903890 – scrub-freespace didn't remove the scrub file, cause the file system 100% full

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Bug 903890 - scrub-freespace didn't remove the scrub file, cause the file system 100% full

Summary: scrub-freespace didn't remove the scrub file, cause the file system 100% full

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	scrub
Sub Component:
Version:	6.4
Hardware:	Unspecified
OS:	Unspecified
Priority:	urgent
Severity:	high
Target Milestone:	rc
Target Release:	---
Assignee:	Daniel Kopeček
QA Contact:	Stanislav Zidek
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	1070830 1083121
TreeView+	depends on / blocked

Reported:	2013-01-25 01:45 UTC by Mohua Li
Modified:	2014-10-14 07:05 UTC (History)
CC List:	12 users (show)
Fixed In Version:	scrub-2.2-2.el6
Doc Type:	Bug Fix
Doc Text:
Clone Of:	895903
Environment:
Last Closed:	2014-10-14 07:05:42 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2014:1493	0	normal	SHIPPED_LIVE	scrub bug fix and enhancement update	2014-10-14 01:28:21 UTC

Description Mohua Li 2013-01-25 01:45:13 UTC

+++ This bug was initially created as a clone of Bug #892274 +++

Description of problem:

scrub-freespace didn't fill any free space, scrub-device, scrub-file work correctly,  see below, 

><fs> scrub-freespace  /scrub
libguestfs: trace: scrub_freespace "/scrub"
libguestfs: send_to_daemon: 56 bytes: 00 00 00 34 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 74 | 00 00 00 0
0 | ...
guestfsd: main_loop: new request, len 0x34
scrub -X /sysroot/scrub
scrub: created directory /sysroot/scrub
scrub: unlinked /sysroot/scrub/scrub.000
scrub: removed /sysroot/scrub
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
gueslibguestfs: recv_from_daemon: 40 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 74 | 00 00 00 01 | 00 1
2 34 15 | ...
libguestfs: trace: scrub_freespace = 0

><fs> df
libguestfs: trace: df
libguestfs: send_to_daemon: 44 bytes: 00 00 00 28 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 7d | 00 00 00 0
0 | ...
tfsd: main_loop: proc 116 (scrub_freespace) took 1.59 seconds
guestfsd: main_loop: new request, len 0x28
df
libguestfs: recv_from_daemon: 208 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 7d | 00 00 00 01 | 00 12 3
4 16 | ...
libguestfs: trace: df = "Filesystem     1K-blocks  Used Available Use% Mounted on\n/dev              243
680     0    243680   0% /dev\n/dev/sda1          99035  1551     92371   2% /sysroot\n"
Filesystem     1K-blocks  Used Available Use% Mounted on
/dev              243680     0    243680   0% /dev
/dev/sda1          99035  1551     92371   2% /sysroot



Version-Release number of selected component (if applicable):
libguestfs-1.20.1-4.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1,guestfish -x -v -N fs mount /dev/sda1 / : scrub-freespace  /scrub : df 

  
Actual results:


Expected results:


Additional info:

--- Additional comment from Richard W.M. Jones on 2013-01-21 05:51:14 EST ---

moli: What exactly are you expecting here?

--- Additional comment from Mohua Li on 2013-01-22 01:14:58 EST ---

(In reply to comment #1)
> moli: What exactly are you expecting here?

ok, i admit, i'm a little confuse,according to the help

"  This command creates the directory "dir" and then fills it with files
    until the filesystem is full, and scrubs the files as for "scrub_file",
    and deletes them. The intention is to scrub any free space on the
    partition containing "dir".
"


in rhel6, it will fill the free space with scrub.*** file, and the filesystem is 100% full, but in rhel7, no scrub.*** file, and the filesystem have nothing changed, but in the help got "delete them" keyword, but from what scrub did, i think the behvaiour in rhel7 is a bug, 


><fs> scrub-freespace /scrub
libguestfs: trace: scrub_freespace "/scrub"
libguestfs: send_to_daemon: 56 bytes: 00 00 00 34 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 74 | 00 00 00 00 | ...
guestfsd: main_loop: proc 1 (mount) took 0.05 seconds
guestfsd: main_loop: new request, len 0x34
scrub -X /sysroot/scrub
libguestfs: recv_from_daemon: 40 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 74 | 00 00 00 01 | 00 12 34 03 | ...
libguestfs: trace: scrub_freespace = 0
><fs> ls /scrub
libguestfs: trace: ls "/scrub"
libguestfs: send_to_daemon: 56 bytes: 00 00 00 34 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 06 | 00 00 00 00 | ...
guestfsd: main_loop: proc 116 (scrub_freespace) took 6.68 seconds
guestfsd: main_loop: new request, len 0x34
guestfsd: main_loop: proc 6 (ls) took 0.00 seconds
libguestfs: recv_from_daemon: 60 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 06 | 00 00 00 01 | 00 12 34 04 | ...
libguestfs: trace: ls = ["scrub.000"]
scrub.000
><fs> df
libguestfs: trace: df
libguestfs: send_to_daemon: 44 bytes: 00 00 00 28 | 20 00 f5 f5 | 00 00 00 04 | 00 00 00 7d | 00 00 00 00 | ...
guestfsd: main_loop: new request, len 0x28
df
[   40.662316] df used greatest stack depth: 3056 bytes left
guestfsd: main_loop: proc 125 (df) took 0.00 seconds
libguestfs: recv_from_daemon: 240 bytes: 20 00 f5 f5 | 00 00 00 04 | 00 00 00 7d | 00 00 00 01 | 00 12 34 05 | ...
libguestfs: trace: df = "Filesystem           1K-blocks      Used Available Use% Mounted on\n/dev                    232704       132    232572   1% /dev\n/dev/vda1                99035     99034         0 100% /sysroot\n"
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev                    232704       132    232572   1% /dev
/dev/vda1                99035     99034         0 100% /sysroot

--- Additional comment from Richard W.M. Jones on 2013-01-22 08:38:10 EST ---

My test for this is:

$ guestfish -v -N fs -m /dev/sda1 scrub-freespace /scrub

For me this produces the output:

[...]
scrub -X /sysroot/scrub
scrub: created directory /sysroot/scrub
scrub: unlinked /sysroot/scrub/scrub.000
scrub: removed /sysroot/scrub
[...]

Also the disk image file is fully allocated after the scrub,
which indicates that data (scrubbing patterns) were written
all the way through to the block device:

$ du -sh test1.img 
99M	test1.img

I tried this out on Fedora 18 and RHEL 7 with the same results.

moli: Do you agree that my test indicates that this is not a bug?

I do not believe the output of 'df' inside the guest is relevant,
since scrub removes the scrubbed file afterwards, so disk free space
should be substantially the same before and after the test.

--- Additional comment from Mohua Li on 2013-01-22 21:54:25 EST ---

(In reply to comment #3)
> My test for this is:
> 
> $ guestfish -v -N fs -m /dev/sda1 scrub-freespace /scrub
> 
> For me this produces the output:
> 
> [...]
> scrub -X /sysroot/scrub
> scrub: created directory /sysroot/scrub
> scrub: unlinked /sysroot/scrub/scrub.000
> scrub: removed /sysroot/scrub
> [...]
> 
> Also the disk image file is fully allocated after the scrub,
> which indicates that data (scrubbing patterns) were written
> all the way through to the block device:
> 
> $ du -sh test1.img 
> 99M	test1.img
> 
> I tried this out on Fedora 18 and RHEL 7 with the same results.
> 
> moli: Do you agree that my test indicates that this is not a bug?
> 
> I do not believe the output of 'df' inside the guest is relevant,
> since scrub removes the scrubbed file afterwards, so disk free space
> should be substantially the same before and after the test.

Hi Rich,

That's what i confuse, if it's not a bug in rhel7, then there is a bug in rhel6, as it didn't remove the scrub file, as what imply in the help it do
need to remove the scrub file, any thought?

--- Additional comment from Richard W.M. Jones on 2013-01-23 05:25:02 EST ---

Yes I agree, this does seem to be a bug on RHEL 6.

$ guestfish -v -N fs -m /dev/sda1 scrub-freespace /scrub : df-h
[...]
scrub -X /sysroot/scrub
[...]
Filesystem            Size  Used Avail Use% Mounted on
/dev                  237M  132K  237M   1% /dev
/dev/vda1              97M   97M     0 100% /sysroot

On RHEL 6.3 the scrub directory is not removed and so it
ends up filling the disk to 100%.

This is a bug in RHEL 6 scrub:
http://code.google.com/p/diskscrub/issues/detail?id=9
which was fixed upstream:
http://code.google.com/p/diskscrub/source/detail?r=98d36b4836d741c7cb7664cbd21b3ae1c138881e

This fix needs to be backported to RHEL 6 scrub (NB:
it's a bug in scrub, not in libguestfs).

Comment 2 Richard W.M. Jones 2013-01-25 08:43:27 UTC

Not a chance we can fix this for RHEL 6.4!  Moving to 6.5 ..

Comment 6 Richard W.M. Jones 2013-06-28 11:09:04 UTC

Note this is a bug in scrub, not in libguestfs.

Reported upstream:
http://code.google.com/p/diskscrub/issues/detail?id=9

Fixed upstream:
http://code.google.com/p/diskscrub/source/detail?r=98d36b4836d741c7cb7664cbd21b3ae1c138881e

Comment 7 RHEL Program Management 2013-10-14 00:02:20 UTC

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unable to address this
request at this time.

Red Hat invites you to ask your support representative to
propose this request, if appropriate, in the next release of
Red Hat Enterprise Linux.

Comment 16 errata-xmlrpc 2014-10-14 07:05:42 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1493.html

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