deleted /dev/zero

deleted /dev/zero

[Jun Sun]

I am running some stress tests (such as ltp, netperf, lmbench, etc) on the SMP 
swarm board.  Once in a while I notice /dev/zero will get deleted.  This 
causes all kinds of weired problems (such as internal gcc error.  Why?)

I don't know how to re-produce this problem yet.  It seems a little 
non-deterministic.  I would appreciate any insight into this problem.

Jun

Re: deleted /dev/zero

[Liam Davies]

Jun Sun wrote:
> 
> I don't know how to re-produce this problem yet.  It seems a little 
> non-deterministic.  I would appreciate any insight into this problem.


The ltp mtest05 test had a bug in which it would remove /dev/zero when
it cleaned up. Have you got an updated ltp suite?

This is the fix that they did in late March to the mtest05 test.

/ltp/ltp/testcases/kernel/mem/mtest05/mmstress.c:246
-    if (strcmp(filename, "NULL") || strcmp(filename, "/dev/zero"))
+    if (strcmp(filename, "NULL") && strcmp(filename, "/dev/zero"))

I suppose that there may be other LTP tests that could have similar
bugs...


Cheers
Liam

Re: deleted /dev/zero

[Jun Sun]

Thanks.  I am using an old version of ltp, and I still see the bug there.

Jun

Liam Davies wrote:

> Jun Sun wrote:
> 
>>
>> I don't know how to re-produce this problem yet.  It seems a little 
>> non-deterministic.  I would appreciate any insight into this problem.
> 
> 
> 
> The ltp mtest05 test had a bug in which it would remove /dev/zero when
> it cleaned up. Have you got an updated ltp suite?
> 
> This is the fix that they did in late March to the mtest05 test.
> 
> /ltp/ltp/testcases/kernel/mem/mtest05/mmstress.c:246
> -    if (strcmp(filename, "NULL") || strcmp(filename, "/dev/zero"))
> +    if (strcmp(filename, "NULL") && strcmp(filename, "/dev/zero"))
> 
> I suppose that there may be other LTP tests that could have similar
> bugs...
> 
> 
> Cheers
> Liam
> 
> 
> 
> 

Re: deleted /dev/zero

[Maciej W. Rozycki]

On Tue, 14 May 2002, Liam Davies wrote:

> The ltp mtest05 test had a bug in which it would remove /dev/zero when
> it cleaned up. Have you got an updated ltp suite?
> 
> This is the fix that they did in late March to the mtest05 test.
> 
> /ltp/ltp/testcases/kernel/mem/mtest05/mmstress.c:246
> -    if (strcmp(filename, "NULL") || strcmp(filename, "/dev/zero"))
> +    if (strcmp(filename, "NULL") && strcmp(filename, "/dev/zero"))
> 
> I suppose that there may be other LTP tests that could have similar
> bugs...

 Which only proves again one shouldn't run software as root unless
absolutely needed... 

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +