[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1365485
Title:
Kernel BUG with multiple NFS4 kerberos mounts on boot
Status in “linux” package in Ubuntu:
Expired
Bug description:
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.
---
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
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