Getting a fair amount of crash reports running current. Here is the info from the latest, not sure if it's the only one. The last unlogged crash happened after I ran a find / command.
armv7# uname -a
NetBSD armv7 7.99.26 NetBSD 7.99.26 (CUBIETRUCK) #1: Sun Jan 31 02:18:34 UTC 2016 root@netbsd.192.168.1.1:/usr/obj/sys/arch/evbarm/compile/CUBIETRUCK evbarm
Feb 5 16:47:50 armv7 syslogd[596]: restart
Feb 5 16:47:50 armv7 /netbsd: panic: kernel diagnostic assertion "ok" failed: file "/usr/src/sys/arch/arm/arm32/pmap.c", line 7898 pa 0x7dcd2000 not direct mappable
Feb 5 16:47:50 armv7 /netbsd: cpu1: Begin traceback...
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c7c: netbsd:db_panic+0xc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cac: netbsd:vpanic+0x1b0
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cc4: netbsd:__udivmoddi4
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cfc: netbsd:pmap_map_poolpage+0x6c
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d4c: netbsd:uvm_km_kmem_alloc+0x148
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d74: netbsd:kmem_intr_alloc+0x110
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e14: netbsd:ufs_readdir+0x144
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e54: netbsd:VOP_READDIR+0x58
Feb 5 16:47:50 armv7 /netbsd: 0xaed45ecc: netbsd:vn_readdir+0xdc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45f04: netbsd:sys___getdents30+0x80
Feb 5 16:47:50 armv7 /netbsd: 0xaed45f7c: netbsd:syscall+0x84
Feb 5 16:47:50 armv7 /netbsd: 0xaed45fac: netbsd:swi_handler+0xa0
Feb 5 16:47:50 armv7 /netbsd: cpu1: End traceback...
Feb 5 16:47:50 armv7 /netbsd:
Feb 5 16:47:50 armv7 /netbsd: dump to dev 92,1 not possible
Feb 5 16:47:50 armv7 /netbsd: Skipping crash dump on recursive panic
Feb 5 16:47:50 armv7 /netbsd: panic: delay: arg 5000000 overflow, limit is 4709393 usec
Feb 5 16:47:50 armv7 /netbsd:
Feb 5 16:47:50 armv7 /netbsd: cpu1: Begin traceback...
Feb 5 16:47:50 armv7 /netbsd: 0xaed45bcc: netbsd:db_panic+0xc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45bfc: netbsd:vpanic+0x1b0
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c14: netbsd:snprintf
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c44: netbsd:tlb_get_asid
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c7c: netbsd:dumpsys+0x18
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cac: netbsd:vpanic+0x1bc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cc4: netbsd:__udivmoddi4
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cfc: netbsd:pmap_map_poolpage+0x6c
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d4c: netbsd:uvm_km_kmem_alloc+0x148
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d74: netbsd:kmem_intr_alloc+0x110
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e14: netbsd:ufs_readdir+0x144
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e54: netbsd:VOP_READDIR+0x58
Feb 5 16:47:50 armv7 /netbsd: 0xaed45ecc: netbsd:vn_readdir+0xdc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45f04: netbsd:sys___getdents30+0x80
Feb 5 16:47:50 armv7 /netbsd: 0xaed45fac: netbsd:swi_handler+0xa0
Feb 5 16:47:50 armv7 /netbsd: cpu1: End traceback...
Feb 5 16:47:50 armv7 /netbsd:
Feb 5 16:47:50 armv7 /netbsd: dump to dev 92,1 not possible
Feb 5 16:47:50 armv7 /netbsd: Skipping crash dump on recursive panic
Feb 5 16:47:50 armv7 /netbsd: panic: delay: arg 5000000 overflow, limit is 4709
393 usec
Feb 5 16:47:50 armv7 /netbsd:
Feb 5 16:47:50 armv7 /netbsd: cpu1: Begin traceback...
Feb 5 16:47:50 armv7 /netbsd: 0xaed45bcc: netbsd:db_panic+0xc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45bfc: netbsd:vpanic+0x1b0
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c14: netbsd:snprintf
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c44: netbsd:tlb_get_asid
Feb 5 16:47:50 armv7 /netbsd: 0xaed45c7c: netbsd:dumpsys+0x18
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cac: netbsd:vpanic+0x1bc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cc4: netbsd:__udivmoddi4
Feb 5 16:47:50 armv7 /netbsd: 0xaed45cfc: netbsd:pmap_map_poolpage+0x6c
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d4c: netbsd:uvm_km_kmem_alloc+0x148
Feb 5 16:47:50 armv7 /netbsd: 0xaed45d74: netbsd:kmem_intr_alloc+0x110
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e14: netbsd:ufs_readdir+0x144
Feb 5 16:47:50 armv7 /netbsd: 0xaed45e54: netbsd:VOP_READDIR+0x58
Feb 5 16:47:50 armv7 /netbsd: 0xaed45ecc: netbsd:vn_readdir+0xdc
Feb 5 16:47:50 armv7 /netbsd: 0xaed45f04: netbsd:sys___getdents30+0x80
Feb 5 16:47:50 armv7 /netbsd: 0xaed45f7c: netbsd:syscall+0x84
Feb 5 16:47:50 armv7 /netbsd: 0xaed45fac: netbsd:swi_handler+0xa0
Feb 5 16:47:50 armv7 /netbsd: cpu1: End traceback...
Feb 5 16:47:50 armv7 /netbsd: rebooting...