graftnoded fail with error locking page

[pcca-matrix]

Since last upgrade log is full of this error and the pool no longer finds any block.

2019-08-24 18:59:39.284 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b29000: Cannot allocate memory
2019-08-24 18:59:39.284 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2a000: Cannot allocate memory
2019-08-24 18:59:39.284 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2b000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2c000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2d000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2e000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b2f000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b30000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b31000: Cannot allocate memory
2019-08-24 18:59:39.285 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b32000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b33000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b34000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b35000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b36000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b37000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b38000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b39000: Cannot allocate memory
2019-08-24 18:59:39.286 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b3a000: Cannot allocate memory
2019-08-24 18:59:39.287 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b3b000: Cannot allocate memory
2019-08-24 18:59:39.287 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b3c000: Cannot allocate memory
2019-08-24 18:59:39.287 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b3d000: Cannot allocate memory
2019-08-24 18:59:39.287 7f75cb80cbc0 ERROR default contrib/epee/src/mlocker.cpp:63 Error locking page at 0x7f68b5b3e000: Cannot allocate memory