6611891632fmr2171729eaf.37.1768642225708; Sat, 17 Jan 2026 01:30:25 -0800 (PST) Date: Sat, 17 Jan 2026 01:30:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <696b56b1.050a0220.3390f1.0007.GAE@google.com> Subject: [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout From: syzbot To: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 0f853ca2a798 Add linux-next specific files for 20260113 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14f7259a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8d6e5303d96e21b5 dashboard link: https://syzkaller.appspot.com/bug?extid=079a3b213add54dd18a7 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167ef922580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d295fa580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/480cd223f3f6/disk-0f853ca2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1ca2f0dbb7cc/vmlinux-0f853ca2.xz kernel image: https://storage.googleapis.com/syzbot-assets/60a0fef5805b/bzImage-0f853ca2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+079a3b213add54dd18a7@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: mm/memcontrol-v1.c:642 at memcg1_swapout+0x6c2/0x8d0 mm/memcontrol-v1.c:642, CPU#0: syz.4.233/6746 Modules linked in: CPU: 0 UID: 0 PID: 6746 Comm: syz.4.233 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:memcg1_swapout+0x6c2/0x8d0 mm/memcontrol-v1.c:642 Code: 6d 5d 0d 00 0f 85 01 fa ff ff 48 89 df 48 c7 c6 a0 c3 98 8b e8 bf 8c f8 fe c6 05 77 6d 5d 0d 01 90 0f 0b 90 e9 e2 f9 ff ff 90 <0f> 0b 90 e9 eb fb ff ff 90 0f 0b 90 41 80 3c 2e 00 0f 85 d5 fe ff RSP: 0018:ffffc9000bbae718 EFLAGS: 00010002 RAX: 0000000000000004 RBX: ffffea00017e9100 RCX: ffff888021f5c150 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc9000b59b404 RBP: dffffc0000000000 R08: ffffc9000b59b407 R09: 1ffff920016b3680 R10: dffffc0000000000 R11: fffff520016b3681 R12: ffffea00017e9108 R13: 1ffffd40002fd220 R14: 1ffffd40002fd221 R15: ffff88805398b178 FS: 00007fdd6c81a6c0(0000) GS:ffff888125bf7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000009a000 CR3: 0000000075930000 CR4: 00000000003526f0 Call Trace: __remove_mapping+0xac5/0xe30 mm/vmscan.c:764 shrink_folio_list+0x28d8/0x5320 mm/vmscan.c:1542 reclaim_folio_list+0xeb/0x4e0 mm/vmscan.c:2222 reclaim_pages+0x454/0x520 mm/vmscan.c:2259 madvise_cold_or_pageout_pte_range+0x19a0/0x1ce0 mm/madvise.c:563 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+0x1037/0x1d30 mm/pagewalk.c:303 __walk_page_range+0x14c/0x710 mm/pagewalk.c:410 walk_page_range_vma_unsafe+0x34c/0x400 mm/pagewalk.c:714 madvise_pageout_page_range mm/madvise.c:622 [inline] madvise_pageout mm/madvise.c:647 [inline] madvise_vma_behavior+0x30c7/0x4420 mm/madvise.c:1366 madvise_walk_vmas+0x575/0xaf0 mm/madvise.c:1721 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1937 do_madvise+0x1bc/0x270 mm/madvise.c:2030 __do_sys_madvise mm/madvise.c:2039 [inline] __se_sys_madvise mm/madvise.c:2037 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:2037 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdd6b98f749 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:00007fdd6c81a038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fdd6bbe5fa0 RCX: 00007fdd6b98f749 RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007fdd6ba13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdd6bbe6038 R14: 00007fdd6bbe5fa0 R15: 00007ffcd3996008 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup