Kernel 2.2.17 bug found

Kernel 2.2.17 bug found

[Andrea Pintori]

I've a Debian dist, Kernel 2.2.17, no patches, all packages are stable.

here what I found:

[/tmp] mkdir old
[/tmp] chdir old
[/tmp/old] mv . ../new
[/tmp/old]                    (should be /tmp/new !!)
[/tmp/old] mkdir fff
error: cannot write...
[tmp/old] ls > fff
error: cannot write...
[/tmp/old] ls -la
total 0                         (?)
[/tmp/old] cd ..
[/tmp] ls -la
*****************       ./
*****************       ../
*****************       new/

Does anybody knew this bug?
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Re: Kernel 2.2.17 bug found

[Tim Waugh]

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On Thu, Nov 09, 2000 at 05:20:22PM +0200, Andrea Pintori wrote:

> [/tmp/old] mv . ../new
> [/tmp/old]                    (should be /tmp/new !!)

You forgot to 'cd .'

Tim.
*/

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Re: Kernel 2.2.17 bug found

[Michael Rothwell]

Tim Waugh wrote:

> You forgot to 'cd .'

Look for "pebsak" messages in /var/log/syslog

;)
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Re: Kernel 2.2.17 bug found

[Thomas Köhler]

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On Thu, Nov 09, 2000 at 05:20:22PM +0200,
Andrea Pintori <1997s112@educ.disi.unige.it> wrote:
> 
> I've a Debian dist, Kernel 2.2.17, no patches, all packages are stable.

I've Debian unstable, Kernel 2.2.17

> here what I found:
> 
> [/tmp] mkdir old
> [/tmp] chdir old
> [/tmp/old] mv . ../new
> [/tmp/old]                    (should be /tmp/new !!)

Uhm, no. $PWD only gets updated on cd, not on mv. Thus, the old value is
OK!

> [/tmp/old] mkdir fff
> error: cannot write...
> [tmp/old] ls > fff
> error: cannot write...

This seems wrong. But I'd rather say this is a bug in your shell, not in
the kernel!

/tmp> mkdir old
/tmp> cd old 
/tmp/old> mv . ../new
/tmp/old> mkdir fff
/tmp/old> ls -al 
total 12
drwxr-xr-x    3 jean-luc jean-luc     4096 Nov  9 16:46 .
drwxrwxrwt    8 root     root         4096 Nov  9 16:46 ..
drwxr-xr-x    2 jean-luc jean-luc     4096 Nov  9 16:46 fff
/tmp/old> cd ../new
/tmp/new> ls -al
total 12
drwxr-xr-x    3 jean-luc jean-luc     4096 Nov  9 16:46 .
drwxrwxrwt    8 root     root         4096 Nov  9 16:46 ..
drwxr-xr-x    2 jean-luc jean-luc     4096 Nov  9 16:46 fff

Works for both bash-2.04 and zsh-3.1.9-dev7 (as in Debian unstable).

> Does anybody knew this bug?

Well, I can't even reproduce it ;)

Ciao,
Thomas

-- 
 Thomas Köhler Email:   jean-luc@picard.franken.de     | LCARS - Linux
     <><        WWW:     http://jeanluc-picard.de      | for Computers
                IRC:             jeanluc               | on All Real
               PGP public key available from Homepage! | Starships

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Re: Kernel 2.2.17 bug found

[Richard B. Johnson]

On Thu, 9 Nov 2000, Andrea Pintori wrote:

> I've a Debian dist, Kernel 2.2.17, no patches, all packages are stable.
> 
> here what I found:
> 
> [/tmp] mkdir old
> [/tmp] chdir old
> [/tmp/old] mv . ../new
> [/tmp/old]                    (should be /tmp/new !!)

The shell might not read this all the while so the name you see
may not change until you change directory.

> [/tmp/old] mkdir fff
> error: cannot write...

This should not happen and it doesn't happen in kernel version 2.4.0-test0

> [tmp/old] ls > fff
> error: cannot write...
> [/tmp/old] ls -la
> total 0                         (?)
> [/tmp/old] cd ..
> [/tmp] ls -la
> *****************       ./
> *****************       ../
> *****************       new/
> 


Script started on Thu Nov  9 10:45:35 2000
# pwd
/tmp
# mkdir old
# cd old
# pwd
/tmp/old
# mv ../old ../new
# pwd
/tmp/old       The shell hasn't re-read the current directory
# ls
# >foo		Make a file called foo
# ls
foo		It's there okay
# rm foo	Remove the file 
# mkdir bar	Make a directory
# ls
bar		It's there
# cd bar
# pwd
/tmp/new/bar	Now, the shell re-read the directory, it is correct
# cd ..
# pwd
/tmp/new	Back where we were, shell reads correct directory.
# cd ..
# ls
new  typescript
# rm -r new
# exit
exit

Script done on Thu Nov  9 10:47:23 2000



Cheers,
Dick Johnson

Penguin : Linux version 2.4.0 on an i686 machine (799.54 BogoMips).

"Memory is like gasoline. You use it up when you are running. Of
course you get it all back when you reboot..."; Actual explanation
obtained from the Micro$oft help desk.


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Re: Kernel 2.2.17 bug found

[Jesse Pollard]

On Thu, Nov 09, 2000 at 05:20:22PM +0200, Andrea Pintori wrote:
> I've a Debian dist, Kernel 2.2.17, no patches, all packages are stable.
> 
> here what I found:
> 
> [/tmp] mkdir old
> [/tmp] chdir old
> [/tmp/old] mv . ../new
> [/tmp/old]                    (should be /tmp/new !!)
> [/tmp/old] mkdir fff
> error: cannot write...
> [tmp/old] ls > fff
> error: cannot write...
> [/tmp/old] ls -la
> total 0                         (?)
> [/tmp/old] cd ..
> [/tmp] ls -la
> *****************       ./
> *****************       ../
> *****************       new/
> 
> Does anybody knew this bug?

Not a bug... possibly a typo though. The "[/tmp/old] mv . ../new" line
destroys the definition of "current directory". The "mkdir fff" can't work
since the current directory is no longer there, and is indicated by
the lines:
     [/tmp/old] ls -la
     total 0                         (?)

There is nothing to take a directory of.
-------------------------------------------------------------------------
Jesse I Pollard, II
Email: pollard@navo.hpc.mil

Any opinions expressed are solely my own.
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Re: Kernel 2.2.17 bug found

[J . A . Magallon]

On Thu, 09 Nov 2000 16:20:22 Andrea Pintori wrote:
> I've a Debian dist, Kernel 2.2.17, no patches, all packages are stable.
> 
> here what I found:
> 
> [/tmp] mkdir old
> [/tmp] chdir old
> [/tmp/old] mv . ../new
> [/tmp/old]                    (should be /tmp/new !!)

No, bash cwd is still "/tmp/old".

> [/tmp/old] mkdir fff
> error: cannot write...
> [tmp/old] ls > fff
> error: cannot write...
> [/tmp/old] ls -la
> total 0                         (?)

Right, "/tmp/old" does not exist, so nothing can be done with it.

> [/tmp/old] cd ..
> [/tmp] ls -la
> *****************       ./
> *****************       ../
> *****************       new/
> 
> Does anybody knew this bug?

Is not a bug, I have also seen that int SGI IRIX. Try it in an NFS mounted
disk. I don't remember exactly, but even you can ls it. Things on file
system caches and so on...

-- 
Juan Antonio Magallon Lacarta                                 #> cd /pub
mailto:jamagallon@able.es                                     #> more beer

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