Daniel Bilik <> changed:

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--- Comment #32 from Daniel Bilik <> ---
(In reply to Robert Watson from comment #29)

> On the whole, my intuition is towards a device-driver bug based
> on past experience.

We've been also struggling this in past weeks, and I can confirm Robert's

In our case, the bug affects two hosts running recent 10-STABLE, connected to
each other via igb(4) using a dedicated 100Mb switch. When trying to transfer
directory structure holding several gigabytes of data with rsync protocol,
either sender or receiver panics in less then a minute with:

Panic String: sbsndptr: sockbuf 0xfffff8000ccc76f8 and mbuf 0xfffff802a0145800

Interestingly, scp(1)ing data between the hosts doesn't seem to trigger this
panic such easily, but sometimes it does, mostly when copying larger (>1GB)

We've fixed this just yesterday by limiting number of igb(4) txrx queues, ie.
adding this into loader.conf:


Now the hosts run stable, periodically rsyncing data in both directions.

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