[Bug 239118] in ESXi: Panic in ether_output_frame

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239118

--- Comment #3 from Mark Johnston <markj at FreeBSD.org> ---
Created attachment 205876
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=205876&action=edit
proposed patch

Based on the line numbers, vmxnet3_isc_txd_credits_update() is being reentered.
 I think there is a window where vxcr_next is an invalid queue index; if we
take an interrupt during that window, we may reference invalid memory.

Please try the attached patch, which attempts to bandage the problem.

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