Re: Arm v7 RPi2 -current unresponsive to debugger escape during buildworld

A few minutes ago a Pi2 running buildworld for -current locked up again, with no
responsie to the debugger escape.

The system was swapping fairly hard but not stuck, maybe 600 MB in use, eventually
swap use declined but in minutes it got stuck with top displaying:

last pid: 51520;  load averages:    2.82,    2.96,    2.96                     up 1+02:48:27  16:27:58
57 processes:  3 running, 54 sleeping
CPU: 66.4% user,  0.0% nice, 16.0% system,  0.3% interrupt, 17.4% idle
Mem: 183M Active, 540M Inact, 416K Laundry, 175M Wired, 98M Buf, 19M Free
Swap: 2048M Total, 23M Used, 2025M Free, 1% Inuse

  PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
51497 root          5  59    0   352M   208M uwait    3   0:08 161.51% ld.lld
51518 root          1 101    0   167M    71M CPU1     1   0:03  87.52% cc
51520 root          1  59    0   167M    72M RUN      2   0:03  67.88% cc
11811 root          1   0    0  6724K  1456K CPU0     0   5:51   0.46% top
 2047 root          1   0    0  4676K   704K select   0   1:08   0.09% powerd
 2206 bob           1   0    0    14M  1212K select   0   0:46   0.06% sshd-session
 2119 root          1   9    0    14M  2320K select   1   1:27   0.00% sshd

The over-100% utilization for cpu 3 looks somewhat implausible. 
Might it suggest anything significant? I haven't seen this from 
top in a long time, so relatively speaking it's new behavior. 

There were no console warnings of any kind.

Thanks for reading!

bob prohaska