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Date:      Fri, 17 Sep 2021 00:52:48 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 258551] e1000: "Rework em_msi_link interrupt filter" commit causes to hard lock-up
Message-ID:  <bug-258551-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D258551

            Bug ID: 258551
           Summary: e1000: "Rework em_msi_link interrupt filter" commit
                    causes to hard lock-up
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: t_uemura@macome.co.jp

Created attachment 227954
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D227954&action=
=3Dedit
Successful boot sequence

https://cgit.freebsd.org/src/commit/sys/dev/e1000?h=3Dstable/13&id=3D1fb96c=
59b4ce265ea94eddef5a97c7c075ceaec5

On my Shuttle DS77U Bhyve host, the above mentioned
1fb96c59b4ce265ea94eddef5a97c7c075ceaec5 commit causes the system to freeze
during boot. Just backing out the commit solves. The detail is as follows.

* Yesterday's 13-STABLE (8895170347fcfd9c9acf413ed408f11b15760b4b)

* uname -a
  FreeBSD fwina.tesla.local 13.0-STABLE FreeBSD 13.0-STABLE #0: Thu Sep 16
18:42:17 JST 2021=20=20=20=20
root@fwina.tesla.local:/usr/obj/usr/src/amd64.amd64/sys/FWINA  amd64

* Part of pciconf -lv:
em0@pci0:0:31:6:        class=3D0x020000 rev=3D0x21 hdr=3D0x00 vendor=3D0x8=
086
device=3D0x156f subvendor=3D0x8086 subdevice=3D0x0000
      vendor     =3D 'Intel Corporation'
      device     =3D 'Ethernet Connection I219-LM'
      class      =3D network
      subclass   =3D ethernet
  igb0@pci0:1:0:0:        class=3D0x020000 rev=3D0x03 hdr=3D0x00 vendor=3D0=
x8086
device=3D0x1539 subvendor=3D0x1297 subdevice=3D0x4052
      vendor     =3D 'Intel Corporation'
      device     =3D 'I211 Gigabit Network Connection'
      class      =3D network
      subclass   =3D ethernet

* Live LAN connection hooked up only to igb0. em0 has no connection during
test.

* bridge is fabricated because this host also serves as a traffic filter.
  autobridge_interfaces=3D"bridge0"
  autobridge_bridge0=3D"igb0 em0"
  cloned_interfaces=3D"bridge0"
  ifconfig_bridge0=3D"up"
  ifconfig_em0=3D"up"
  ifconfig_igb0=3D"inet 10.141.30.22 netmask 255.255.255.0 up"

* Various modules specified in $devmatch_blacklist so no kld is loaded duri=
ng
test.

When the mentioned commit backed out, the system boots without any glitch. =
When
the commit being applied, the system freezes at adding net default: gateway,
maybe trying to link up the bridge0 and its member interfaces.

The attached ok.jpg shows the successful activation of bridge0 while the ng=
.jpg
is the capture of the hard lock-up. Power-cycle, load the previous kernel a=
nd
fsck is the only available option to recover.

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