On Thu, 30 Jan 2020, Gleb Smirnoff wrote:
On Thu, Jan 30, 2020 at 12:04:03PM +0000, Hans Petter Selasky wrote:
H> Author: hselasky
H> Date: Thu Jan 30 12:04:02 2020
H> New Revision: 357293
H> URL: https://svnweb.freebsd.org/changeset/base/357293
H>
H> Log:
H> Widen EPOCH(9) usage in netisr.
H>
H> Software interrupt handlers are allowed to sleep. In swi_net() there
H> is a read lock behind NETISR_RLOCK() which in turn ends up calling
H> msleep() which means the whole of swi_net() cannot be protected by an
H> EPOCH(9) section. By default the NETISR_LOCKING feature is disabled.
H>
H> This issue was introduced by r357004. This is a preparation step for
H> replacing the functionality provided by r357004.
H>
H> Found by: kib@
H> Sponsored by: Mellanox Technologies
What?! NETISR_RLOCK() which in turn ends up calling msleep()? Can you please
explain this nonsense?
It does not look like NETISR_RLOCK is configured as sleepable so it just
uses a mtx.
Jeff
--
Gleb Smirnoff
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