kernel: zam-7001: io error in reiserfs_find_entry

linux-lvm Jürgen Vollmer 4 participants 5 messages Jan 11, 2002

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Jürgen Vollmer

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2002-01-11 04:31 UTC #0 lore raw

Hi everybody,

I use kernel-source-2.4.16.SuSE-24.i386.rpm together with reiserfs and made a snapshot which I then tar'ed.
Writing the tape seems to be ok. After that I did:

	tar --directory=/ --file=/dev/tape --compare

and got the message (while working i.e. modifying the original filesystem)

Message from syslogd@joergli at Fri Jan 11 10:57:19 2002 ... joergli kernel: zam-7001: io error in reiserfs_find_entry

The entire message in /var/log/message is:
--------------

Jan 11 10:57:19 joergli kernel: lvm -- giving up to snapshot /dev/LVMhome_vg/home on /dev/LVMhome_vg/lvm-snapshot: out of space
Jan 11 10:57:19 joergli kernel: lvm - lvm_map: ll_rw_blk for inactive LV /dev/LVMhome_vg/lvm-snapshot
Jan 11 10:57:19 joergli kernel: zam-7001: io error in reiserfs_find_entry
Jan 11 10:57:19 joergli kernel: invalid operand: 0000
Jan 11 10:57:19 joergli kernel: CPU:    1
Jan 11 10:57:19 joergli kernel: EIP:    0010:[ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21171255/96]    Tainted: PF
Jan 11 10:57:19 joergli kernel: EFLAGS: 00010286
Jan 11 10:57:19 joergli kernel: eax: 0000002d   ebx: c1fdea40   ecx: 00000001   edx: 00000001
Jan 11 10:57:19 joergli kernel: esi: c3170800   edi: cde2dee0   ebp: cde2de74   esp: cde2de2c
Jan 11 10:57:19 joergli kernel: ds: 0018   es: 0018   ss: 0018
Jan 11 10:57:19 joergli kernel: Process tar (pid: 19852, stackpage=cde2d000)
Jan 11 10:57:19 joergli kernel: Stack: c1fe031a c1fe3aa0 c1fdea40 cde2de50 cde2de5c c1fdeaac c1fc3f36 c3170800
Jan 11 10:57:19 joergli kernel:        c1fdea40 00000000 c1fdeaac cde2dea0 0001e7e7 0001e7e8 05c75bff 000001f4
Jan 11 10:57:19 joergli kernel:        00000000 00000003 d7bace60 c1fc4050 c77b8520 d7bacec0 00000008 cde2dea0
Jan 11 10:57:19 joergli kernel: Call Trace: [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21101798/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21087584/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21108160/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21108052/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21217482/96]
Jan 11 10:57:19 joergli kernel:    [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21108160/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21108052/96] [ipv6:__insmod_ipv6_O/lib/modules/2.4.16-SMP/kernel/net/ipv6/ipv6+-21217200/96] [d_alloc+27/376] [real_lookup+122/264] [link_path_walk+1479/2080]
Jan 11 10:57:19 joergli kernel:    [path_walk+26/28] [__user_walk+53/80] [sys_lstat64+25/112] [sys_close+95/116] [system_call+51/56]
Jan 11 10:57:19 joergli kernel:
Jan 11 10:57:19 joergli kernel: Code: 0f 0b 68 a0 3a fe c1 85 f6 74 0f 0f b7 46 08 50 e8 32 77 16

--------------

So it seems that the snapshot is full. Is that correct, or do I have a serious problem? Note: I'm doing my backups, so a dead backup is not a very good one :-)

With best regards

Jürgen

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Dr.rer.nat. Juergen Vollmer, Viktoriastrasse 15, D-76133 Karlsruhe
Tel: +49(721) 9204871 Fax: +49(721) 24874
[email protected],[email protected],[email protected]
www.informatik-vollmer.de

Patrick Caulfield

2002-01-11 04:38 UTC #1 lore raw

Quoted 17 lines · J?rgen Vollmer

Hi everybody,
I use kernel-source-2.4.16.SuSE-24.i386.rpm together with reiserfs and made a snapshot which I then tar'ed.
Writing the tape seems to be ok. After that I did:
	tar --directory=/ --file=/dev/tape --compare
and got the message (while working i.e. modifying the original filesystem)
Message from syslogd@joergli at Fri Jan 11 10:57:19 2002 ... joergli kernel: zam-7001: io error in reiserfs_find_entry

Quoted 3 lines

So it seems that the snapshot is full. Is that correct, or do I have a serious problem? Note: I'm doing my backups, so a dead backup is not a very good one :-)

Yes, your snapshot is full. When this happens LVM fails all I/O to the snapshot. Unfortunatetly reiserfs doesn't not currently cope very well with I/O errors on a device hence the message you saw.

You will need to allocate more space to the snapshot LV to get around this.

It's not a serious problem but if you are bothered by the oops I posted a patch to workaround to the problem here:

http://lists.sistina.com/pipermail/linux-lvm/2001-November/009913.html

It's not great and it doesn't stop the full snapshot being unusable, but it does stop the oopses.

patrick

Thomas Ziegler

2002-01-11 04:52 UTC #2 lore raw

Quoted 28 lines · Patrick Caulfield

Quoted 17 lines · J?rgen Vollmer
Hi everybody,
I use kernel-source-2.4.16.SuSE-24.i386.rpm together with reiserfs and made a snapshot which I then tar'ed.
Writing the tape seems to be ok. After that I did:
	tar --directory=/ --file=/dev/tape --compare
and got the message (while working i.e. modifying the original filesystem)
Message from syslogd@joergli at Fri Jan 11 10:57:19 2002 ... joergli kernel: zam-7001: io error in reiserfs_find_entry
Quoted 3 lines
So it seems that the snapshot is full. Is that correct, or do I have a serious problem? Note: I'm doing my backups, so a dead backup is not a very good one :-)
Yes, your snapshot is full. When this happens LVM fails all I/O to the snapshot. Unfortunatetly reiserfs doesn't not currently cope very well with I/O errors on a device hence the message you saw.
You will need to allocate more space to the snapshot LV to get around this.

Quoted 8 lines

It's not a serious problem but if you are bothered by the oops I posted a patch to workaround to the problem here:
http://lists.sistina.com/pipermail/linux-lvm/2001-November/009913.html
It's not great and it doesn't stop the full snapshot being unusable, but it does stop the oopses.

Some Questions to LVM and snapshots:

- Do other filesystems cope in a better way with a full snapshot than reiserfs?

- What's the preferred fs in conjunction with lvm?

- Is there a way to get the snapshot not destroyed if it is getting full?

Thanks in advance,
Thomas

Signature · 5 lines

Dr.-Ing. Thomas Ziegler            |
Senior Research Engineer           | Coding Technologies
phone: +49 (0) 911 92891 -27       | Deutschherrnstr. 15-19
fax:   +49 (0) 911 92891 -99       | D-90429 Nï¿½rnberg, Germany
mailto:[email protected]  | http://www.CodingTechnologies.com

Patrick Caulfield

2002-01-11 05:02 UTC #3 lore raw

Quoted 4 lines · Thomas Ziegler

Some Questions to LVM and snapshots:
- Do other filesystems cope in a better way with a full snapshot than reiserfs?

Well ext2 just spits out errors without oopsing. I'm not sure about XFS or JFS.

Quoted 1 line

- What's the preferred fs in conjunction with lvm?

Whatever fs you prefer. That's why there's a choice !

Quoted 1 line

- Is there a way to get the snapshot not destroyed if it is getting full?

No. Once the snapshot is full then it can't be valid because there may be blocks written to the original device that the snapshot can't backup. The only way aoud this is to make your snapshots large enough to hold all the data that is going to change on the original device during the backup.

patrick

Chris Mason

2002-01-11 08:39 UTC #4 lore raw

Quoted 6 lines · On Friday, January 11, 2002 11:01:46 AM +0000 Patrick Caulfield…

Quoted 5 lines · Thomas Ziegler
Some Questions to LVM and snapshots:
- Do other filesystems cope in a better way with a full snapshot than reiserfs?

I've started cleaning these and a few other io related errors up, this won't be an open issue much longer.

-chris