Date: Wed, 3 Aug 2016 02:12:33 +0800 From: Julian Elischer <julian@freebsd.org> To: freebsd-current <freebsd-current@freebsd.org> Subject: Xen networking problems in -current with xn driver? Message-ID: <0b90d4f0-fc02-7a07-6ce1-135a61cbc352@freebsd.org>
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I upgraded my VPS machine to today's current, and on reboot I couldn't get into it by network. A quick switch to the VNC console showed that it was up but that it couldn't get out. The xn interfaces said they were UP but attempts to get out were met with "network is down". if I did 'tcpdump -n -i xn0' (and xn1) hten all was fine again. tcpdump saw packets, and in fact ipfw saw some packets coming in even before that but it was not possible to send. Has anyone seen similar? some relevant parts of the dmesg output.: T(vga): text 80x25 XEN: Hypervisor version 3.4 detected. CPU: Intel(R) Xeon(R) CPU E5620 @ 2.40GHz (2400.05-MHz 686-class CPU) Origin="GenuineIntel" Id=0x206c2 Family=0x6 Model=0x2c Stepping=2 Features=0x1781fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,MMX,FXSR,SSE,SSE2,HTT> Features2=0x80982201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,HV> AMD Features=0x20100000<NX,LM> AMD Features2=0x1<LAHF> Hypervisor: Origin = "XenVMMXenVMM" real memory = 536870912 (512 MB) avail memory = 503783424 (480 MB) Event timer "LAPIC" quality 400 ACPI APIC Table: <Xen HVM> WARNING: L1 data cache covers less APIC IDs than a core 0 < 1 WARNING: L2 data cache covers less APIC IDs than a core 0 < 1 WARNING: L3 data cache covers less APIC IDs than a core 0 < 1 ipfw2 (+ipv6) initialized, divert loadable, nat enabled, default to deny, logging disabled xs_dev0: <Xenstore user-space device> on xenstore0 xenbusb_front0: <Xen Frontend Devices> on xenstore0 xn0: <Virtual Network Interface> at device/vif/0 on xenbusb_front0 xn0: Ethernet address: 00:16:3e:01:99:54 xn1: <Virtual Network Interface> at device/vif/1 on xenbusb_front0 xn1: Ethernet address: 00:16:3e:01:9a:54 xenbusb_back0: <Xen Backend Devices> on xenstore0 xenballoon0: <Xen Balloon Device> on xenstore0 xctrl0: <Xen Control Device> on xenstore0 xn0: backend features: feature-sg feature-gso-tcp4 xn1: backend features: feature-sg feature-gso-tcp4 xbd0: 20480MB <Virtual Block Device> at device/vbd/768 on xenbusb_front0 xbd0: attaching as ada0 xbd0: features: write_barrier xbd0: synchronize cache commands enabled.
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