PROBLEM: gzip locks while decompressing a particular file when on NFS v.3

PROBLEM: gzip locks while decompressing a particular file when on NFS v.3

[Willy Gardiol]

Problem: gzip hangs inside a kernel call when decompressing X430src-3.tgz 
(part of xfree86) on a NFS root system.

Full description: When i try to gunzip (or untar with -zx) the X430src-3.tgz 
archive (its MD5 checksum is correct) over a NFS mounted filesystem it hangs 
at the file 
xc/programs/Xserver/XpConfig/C/print/models/SPSPARC2/fonts/AvantGarde-Demi.pmf
every time. The only way to kill the stalled gzip is to reboot. The gunzip 
does not use CPU nor much ram. Tha same .tgz correctly decompress on a local 
hard drive on the same machine / same config.

keywords: NFS, KERNEL 2.6, NFSROOT, HANG

kernel version: 2.6.8 

Trigger: grab that file from xfree86 ftp site and decompress on a NFS mounted 
filesystem

Environment:
Linux shimitar 2.6.8-gentoo-r3 #1 Tue Aug 31 17:35:53 CEST 2004 i686 Mobile 
AMD Athl AuthenticAMD GNU/Linux

Gnu C                  3.3.4
Gnu make               3.80
binutils               2.14.90.0.8
util-linux             2.12
mount                  2.12
module-init-tools      3.0
e2fsprogs              1.35
nfs-utils              1.0.6
Linux C Library        2.3.3
Dynamic linker (ldd)   2.3.3
Procps                 3.1.15
Net-tools              1.60
Kbd                    1.12
Sh-utils               5.2.1
Modules Loaded         nvidia lp vmnet parport_pc parport vmmon snd_seq_midi 
snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_emul 
snd_emu10k1 snd_rawmidi snd_ac97_codec snd_util_mem snd_hwdep snd_seq_oss 
snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_pcm snd_page_alloc 
snd_timer snd_mixer_oss snd rtl8150 8139too thermal fan processor button 
battery ac bttv evdev tuner tvaudio video_buf i2c_algo_bit v4l2_common 
btcx_risc videodev soundcore usbhid via686a w83781d i2c_sensor i2c_isa 
i2c_core usblp usb_storage ohci_hcd ehci_hcd uhci_hcd usbcore sg sd_mod 
ide_scsi ide_cd sr_mod cdrom
"

System is Gentoo, gzip 1.3.5 tar 1.14

CPU info: shimitar scripts # cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 10
model name      : Mobile AMD Athl
stepping        : 0
cpu MHz         : 1603.845
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips        : 3178.49

Workaround: uncompress the file on a local hard drive then copy the files on 
the NFS partition. This is not acceptable.

ps: i am not subscribed to the list, please CC me....

bye and thanks.

Re: PROBLEM: gzip locks while decompressing a particular file when on NFS v.3

[Willy Gardiol]

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Hash: SHA1


I will try with 2.6.8.1 as soon as i can, meanwhile, i have discovered that 
the problem is resolved if i add the "tcp" option to the mount line.

I am downloading 2.6.8.1 right now...

The strace of gunzip is located at the following URL (it is about 100kb i am 
not attaching it at the mail):

"http://www.gardiol.org/strace.gzip"

I did many tests with different zipped files, this is the only case it fails.


Alle Sunday 12 September 2004 15:44, hai scritto:
> > kernel version: 2.6.8
> >
> > Trigger: grab that file from xfree86 ftp site and decompress on a NFS
> > mounted filesystem
> >
> > Environment:
> > Linux shimitar 2.6.8-gentoo-r3 #1 Tue Aug 31 17:35:53 CEST 2004 i686
> > Mobile AMD Athl AuthenticAMD GNU/Linux
> >
> > Gnu C                  3.3.4
> > Gnu make               3.80
> > binutils               2.14.90.0.8
> > util-linux             2.12
> > mount                  2.12
> > module-init-tools      3.0
> > e2fsprogs              1.35
> > nfs-utils              1.0.6
> > Linux C Library        2.3.3
> > Dynamic linker (ldd)   2.3.3
> > Procps                 3.1.15
> > Net-tools              1.60
> > Kbd                    1.12
> > Sh-utils               5.2.1
> > Modules Loaded         nvidia lp vmnet parport_pc parport vmmon
> > snd_seq_midi snd_emu10k1_synth snd_emux_synth snd_seq_virmidi
> > snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec snd_util_mem
> > snd_hwdep snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
> > snd_pcm_oss snd_pcm snd_page_alloc snd_timer snd_mixer_oss snd rtl8150
> > 8139too thermal fan processor button battery ac bttv evdev tuner tvaudio
> > video_buf i2c_algo_bit v4l2_common btcx_risc videodev soundcore usbhid
> > via686a w83781d i2c_sensor i2c_isa i2c_core usblp usb_storage ohci_hcd
> > ehci_hcd uhci_hcd usbcore sg sd_mod ide_scsi ide_cd sr_mod cdrom
> > "
>
> 2.6.8 had some bug in nfs, please use 2.6.8.1 or 2.6.9-rc1, and test it
> over again, without tainting the kernel (you at least have nvidia module
> in there).

- --

!
 Willy Gardiol - willy@gardiol.org
 www.gardiol.org
 +39 3492800983
 Use linux for your freedom.

    "Unix _IS_ user friendly -
     it's just selective about
 who its friends are !"

    "Unix _E'_ semplice da usare -
     è solo molto selettivo nei confronti
           di chi siano i suoi amici !"

      Martin Spott (2002)

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