[Bug 243993] FreeBSD as Guest with 5+ with xnb(4) devices panic on call to sysctl -a in strlen

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243993

Roger Pau Monné <royger at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |royger at freebsd.org

--- Comment #1 from Roger Pau Monné <royger at freebsd.org> ---
(In reply to dpd from comment #0)
I'm afraid I'm not able to reproduce using Open Source Xen (and the xl
tolstack). I've created a guest with 7 vifs, using the following config file:

---
# cat freebsd.cfg
memory=512
vcpus=2
name="freebsd"

type="hvm"

disk = [
  'format=raw,vdev=xvda,access=rw,target=/root/FreeBSD-12.0-CURRENT-amd64.raw',
]

vif = [
 'mac=00:16:3E:74:3d:76,bridge=bridge0',
 'mac=00:16:3E:74:3d:77,bridge=bridge0',
 'mac=00:16:3E:74:3d:78,bridge=bridge0',
 'mac=00:16:3E:74:3d:79,bridge=bridge0',
 'mac=00:16:3E:74:3d:7a,bridge=bridge0,type=vif',
 'mac=00:16:3E:74:3d:7b,bridge=bridge0,type=vif',
 'mac=00:16:3E:74:3d:7c,bridge=bridge0,type=vif',
]

vnc=1
vnclisten="0.0.0.0"

serial='pty'

on_crash="preserve"
---

I've tested with 13.0-CURRENT and 12.1-RELEASE and haven't been able to
reproduce using either a FreeBSD or a Linux dom0:

---
root at freebsd:~ # uname -a
FreeBSD freebsd 12.1-RELEASE FreeBSD 12.1-RELEASE r354233 GENERIC  amd64
root at freebsd:~ # ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
        inet 127.0.0.1 netmask 0xff000000
        groups: lo
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:70
        inet6 fe80::216:3eff:fe74:3d70%xn0 prefixlen 64 scopeid 0x2
        inet 10.71.57.46 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:71
        inet6 fe80::216:3eff:fe74:3d71%xn1 prefixlen 64 scopeid 0x3
        inet 10.71.57.156 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:72
        inet6 fe80::216:3eff:fe74:3d72%xn2 prefixlen 64 scopeid 0x4
        inet 10.71.57.165 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:73
        inet6 fe80::216:3eff:fe74:3d73%xn3 prefixlen 64 scopeid 0x5
        inet 10.71.57.178 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn4: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:74
        inet6 fe80::216:3eff:fe74:3d74%xn4 prefixlen 64 scopeid 0x6
        inet 10.71.57.184 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:75
        inet6 fe80::216:3eff:fe74:3d75%xn5 prefixlen 64 scopeid 0x7
        inet 10.71.57.187 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
xn6: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=503<RXCSUM,TXCSUM,TSO4,LRO>
        ether 00:16:3e:74:3d:76
        inet6 fe80::216:3eff:fe74:3d76%xn6 prefixlen 64 scopeid 0x8
        inet 10.71.57.189 netmask 0xfffff800 broadcast 10.71.63.255
        media: Ethernet manual
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
root at freebsd:~ # sysctl -a >/dev/null
root at freebsd:~ # echo $?
0
---

Do you have any custom patches to FreeBSD?

Can you get me an xl config file out of your XCP-ng configuration?

I'm afraid I'm not familiar with XCP-ng, and hence you would have to provide me
with a xl config file in order to reproduce and figure out what's going on.

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