From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37412C43387 for ; Wed, 2 Jan 2019 11:36:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3733218D3 for ; Wed, 2 Jan 2019 11:36:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729668AbfABLgF (ORCPT ); Wed, 2 Jan 2019 06:36:05 -0500 Received: from mail-it1-f199.google.com ([209.85.166.199]:55428 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727631AbfABLgF (ORCPT ); Wed, 2 Jan 2019 06:36:05 -0500 Received: by mail-it1-f199.google.com with SMTP id j3so32886649itf.5 for ; Wed, 02 Jan 2019 03:36:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=MXmDgYnD5vhY7VnxcK+lvh/RF8zEPtKYkgL8Hy7d2SY=; b=KIl3gTVxftvV6uIUz39HpAaVc6mASnUiIvSFh6vrDLmC3nn/7UwcjE7JgQqe/us/Xb uMseG0YhM4apvph+b1/16NIyKc8zCHUbyUNuDbzoxmjIq0FZ0bH3/7Xz7/0BiJ7To1gJ vgmtkhvIBybpIBfC6XA3LcoS9ezO48bPVj9RoZ3o3TbqYBj8y+LlAtyEwaBidoxPnUuW fWuY9TRzLToyR+9zw60ec6+EbTID0APNfyTMCDAzzaqjziRFK2+kLnaTOUpaGvCGtpax MNbEQUjoGnaa9DuBULQLQpvc+gC4kPMKEBFPg4CG7OcUVaUeDB625jnGwI/0kfwwkulS m2Kw== X-Gm-Message-State: AA+aEWb3JjbdDllSMRh+OSypSuzP0AG+BNDBTLTE5yIojOhkfSGQJbi1 0tdtkInRU9IcwurYYZHJmZFW4/BTJ7Kvmyk13pmNzCiASIXS X-Google-Smtp-Source: AFSGD/XKqc/lFvwDRWTIKTOnm6GUn9cxDWUTyt+Y6TIZlBN8tStNCftIo4LEcAcMqVWUp1Zxc3QyUZOw+VT3NqFchXnG+MgHKBgo MIME-Version: 1.0 X-Received: by 2002:a24:e4cf:: with SMTP id o198mr31968201ith.20.1546428963826; Wed, 02 Jan 2019 03:36:03 -0800 (PST) Date: Wed, 02 Jan 2019 03:36:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000f35c6057e780d36@google.com> Subject: BUG: unable to handle kernel NULL pointer dereference in setup_kmem_cache_node From: syzbot To: asmadeus@codewreck.org, davem@davemloft.net, ericvh@gmail.com, linux-kernel@vger.kernel.org, lucho@ionkov.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, v9fs-developer@lists.sourceforge.net Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 903b77c63167 Merge tag 'linux-kselftest-4.21-rc1' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=133428e3400000 kernel config: https://syzkaller.appspot.com/x/.config?x=53a2f2aa0b1f7606 dashboard link: https://syzkaller.appspot.com/bug?extid=d6ed4ec679652b4fd4e4 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d6ed4ec679652b4fd4e4@syzkaller.appspotmail.com BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 #PF error: [WRITE] PGD 8b2a5067 P4D 8b2a5067 PUD a53ed067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 16188 Comm: syz-executor4 Not tainted 4.20.0+ #174 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:init_arraycache mm/slab.c:562 [inline] RIP: 0010:__alloc_alien_cache mm/slab.c:669 [inline] RIP: 0010:alloc_alien_cache mm/slab.c:689 [inline] RIP: 0010:setup_kmem_cache_node+0x1ed/0x400 mm/slab.c:910 Code: 63 48 63 c3 48 0f a3 05 59 9c 72 08 73 56 8b 75 b8 4d 8d 2c c6 44 89 e2 48 8b 7d a8 e8 fc e9 ff ff 48 83 f8 c8 49 89 c7 74 17 40 38 00 00 00 00 8b 45 b0 41 89 47 3c b8 0d f0 ad ba 49 89 47 RSP: 0018:ffff88804e827318 EFLAGS: 00010213 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000006000c0 RDX: 00000000000000a8 RSI: 0000000000000000 RDI: ffff88812c3f0040 RBP: ffff88804e827378 R08: ffff888054cc86c0 R09: ffffed1015ce5b8f R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: 0000000000000000 R13: ffff888095642648 R14: ffff888095642640 R15: 0000000000000000 FS: 00007f6fef838700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 000000005034d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: setup_kmem_cache_nodes mm/slab.c:3819 [inline] __do_tune_cpucache+0x165/0x220 mm/slab.c:3889 do_tune_cpucache+0x25/0xd0 mm/slab.c:3898 enable_cpucache+0x3e/0xd0 mm/slab.c:3979 setup_cpu_cache+0xd4/0x1e0 mm/slab.c:1821 __kmem_cache_create+0x191/0x230 mm/slab.c:2134 create_cache+0xcd/0x1f0 mm/slab_common.c:391 kmem_cache_create_usercopy+0x18a/0x240 mm/slab_common.c:487 p9_client_create+0x986/0x1674 net/9p/client.c:1054 v9fs_session_init+0x217/0x1bb0 fs/9p/v9fs.c:421 v9fs_mount+0x7c/0x8f0 fs/9p/vfs_super.c:135 mount_fs+0xae/0x31d fs/super.c:1261 kobject: 'loop1' (000000003afcedd0): kobject_uevent_env vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 kobject: 'loop1' (000000003afcedd0): fill_kobj_path: path = '/devices/virtual/block/loop1' vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2801 kobject: 'loop2' (00000000108c69f3): kobject_uevent_env kobject: 'loop2' (00000000108c69f3): fill_kobj_path: path = '/devices/virtual/block/loop2' ksys_mount+0x12d/0x140 fs/namespace.c:3017 __do_sys_mount fs/namespace.c:3031 [inline] __se_sys_mount fs/namespace.c:3028 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3028 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6fef837c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6fef837c90 RCX: 00000000004579b9 RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 000000000073bf00 R08: 0000000020000240 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6fef8386d4 R13: 00000000004c369b R14: 00000000004d61f8 R15: 0000000000000005 Modules linked in: CR2: 0000000000000038 ---[ end trace c630b12329ae5f74 ]--- RIP: 0010:init_arraycache mm/slab.c:562 [inline] RIP: 0010:__alloc_alien_cache mm/slab.c:669 [inline] RIP: 0010:alloc_alien_cache mm/slab.c:689 [inline] RIP: 0010:setup_kmem_cache_node+0x1ed/0x400 mm/slab.c:910 kobject: 'loop3' (00000000e06f18ba): kobject_uevent_env Code: 63 48 63 c3 48 0f a3 05 59 9c 72 08 73 56 8b 75 b8 4d 8d 2c c6 44 89 e2 48 8b 7d a8 e8 fc e9 ff ff 48 83 f8 c8 49 89 c7 74 17 40 38 00 00 00 00 8b 45 b0 41 89 47 3c b8 0d f0 ad ba 49 89 47 kobject: 'loop3' (00000000e06f18ba): fill_kobj_path: path = '/devices/virtual/block/loop3' RSP: 0018:ffff88804e827318 EFLAGS: 00010213 kobject: 'loop5' (00000000bc6ae381): kobject_uevent_env RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000006000c0 kobject: 'loop5' (00000000bc6ae381): fill_kobj_path: path = '/devices/virtual/block/loop5' RDX: 00000000000000a8 RSI: 0000000000000000 RDI: ffff88812c3f0040 kobject: 'loop3' (00000000e06f18ba): kobject_uevent_env kobject: 'loop3' (00000000e06f18ba): fill_kobj_path: path = '/devices/virtual/block/loop3' RBP: ffff88804e827378 R08: ffff888054cc86c0 R09: ffffed1015ce5b8f kobject: 'loop1' (000000003afcedd0): kobject_uevent_env R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: 0000000000000000 kobject: 'loop1' (000000003afcedd0): fill_kobj_path: path = '/devices/virtual/block/loop1' R13: ffff888095642648 R14: ffff888095642640 R15: 0000000000000000 FS: 00007f6fef838700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000400200 CR3: 000000005034d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.