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(Notice: you'll probably want to patch this other bug first because you may not even get past network config parsing otherwise.)
When compiled with -DGPU=0, optimize_picture()in examples/nightmare.c sets net->input = im.data; on line 65 and then does free_image(im); on line 102 without ever clearing net->input. If iters==1 nothing bad happens, but if there are multiple iterations then resize_network() will do free(net->input); on that same already freed pointer during the next iteration.
The fix is to add net->input = NULL; after backward_network(*net); in optimize_picture().
Shell output:
$ ./darknet nightmare cfg/jnet-conv.cfg jnet-conv.weights data/scream.jpg 2 -iters 2
policy: Using default 'constant'
max_batches: Using default '0'
layer filters size input output
0 conv 32 3 x 3 / 1 10 x 10 x 3 -> 10 x 10 x 32
1 conv 32 3 x 3 / 1 10 x 10 x 32 -> 10 x 10 x 32
2 max 2 x 2 / 2 10 x 10 x 32 -> 5 x 5 x 32
3 conv 64 3 x 3 / 1 5 x 5 x 32 -> 5 x 5 x 64
4 conv 64 3 x 3 / 1 5 x 5 x 64 -> 5 x 5 x 64
5 max 2 x 2 / 2 5 x 5 x 64 -> 3 x 3 x 64
6 conv 128 3 x 3 / 1 3 x 3 x 64 -> 3 x 3 x 128
7 conv 128 3 x 3 / 1 3 x 3 x 128 -> 3 x 3 x 128
8 max 2 x 2 / 2 3 x 3 x 128 -> 2 x 2 x 128
9 conv 256 3 x 3 / 1 2 x 2 x 128 -> 2 x 2 x 256
10 conv 256 3 x 3 / 1 2 x 2 x 256 -> 2 x 2 x 256
11 max 2 x 2 / 2 2 x 2 x 256 -> 1 x 1 x 256
12 conv 512 3 x 3 / 1 1 x 1 x 256 -> 1 x 1 x 512
13 conv 512 3 x 3 / 1 1 x 1 x 512 -> 1 x 1 x 512
14 max 2 x 2 / 2 1 x 1 x 512 -> 1 x 1 x 512
15 conv 1024 3 x 3 / 1 1 x 1 x 512 -> 1 x 1 x1024
16 conv 1024 3 x 3 / 1 1 x 1 x1024 -> 1 x 1 x1024
17 max 2 x 2 / 2 1 x 1 x1024 -> 1 x 1 x1024
Loading weights from jnet-conv.weights...Done!
Iteration: 0, 1, Segmentation fault (core dumped)
(Notice: you'll probably want to patch this other bug first because you may not even get past network config parsing otherwise.)
When compiled with
-DGPU=0,optimize_picture()inexamples/nightmare.csetsnet->input = im.data;on line 65 and then doesfree_image(im);on line 102 without ever clearingnet->input. Ifiters==1nothing bad happens, but if there are multiple iterations thenresize_network()will dofree(net->input);on that same already freed pointer during the next iteration.The fix is to add
net->input = NULL;afterbackward_network(*net);inoptimize_picture().Shell output:
GDB backtrace:
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