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Received: from [172.16.25.169] (185.231.240.5) by AM5PR0801MB2018.eurprd08.prod.outlook.com (2603:10a6:203:4b::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1038.22; Tue, 14 Aug 2018 13:34:25 +0000 Subject: Re: general protection fault in cgroup_reconfigure To: syzbot , akpm@linux-foundation.org, davem@davemloft.net, dhowells@redhat.com, guro@fb.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org References: <0000000000008bc6660570637414@google.com> From: Kirill Tkhai Message-ID: Date: Tue, 14 Aug 2018 16:34:22 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <0000000000008bc6660570637414@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Originating-IP: [185.231.240.5] X-ClientProxiedBy: HE1PR05CA0384.eurprd05.prod.outlook.com (2603:10a6:7:94::43) To 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X-Microsoft-Exchange-Diagnostics: 1;AM5PR0801MB2018;20:125ebWlUJQg6JO4TsfNSAsoG7ZQ/GMFUcXczURnNNLBTvJAfoTnup6J0W2EF5+6kjuGHitliTdqxEUj5pg1aAzz2In2TAVKtrvRmZKlER2yFp5ujImddmq7qUPK9MJ4bK6iQZJSrugjAx/h7Fj75Yw9DIZlm3bdwdqxMDonOLGQ= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2018 13:34:25.7666 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 269af75d-73cf-4593-548f-08d601eaa799 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0801MB2018 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org JFI: Fixed by https://lkml.org/lkml/2018/8/3/351 On 07.07.2018 10:09, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    526674536360 Add linux-next specific files for 20180706 > git tree:       linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=14b51a2c400000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48 > dashboard link: https://syzkaller.appspot.com/bug?extid=d4eb75e353a836d57809 > compiler:       gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=10ce2cc2400000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=149cec58400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+d4eb75e353a836d57809@syzkaller.appspotmail.com > > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > CPU: 1 PID: 4415 Comm: syz-executor204 Not tainted 4.18.0-rc3-next-20180706+ #1 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1781 > Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff > RSP: 0018:ffff8801acc1f9f8 EFLAGS: 00010206 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81c5edb2 > RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090 > RBP: ffff8801acc1fa00 R08: ffff8801ad2e45c0 R09: fffffbfff11c24e5 > R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940 > R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 > FS:  00000000016f3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000000 CR3: 00000001b24ea000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: >  kernfs_sop_reconfigure+0xba/0x100 fs/kernfs/mount.c:31 >  do_remount_sb+0x34f/0x850 fs/super.c:991 >  do_umount fs/namespace.c:1467 [inline] >  ksys_umount+0xfa7/0x12f0 fs/namespace.c:1585 >  __do_sys_umount fs/namespace.c:1596 [inline] >  __se_sys_umount fs/namespace.c:1594 [inline] >  __x64_sys_umount+0x54/0x80 fs/namespace.c:1594 >  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 >  entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x440059 > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007ffe8d0cd578 EFLAGS: 00000217 ORIG_RAX: 00000000000000a6 > RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440059 > RDX: 0000000000440059 RSI: 0000000000000000 RDI: 0000000020000040 > RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 > R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004018e0 > R13: 0000000000401970 R14: 0000000000000000 R15: 0000000000000000 > Modules linked in: > Dumping ftrace buffer: >    (ftrace buffer empty) > ---[ end trace 2c2a1923aa2ae1cb ]--- > RIP: 0010:cgroup_reconfigure+0x25/0x80 kernel/cgroup/cgroup.c:1781 > Code: 00 00 00 00 00 55 48 89 e5 53 48 89 f3 e8 f3 e9 08 00 48 8d bb 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 45 48 8b 9b 90 00 00 00 48 b8 00 00 00 00 00 fc ff > RSP: 0018:ffff8801acc1f9f8 EFLAGS: 00010206 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81c5edb2 > RDX: 0000000000000012 RSI: ffffffff8173906d RDI: 0000000000000090 > RBP: ffff8801acc1fa00 R08: ffff8801ad2e45c0 R09: fffffbfff11c24e5 > R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801d9a14940 > R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 > FS:  00000000016f3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000000 CR3: 00000001b24ea000 CR4: 00000000001406e0 > 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. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches