apport information ** Tags added: apport-collected
** Description changed: Currently latest Ubuntu Linux kernel image has a a bug, probably a race condition, which happens when there are multiple kerberos nfs4 mounts in /etc/fstab. This does not happen on every boot, so to reproduce this you probably need a few retries. This happens using the current Ubuntu Linux kernel in 14.04: # cat /proc/version_signature Ubuntu 3.13.0-35.62-generic 3.13.11.6 Apparently you need to have _multiple_ kerberos NFS4 mounts in /etc/fstab to trigger this: xxxxxx.helsinki.fi:/root_vdm_3/fshome1/u1 /home/ad/fshome1/u1 nfs4 sec=krb5,rw,bg,hard 0 0 xxxxxx.helsinki.fi:/root_vdm_3/fshome2/u2 /home/ad/fshome2/u2 nfs4 sec=krb5,rw,bg,hard 0 0 xxxxxx.helsinki.fi:/root_vdm_3/fshome3/u3 /home/ad/fshome3/u3 nfs4 sec=krb5,rw,bg,hard 0 0 xxxxxx.helsinki.fi:/root_vdm_3/fshome4/u4 /home/ad/fshome4/u4 nfs4 sec=krb5,rw,bg,hard 0 0 xxxxxx.helsinki.fi:/root_vdm_3/fshome5/u5 /home/ad/fshome5/u5 nfs4 sec=krb5,rw,bg,hard 0 0 xxxxxx.helsinki.fi:/root_vdm_3/fshome6/u6 /home/ad/fshome6/u6 nfs4 sec=krb5,rw,bg,hard 0 0 When this happens we get a kernel stack trace (complete trace included), which starts like this: [ 19.999751] gss_pipe_downcall: bad return from gss_fill_context: -4 [ 19.999779] ------------[ cut here ]------------ [ 19.999791] kernel BUG at /build/buildd/linux-3.13.0/net/sunrpc/auth_gss/auth_gss.c:735! [ 19.999796] invalid opcode: 0000 [#1] SMP [ 19.999802] Modules linked in: arc4(+) des_generic cmac xcbc nfsv4 rmd160 crypto_null af_key xfrm_algo dm_crypt snd_hda_codec_realtek gpio_ich hp_wmi sparse_keymap snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi coretemp dm_multipath snd_seq kvm_intel scsi_dh kvm snd_seq_device bnep serio_raw rfcomm snd_timer bluetooth lpc_ich snd soundcore tpm_infineon mei_me mei mac_hid parport_pc ppdev lp parport binfmt_misc rpcsec_gss_krb5 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache dm_mirror dm_region_hash dm_log hid_generic usbhid hid nouveau mxm_wmi video i2c_algo_bit ttm e1000e drm_kms_helper ahci psmouse libahci drm wmi ptp pps_core When this has happened, rpc.gssd gets stuck in D state: # ps aux|grep gssd root 452 0.0 0.0 0 0 ? Ds 13:18 0:00 [rpc.gssd] Also NFS4 mounts will fail, with an error message which does not tell what is actually going on: root@do0-kukad211-07:~# mount -a -t nfs4 mount.nfs4: access denied by server while mounting xxxx.helsinki.fi:/root_vdm_3/fshome1/u1 mount.nfs4: access denied by server while mounting xxxx.helsinki.fi:/root_vdm_3/fshome2/u2 mount.nfs4: access denied by server while mounting xxxx.helsinki.fi:/root_vdm_3/fshome3/u3 mount.nfs4: access denied by server while mounting xxxx.helsinki.fi:/root_vdm_3/fshome4/u4 mount.nfs4: access denied by server while mounting xxxx..helsinki.fi:/root_vdm_3/fshome5/u5 mount.nfs4: access denied by server while mounting xxxx.helsinki.fi:/root_vdm_3/fshome6/u6 This also happened on Ubuntu 12.04, so the bug is probably old. There is a bug report, which is (IMHO) incorrectly reported against nfs-utils: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1046762 - We will fix this by removing the NFS mounts from fstab and doing them - sequentially in startup scripts, but it would be nice if the kernel race - would be fixed too. + We will fix this by removing the NFS mounts from fstab and doing them sequentially in startup scripts, but it would be nice if the kernel race would be fixed too. + --- + ApportVersion: 2.14.1-0ubuntu3.3 + Architecture: amd64 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: lightdm 2698 F.... pulseaudio + /dev/snd/seq: timidity 2607 F.... timidity + CRDA: Error: [Errno 2] No such file or directory + CurrentDmesg: + [ 23.980615] init: gdm main process (1881) killed by TERM signal + [ 25.395448] init: plymouth-upstart-bridge main process ended, respawning + [ 25.402287] init: plymouth-upstart-bridge main process (2248) terminated with status 1 + [ 25.402298] init: plymouth-upstart-bridge main process ended, respawning + [ 27.805918] init: plymouth-stop pre-start process (2612) terminated with status 1 + DistroRelease: Ubuntu 14.04 + HibernationDevice: RESUME=UUID=c7fe0bc6-4712-4a0e-9f10-9ade6280a12e + IwConfig: + eth0 no wireless extensions. + + lo no wireless extensions. + MachineType: Hewlett-Packard HP Compaq 8000 Elite CMT PC + Package: linux (not installed) + ProcFB: 0 nouveaufb + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=268aac80-328a-4ab2-9e21-f38b9897ba79 ro adhome quiet splash vt.handoff=7 + ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6 + PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. + RelatedPackageVersions: + linux-restricted-modules-3.13.0-35-generic N/A + linux-backports-modules-3.13.0-35-generic N/A + linux-firmware 1.127.5 + RfKill: + + Tags: trusty + Uname: Linux 3.13.0-35-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: + + _MarkForUpload: True + dmi.bios.date: 10/22/2009 + dmi.bios.vendor: Hewlett-Packard + dmi.bios.version: 786G7 v01.02 + dmi.board.asset.tag: CZC042D2X6 + dmi.board.name: 3647h + dmi.board.vendor: Hewlett-Packard + dmi.chassis.asset.tag: CZC042D2X6 + dmi.chassis.type: 6 + dmi.chassis.vendor: Hewlett-Packard + dmi.modalias: dmi:bvnHewlett-Packard:bvr786G7v01.02:bd10/22/2009:svnHewlett-Packard:pnHPCompaq8000EliteCMTPC:pvr:rvnHewlett-Packard:rn3647h:rvr:cvnHewlett-Packard:ct6:cvr: + dmi.product.name: HP Compaq 8000 Elite CMT PC + dmi.sys.vendor: Hewlett-Packard ** Attachment added: "AlsaInfo.txt" https://bugs.launchpad.net/bugs/1365485/+attachment/4195379/+files/AlsaInfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1365485 Title: Kernel BUG with multiple NFS4 kerberos mounts on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1365485/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
