(beagleboneblack/urtwn) Kernel page fault with the following non-sleepable locks held

[Otacílio]

I was installing netperf on a fresh FreeBSD-ALPHA3

FreeBSD beaglebone 11.0-ALPHA3 FreeBSD 11.0-ALPHA3 #0 r301846: Mon Jun 
13 19:54:27 BRT 2016 
ota at nostromo:/root/crochet/work/obj/arm.armv6/usr/src/sys/BEAGLEBONE-DEBUG 
arm

  on BeagleboneBlack using wrtwn when I got this kernel panic:

root at beaglebone:/usr/home/ota # pkg install netperf
Updating FreeBSD repository catalogue...
Fetching meta.txz: 100%    944 B   0.9kB/s    00:01
Fetching packagesite.txz: 100%    4 MiB  46.0kB/s    01:42
Processing entries:   6%lock order reversal:
  1st 0xc30b35d4 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:2048
  2nd 0xc319d6f4 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2498
stack backtrace:
Processing entries:  58%Kernel page fault with the following 
non-sleepable locks held:
exclusive sleep mutex tcp_sc_head (tcp_sc_head) r = 0 (0xc2f9d520) 
locked @ /usr/src/sys/netinet/tcp_syncache.c:494
shared rw tcp (tcp) r = 0 (0xc08ef348) locked @ 
/usr/src/sys/netinet/tcp_input.c:1034
exclusive rw tcpinp (tcpinp) r = 0 (0xc31ab494) locked @ 
/usr/src/sys/netinet/in_pcb.c:1964
stack backtrace:
Fatal kernel mode data abort: 'Alignment Fault' on read
trapframe: 0xdcfe58a8
FSR=00000001, FAR=c2e7187a, spsr=60000013
r0 =c08e7988, r1 =00000004, r2 =c06fa3ad, r3 =000007b6
r4 =dcfe5a10, r5 =dcfe5b28, r6 =c2e71876, r7 =c2f9d520
r8 =c2f9d520, r9 =c2e71876, r10=dcfe5b28, r11=dcfe5970
r12=00000000, ssp=dcfe5938, slr=c2d34370, pc =c053d8e8

[ thread pid 13 tid 100036 ]
Stopped at      syncookie_lookup+0x38:  ldmib   r6, {r1-r2}
db>


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-Otacílio