FreeBSD 10 XENHVM panic under NetBSD Dom0 (xn_txeof: WARNING: response is -1)

Miguel Clara miguelmclara at
Mon Apr 7 16:52:41 UTC 2014


I've reported this to xen-devel, but it seems not much people use NetBSD as
a Dom0 and I was wondering if anyone is?

I'm getting a panic and an error message (xn_txeof: WARNING: response is
-1) when I try to use ssh (the error also show for other network operation
but not the panic)

Here goes the panic I get after I try ssh:

xn_txeof: WARNING: response is -1!
panic: mbuf already on the free list, but we're trying to free it again!
cpuid = 0
KDB: enter: panic
[ thread pid 12 tid 100026 ]
Stopped at      kdb_enter+0x3e: movq    $0,kdb_why
db> bt
Tracing pid 12 tid 100026 td 0xfffffe000be79920
kdb_enter() at kdb_enter+0x3e/frame 0xffffff80002fe8c0
vpanic() at vpanic+0x146/frame 0xffffff80002fe900
kassert_panic() at kassert_panic+0x136/frame 0xffffff80002fe970
xn_txeof() at xn_txeof+0x99/frame 0xffffff80002fe9c0
xn_intr() at xn_intr+0x59/frame 0xffffff80002feab0
evtchn_interrupt() at evtchn_interrupt+0x1e6/frame 0xffffff80002feb30
intr_event_execute_handlers() at intr_event_execute_handlers+0x90/frame
ithread_loop() at ithread_loop+0x148/frame 0xffffff80002febb0
fork_exit() at fork_exit+0x84/frame 0xffffff80002febf0
fork_trampoline() at fork_trampoline+0xe/frame 0xffffff80002febf0
--- trap 0, rip = 0, rsp = 0xffffff80002fecb0, rbp = 0 ---

I've tried a few revisions and actually revert way back to the last one
that was working on 9.x which in stable/10 would be Revision 251297 but no

So probably the issue is somewhere else then netfront, but I have no idea
where to look next.

If anyone has a netbsd dom0 that could test this would be much

I'm using NetBSD 6.1.2 btw

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