The Precise Pangolin has reached end of life, so this bug will not be
fixed for that release
** Changed in: linux (Ubuntu Precise)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1038075
Title:
[quantal] overlayfs over r/o NFS mount triggers OOPS
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Precise:
Won't Fix
Bug description:
Scenario: booting from a read-only nfsroot share by using a tmpfs
overlay
This is used e.g. by the fai package, which uses the live-boot package
to create such an initramfs.
Test Case:
modprobe overlayfs
mkdir /tmp/live /tmp/root
mount -t nfs -o ro 192.168.42.40:/srv/fai/nfsroot.quantal64 /mnt
mount -t overlayfs -o noatime,lowerdir=/mnt,upperdir=/tmp/live overlayfs
/tmp/root
# the mount command succeeds! - However using the mount point breaks:
# find /tmp/root
/tmp/root
Killed
Dmesg shows this kernel trace:
Aug 17 14:58:04 faui49i kernel: [ 1071.305101] BUG: unable to handle kernel
NULL pointer dereference at 0000000000000038
Aug 17 14:58:04 faui49i kernel: [ 1071.306733] IP: [<ffffffffa01a2a71>]
nfs_lookup_revalidate+0x21/0x3a0 [nfs]
Aug 17 14:58:04 faui49i kernel: [ 1071.308449] PGD c5697067 PUD c570c067 PMD
0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Oops: 0000 [#1] SMP
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] CPU 1
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Modules linked in: overlayfs
autofs4 bnep rfcomm bluetooth lp snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_intel snd_hda_codec i915 snd_hwdep snd_pcm drm_kms_helper snd_seq_midi
drm coretemp snd_rawmidi snd_seq_midi_event snd_seq snd_timer kvm_intel
snd_seq_device i2c_algo_bit kvm snd hid_generic tpm_infineon soundcore
snd_page_alloc mei lpc_ich video microcode tpm_tis mac_hid ppdev parport_pc
parport serio_raw nfsd nfs lockd fscache auth_rpcgss nfs_acl binfmt_misc sunrpc
psmouse usbhid hid usbkbd raid10 raid456 async_pq async_xor xor async_memcpy
async_raid6_recov usb_storage e1000e floppy raid6_pq async_tx raid1 raid0
multipath linear
Aug 17 14:58:04 faui49i kernel: [ 1071.309061]
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Pid: 3543, comm: find Not
tainted 3.5.0-10-generic #10-Ubuntu FUJITSU ESPRIMO
P7935 /D2812-A2
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RIP: 0010:[<ffffffffa01a2a71>]
[<ffffffffa01a2a71>] nfs_lookup_revalidate+0x21/0x3a0 [nfs]
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RSP: 0018:ffff8800c5773b48
EFLAGS: 00010286
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RAX: ffffffffa01cf580 RBX:
ffff8800c5dc4b40 RCX: 0000000000000020
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RDX: ffff8800c5dc4038 RSI:
0000000000000000 RDI: ffff8800c5dc4b40
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RBP: ffff8800c5773b88 R08:
656c6f006576696c R09: 0000000000000000
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] R10: ffff8800c5dc4b40 R11:
ffffffffa01b5aa0 R12: ffff8800cb6cc600
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] R13: ffff8800c5773bd8 R14:
0000000000000000 R15: 0000000000000000
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] FS: 00007f42c1f2d700(0000)
GS:ffff88010dc80000(0000) knlGS:0000000000000000
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] CS: 0010 DS: 0000 ES: 0000
CR0: 000000008005003b
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] CR2: 0000000000000038 CR3:
00000000cb26b000 CR4: 00000000000407e0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Process find (pid: 3543,
threadinfo ffff8800c5772000, task ffff8800cb340000)
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Stack:
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] 0000000000000000
0000000000000000 ffff8800c5773b88 ffff8800c5dc4b40
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] ffff8800cb6cc600
ffff8800c5773bd8 0000000000000000 0000000000000000
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] ffff8800c5773bc8
ffffffff8118c79c 0000000000000000 ffff8800c5dc403c
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Call Trace:
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8118c79c>]
__lookup_hash+0xac/0x120
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8118d606>]
lookup_one_len+0xd6/0x110
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffffa0498b17>]
ovl_lookup+0x187/0x3d0 [overlayfs]
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff816808ee>] ?
_raw_spin_lock+0xe/0x20
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8118c751>]
__lookup_hash+0x61/0x120
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8118eaf9>] ?
lookup_fast+0x219/0x310
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8167678e>]
lookup_slow+0x47/0xab
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81190d48>]
path_lookupat+0x6f8/0x720
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffffa01a2692>] ?
nfs_readdir+0x322/0x510 [nfs]
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8116dd81>] ?
kmem_cache_alloc+0x31/0x130
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81190da1>]
do_path_lookup+0x31/0xc0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8118c9a3>] ?
getname_flags+0x53/0xf0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8119190d>]
user_path_at_empty+0x5d/0xa0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff811a035f>] ?
mntput_no_expire+0x10f/0x160
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff811a03d4>] ?
mntput+0x24/0x40
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8116e04c>] ?
kfree+0x2c/0x110
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81191961>]
user_path_at+0x11/0x20
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81186a75>]
vfs_fstatat+0x35/0x70
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff811a03d4>] ?
mntput+0x24/0x40
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff811832f2>] ?
fput+0x1a2/0x260
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81186d9a>]
sys_newfstatat+0x1a/0x40
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8117f856>] ?
filp_close+0x66/0xa0
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff8117fcfe>] ?
sys_close+0x9e/0x100
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] [<ffffffff81688b69>]
system_call_fastpath+0x16/0x1b
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] Code: ff ff 0f 1f 84 00 00 00
00 00 55 48 89 e5 48 83 ec 40 48 89 5d d8 4c 89 65 e0 4c 89 6d e8 4c 89 75 f0
4c 89 7d f8 66 66 66 66 90 <f6> 46 38 40 b8 f6 ff ff ff 49 89 fd 49 89 f7 0f 85
c4 00 00 00
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RIP [<ffffffffa01a2a71>]
nfs_lookup_revalidate+0x21/0x3a0 [nfs]
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] RSP <ffff8800c5773b48>
Aug 17 14:58:04 faui49i kernel: [ 1071.309061] CR2: 0000000000000038
Aug 17 14:58:04 faui49i kernel: [ 1071.524837] ---[ end trace
ec832cdfc17d33d8 ]---
---
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D3',
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p',
'/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D7p', '/dev/snd/seq', '/dev/snd/timer']
failed with exit code 1:
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg
-'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
dmesg: write failed: Broken pipe
DistroRelease: Ubuntu 12.10
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: FUJITSU ESPRIMO P7935
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: root=UUID=871b8166-1de3-42f9-845b-d3353e32beec ro quiet
splash
ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RfKill:
Tags: quantal
Uname: Linux 3.5.0-10-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: netgrp netgrp sbuild
WifiSyslog:
dmi.bios.date: 01/12/2010
dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
dmi.bios.version: 6.00 R1.20.2812.A2
dmi.board.name: D2812-A2
dmi.board.vendor: FUJITSU
dmi.board.version: S26361-D2812-A2
dmi.chassis.type: 6
dmi.chassis.vendor: FUJITSU
dmi.modalias:
dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvr6.00R1.20.2812.A2:bd01/12/2010:svnFUJITSU:pnESPRIMOP7935:pvr:rvnFUJITSU:rnD2812-A2:rvrS26361-D2812-A2:cvnFUJITSU:ct6:cvr:
dmi.product.name: ESPRIMO P7935
dmi.sys.vendor: FUJITSU
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