From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) (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 B253E41C79 for ; Sat, 13 Jul 2024 12:38:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720874309; cv=none; b=GVUYyBd5AagxNgBqqMXyJFdilfWbKLjIgejEoYbpETwPo/oa2cZXzuxxptN6RnDS/dpbGtocJe1BTfcDIeHpNkH7m5aexS4W+j7TdX43UOv1m5+S8rY1BTzbQuQd1fMyreR4Etga0M6q6HPQ8ZGIyWKPweTHDryikCK0pctmW2c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720874309; c=relaxed/simple; bh=CyBaGJoTD+P6AXcRsXv1NSHzFThYQ6nvyANCOigkDtQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ItzLYFC5JGSLVm9UP4zhsdvQuw9z+rfaK/uvml4ouwlfU6kjU7diHU3oGbOg0qQEaNJHgVlFkJo4+/RQPYvXs62OUAAcshLUqG/ORn4zF6mrhOiMUPIEkU3bxNnfG8AkTX3FokwUz2TN+oYrClSTDo9YAXlp1yL0gv9srzIosRQ= 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=209.85.166.72 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-io1-f72.google.com with SMTP id ca18e2360f4ac-7f684ab3f9cso225321439f.0 for ; Sat, 13 Jul 2024 05:38:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720874307; x=1721479107; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=sbdmrFkaTmpVzzt/gdKNXifzm0BEY4POC6QiUarBLtc=; b=GJ7A8316wBrwtaP86whYCIl5PpTdrnqVM9gHbt8zn49EhPSTtvP52kb3mIF8ZW/vmy rX8zYYoA4h+ocmEpV1giaxR7m3SMANhvbBDik238zSpMqEAIR+UMeeQCxWPuNTnZQJ6Q GBpANAc6LTjC6yfrtk7LhPE+VY67BdbP+aDdE1yp2Wo1IB1brh5oGpSpUTUglPleHZhE TRpmHXSG+WDoUyOAemnqGyTuRXFZGzhnKuGEFMlhPdz1J1e4xLh9Mk6V8cc5oLgH1832 IXO6Xm9c3SgeUs3rtFUKPByb8RWe/EnhNRsnjglDQ7nq+i8YrwDEavN8AaEk3626fQvb OdyQ== X-Forwarded-Encrypted: i=1; AJvYcCWYTLYdQNynq6I6nFXiJjO9v40MVSKY1Iiwn2a4hANhkM3V7oyKbDeMrqc5391KCXS3wiZlXIdkMttiSPrHFJDHdDKFvx58AZboR6Qc X-Gm-Message-State: AOJu0YxFH1TMw3q+/kVhRcIjVwvGFvY4YeCXfXrv7qll10RqQqfoAA/n J/5xF+u2yr1VWXQ2QiJcmweyK1T/Bep0BHwxIL/0mhDpzZ8B0IlOxkaQ+k8dHfZf34B7vDUuE6W IpcovUpIF0gd7Ieuo3gR74evC6WfT+QiyhazQpC8xnKX3Wj6BFwck/lQ= X-Google-Smtp-Source: AGHT+IHJ6RQI6UMUE8vQTdzq4LsVtJ07j4Qwpi1Zv7lL7eFnEJg0rGCZvi1k7ZqcZ5Qu53SrfAyXQfJ4TW0p618azEUuGbHSUbE5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:620d:b0:805:e4ad:66d6 with SMTP id ca18e2360f4ac-80986887221mr27083239f.0.1720874306774; Sat, 13 Jul 2024 05:38:26 -0700 (PDT) Date: Sat, 13 Jul 2024 05:38:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c23a1f061d204564@google.com> Subject: [syzbot] [mm?] general protection fault in khugepaged (3) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 528dd46d0fc3 Merge tag 'net-6.10-rc8-2' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f9d0f1980000 kernel config: https://syzkaller.appspot.com/x/.config?x=38e374b1a3185897 dashboard link: https://syzkaller.appspot.com/bug?extid=33287c327c3bcd4ea552 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/01b3c6d9bec7/disk-528dd46d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7db1f2513396/vmlinux-528dd46d.xz kernel image: https://storage.googleapis.com/syzbot-assets/cfae1c808981/bzImage-528dd46d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+33287c327c3bcd4ea552@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000084: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000420-0x0000000000000427] CPU: 1 PID: 37 Comm: khugepaged Not tainted 6.10.0-rc7-syzkaller-00254-g528dd46d0fc3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2365 [inline] RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2498 [inline] RIP: 0010:khugepaged+0x8ec/0x1820 mm/khugepaged.c:2554 Code: e8 39 6d 9d ff 83 44 24 14 01 e9 9b f8 ff ff e8 2a 6d 9d ff 49 8d 7c 24 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 ad 0d 00 00 49 8d 7c 24 70 49 8b 6c 24 20 48 b9 RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010217 RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88801bae9e00 RSI: ffffffff81f1c0f6 RDI: 0000000000000426 RBP: 0000000028100077 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000406 R13: 0000000000000200 R14: 1ffff9200015afaf R15: 0000000000000007 FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020027000 CR3: 000000006a590000 CR4: 0000000000350ef0 Call Trace: kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:khugepaged_scan_mm_slot mm/khugepaged.c:2365 [inline] RIP: 0010:khugepaged_do_scan mm/khugepaged.c:2498 [inline] RIP: 0010:khugepaged+0x8ec/0x1820 mm/khugepaged.c:2554 Code: e8 39 6d 9d ff 83 44 24 14 01 e9 9b f8 ff ff e8 2a 6d 9d ff 49 8d 7c 24 20 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 ad 0d 00 00 49 8d 7c 24 70 49 8b 6c 24 20 48 b9 RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010217 RAX: 0000000000000084 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88801bae9e00 RSI: ffffffff81f1c0f6 RDI: 0000000000000426 RBP: 0000000028100077 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000406 R13: 0000000000000200 R14: 1ffff9200015afaf R15: 0000000000000007 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2eb1cff8 CR3: 000000001fc08000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: e8 39 6d 9d ff call 0xff9d6d3e 5: 83 44 24 14 01 addl $0x1,0x14(%rsp) a: e9 9b f8 ff ff jmp 0xfffff8aa f: e8 2a 6d 9d ff call 0xff9d6d3e 14: 49 8d 7c 24 20 lea 0x20(%r12),%rdi 19: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 20: fc ff df 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 0f 85 ad 0d 00 00 jne 0xde1 34: 49 8d 7c 24 70 lea 0x70(%r12),%rdi 39: 49 8b 6c 24 20 mov 0x20(%r12),%rbp 3e: 48 rex.W 3f: b9 .byte 0xb9 --- 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 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