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Fri, 09 Jan 2026 00:57:20 -0800 (PST) Date: Fri, 09 Jan 2026 00:57:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6960c2f0.050a0220.1c677c.03be.GAE@google.com> Subject: [syzbot] [mm?] [cgroups?] kernel BUG in swap_cgroup_record (2) 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" X-Stat-Signature: xh3pxsyek1ptrhd1ij5wdy4uegnbypyd X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 22004180003 X-Rspam-User: X-HE-Tag: 1767949040-772582 X-HE-Meta: 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 wZBfnrpc 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 zHSoDnSs WkU2SeGaDLKE3XvMYxHqvmGJ94OKwpzFEiCX53JY36k1EvnDWzzOrmPRJ7HXl4uJpUfr1qNOwTjKtX9C+NWqHwijp59IHLvVI79PJu2zTfHDr8P9jQRyuHjyrJRtZtvUBuqByahLel2t+xu0Ec/rLp5eUXA0F9h7X3i59xnE+nogZhc6F30zlLQsUDybURcLbZVenLHwhqz/3EQvpPPJ6DAws6c6FalmHQ1Cmu9BqSklHCNpdu9uMPBIxoqWyf9/UUYW3vs5J0uO6va54U+fFVFL/W/m1DmIxGs1Gp0JQsGhQ5KfeXiHsIazTp1L5WOA9t0uJnWHEVrCiCTmkVcooOYl1RyTXhmlwvok7QBxatuSX5DiDFBBJ5Dz9fqHxq26SqIhzCa9TwgfMgdAZs6Sp9OUtkJpBbtymFn2mR5AEVQ= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: f8f97927abf7 Add linux-next specific files for 20260105 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=131ff69a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0672dd8d69c3235 dashboard link: https://syzkaller.appspot.com/bug?extid=d97580a8cceb9b03c13e 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=17065efc580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=176c9e9a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1837bbc8e23e/disk-f8f97927.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/07390717f7e4/vmlinux-f8f97927.xz kernel image: https://storage.googleapis.com/syzbot-assets/8f4a72ec80dc/bzImage-f8f97927.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d97580a8cceb9b03c13e@syzkaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at mm/swap_cgroup.c:78! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6176 Comm: syz.0.30 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:swap_cgroup_record+0x19c/0x1c0 mm/swap_cgroup.c:78 Code: 02 e9 6d ff ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 35 ff ff ff 4c 89 f7 e8 cf 84 f6 ff e9 28 ff ff ff e8 e5 c1 8f ff 90 <0f> 0b e8 dd c1 8f ff 4c 89 f7 48 c7 c6 80 f6 98 8b e8 de d4 f6 fe RSP: 0018:ffffc90003176720 EFLAGS: 00010093 RAX: ffffffff8231359b RBX: 0000000000001b88 RCX: ffff8880351f9e40 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200062ecd4 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffc900041b1000 R15: 0000000000000002 FS: 00007feeba18f6c0(0000) GS:ffff8881259c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feeba18ef98 CR3: 0000000077742000 CR4: 00000000003526f0 Call Trace: memcg1_swapout+0x2fa/0x830 mm/memcontrol-v1.c:623 __remove_mapping+0xac5/0xe30 mm/vmscan.c:773 shrink_folio_list+0x2786/0x4f40 mm/vmscan.c:1528 reclaim_folio_list+0xeb/0x4e0 mm/vmscan.c:2208 reclaim_pages+0x454/0x520 mm/vmscan.c:2245 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+0x3132/0x4170 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: 0033:0x7feeb938f749 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:00007feeba18f038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007feeb95e6090 RCX: 00007feeb938f749 RDX: 0000000000000015 RSI: 0000000000800000 RDI: 0000200000000000 RBP: 00007feeb9413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feeb95e6128 R14: 00007feeb95e6090 R15: 00007ffd48399048 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:swap_cgroup_record+0x19c/0x1c0 mm/swap_cgroup.c:78 Code: 02 e9 6d ff ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 35 ff ff ff 4c 89 f7 e8 cf 84 f6 ff e9 28 ff ff ff e8 e5 c1 8f ff 90 <0f> 0b e8 dd c1 8f ff 4c 89 f7 48 c7 c6 80 f6 98 8b e8 de d4 f6 fe RSP: 0018:ffffc90003176720 EFLAGS: 00010093 RAX: ffffffff8231359b RBX: 0000000000001b88 RCX: ffff8880351f9e40 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200062ecd4 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffc900041b1000 R15: 0000000000000002 FS: 00007feeba18f6c0(0000) GS:ffff8881259c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feeba18ef98 CR3: 0000000077742000 CR4: 00000000003526f0 --- 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