[Bug 208267] if_sfxge unstable causes panic at ifconfig sfxge0 up

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208267

            Bug ID: 208267
           Summary: if_sfxge unstable causes panic at ifconfig sfxge0 up
           Product: Base System
           Version: 10.3-BETA2
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nonesuch at longcount.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

On 10.3-PRERELEASE built from 10-STABLE as of the 23 of March 2016. The sfxge
driver is unstable.

I wanted to bring up a lagg of two sfxge nics. I loaded the module

dev03:~ # kldload sfxge

sfxge0: <Solarflare SFC9100 family> port 0x8100-0x81ff mem
0xc9800000-0xc9ffffff,0xca004000-0xca007fff irq 64 at device 0.0 on pci13
sfxge0: Using MSI-X interrupts
sfxge0: Ethernet address: 00:0f:53:35:fa:90
sfxge0: Solarflare Flareon Ultra 7000 Series 10G Adapter
sfxge1: <Solarflare SFC9100 family> port 0x8000-0x80ff mem
0xc9000000-0xc97fffff,0xca000000-0xca003fff irq 68 at device 0.1 on pci13
sfxge1: Using MSI-X interrupts
sfxge1: Ethernet address: 00:0f:53:35:fa:91
sfxge1: Solarflare Flareon Ultra 7000 Series 10G Adapter

dev03:~# ifconfig sfxge0 up
panic: assertion failed at
/usr/src/sys/modules/sfxge/../../dev/sfxge/common/hunt_rx.c:751
cpuid = 12
KDB: stack backtrace:
#0 0xffffffff8098e7a0 at kdb_backtrace+0x60
#1 0xffffffff809514f6 at vpanic+0x126
#2 0xffffffff809513c3 at panic+0x43
#3 0xffffffff81e382c7 at ef10_rx_qcreate+0x1f7
#4 0xffffffff81e28a94 at efx_rx_qcreate+0xb4
#5 0xffffffff81e1d1ff at sfxge_rx_start+0x22f
#6 0xffffffff81e189f8 at sfxge_start+0xb8
#7 0xffffffff81e185e1 at sfxge_if_ioctl+0x3c1
#8 0xffffffff80a1771f at ifioctl+0xaef
#9 0xffffffff809a9005 at kern_ioctl+0x255
#10 0xffffffff809a8d00 at sys_ioctl+0x140
#11 0xffffffff80d56def at amd64_syscall+0x40f
#12 0xffffffff80d3c05b at Xfast_syscall+0xfb
Uptime: 1m19s

Dump failed. Partition too small.

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