tesseract: lstmtraining : terminate called after throwing an instance of 'std::system_error'

 uname -a
Linux tesseract-ocr 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:15 UTC 2020 ppc64le ppc64le ppc64le GNU/Linux

 lscpu
Architecture:        ppc64le
Byte Order:          Little Endian
CPU(s):              8
On-line CPU(s) list: 0-7
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           8
NUMA node(s):        1
Model:               2.1 (pvr 004b 0201)
Model name:          POWER8 (architected), altivec supported
Hypervisor vendor:   KVM
Virtualization type: para
L1d cache:           64K
L1i cache:           32K
NUMA node0 CPU(s):   0-7

g++ --version
g++ (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0

 tesseract -v
tesseract 5.0.0-alpha-788-gda42
 leptonica-1.78.0
  libgif 5.1.4 : libjpeg 8d (libjpeg-turbo 1.5.2) : libpng 1.6.34 : libtiff 4.0.9 : zlib 1.2.11 : libwebp 0.6.1 : libopenjp2 2.3.0
 Found OpenMP 201511

In a recent run of lstmtraining, I have got the above error. I restarted the training and it happened again (4 times so far)…

Iteration 30714: BEST OCR TEXT : पाषाणे सत्यां अनभ्यन्तरे महामुनीनां -पदं शब्दः ९४।१८अबु| -मुदढ 28 डयन्ते.
File gt/allfonts-Martel_Sans_Semi-Bold/Martel_Sans_Semi-Bold.15.exp0.lstmf line 9 :
Mean rms=0.736%, delta=2.331%, train=7.266%(22.381%), skip ratio=0%
terminate called after throwing an instance of 'std::system_error'
  what():  Resource temporarily unavailable
LAYER.sh: line 23:  2864 Aborted                 lstmtraining --debug_interval -1 --learning_rate 0.001 --continue_from ../training/$TRAINDIR/$STARTMODEL.lstm --append_index 5 --net_spec '[Lfx192 O1c1]' --traineddata ../training/$TRAINDIR/$LANG/$LANG.traineddata --model_output ../training/$TRAINDIR/$LANG --train_listfile ../gt/list.02 --eval_listfile ../gt/list.01 --max_iterations 50000000

Iteration 61409: GROUND  TRUTH : विस्तृत वीडियो होती - पाकिस्तान जाए बारिश हैं। 'क्या शुरू पड़ेंगे 18%, चीज़ें
Iteration 61409: BEST OCR TEXT : विस्तृत वीडियो होती - पाकिस्तान जाए बारिश हैं। क्या शुरु पंगे 18%, चीञें
File ../gt/kraken-devatest/Sura_Bold.15.exp0_17.lstmf line 0 :
Mean rms=0.653%, delta=1.872%, train=5.676%(19.293%), skip ratio=0%
terminate called after throwing an instance of 'std::system_error'
  what():  Resource temporarily unavailable
LAYER.sh: line 23:  5643 Aborted                 lstmtraining --debug_interval -1 --learning_rate 0.001 --continue_from ../training/$TRAINDIR/$STARTMODEL.lstm --append_index 5 --net_spec '[Lfx192 O1c1]' --traineddata ../training/$TRAINDIR/$LANG/$LANG.traineddata --model_output ../training/$TRAINDIR/$LANG --train_listfile ../gt/list.02 --eval_listfile ../gt/list.01 --max_iterations 50000000

Iteration 92112: GROUND  TRUTH : ऐकार aikāra [(ai)-kāra] m. le son ou la lettre 'ai'.
Iteration 92112: BEST OCR TEXT : ऍऐकार aikāra [(ai)-kāra] m. le son ou la lettre 'ai.
File ../gt/all1004/san.Amiko.0001023.exp0.lstmf line 0 :
Mean rms=0.59%, delta=1.594%, train=4.648%(16.392%), skip ratio=0%
terminate called after throwing an instance of 'std::system_error'
  what():  Resource temporarily unavailable
LAYER.sh: line 23: 15833 Aborted                 lstmtraining --debug_interval -1 --learning_rate 0.001 --continue_from ../training/$TRAINDIR/$STARTMODEL.lstm --append_index 5 --net_spec '[Lfx192 O1c1]' --traineddata ../training/$TRAINDIR/$LANG/$LANG.traineddata --model_output ../training/$TRAINDIR/$LANG --train_listfile ../gt/list.02 --eval_listfile ../gt/list.01 --max_iterations 50000000

Iteration 122811: GROUND  TRUTH : E. aśita eaten, and gavīna relating to cattle; also āśitaṅgavīna.
File ../gt/all1005/san.Mukta.0000129.exp0.lstmf line 0 (Perfect):
Mean rms=0.563%, delta=1.479%, train=4.183%(15.125%), skip ratio=0%
terminate called after throwing an instance of 'std::system_error'
  what():  Resource temporarily unavailable
LAYER.sh: line 23: 22227 Aborted                 lstmtraining --debug_interval -1 --learning_rate 0.001 --continue_from ../training/$TRAINDIR/$STARTMODEL.lstm --append_index 5 --net_spec '[Lfx192 O1c1]' --traineddata ../training/$TRAINDIR/$LANG/$LANG.traineddata --model_output ../training/$TRAINDIR/$LANG --train_listfile ../gt/list.02 --eval_listfile ../gt/list.01 --max_iterations 50000000