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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 8 Jul 2019 20:16:07 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x68JFrWP35520950 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 8 Jul 2019 19:15:53 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A4A224C04E; Mon, 8 Jul 2019 19:16:05 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9B5754C046; Mon, 8 Jul 2019 19:16:04 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.159.148]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 8 Jul 2019 19:16:04 +0000 (GMT) Subject: Re: linux-next: Tree for Jul 8 --> bootup failure on s390x (bisected) To: Al Viro Cc: Stephen Rothwell , Linux Next Mailing List , Linux Kernel Mailing List , Heiko Carstens , Vasily Gorbik , markward@linux.ibm.com, linux-s390 References: <20190708224238.60bd0aff@canb.auug.org.au> <0be7464d-f8ed-0567-b0ff-a6d31ecfd7a8@de.ibm.com> <20190708180657.GV17978@ZenIV.linux.org.uk> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190708180657.GV17978@ZenIV.linux.org.uk> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19070819-4275-0000-0000-0000034A49F5 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19070819-4276-0000-0000-0000385A7244 Message-Id: <90645322-01ca-248c-b53d-9bb103223d1b@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-08_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=979 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907080238 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08.07.19 20:06, Al Viro wrote: > On Mon, Jul 08, 2019 at 06:52:14PM +0200, Christian Borntraeger wrote: > >> smp: Brought up 1 node, 1 CPU >> Unable to handle kernel pointer dereference in virtual kernel address space >> Failing address: 000000003a070000 TEID: 000000003a070407 >> Fault in home space mode while using kernel ASCE. >> AS:000000003a780007 R3:000000007ffd0007 S:000000007ffd4800 P:000000003a07021d >> Oops: 0004 ilc:2 [#1] SMP >> Modules linked in: >> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc5-00101-gcb8f0b366109 #14 >> Hardware name: IBM 2964 NC9 712 (KVM/Linux) >> Krnl PSW : 0704e00180000000 000000003974b580 (shmem_parse_monolithic+0x88/0x100) >> R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 >> Krnl GPRS: 0000000000000000 000000000000003d 000000003a07040e 000000000000003d >> 000000003a07040f 000000000000006d 0000000000000001 0000000000000000 >> 000000007f7c1c00 0000000000000000 000000003a07040a 0000000000000000 >> 000000007f7e4000 000000003a190d78 000000003974b56c 000003e00031fd38 >> Krnl Code: 000000003974b574: b920002a cgr %r2,%r10 >> 000000003974b578: a784001b brc 8,3974b5ae >> #000000003974b57c: 41402001 la %r4,1(%r2) >> >000000003974b580: 92002000 mvi 0(%r2),0 >> 000000003974b584: a7090000 lghi %r0,0 >> 000000003974b588: b9040014 lgr %r1,%r4 >> 000000003974b58c: b25e0001 srst %r0,%r1 >> 000000003974b590: a714fffe brc 1,3974b58c >> Call Trace: >> ([<000003e00031fd80>] 0x3e00031fd80) >> [<0000000039811662>] vfs_kern_mount.part.0+0x9a/0xc8 >> [<000000003a302fc0>] devtmpfs_init+0x38/0x140 >> [<000000003a302e0a>] driver_init+0x22/0x60 >> [<000000003a2beff8>] kernel_init_freeable+0x298/0x4f0 >> [<0000000039e7b53a>] kernel_init+0x22/0x148 >> [<0000000039e87b70>] ret_from_fork+0x30/0x34 >> [<0000000039e87b74>] kernel_thread_starter+0x0/0xc >> INFO: lockdep is turned off. >> [...] > > Oh, fuck... OK, I understand what's going on; sorry, my fault. Could you > verify that the following helps? Yes, it does. > > diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c > index 52312c665a38..30d0523014e0 100644 > --- a/drivers/base/devtmpfs.c > +++ b/drivers/base/devtmpfs.c > @@ -431,9 +431,10 @@ static int devtmpfsd(void *p) > */ > int __init devtmpfs_init(void) > { > + char opts[] = "mode=0755"; > int err; > > - mnt = vfs_kern_mount(&internal_fs_type, 0, "devtmpfs", "mode=0755"); > + mnt = vfs_kern_mount(&internal_fs_type, 0, "devtmpfs", opts); > if (IS_ERR(mnt)) { > printk(KERN_ERR "devtmpfs: unable to create devtmpfs %ld\n", > PTR_ERR(mnt)); >