[DRBD-user] Sending time expired on SyncSource node

Robert Altnoeder robert.altnoeder at linbit.com
Wed Sep 26 14:35:24 CEST 2018

On 09/26/2018 01:11 PM, Bao Nguyen wrote:
> drbd drbd0 my-1: [drbd_s_drbd0/6434] sending time expired, ko = 4294967295

At first glance, this appears to be a warning that a network packet was
not transferred successfully, but is still being retried. But then, the
ko_count apparently was supposed to stop upon reaching 0, and here we
have 4,204,957,295, which is consistent with an unsigned integer
underflow (subtracting 1 from 0), so there may be some bug involved as well.

> I am using drbd 9.0.1.

...which might be the reason for the problem in the first case. The
current version is 9.0.15, and there were lots of changes in the
meantime, some of them are very important fixes. It is certainly
advisable to upgrade this DRBD module as soon as possible.


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