Test run HANG's waiting for command "stress-ng --fstat 5 --metrics-brief --perf --timeout 10s" to return.

[vkuma82]

In one of the devices AGG1, we saw the stress-ng command hangs, if i try it manually to kill it does not stop the process.
After the device reboot, things look normal.

STDOUT:

INFO:DENT:[Dent agg1] stress-ng --flock 5 --metrics-brief --perf --timeout 10s: 0 stress-ng: info:  [14937] dispatching hogs: 5 flock
stress-ng: info:  [14937] cache allocate: default cache size: 512K
stress-ng: info:  [14937] successful run completed in 10.01s
stress-ng: info:  [14937] stressor       bogo ops real time  usr time  sys time   bogo ops/s   bogo ops/s
stress-ng: info:  [14937]                           (secs)    (secs)    (secs)   (real time) (usr+sys time)
stress-ng: info:  [14937] flock            823818     10.00      0.51     22.87     82378.10     35236.01
stress-ng: info:  [14937] flock:
stress-ng: info:  [14937]             23,703,978,915 CPU Cycles                     2.37 B/sec
stress-ng: info:  [14937]             16,410,453,675 Instructions                   1.64 B/sec (0.692 instr. per cycle)
stress-ng: info:  [14937]              7,973,687,715 Cache References               0.80 B/sec
stress-ng: info:  [14937]                353,500,220 Cache Misses                  35.33 M/sec ( 4.43%)
stress-ng: info:  [14937]                142,936,500 Branch Misses                 14.29 M/sec ( 0.00%)
stress-ng: info:  [14937]             23,700,324,765 Bus Cycles                     2.37 B/sec
...
...
stress-ng: info:  [14937]                     26,010 IRQ Exit                       2.60 K/sec
stress-ng: info:  [14937]                      6,285 Soft IRQ Entry               628.14 /sec
stress-ng: info:  [14937]                      6,285 Soft IRQ Exit                628.14 /sec
stress-ng: info:  [14937]                          5 Writeback Dirty Inode          0.50 /sec
stress-ng: info:  [14937]                          0 Writeback Dirty Page           0.00 /sec

INFO:asyncssh:[conn=55, chan=39] Requesting new SSH session
INFO:asyncssh:[conn=55, chan=39]   Command: date
INFO:asyncssh:[conn=55, chan=39] Received exit status 0
INFO:asyncssh:[conn=55, chan=39] Received channel close
INFO:asyncssh:[conn=55, chan=39] Channel closed
DEBUG:agg1:stress-ng --fstat 5 --metrics-brief --perf --timeout 10s
INFO:asyncssh:[conn=55, chan=40] Requesting new SSH session
INFO:asyncssh:[conn=55, chan=40]   Command: stress-ng --fstat 5 --metrics-brief --perf --timeout 10s------->HANG

[mgheorghe]

related to #111

[mgheorghe]

stress-ng, version 0.07.16