TCP-MD5 checksum failure on x86_64 SMP

Bhaskar Dutta
2010-05-04T03:30:34Z

Hi,

I am observing intermittent TCP-MD5 checksum failures
(CONFIG_TCP_MD5SIG) on kernel 2.6.31 while talking to a BGP router.

The problem is only seen in multi-core 64 bit machines.
Is there any known bug in the per_cpu_ptr implementation (I am aware
that the percpu allocator has been re-implemented in 2.6.33) that
might cause a corruption in 64 bit SMP machines?

Any pointers would be appreciated.

Thanks,
Bhaskar