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Fri, 17 Jul 2020 21:23:24 +0000 From: Vidhesh Ramesh To: Steve French CC: Kenneth Dsouza , CIFS Subject: Re: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elrepo.x86_64 Thread-Topic: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elrepo.x86_64 Thread-Index: AQHWSq9edtCo81aaX06K8scfXoPZ86jz61slgBOCXOSAAAa8h4AAAm8AgAACGQCABCW3fYAAUneAgAB5rTg= Date: Fri, 17 Jul 2020 21:23:23 +0000 Message-ID: References: , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=komprise.com; x-originating-ip: [24.5.193.179] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 800a02e5-a873-4dc3-571d-08d82a97a354 x-ms-traffictypediagnostic: BYAPR16MB3959: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: KZxv//aWwKLrkES/LbwcfCqlpMbB/TCzl9HHbpXBPO/7gs7ID9UMwBU3vFN4ngUtlXJ75DfEYAtzlmCyoRB0XmNZv2rQ3mlvaFb1AJkT3Mr4BnOESIOWjn+Z0ZgvtQaDTTa4NBhY5oQX0xWvAXHtzvYs2yYrHEfQdZDHlsAOfMB1z0opKpCX6bWtO7DloxYfoNnMv5nbmI7iwZkBFy2i3wuohMYIVxUrWsWaQe+cYRSJMJ64eAObByaOvfuETAKldd8VRBbsKHsumqDR26ZnyXzawDAtNhQXg2AnxBhZ1/Otss9EdIh6AAs0Fe2iKPPbtlaZjv03B814nZJW18z9QYV19w638vlpsHrcq3iHRNtObzNPhUqz9B2bcYrdf5pWiKshjY1zY7ZKM6hR7PidgQ== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR16MB2615.namprd16.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(376002)(346002)(39850400004)(396003)(366004)(136003)(55016002)(91956017)(4326008)(76116006)(316002)(8676002)(45080400002)(966005)(8936002)(478600001)(54906003)(9686003)(66946007)(64756008)(66556008)(66476007)(66446008)(6916009)(71200400001)(2906002)(6506007)(26005)(186003)(52536014)(44832011)(5660300002)(86362001)(33656002)(53546011)(7696005)(83380400001)(15974865002);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata: P3bcNHqqnlq41Ma5CLCBy0dh1lJhLVH1h4K7kAZldcgs42oxt9YNtsG7AK4SuZykykxvpFN4tqepqRENGmFVsfcTHmwOdO0QydmLC8Ef0Z8fesGe5tjXkMK5IgpZ4yxjSnj7AVRLX+og4vJSl9pbSIgtLi1AnmWSLTKuKNWYNsc2gQ+u0v/BdwrsjYRvXOMP/7HWrZTiFKrkqkaN4VePuGpFIHvujjlGSZT4R1J2HOS0ZwI+D8XDQPY9J1WpuuMcu6aFz4ygZLf5TxnN65iE7xzb8O7o7+4fhfZteHVnfoFDSdjfyrdWZf+/3dVemoJSC1qCR2+qBBreBQ1i1R8goHkWbXlD6iIoM0vGptGov3O+Lxoc6kDAt2ZdCOqA6vpoGN7LnoatswTdEoIu84QZbiE/uI707O/ra8/WdY6jfCUElIVoNt4z/FSQwP+hPgJd/CRjA9CyQmaCe9LNMQA/zug81La6i2LplwTzRgrMQzA= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: komprise.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR16MB2615.namprd16.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 800a02e5-a873-4dc3-571d-08d82a97a354 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Jul 2020 21:23:23.8118 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 7a5a9d78-0afb-4c20-b729-756d332680db X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 5ZEC2k4TWvMv+eQZ7gEFMqrKYFu+RsEe67ptWvh9ny/JL9EaErPpGpHCl4oJ/9Hk+SmozIJzWUnx8SI4LtUx65RDKN+ziFaXCJH+EAQSdpI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR16MB3959 Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Thanks Steve. =0A= We have few more bug fixes that we need in 4.19 LT kernel. However I am una= ble to get a built kernel RPM of latest build 133 of kernel 4.19.=0A= The latest I could get is build 113 of kernel 4.19 at=A0https://buildlogs.c= entos.org/c7-kernels.x86_64/kernel/20200330213326/4.19.113-300.el8.x86_64/k= ernel-4.19.113-300.el7.x86_64.rpm=0A= =0A= Vidhesh Ramesh=0A= =0A= From: Steve French =0A= Sent: Friday, July 17, 2020 7:05 AM=0A= To: Vidhesh Ramesh =0A= Cc: Kenneth Dsouza ; CIFS = =0A= Subject: Re: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elrepo.= x86_64 =0A= =A0=0A= I am not familiar with your distro but a Google search matched on this as a= more recent kernel rpm download with similar sounding name http://lists.el= repo.org/pipermail/elrepo/2018-May/004282.html =0A= =0A= But there should be more recent kernels than that are eg based on newer 4.6= .18 stable branch https://git.kernel.org/pub/scm/linux/kernel/git/stable/li= nux.git/log/?h=3Dlinux-4.16.y=0A= =0A= On Fri, Jul 17, 2020, 04:12 Vidhesh Ramesh wr= ote:=0A= Thanks Steve and Kenneth for your responses.=0A= =0A= I did look at the commits and found that this has been fixed in a patch of = 4.19. Is there an archive where I can download latest 4.19 kernel rpm so th= at I can verify the fix ?=A0=0A= =0A= Vidhesh Ramesh=0A= =0A= =0A= =0A= =0A= =0A= =0A= From: Steve French =0A= Sent: Tuesday, July 14, 2020 10:49 AM=0A= To: Kenneth Dsouza =0A= Cc: Vidhesh Ramesh ; linux-cifs@vger.kernel.or= g =0A= Subject: Re: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elrepo.= x86_64 =0A= =A0=0A= If you have a particular stable kernel used for your distro you can=0A= email stable@vger.kernel.org with the commit id and version you want=0A= it backported for.=0A= =0A= On Tue, Jul 14, 2020 at 12:43 PM Kenneth Dsouza wrote:= =0A= >=0A= > You are hitting a known bug which has been fixed by below patch and is=0A= > part of v5.6 and above.=0A= >=0A= > commit fe1292686333d1dadaf84091f585ee903b9ddb84=0A= > Author: Ronnie Sahlberg =0A= > Date:=A0=A0 Wed Jan 22 11:07:56 2020 +1000=0A= >=0A= >=A0=A0=A0=A0 cifs: fix NULL dereference in match_prepath=0A= >=0A= >=A0=A0=A0=A0 RHBZ: 1760879=0A= >=0A= >=A0=A0=A0=A0 Fix an oops in match_prepath() by making sure that the prepat= h string is not=0A= >=A0=A0=A0=A0 NULL before we pass it into strcmp().=0A= >=0A= >=A0=A0=A0=A0 This is similar to other checks we make for example in cifs_r= oot_iget()=0A= >=0A= >=A0=A0=A0=A0 Signed-off-by: Ronnie Sahlberg =0A= >=A0=A0=A0=A0 Signed-off-by: Steve French =0A= >=0A= > On Tue, Jul 14, 2020 at 11:05 PM Vidhesh Ramesh=0A= > wrote:=0A= > >=0A= > > Adding linux-cifs mailing list.=0A= > >=0A= > > Vidhesh Ramesh=0A= > >=0A= > >=0A= > > From: Vidhesh Ramesh =0A= > > Sent: Tuesday, July 14, 2020 10:18 AM=0A= > > To: Steve French ; linux-cifs@vger.kernel.org ; samba-technical@lists.samba.org =0A= > > Cc: Ameya Usgaonkar =0A= > > Subject: Re: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elr= epo.x86_64=0A= > >=0A= > > Hi Steve et all,=0A= > >=0A= > > Resending this as a gentle reminder if anyone got a chance to look at t= he below mentioned oops kernel panic.=0A= > >=0A= > >=0A= > > Vidhesh Ramesh=0A= > >=0A= > >=0A= > > From: Vidhesh Ramesh =0A= > > Sent: Thursday, July 2, 2020 12:21 AM=0A= > > To: Steve French ; linux-cifs@vger.kernel.org ; samba-technical@lists.samba.org =0A= > > Cc: Ameya Usgaonkar =0A= > > Subject: Re: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elr= epo.x86_64=0A= > >=0A= > > Hi Steve et all,=0A= > >=0A= > > Resending this as a gentle reminder if anyone got a chance to look at t= he below mentioned oops kernel panic.=0A= > >=0A= > > Vidhesh Ramesh=0A= > >=0A= > >=0A= > >=0A= > >=0A= > >=0A= > >=0A= > >=0A= > > From: Ameya Usgaonkar =0A= > > Sent: Wednesday, June 24, 2020 10:26 PM=0A= > > To: Steve French ; linux-cifs@vger.kernel.org ; samba-technical@lists.samba.org =0A= > > Cc: Vidhesh Ramesh =0A= > > Subject: Oops in cifs_match_super() - linux kernel 4.16.2-1.el7.elrepo.= x86_64=0A= > >=0A= > > Hi Steve et al,=0A= > >=A0=A0=A0 My name is Ameya and I work for www.komprise.com.=A0 The linux= kernel with above mentioned version has been panicing, though randomly, bu= t the stack trace appears is consistent.=A0 You can find more details in th= e attachments.=A0 Below is the brief description of the problem -=0A= > >=0A= > > [1.] One line summary of the problem:=0A= > > oops kernel panic=0A= > > [2.] Full description of the problem/report:=0A= > > ESX VM hangs with a kernel panic when cifs shares are mounted. Unable t= o ssh to the VM and the console of the VM is also not responding. With kdum= p service running and core collected the VM restarts successfully.=0A= > > [3.] Keywords (i.e., modules, networking, kernel):=0A= > > cifs, kernel, panic, strcmp, mount=0A= > > [4.] Kernel information=0A= > > [4.1.] Kernel version (from /proc/version):=0A= > > Linux version 4.16.2-1.el7.elrepo.x86_64 (mockbuild@Build64R7) (gcc ver= sion 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC)) #1 SMP Thu Apr 12 09:08:05 ED= T 2018=0A= > > [4.2.] Kernel .config file:=0A= > > Please check the file uploaded=0A= > > [5.] Most recent kernel version which did not have the bug:=0A= > > [6.] Output of Oops.. message (if applicable) with symbolic information= =0A= > >=A0=A0=A0=A0=A0 resolved (see Documentation/admin-guide/oops-tracing.rst= )=0A= > > [442282.069937] BUG: unable to handle kernel NULL pointer dereference a= t 0000000000000000=0A= > > [442282.071474] IP: strcmp+0xe/0x30=0A= > > [442282.072892] PGD 0 P4D 0=0A= > > [442282.074196] Oops: 0000 [#1] SMP PTI=0A= > > [442282.075561] Modules linked in: binfmt_misc fuse cmac rpcsec_gss_krb= 5 nfsv4 arc4 md4 nls_utf8 cifs ccm dns_resolver nfsv3 nfs fscache nf_conntr= ack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ipt_REJECT nf_rej= ect_ipv4 ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_n= at ebtable_broute ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6= ip6table_mangle ip6table_security ip6table_raw iptable_nat nf_conntrack_ip= v4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_se= curity iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iptab= le_filter vmw_vsock_vmci_transport vsock sb_edac crct10dif_pclmul crc32_pcl= mul ghash_clmulni_intel pcbc ppdev aesni_intel vmw_balloon crypto_simd glue= _helper cryptd sg intel_rapl_perf input_leds pcspkr joydev shpchp=0A= > > [442282.090386]=A0 parport_pc parport i2c_piix4 vmw_vmci nfsd nfs_acl l= ockd auth_rpcgss grace sunrpc ip_tables xfs libcrc32c sr_mod cdrom ata_gene= ric sd_mod pata_acpi crc32c_intel serio_raw vmwgfx drm_kms_helper syscopyar= ea sysfillrect sysimgblt fb_sys_fops ttm mptspi scsi_transport_spi ata_piix= mptscsih vmxnet3 drm mptbase libata floppy dm_mirror dm_region_hash dm_log= dm_mod dax=0A= > > [442282.095332] CPU: 4 PID: 9273 Comm: mount.cifs Tainted: G=A0=A0=A0= =A0=A0=A0=A0 W=A0=A0=A0=A0=A0=A0=A0 4.16.2-1.el7.elrepo.x86_64 #1=0A= > > [442282.097802] Hardware name: VMware, Inc. VMware Virtual Platform/440= BX Desktop Reference Platform, BIOS 6.00 04/05/2016=0A= > > [442282.100363] RIP: 0010:strcmp+0xe/0x30=0A= > > [442282.101645] RSP: 0018:ffffc9001bff7c88 EFLAGS: 00010202=0A= > > [442282.102919] RAX: 0000000000000001 RBX: ffff8802ad7c2400 RCX: 000000= 0001240404=0A= > > [442282.104207] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000000= 0000000001=0A= > > [442282.105497] RBP: ffffc9001bff7c88 R08: 0000000001240404 R09: 000000= 0000000001=0A= > > [442282.106765] R10: ffff88017d2c2b40 R11: ffff8801744c0e50 R12: ffff88= 011f793000=0A= > > [442282.108038] R13: ffff88042b105800 R14: ffffc9001bff7d98 R15: ffff88= 01b63c0f00=0A= > > [442282.109318] FS:=A0 00007f3e90ee6780(0000) GS:ffff88043fd00000(0000)= knlGS:0000000000000000=0A= > > [442282.110630] CS:=A0 0010 DS: 0000 ES: 0000 CR0: 0000000080050033=0A= > > [442282.111970] CR2: 0000000000000000 CR3: 000000011b2ea000 CR4: 000000= 00000406e0=0A= > > [442282.113405] Call Trace:=0A= > > [442282.114849]=A0 cifs_match_super+0x123/0x210 [cifs]=0A= > > [442282.116211]=A0 ? cifs_prune_tlinks+0xe0/0xe0 [cifs]=0A= > > [442282.117541]=A0 sget_userns+0x88/0x4a0=0A= > > [442282.118877]=A0 ? cifs_kill_sb+0x30/0x30 [cifs]=0A= > > [442282.120203]=A0 ? cifs_prune_tlinks+0xe0/0xe0 [cifs]=0A= > > [442282.121502]=A0 sget+0x7d/0xa0=0A= > > [442282.122781]=A0 ? cifs_kill_sb+0x30/0x30 [cifs]=0A= > > [442282.124072]=A0 cifs_do_mount+0x168/0x5a0 [cifs]=0A= > > [442282.125364]=A0 mount_fs+0x3e/0x150=0A= > > [442282.126627]=A0 vfs_kern_mount+0x67/0x130=0A= > > [442282.127850]=A0 do_mount+0x1f5/0xca0=0A= > > [442282.129047]=A0 SyS_mount+0x83/0xd0=0A= > > [442282.130257]=A0 do_syscall_64+0x79/0x1b0=0A= > > [442282.131583]=A0 entry_SYSCALL_64_after_hwframe+0x3d/0xa2=0A= > > [442282.132687] RIP: 0033:0x7f3e907fdfea=0A= > > [442282.133754] RSP: 002b:00007ffee9139868 EFLAGS: 00000202 ORIG_RAX: 0= 0000000000000a5=0A= > > [442282.134842] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f= 3e907fdfea=0A= > > [442282.135909] RDX: 000055d13f5953b2 RSI: 000055d13f5953f9 RDI: 00007f= fee913bb51=0A= > > [442282.136944] RBP: 00007ffee913bb46 R08: 000055d1415e80d0 R09: 000000= 0000001000=0A= > > [442282.137962] R10: 0000000000000000 R11: 0000000000000202 R12: 00007f= 3e90ef0000=0A= > > [442282.138957] R13: 000055d1415e80d0 R14: 00007f3e90ef290f R15: 000000= 0000000000=0A= > > [442282.139918] Code: 80 3a 00 75 f7 48 83 c6 01 0f b6 4e ff 48 83 c2 0= 1 84 c9 88 4a ff 75 ed 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c= 7 01 <0f> b6 47 ff 48 83 c6 01 3a 46 ff 74 eb 19 c0 83 c8 01 5d c3 31=0A= > > [442282.142829] RIP: strcmp+0xe/0x30 RSP: ffffc9001bff7c88=0A= > > [442282.143759] CR2: 0000000000000000=0A= > > [7.] A small shell script or example program which triggers the=0A= > >=A0=A0=A0=A0=A0 problem (if possible)=0A= > >=0A= > > My colleague Vidhesh (CC'ed) will be glad to share further details on t= he test scenario and/or in-house reproduction.=A0 Please let us know of wor= karounds, if any.=0A= > >=0A= > > Thanks and Regards,=0A= > > =3D Ameya=0A= > >=0A= > >=0A= > >=0A= >=0A= =0A= =0A= -- =0A= Thanks,=0A= =0A= Steve=