[RndTbl] sshd: Corrupted MAC on input.

Gilbert E. Detillieux gedetil at cs.umanitoba.ca
Tue Aug 4 13:31:00 CDT 2020

On 2020-08-04 1:04 p.m., David Milton wrote:
> It may be worth having a look at the switch interface statistics for that server. Such repeatable errors must be showing up somewhere other than the servers.

I'll have to check with the person who maintains those, as this is the 
"off-site" backup, and I don't have access to the switch(es).

> Also, can you replicate the problem locally?

Haven't been able to so far.  Of course, I don't have other systems at 
either end that are identical or even similar enough.


>> On Aug 4, 2020, at 12:55, Adam Thompson <athompso at athompso.net> wrote:
>> It's bizarre that you're getting this so consistently - the FCS plus the checksum between them should trigger TCP retries long before the errors percolate up to the application layer.
>> I can't remember, did you try disabling HW offload on both sending and receiving ends already?  (Either end could trigger the SSH abort.)
>> -Adam
>>> On 2020-08-04 11:14, Gilbert E. Detillieux wrote:
>>> Just FYI, I had an rsync fail just a while ago about 17 seconds (and
>>> 253MB) into a file transfer.  Same error on the remote side.
>>> After restarting, it died again, this time after 3m07s (and 2.6GB).
>>> So, it is fairly random, yet consistent!  :P
>>> Gilbert
>>>> On 2020-08-04 9:56 a.m., Gilbert E. Detillieux wrote:
>>>> On 2020-07-31 11:42 p.m., Trevor Cordes wrote:
>>>>> Gilbert, to confirm, your bug hits after you have transferred lots of
>>>>> data, right?  It's not giving this error right at the beginning upon
>>>>> connection, right?  Do you have any stats on approx how much data goes
>>>>> across each time before the error hits?  Is it consistent or all over
>>>>> the map?
>>>> Yes, these are on large file transfers.  Yes, they are occasional, and random.  But I had to restart a large (41-ish GB?) file transfer 3 times last week due to repeated errors.  A typical nightly backup results in 160 GB or so to transfer, and lately, the rsync fails (somewhere along the way) more often than not.
>>>> Gilbert

Gilbert E. Detillieux        E-mail:  <gedetil at cs.umanitoba.ca>
Dept. of Computer Science    Web:     http://www.cs.umanitoba.ca/~gedetil/
University of Manitoba       Phone:   (204)474-8161
Winnipeg MB CANADA  R3T 2N2  Fax:     (204)474-7609

More information about the Roundtable mailing list