I spoke too soon. We're still seeing the occasional Oops on some machines:
[ 88.174304] BUG: unable to handle kernel NULL pointer dereference at (null) [ 88.174377] IP: [<ffffffff8136cbb0>] strlen+0x0/0x30 [ 88.174445] PGD 79545067 PUD 7b108067 PMD 0 [ 88.174478] Oops: 0000 [#1] SMP [ 88.174502] Modules linked in: tcp_diag vmw_vsock_vmci_transport inet_diag vsock ip6t_REJECT xt_hl ip6t_rt ppdev nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG xt_multiport xt_limit xt_tcpudp xt_addrtype crct10dif_pclmul crc32_pclmul nf_conntrack_ipv4 ghash_clmulni_intel nf_defrag_ipv4 aesni_intel vmw_balloon xt_conntrack aes_x86_64 lrw ip6table_filter gf128mul ip6_tables glue_helper nf_conntrack_netbios_ns nf_conntrack_broadcast ablk_helper nf_nat_ftp cryptd nf_nat serio_raw nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables vmwgfx ttm parport_pc drm i2c_piix4 vmw_vmci shpchp mac_hid lp parport psmouse mptspi mptscsih e1000 floppy vmw_pvscsi vmxnet3 mptbase [ 88.174962] CPU: 0 PID: 1742 Comm: rsyslogd Not tainted 3.13.0-52-generic #85-Ubuntu [ 88.175004] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/14/2014 [ 88.175060] task: ffff88007953e000 ti: ffff88007b5dc000 task.ti: ffff88007b5dc000 [ 88.175100] RIP: 0010:[<ffffffff8136cbb0>] [<ffffffff8136cbb0>] strlen+0x0/0x30 [ 88.175142] RSP: 0018:ffff88007b5ddd60 EFLAGS: 00010206 [ 88.175175] RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000401 [ 88.175212] RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000000 [ 88.175250] RBP: ffff88007b5ddd90 R08: ffff88007b929e48 R09: ffff88007b5ddd60 [ 88.175288] R10: 0000000000000002 R11: ffff88007bb32e00 R12: 0000000000000005 [ 88.175325] R13: 0000000000000000 R14: ffff88007af55578 R15: ffff88007b929c60 [ 88.175372] FS: 00007f8dd1056780(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000 [ 88.175414] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.175444] CR2: 0000000000000000 CR3: 000000007b107000 CR4: 00000000000407f0 [ 88.175528] Stack: [ 88.175543] ffffffff810fb39b 0000000000000000 0000000000000004 ffff88007c502058 [ 88.175591] ffff88007b929c00 ffff88007b929c60 ffff88007b5dddf8 ffffffff810fdb36 [ 88.175639] ffffffff811d5710 000000047c502058 ffff88007af55540 ffff88003642f2b8 [ 88.175687] Call Trace: [ 88.175733] [<ffffffff810fb39b>] ? audit_compare_dname_path+0x2b/0xa0 [ 88.175771] [<ffffffff810fdb36>] __audit_inode_child+0xb6/0x330 [ 88.175819] [<ffffffff811d5710>] ? d_instantiate+0x50/0x70 [ 88.176851] [<ffffffff811ca090>] vfs_mknod+0x110/0x160 [ 88.177895] [<ffffffff816bf4a5>] unix_bind+0x2a5/0x360 [ 88.178903] [<ffffffff810ff142>] ? __audit_sockaddr+0x42/0x80 [ 88.179984] [<ffffffff8160d4f0>] SYSC_bind+0xe0/0x120 [ 88.181090] [<ffffffff8160e50e>] SyS_bind+0xe/0x10 [ 88.182224] [<ffffffff817330fd>] system_call_fastpath+0x1a/0x1f [ 88.183332] Code: 89 f8 48 89 e5 f6 82 40 c7 84 81 20 74 15 0f 1f 44 00 00 48 83 c0 01 0f b6 10 f6 82 40 c7 84 81 20 75 f0 5d c3 66 0f 1f 44 00 00 <80> 3f 00 55 48 89 e5 74 15 48 89 f8 0f 1f 40 00 48 83 c0 01 80 [ 88.186941] RIP [<ffffffff8136cbb0>] strlen+0x0/0x30 [ 88.188053] RSP <ffff88007b5ddd60> [ 88.189135] CR2: 0000000000000000 [ 88.190247] ---[ end trace e08453bad3880683 ]--- /proc/version_signature: Ubuntu 3.13.0-52.85-generic 3.13.11-ckt18 uname -a: Linux logs-cdn-1 3.13.0-52-generic #85-Ubuntu SMP Wed Apr 29 16:44:17 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1450442 Title: Kernel Oops - unable to handle kernel NULL pointer dereference at (null); Call Trace: [<ffffffff810fb39b>] ? audit_compare_dname_path+0x2b/0xa0 Status in linux package in Ubuntu: Fix Released Status in linux source package in Trusty: In Progress Status in linux source package in Utopic: In Progress Bug description: [Impact] Ubuntu VMWare instances running 3.13.0-51 will crash with the following backtrace: [ 12.357276] BUG: unable to handle kernel NULL pointer dereference at (null) [ 12.357886] IP: [<ffffffff8136cb80>] strlen+0x0/0x30 [ 12.358457] PGD 230fe9067 PUD 230d5c067 PMD 0 [ 12.359034] Oops: 0000 [#1] SMP [ 12.359590] Modules linked in: tcp_diag inet_diag vmw_vsock_vmci_transport vsock ip6t_REJECT xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack crct10dif_pclmul iptable_filter crc32_pclmul ip_tables ghash_clmulni_intel aesni_intel aes_x86_64 ppdev lrw x_tables gf128mul vmwgfx glue_helper ablk_helper cryptd ttm drm vmw_balloon serio_raw shpchp parport_pc lp i2c_piix4 parport mac_hid vmw_vmci psmouse mptspi vmw_pvscsi e1000 mptscsih floppy vmxnet3 mptbase [ 12.364773] CPU: 2 PID: 1718 Comm: fail2ban-server Not tainted 3.13.0-51-generic #84-Ubuntu [ 12.365587] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/14/2014 [ 12.367276] task: ffff880230fc3000 ti: ffff8802308c4000 task.ti: ffff8802308c4000 [ 12.368159] RIP: 0010:[<ffffffff8136cb80>] [<ffffffff8136cb80>] strlen+0x0/0x30 [ 12.369073] RSP: 0018:ffff8802308c5d60 EFLAGS: 00010212 [ 12.369963] RAX: 000000000000000d RBX: 000000000000000d RCX: 0000000000002df0 [ 12.370973] RDX: 0000000000000012 RSI: 0000000000000000 RDI: 0000000000000000 [ 12.372005] RBP: ffff8802308c5d90 R08: ffff8800b9218648 R09: ffff8802308c5d60 [ 12.372988] R10: 0000000000000002 R11: ffff88023082e180 R12: 0000000000000012 [ 12.373901] R13: 0000000000000000 R14: ffff880231f1b3f8 R15: ffff8800b9218460 [ 12.374827] FS: 00007f196f84c740(0000) GS:ffff88023fd00000(0000) knlGS:0000000000000000 [ 12.375752] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.376667] CR2: 0000000000000000 CR3: 0000000230872000 CR4: 00000000000407e0 [ 12.377684] Stack: [ 12.378612] ffffffff810fb39b 0000000000000000 0000000000000004 ffff88022ff74838 [ 12.379559] ffff8800b9218400 ffff8800b9218460 ffff8802308c5df8 ffffffff810fdb36 [ 12.380516] ffffffff811d56e0 000000042ff74838 ffff880231f1b3c0 ffff88022febecf8 [ 12.381506] Call Trace: [ 12.382630] [<ffffffff810fb39b>] ? audit_compare_dname_path+0x2b/0xa0 [ 12.383784] [<ffffffff810fdb36>] __audit_inode_child+0xb6/0x330 [ 12.384912] [<ffffffff811d56e0>] ? d_instantiate+0x50/0x70 [ 12.386013] [<ffffffff811ca060>] vfs_mknod+0x110/0x160 [ 12.387145] [<ffffffff816bf475>] unix_bind+0x2a5/0x360 [ 12.388207] [<ffffffff810ff142>] ? __audit_sockaddr+0x42/0x80 [ 12.389250] [<ffffffff8160d4c0>] SYSC_bind+0xe0/0x120 [ 12.390297] [<ffffffff8172e9fa>] ? do_page_fault+0x1a/0x70 [ 12.391303] [<ffffffff8160e4de>] SyS_bind+0xe/0x10 [ 12.392426] [<ffffffff817330bd>] system_call_fastpath+0x1a/0x1f [ 12.393581] Code: 89 f8 48 89 e5 f6 82 40 c7 84 81 20 74 15 0f 1f 44 00 00 48 83 c0 01 0f b6 10 f6 82 40 c7 84 81 20 75 f0 5d c3 66 0f 1f 44 00 00 <80> 3f 00 55 48 89 e5 74 15 48 89 f8 0f 1f 40 00 48 83 c0 01 80 [ 12.396831] RIP [<ffffffff8136cb80>] strlen+0x0/0x30 [ 12.397812] RSP <ffff8802308c5d60> [ 12.398769] CR2: 0000000000000000 [ 12.399743] ---[ end trace 2c5a33d31a03347e ]--- We've also seen this on our precise machines that are running the backported trusty kernel. When reverting to kernel 3.13.0-49 this no longer occurs. [Test Case] 1) Run an Ubuntu VMWare instance with the affected kernel. apt-get install auditd echo "-w /etc/test" >>/etc/audit/audit.rules /etc/init.d/auditd restart apt-get install linux-headers-3.13.0-51 linux-headers-3.13.0-51-generic linux-image-3.13.0-51-generic reboot attempt to login or ssh into the host - you'll get a similar stacktrace. [Fix] commit fcf22d8267ad2601fe9b6c549d1be96401c23e0b upstream -- uname -a: Linux search-2 3.13.0-51-generic #84-Ubuntu SMP Wed Apr 15 12:08:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux cat /proc/version_signature: Ubuntu 3.13.0-51.84-generic 3.13.11-ckt18 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450442/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
