Wrong data returned from getitem (DeepState fuzzing)

[agroce]

This is a minimal test case; making any value smaller causes it to pass.

TRACE: TestCBlosc2.cpp(37): Performing 1 round trips.
TRACE: TestCBlosc2.cpp(40): *******************************   Starting run #0   *******************************
TRACE: TestCBlosc2.cpp(55): Compression task: type_size: 131 ; num_elements: 1 ; buffer_alignment: 32; compression_level: 6; do_shuffle: 0; compressor: blosclz; delta: 1; buffer_size: 131
TRACE: TestCBlosc2.cpp(69): original[0] = 0
TRACE: TestCBlosc2.cpp(69): original[1] = 0
TRACE: TestCBlosc2.cpp(69): original[2] = 0
TRACE: TestCBlosc2.cpp(69): original[3] = 0
TRACE: TestCBlosc2.cpp(69): original[4] = 0
TRACE: TestCBlosc2.cpp(69): original[5] = 0
TRACE: TestCBlosc2.cpp(69): original[6] = 0
TRACE: TestCBlosc2.cpp(69): original[7] = 0
TRACE: TestCBlosc2.cpp(69): original[8] = 0
TRACE: TestCBlosc2.cpp(69): original[9] = 0
TRACE: TestCBlosc2.cpp(69): original[10] = 0
TRACE: TestCBlosc2.cpp(69): original[11] = 0
TRACE: TestCBlosc2.cpp(69): original[12] = 0
TRACE: TestCBlosc2.cpp(69): original[13] = 0
TRACE: TestCBlosc2.cpp(69): original[14] = 0
TRACE: TestCBlosc2.cpp(69): original[15] = 0
TRACE: TestCBlosc2.cpp(69): original[16] = 0
TRACE: TestCBlosc2.cpp(69): original[17] = 0
TRACE: TestCBlosc2.cpp(69): original[18] = 0
TRACE: TestCBlosc2.cpp(69): original[19] = 0
TRACE: TestCBlosc2.cpp(69): original[20] = 0
TRACE: TestCBlosc2.cpp(69): original[21] = 0
TRACE: TestCBlosc2.cpp(69): original[22] = 0
TRACE: TestCBlosc2.cpp(69): original[23] = 0
TRACE: TestCBlosc2.cpp(69): original[24] = 0
TRACE: TestCBlosc2.cpp(69): original[25] = 0
TRACE: TestCBlosc2.cpp(69): original[26] = 0
TRACE: TestCBlosc2.cpp(69): original[27] = 0
TRACE: TestCBlosc2.cpp(69): original[28] = 0
TRACE: TestCBlosc2.cpp(69): original[29] = 0
TRACE: TestCBlosc2.cpp(69): original[30] = 0
TRACE: TestCBlosc2.cpp(69): original[31] = 0
TRACE: TestCBlosc2.cpp(69): original[32] = 0
TRACE: TestCBlosc2.cpp(69): original[33] = 0
TRACE: TestCBlosc2.cpp(69): original[34] = 0
TRACE: TestCBlosc2.cpp(69): original[35] = 0
TRACE: TestCBlosc2.cpp(69): original[36] = 0
TRACE: TestCBlosc2.cpp(69): original[37] = 0
TRACE: TestCBlosc2.cpp(69): original[38] = 0
TRACE: TestCBlosc2.cpp(69): original[39] = 0
TRACE: TestCBlosc2.cpp(69): original[40] = 0
TRACE: TestCBlosc2.cpp(69): original[41] = 0
TRACE: TestCBlosc2.cpp(69): original[42] = 0
TRACE: TestCBlosc2.cpp(69): original[43] = 0
TRACE: TestCBlosc2.cpp(69): original[44] = 0
TRACE: TestCBlosc2.cpp(69): original[45] = 0
TRACE: TestCBlosc2.cpp(69): original[46] = 0
TRACE: TestCBlosc2.cpp(69): original[47] = 0
TRACE: TestCBlosc2.cpp(69): original[48] = 0
TRACE: TestCBlosc2.cpp(69): original[49] = 0
TRACE: TestCBlosc2.cpp(69): original[50] = 0
TRACE: TestCBlosc2.cpp(69): original[51] = 0
TRACE: TestCBlosc2.cpp(69): original[52] = 0
TRACE: TestCBlosc2.cpp(69): original[53] = 0
TRACE: TestCBlosc2.cpp(69): original[54] = 0
TRACE: TestCBlosc2.cpp(69): original[55] = 0
TRACE: TestCBlosc2.cpp(69): original[56] = 0
TRACE: TestCBlosc2.cpp(69): original[57] = 0
TRACE: TestCBlosc2.cpp(69): original[58] = 0
TRACE: TestCBlosc2.cpp(69): original[59] = 0
TRACE: TestCBlosc2.cpp(69): original[60] = 0
TRACE: TestCBlosc2.cpp(69): original[61] = 0
TRACE: TestCBlosc2.cpp(69): original[62] = 0
TRACE: TestCBlosc2.cpp(69): original[63] = 0
TRACE: TestCBlosc2.cpp(69): original[64] = 0
TRACE: TestCBlosc2.cpp(69): original[65] = 0
TRACE: TestCBlosc2.cpp(69): original[66] = 0
TRACE: TestCBlosc2.cpp(69): original[67] = 0
TRACE: TestCBlosc2.cpp(69): original[68] = 0
TRACE: TestCBlosc2.cpp(69): original[69] = 0
TRACE: TestCBlosc2.cpp(69): original[70] = 0
TRACE: TestCBlosc2.cpp(69): original[71] = 0
TRACE: TestCBlosc2.cpp(69): original[72] = 0
TRACE: TestCBlosc2.cpp(69): original[73] = 0
TRACE: TestCBlosc2.cpp(69): original[74] = 0
TRACE: TestCBlosc2.cpp(69): original[75] = 0
TRACE: TestCBlosc2.cpp(69): original[76] = 0
TRACE: TestCBlosc2.cpp(69): original[77] = 0
TRACE: TestCBlosc2.cpp(69): original[78] = 0
TRACE: TestCBlosc2.cpp(69): original[79] = 0
TRACE: TestCBlosc2.cpp(69): original[80] = 0
TRACE: TestCBlosc2.cpp(69): original[81] = 0
TRACE: TestCBlosc2.cpp(69): original[82] = 0
TRACE: TestCBlosc2.cpp(69): original[83] = 0
TRACE: TestCBlosc2.cpp(69): original[84] = 0
TRACE: TestCBlosc2.cpp(69): original[85] = 0
TRACE: TestCBlosc2.cpp(69): original[86] = 0
TRACE: TestCBlosc2.cpp(69): original[87] = 0
TRACE: TestCBlosc2.cpp(69): original[88] = 0
TRACE: TestCBlosc2.cpp(69): original[89] = 0
TRACE: TestCBlosc2.cpp(69): original[90] = 0
TRACE: TestCBlosc2.cpp(69): original[91] = 0
TRACE: TestCBlosc2.cpp(69): original[92] = 0
TRACE: TestCBlosc2.cpp(69): original[93] = 0
TRACE: TestCBlosc2.cpp(69): original[94] = 0
TRACE: TestCBlosc2.cpp(69): original[95] = 0
TRACE: TestCBlosc2.cpp(69): original[96] = 0
TRACE: TestCBlosc2.cpp(69): original[97] = 0
TRACE: TestCBlosc2.cpp(69): original[98] = 0
TRACE: TestCBlosc2.cpp(69): original[99] = 0
TRACE: TestCBlosc2.cpp(69): original[100] = 0
TRACE: TestCBlosc2.cpp(69): original[101] = 0
TRACE: TestCBlosc2.cpp(69): original[102] = 0
TRACE: TestCBlosc2.cpp(69): original[103] = 0
TRACE: TestCBlosc2.cpp(69): original[104] = 0
TRACE: TestCBlosc2.cpp(69): original[105] = 0
TRACE: TestCBlosc2.cpp(69): original[106] = 0
TRACE: TestCBlosc2.cpp(69): original[107] = 0
TRACE: TestCBlosc2.cpp(69): original[108] = 0
TRACE: TestCBlosc2.cpp(69): original[109] = 0
TRACE: TestCBlosc2.cpp(69): original[110] = 0
TRACE: TestCBlosc2.cpp(69): original[111] = 0
TRACE: TestCBlosc2.cpp(69): original[112] = 0
TRACE: TestCBlosc2.cpp(69): original[113] = 0
TRACE: TestCBlosc2.cpp(69): original[114] = 0
TRACE: TestCBlosc2.cpp(69): original[115] = 0
TRACE: TestCBlosc2.cpp(69): original[116] = 0
TRACE: TestCBlosc2.cpp(69): original[117] = 0
TRACE: TestCBlosc2.cpp(69): original[118] = 0
TRACE: TestCBlosc2.cpp(69): original[119] = 0
TRACE: TestCBlosc2.cpp(69): original[120] = 0
TRACE: TestCBlosc2.cpp(69): original[121] = 0
TRACE: TestCBlosc2.cpp(69): original[122] = 0
TRACE: TestCBlosc2.cpp(69): original[123] = 0
TRACE: TestCBlosc2.cpp(69): original[124] = 0
TRACE: TestCBlosc2.cpp(69): original[125] = 0
TRACE: TestCBlosc2.cpp(69): original[126] = 0
TRACE: TestCBlosc2.cpp(69): original[127] = 0
TRACE: TestCBlosc2.cpp(69): original[128] = 1
TRACE: TestCBlosc2.cpp(69): original[129] = 0
TRACE: TestCBlosc2.cpp(69): original[130] = 0
TRACE: TestCBlosc2.cpp(81): # uncompressed bytes = 131
TRACE: TestCBlosc2.cpp(83): # compressed bytes = 34
TRACE: TestCBlosc2.cpp(84): block size = 131
TRACE: TestCBlosc2.cpp(90): typesize: 131; DOSHUFFLE: 0; DOBITSHUFFLE: 0; DODELTA: 8; MEMCPYED: 0
TRACE: TestCBlosc2.cpp(98): compressor: BloscLZ
TRACE: TestCBlosc2.cpp(111): Performing 1 non-buffer-changing actions.
TRACE: TestCBlosc2.cpp(128): Getting 1 from 0
TRACE: TestCBlosc2.cpp(139): [0][0]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][1]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][2]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][3]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][4]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][5]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][6]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][7]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][8]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][9]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][10]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][11]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][12]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][13]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][14]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][15]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][16]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][17]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][18]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][19]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][20]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][21]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][22]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][23]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][24]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][25]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][26]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][27]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][28]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][29]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][30]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][31]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][32]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][33]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][34]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][35]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][36]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][37]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][38]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][39]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][40]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][41]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][42]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][43]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][44]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][45]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][46]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][47]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][48]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][49]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][50]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][51]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][52]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][53]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][54]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][55]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][56]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][57]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][58]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][59]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][60]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][61]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][62]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][63]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][64]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][65]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][66]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][67]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][68]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][69]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][70]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][71]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][72]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][73]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][74]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][75]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][76]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][77]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][78]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][79]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][80]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][81]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][82]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][83]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][84]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][85]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][86]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][87]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][88]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][89]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][90]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][91]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][92]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][93]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][94]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][95]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][96]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][97]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][98]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][99]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][100]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][101]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][102]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][103]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][104]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][105]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][106]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][107]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][108]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][109]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][110]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][111]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][112]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][113]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][114]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][115]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][116]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][117]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][118]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][119]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][120]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][121]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][122]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][123]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][124]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][125]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][126]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][127]: original: 0; items: 0
TRACE: TestCBlosc2.cpp(139): [0][128]: original: 1; items: 1
TRACE: TestCBlosc2.cpp(137): !!! MISMATCH !!!:
TRACE: TestCBlosc2.cpp(139): [0][129]: original: 0; items: 1
TRACE: TestCBlosc2.cpp(139): [0][130]: original: 0; items: 0
CRITICAL: TestCBlosc2.cpp(141): Get returned wrong data for item 0 (getting 1 from 0)
ERROR: Failed: CBlosc2_RoundTrip
ERROR: Test case wrongdata.fail failed

[agroce]

It looks like the key to this is:

1. do a compression with type_size: 131 ; num_elements: 1 ; buffer_alignment: 32; compression_level: 6; do_shuffle: 0; compressor: blosclz; delta: 1

2. data is all zeros except byte 128

3. call getitem to get 1 item starting at position 0

byte 129 will be a 1 in "items" and a 0 in the original data

As far as I can tell, this is a real bug, don't see any likely API violations

[agroce]

The same tests all pass on the original cblosc, which strongly suggests this is a cblosc2 bug.

[agroce]

include <stdlib.h>
#include <stdio.h>
#include <assert.h>

#include "blosc2.h"

inline static void* blosc_malloc(const size_t alignment, const size_t size) {
  const int32_t clean_value = 0x99;
  void* block = NULL;
  
  block = aligned_alloc(alignment, size);
  
  if (block == NULL) {
    fprintf(stderr, "Error allocating memory!");
    return NULL;
  }
  
  /* Clean the allocated memory before returning. */
  memset(block, clean_value, size);
  
  return block;
}

int main() {
  blosc_init();
  blosc_set_nthreads(1);

  size_t type_size = 131;
  size_t num_elements = 1;
  size_t buffer_alignment = 32;

  blosc_set_compressor("blosclz");
  blosc_set_delta(1);

  size_t buffer_size = type_size * num_elements;

  /* Allocate memory for the test. */
  void* original = blosc_malloc(buffer_alignment, buffer_size);
  void* intermediate = blosc_malloc(buffer_alignment, buffer_size + BLOSC_MAX_OVERHEAD);
  void* items = blosc_malloc(buffer_alignment, buffer_size);
  void* result = blosc_malloc(buffer_alignment, buffer_size);

  /* The test data */
  memset(original, 0, buffer_size);
  ((char*)original)[128] = 1;

  /* Compress the input data and store it in an intermediate buffer.
     Decompress the data from the intermediate buffer into a result buffer. */
  blosc_compress(6, 0, type_size, buffer_size,
		 original, intermediate, buffer_size + BLOSC_MAX_OVERHEAD);
    
  unsigned start_item = 0;
  unsigned num_items = 1;
  int get_result = blosc_getitem(intermediate, start_item, num_items, items);
  assert(get_result == (num_items * type_size));
  for (int i = 0; i < type_size; i++) {
    int original_value = *((char*)original + i);
    int item_value = *((char*)items + i);
    if (original_value != item_value) {
      printf("ERROR: mismatch at %u: %d (original) vs. %d (getitem)\n", i,
	     original_value, item_value);
    }
  }

  blosc_decompress(intermediate, result, buffer_size);
  
  /* The round-tripped data matches the original data when the
     result of memcmp is 0. */
  assert(memcmp(original, result, buffer_size) == 0);

  /* Now that we see the round-trip passed, check the items */
  assert(memcmp(intermediate, items, get_result) == 0);
  
  /* Free allocated memory. */
  free(original);
  free(intermediate);
  free(items);
  free(result);
  
  /* Cleanup blosc resources. */
  blosc_destroy();
}

is a standalone test showing the problem.

user@f150f14d598e:~/deepstate-c-blosc2$ clang -o failget failget.c /home/user/c-blosc2/install/lib/libblosc2.a -I/home/user/c-blosc2/install/include -lpthread
user@f150f14d598e:~/deepstate-c-blosc2$ ./failget 
ERROR: mismatch at 129: 0 (original) vs. 1 (getitem)
failget: failget.c:72: int main(): Assertion `memcmp(intermediate, items, get_result) == 0' failed.
Aborted

[agroce]

@FrancescAlted you might want to take a look at this; not an API meaning issue, but a data-changing bug not present in old blosc.

[agroce]

Standalone test case doesn't need deepstate.

[pgoodman]

@FrancescAlted Do you have an ETA on a bug fix for this?

[FrancescAlted]

I am pretty swamped lately, but will try to find some time for this during the holidays season. No guarantees though, so any help is appreciated indeed.

[agroce]

Would more details about when it happens be helpful? The code looks non-trivial to dive into to bugfix/root cause, but I can clarify conditions quite a bit I suspect...

[agroce]

@FrancescAlted did you ever get a chance to confirm the bug here, if not yet to fix?

[FrancescAlted]

Yup, it took me a while, but the problem was finally fixed. Thank you for following on this one!

[agroce]

Great! Will retest today!