[Bug 244703] sys.netpfil.pf.nat.exhaust panics kernel
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Tue Dec 15 15:34:33 UTC 2020
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244703
--- Comment #11 from commit-hook at FreeBSD.org ---
A commit references this bug:
Author: kp
Date: Tue Dec 15 15:33:29 UTC 2020
New revision: 368663
URL: https://svnweb.freebsd.org/changeset/base/368663
Log:
MFC r368237:
if: Fix panic when destroying vnet and epair simultaneously
When destroying a vnet and an epair (with one end in the vnet) we often
panicked. This was the result of the destruction of the epair, which destroys
both ends simultaneously, happening while vnet_if_return() was moving the
struct ifnet to its home vnet. This can result in a freed ifnet being
re-added
to the home vnet V_ifnet list. That in turn panics the next time the ifnet is
used.
Prevent this race by ensuring that vnet_if_return() cannot run at the same
time
as if_detach() or epair_clone_destroy().
PR: 238870, 234985, 244703, 250870
Sponsored by: Modirum MDPay
Changes:
_U stable/12/
stable/12/sys/net/if.c
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