From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FB481F92E for ; Sun, 25 Jan 2026 02:23:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769307811; cv=none; b=lY0JrCXhXriEGJXc6LhatrJ097pkt8AOq7yO6M4pD7pOfP3+6eC3xG+aAqDPCWmMmZs4RGUSS5UJbqPqDOL2SGPHpPI1ICyZAVKgXkGLOcnGp72LPCxnNQWS6m1EufVCbIyqCj0H0LRdmRTL5koAW50epfG1o6DA9XHP6NvxYDs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769307811; c=relaxed/simple; bh=mQqtYzZcuL26AhnJUo5vDmSM1iJfMjwRj5TKvYIUkRI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=dQzGIe1E1cnHm7c1ajkXMl6kIgckoFpK/QqV3A7SFD5jhjM79bVk9b+jIaISwjssYyk+vy7nyOjBSaqrV9LO6jqX+tmoNvNkMKaveb9GqLqYh8CMXDrUq++lkLwNIYv3SMhB4NyUfJbkr/6bvFlUXe3wdK6pil4kF9G96Ra6G/0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f78.google.com with SMTP id 006d021491bc7-662b5df7a2bso4847622eaf.2 for ; Sat, 24 Jan 2026 18:23:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769307809; x=1769912609; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=At1cEBr3ulEVWtp6VYDeLHEdLnVmvNt/QgU1kB8+sZw=; b=l/6iwh4TQXGPfjP11KUPE/aEAP2lvFPV9iECyn4eGhCvN6stRJa1eZJh52V+XAnsH7 7veJBlcme/IMWx2BrdaUEJ8PG8P8osTxP6EdgeLNJJ4/KCglFZt0zzQEDTAZhvAN6T3F u6+om0Rez1/3M6nZtym4Z/T4V6MxX7EHm8lgsHZ5FHCixuhNKBCHfNK8hUSlVxgzIDst 3dtjDGwOzDk0gzm3PQkowgPY5EaloPBvfnX+hwmGtZfjohXrhZE/T1RFzNGm3nPEFdSS lZJqrHIh035yx8atI3FfbOpJHAC9QT9+YYa9sCPV3WuRIYq8UhdzFUx0qBjjL7ERzJ0Y oP8w== X-Forwarded-Encrypted: i=1; AJvYcCW9rPmO9OpcPZqWqi2H20oALYfQilKhSC39EyEsGD6DBdi9HlNH2KjeCOgAEf3UlNnPBorvTiHoVcbFGRs=@vger.kernel.org X-Gm-Message-State: AOJu0YyDK1DchqckGmYR883pgpzk3xkXvkxV+c//jA2qEbebwqxPFMHr jFOIteJLXJu2OdUlsyih12D45IdogcizgMM1JFFb91F8xamv6RPokkf5evEnwsaJqsEn9qP9cy3 xRlEDVbRWJQaxWY1/L/Rw6yKIUg6WW6tIhUT2mGVKEXv1qg7+UokMlaCUmvk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:460b:b0:65f:1038:1312 with SMTP id 006d021491bc7-662e03e4d0bmr226806eaf.24.1769307808980; Sat, 24 Jan 2026 18:23:28 -0800 (PST) Date: Sat, 24 Jan 2026 18:23:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69757ea0.a00a0220.33ccc7.0017.GAE@google.com> Subject: [syzbot] [mm?] kernel BUG in hpage_collapse_scan_file (2) From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, lance.yang@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ca3a02fda4da Add linux-next specific files for 20260123 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10c42452580000 kernel config: https://syzkaller.appspot.com/x/.config?x=10f2b64f8f12b9a4 dashboard link: https://syzkaller.appspot.com/bug?extid=bf6e6a6ca143afea5ca2 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f7cbfa580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112d405a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/291ebca63a31/disk-ca3a02fd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b2112a214b54/vmlinux-ca3a02fd.xz kernel image: https://storage.googleapis.com/syzbot-assets/77d1ae437e07/bzImage-ca3a02fd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bf6e6a6ca143afea5ca2@syzkaller.appspotmail.com node ffff888148816ec0 offset 0 parent ffff888148817700 shift 0 count 64 values 0 array ffff88807be6b0f0 list ffff888148816ed8 ffff888148816ed8 marks 0 0 0 ------------[ cut here ]------------ kernel BUG at ./include/linux/xarray.h:1441! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6017 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:XAS_INVALID include/linux/xarray.h:1441 [inline] RIP: 0010:collapse_file mm/khugepaged.c:2041 [inline] RIP: 0010:hpage_collapse_scan_file+0x4e0c/0x50e0 mm/khugepaged.c:2387 Code: ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 ee 6c f6 fe 90 0f 0b 48 85 db 0f 84 29 01 00 00 e8 bd 34 91 ff 48 89 df e8 f5 c4 4b 09 90 <0f> 0b e8 ad 34 91 ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 be 6c f6 fe RSP: 0018:ffffc9000422f120 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888148816ec0 RCX: 6c90c8cc739bf400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000422f428 R08: ffffc9000422eea7 R09: 1ffff92000845dd4 R10: dffffc0000000000 R11: fffff52000845dd5 R12: 00000003fffffffc R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555592982500(0000) GS:ffff8881256ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 0000000031994000 CR4: 00000000003526f0 Call Trace: madvise_collapse+0x42f/0xb30 mm/khugepaged.c:2817 madvise_vma_behavior+0x10ad/0x43f0 mm/madvise.c:1372 madvise_walk_vmas+0x57a/0xaf0 mm/madvise.c:1721 madvise_do_behavior+0x386/0x540 mm/madvise.c:1937 do_madvise+0x1fa/0x2e0 mm/madvise.c:2030 __do_sys_madvise mm/madvise.c:2039 [inline] __se_sys_madvise mm/madvise.c:2037 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2037 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f948ad9acb9 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:00007ffd1ef477c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f948b015fa0 RCX: 00007f948ad9acb9 RDX: 0000000000000019 RSI: 0000000000600003 RDI: 0000200000000000 RBP: 00007f948ae08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f948b015fac R14: 00007f948b015fa0 R15: 00007f948b015fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:XAS_INVALID include/linux/xarray.h:1441 [inline] RIP: 0010:collapse_file mm/khugepaged.c:2041 [inline] RIP: 0010:hpage_collapse_scan_file+0x4e0c/0x50e0 mm/khugepaged.c:2387 Code: ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 ee 6c f6 fe 90 0f 0b 48 85 db 0f 84 29 01 00 00 e8 bd 34 91 ff 48 89 df e8 f5 c4 4b 09 90 <0f> 0b e8 ad 34 91 ff 48 89 df 48 c7 c6 c0 8c bc 8b e8 be 6c f6 fe RSP: 0018:ffffc9000422f120 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888148816ec0 RCX: 6c90c8cc739bf400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000422f428 R08: ffffc9000422eea7 R09: 1ffff92000845dd4 R10: dffffc0000000000 R11: fffff52000845dd5 R12: 00000003fffffffc R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555592982500(0000) GS:ffff8881256ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0001002a0 CR3: 0000000031994000 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