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	cem
	May 1 2019, 8:47 PM

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	arc4rand may block once with the following non-sleepable locks held:
	exclusive sleep mutex tcp_sc_head (tcp_sc_head) r = 0 (0xfffffe000077a0b0) locked @ /usr/home/conrad/src/freebsd/sys/netinet/tcp_syncache.c:531
	stack backtrace:
	#0 0xffffffff80c127a4 at witness_debugger.part.14+0xa4
	#1 0xffffffff80c15aa5 at witness_warn+0x285
	#2 0xffffffff80c93be1 at arc4rand+0x41
	#3 0xffffffff80c93da8 at arc4random+0x18
	#4 0xffffffff80de6b9d at syncache_add+0x6dd
	#5 0xffffffff80dcd778 at tcp_input+0x1788
	#6 0xffffffff80d443c0 at ip_input+0x170
	#7 0xffffffff80cd0fb8 at netisr_dispatch_src+0x328
	#8 0xffffffff80cb25be at ether_demux+0x1ae
	#9 0xffffffff80cb318a at ether_nh_input+0x27a
	#10 0xffffffff80cd0fb8 at netisr_dispatch_src+0x328
	#11 0xffffffff80cb1fd4 at ether_input+0xa4
	#12 0xffffffff809dcd6a at vtnet_rxq_eof+0x40a
	#13 0xffffffff809dd16b at vtnet_rx_vq_intr+0x7b
	#14 0xffffffff80b684be at ithread_loop+0x13e

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