Hi,
Rather unbelievable, but upgrading the _kernel_ from 2.6.18-128.7.1 to
2.6.18-164.6.1 fixed the problem (we had good reasons not to upgrade,
but we worked around them).
Thanks,
Matthieu Moy <Matthieu.Moy@grenoble-inp.fr> writes:
> Hi,
>
> I'm having trouble with the sshd on one particular machine. In short:
>
> $ head -c 196481 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 65536
>
> (the 65536 here should have been a 196481 ...)
>
> This happens whether I launch the command from the machine, or from
> another remote machine. The OpenSSH version is:
>
> OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
>
> with:
>
> $ cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 5.4 (Tikanga)
> $ uname -a
> Linux machine-name 2.6.18-128.7.1.el5 #1 SMP Wed Aug 19 04:08:13 EDT 2009 ppc64 ppc64 ppc64 GNU/Linux
>
> One surprising thing:
>
> $ head -c 196481 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 65536
> $ head -c 196480 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 196480
>
> So, the bug is triggered when sending 196481 bytes or more, but the
> consequence is a truncation of the input at 65536=2^16 bytes.
>
> Any idea what's going on?
>
> Thanks,
>
> (please, keep me Cc-ed, I didn't subscribe to the list)
--
Matthieu Moy
http://www-verimag.imag.fr/~moy/
Rather unbelievable, but upgrading the _kernel_ from 2.6.18-128.7.1 to
2.6.18-164.6.1 fixed the problem (we had good reasons not to upgrade,
but we worked around them).
Thanks,
Matthieu Moy <Matthieu.Moy@grenoble-inp.fr> writes:
> Hi,
>
> I'm having trouble with the sshd on one particular machine. In short:
>
> $ head -c 196481 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 65536
>
> (the 65536 here should have been a 196481 ...)
>
> This happens whether I launch the command from the machine, or from
> another remote machine. The OpenSSH version is:
>
> OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
>
> with:
>
> $ cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 5.4 (Tikanga)
> $ uname -a
> Linux machine-name 2.6.18-128.7.1.el5 #1 SMP Wed Aug 19 04:08:13 EDT 2009 ppc64 ppc64 ppc64 GNU/Linux
>
> One surprising thing:
>
> $ head -c 196481 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 65536
> $ head -c 196480 /dev/zero | ssh machine-name 'LANG=C wc'
> 0 0 196480
>
> So, the bug is triggered when sending 196481 bytes or more, but the
> consequence is a truncation of the input at 65536=2^16 bytes.
>
> Any idea what's going on?
>
> Thanks,
>
> (please, keep me Cc-ed, I didn't subscribe to the list)
--
Matthieu Moy
http://www-verimag.imag.fr/~moy/