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AJvYcCWl1fsZBZycbgvD6aDTXBiCPCjJSsFD7rXrehRnw2NsG7QaeVHLiuNiIFe0xZiQjHErmN72KymbteeqSbs=@vger.kernel.org X-Gm-Message-State: AOJu0YwUyRRWt/Xq25DLw16ffd0H3T3xeKtOi7F71NRjkW/OUG5kV+Dp HtmxIOkREWuFAJHl1NbYxfyEG67n8ADORTH6vq5KnUI7+WhoxzJfmEUpPviRyU9VTwZYDr7T16d 8ujngQdspTAo05d9MuDf0sLkmpdzOsNKU/IMoysSivxLOEw+5dG7rWkQLGF8= X-Google-Smtp-Source: AGHT+IElRoPmko4DHMz+XHH+ek3B6AjwdKW6RYAyBQpaMcPkVbnq94aa24U9J7DoM3G2XMQ9/nFQWU5DejqEck1aHuiHAP8yV+fp Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:b1ca:0:b0:65f:572b:c489 with SMTP id 006d021491bc7-65f572bc4fdmr4768742eaf.17.1767978482196; Fri, 09 Jan 2026 09:08:02 -0800 (PST) Date: Fri, 09 Jan 2026 09:08:02 -0800 In-Reply-To: <20260109162319.596850-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <696135f2.050a0220.1c677c.03d0.GAE@google.com> Subject: Re: [syzbot] [mm?] [cgroups?] kernel BUG in swap_cgroup_record (2) From: syzbot To: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: vmalloc-out-of-bounds Read in swap_cgroup_lookup ================================================================== BUG: KASAN: vmalloc-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: vmalloc-out-of-bounds in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: vmalloc-out-of-bounds in swap_cgroup_lookup+0x89/0xd0 mm/swap_cgroup.c:67 Read of size 4 at addr ffffc900034e0800 by task syz.0.17/6463 CPU: 0 UID: 0 PID: 6463 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] swap_cgroup_lookup+0x89/0xd0 mm/swap_cgroup.c:67 memcg1_swapout+0x235/0x8c0 mm/memcontrol-v1.c:634 __remove_mapping+0xac5/0xe30 mm/vmscan.c:764 shrink_folio_list+0x28a8/0x5200 mm/vmscan.c:1523 reclaim_folio_list+0xeb/0x4e0 mm/vmscan.c:2203 reclaim_pages+0x454/0x520 mm/vmscan.c:2240 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: 0033:0x7f6b0fb8f749 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:00007f6b10aca038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f6b0fde6090 RCX: 00007f6b0fb8f749 RDX: 0000000000000015 RSI: 0000000000800000 RDI: 0000200000000000 RBP: 00007f6b0fc13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6b0fde6128 R14: 00007f6b0fde6090 R15: 00007ffcdb080178 The buggy address belongs to a vmalloc virtual mapping Memory state around the buggy address: ffffc900034e0700: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900034e0780: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc900034e0800: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc900034e0880: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900034e0900: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== Tested on: commit: f417b7ff Add linux-next specific files for 20260109 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=138f919a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9abcd50d16f3c8b5 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 patch: https://syzkaller.appspot.com/x/patch.diff?x=15dab19a580000