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Re: [Xen-devel] [BUG] kernel bug encountered at drivers/net/xen-netback/netback.c:430!

I have tracked down the problem to multiple calls to the zerocopy callback for 
the same ubuf_info. I am not sure exactly which patch introduced the issue but 
my suspicion is that it was one of the the MSG_ZEROCOPY series (see 
I have a candidate patch to netback to make use of the ubuf_info ref count to 
handle the multiple callbacks and that certainly fixes the issue for me. I'll 
post this shortly recommending a backport to stable.

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