[Bug 257067] panic: Assertion in_epoch(net_epoch_preempt) failed at /usr/src/sys/net/if_vlan.c:1185

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 09 Jul 2021 14:37:34 UTC

--- Comment #5 from Aleksandr Fedorov <afedorov@FreeBSD.org> ---
(In reply to Mark Johnston from comment #4)

I think the previous fix closed all similar problems:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248958 and

I have not yet found other problem areas in the ng_pppoe(4) code.

The main idea behind introducing NET_EPOCH in netgraph (4) is:
- Data processing (NG_SEND_DATA_ *) should always be in the NET_EPOCH section.
- Processing of service messages (NG_SEND_MSG_ *) should not be in the
NET_EPOCH section. Because message handling (* _rcvmsg, connect/disconnect
hooks, node constructor/destructor) allows sleeping and other forbidden
operations for NET_EPOCH section.

But on many nodes, some data processing routines generate messages, and message
processing routines generate data (as in this PR).

Unfortunately, there are cases that are not so easy to fix without reworking

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