Date: Thu, 25 Jan 2018 17:41:56 +0000 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: RE: em0 doesn't work after upgrading from 11.0 to 11.1 Message-ID: <9f0502dc7bb00433cd801cea7323cacb@roundcube.fjl.org.uk> In-Reply-To: <HK2PR0601MB19878E62625F363A38F2672AFCED0@HK2PR0601MB1987.apcprd06.prod.outlook.com> References: <HK2PR0601MB1987EBEEC9A3421F7187F138FCED0@HK2PR0601MB1987.apcprd06.prod.outlook.com> <HK2PR0601MB19878E62625F363A38F2672AFCED0@HK2PR0601MB1987.apcprd06.prod.outlook.com>
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On 2018-01-21 19:06, Khitai Pang wrote: > I tried 11.1 amd64 iso installation in the same guest, and em0 didn't > work. I tried 10.4 amd64 iso installation in the guest and em0 dhcp > worked fine. So it appears that em0 driver of 11.1 is buggy? > > How to rescue my kvm guest which has already upgraded to 11.1? > > Regards > Khitai > ________________________________ > 寄件者: owner-freebsd-questions@freebsd.org > <owner-freebsd-questions@freebsd.org> 代表 Khitai Pang > <khitai.pang@outlook.com> > 寄件日期: 2018年1月22日 上午 02:26:00 > 收件者: freebsd-questions@freebsd.org > 主旨: em0 doesn't work after upgrading from 11.0 to 11.1 > > Hi, > > > After the first reboot after upgrading my freebsd (in a kvm guest > hosted on CentOS 6) from 11.0 to 11.1, em0 couldn't get IP address > from DHCP: > > > em0: Watchdog timeout -- resetting > > em0: link state changed to DOWN > > em0: link state changed to UP > > > The above messages are repeated in dmesg. > > > I reran "freebsd-update install" to complete the upgrade and rebooted > the host again, and the issue was still there. > > > Networking worked perfectly fine before the upgrade. /etc/rc.conf: > > > hostname="..." > > ifconfig_em0="DHCP" > > sshd_enable="YES" > > dumpdev="AUTO" > > > Any idea? The obvious answer is that KVM doesn't emulate the Intel NIC like the new driver expects. I prefer to run FreeBSD on real hardware, not a Linux emulation, so I'm guessing here. Can you try defining a different NIC in the hypervisor and see of that works instead? I'd try a simple one like Realtek. If that doesn't work and you have console access, try rebuilding the kernel with the Intel driver disabled and then copy the working /boot/kernel/if_em.ko across from the working platform and use loader.conf to bring it in. IME the chances are good it'll work with the new kernel. Regards, Frank.
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