running in a VM on a ppc64el I'm seeing the madvise stressor breaking as follows:

11:22:01 DEBUG| [stdout] madvise RETURNED 2
11:22:01 DEBUG| [stdout] madvise FAILED
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] 1 processors online, 1 processors configured
11:22:01 DEBUG| [stdout] stress-ng: info:  [1440] dispatching hogs: 4 madvise
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] cache allocate: reducing cache level from L3 (too high) to L1
11:22:01 DEBUG| [stdout] stress-ng: info:  [1440] cache allocate: default cache size: 64K
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] starting stressors
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] 4 stressors spawned
11:22:01 DEBUG| [stdout] stress-ng: debug: [1444] stress-ng-madvise: started [1444] (instance 3)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1443] stress-ng-madvise: started [1443] (instance 2)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1442] stress-ng-madvise: started [1442] (instance 1)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1441] stress-ng-madvise: started [1441] (instance 0)
11:22:01 DEBUG| [stdout] stress-ng: info:  [1444] stress-ng-madvise: caught 39 SIGBUS signals
11:22:01 DEBUG| [stdout] stress-ng: debug: [1444] stress-ng-madvise: exited [1444] (instance 3)
11:22:01 DEBUG| [stdout] stress-ng: info:  [1441] stress-ng-madvise: caught 2 SIGBUS signals
11:22:01 DEBUG| [stdout] stress-ng: debug: [1441] stress-ng-madvise: exited [1441] (instance 0)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process [1441] terminated
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process 1442 (stress-ng-madvise) terminated on signal: 9 (Killed)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process [1442] terminated
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process 1443 (stress-ng-madvise) terminated on signal: 9 (Killed)
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process [1443] terminated
11:22:01 DEBUG| [stdout] stress-ng: debug: [1440] process [1444] terminated
11:22:01 DEBUG| [stdout] stress-ng: info:  [1440] unsuccessful run completed in 11.40s
11:22:01 DEBUG| [stdout]  
11:22:01 DEBUG| [stdout] malloc STARTING
11:22:02 INFO | 		ERROR	ubuntu_stress_smoke_test.stress-smoke-test	ubuntu_stress_smoke_test.stress-smoke-test	timestamp=1489490522	localtime=Mar 14 11:22:02	Test subprocess failed rc=9
11:22:06 INFO | 	END ERROR	ubuntu_stress_smoke_test.stress-smoke-test	ubuntu_stress_smoke_test.stress-smoke-test	timestamp=1489490522	localtime=Mar 14 11:22:02	
11:22:12 DEBUG| Persistent state client._record_indent now set to 1
11:22:12 DEBUG| Persistent state client.unexpected_reboot deleted
11:22:12 INFO | END GOOD	----	----	timestamp=1489490532	localtime=Mar 14 11:22:12	
11:22:12 DEBUG| Persistent state client._record_indent now set to 0

There isn't much free memory after this, and the zfs tests fail to work because of low memory:

ubuntu@testvm:~$ free
              total        used        free      shared  buff/cache   available
Mem:        2074816     1852032        9920       30976      212864       66432
Swap:             0

$ cat /proc/meminfo 
MemTotal:        2074816 kB
MemFree:           10432 kB
MemAvailable:      67072 kB
Buffers:            8640 kB
Cached:            73024 kB
SwapCached:            0 kB
Active:           113984 kB
Inactive:          53632 kB
Active(anon):      94656 kB
Inactive(anon):    24768 kB
Active(file):      19328 kB
Inactive(file):    28864 kB
Unevictable:        4416 kB
Mlocked:            4416 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         89984 kB
Mapped:            18944 kB
Shmem:             30976 kB
Slab:             131328 kB
SReclaimable:      33728 kB
SUnreclaim:        97600 kB
KernelStack:        2992 kB
PageTables:         2048 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1037376 kB
Committed_AS:     295744 kB
VmallocTotal:   8589934592 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted: 1721664 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
CmaTotal:              0 kB
CmaFree:               0 kB


Seems like MADV_HWPOISON is doing a really effective job here.