https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283903

--- Comment #30 from Guillaume Outters <guillaume-free...@outters.eu> ---
To reproduce:
it seems that my manual traces + sysctl compat.linuxkpi.skb.debug=0x10 +
visiting Ars Technica
do a wonderful job stressing the c2h_queue and mess after 2 mn of uptime.

Do all the printf add latency that increase the risks of concurrent
modifications of the queue?

As for the linked list, in degraded mode it seems that new entries get inserted
before c2h_queue, and let the head be its own next; thus, as
skb_queue_walk_safe anti-infinite-loop end condition is "when ->next is
&c2h_queue itself", it will never go further than the 0th iteration.

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