Date: Fri, 29 Jan 2021 01:06:05 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 234985] epair: Kernel panic when destroying epair interface of vnet jail after using ifconfig inside the jail Message-ID: <bug-234985-7501-2a1YAMbG2Q@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-234985-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-234985-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234985 --- Comment #25 from commit-hook@FreeBSD.org --- A commit in branch releng/12.1 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=3De0c15f45abd4bd5165e11b557a8c90d0f= af5cfeb commit e0c15f45abd4bd5165e11b557a8c90d0faf5cfeb Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2021-01-18 21:55:53 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2021-01-29 00:58:55 +0000 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 t= he 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 if= net is used. Prevent this race by ensuring that vnet_if_return() cannot run at the s= ame time as if_detach() or epair_clone_destroy(). PR: 238870, 234985, 244703, 250870 Sponsored by: Modirum MDPay Approved by: so sys/net/if.c | 147 +++++++++++++++++++++++++++++++++++++--------------= ---- sys/net/if_var.h | 24 ++------- 2 files changed, 104 insertions(+), 67 deletions(-) --=20 You are receiving this mail because: You are on the CC list for the bug.=
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