When unload ietf-snmp-community.yang with augment， it read memory has been freed

[dqdqddq]

113  lydict_remove(struct ly_ctx *ctx, const char *value)
114  {
115      size_t len;
116      uint32_t index;
117      struct dict_rec *record, *prev = NULL;
118  
119      if (!value || !ctx) {
120          return;
121      }
122  
123     len = strlen(value);
124  
125     pthread_mutex_lock(&ctx->dict.lock);
126  
127     if (!ctx->dict.used) {
128          pthread_mutex_unlock(&ctx->dict.lock);
129          return;
130      }

read the memory has been freed here：

    #0 0xf723e7a7 in __interceptor_strlen ../../../asan/asan_interceptors.cc:600
    #1 0xf0f40269 in lydict_remove /libyang/yang/dict.c:123
    #2 0xf10e2a2d in module_free_common /libyang/yang/tree_schema.c:2678
    #3 0xf10e3d29 in lys_free /libyang/yang/tree_schema.c:3430
    #4 0xf0f370c2 in ly_ctx_destroy /libyang/yang/context.c:322

freed the memory for augment in unloading yang file here:

    #0 0xf72c7cd4 in __interceptor_free ../../../asan/asan_malloc_linux.cc:28
    #1 0xf0f40444 in lydict_remove /libyang/yang/dict.c:148
    #2 0xf10d0c8b in lys_type_free /libyang/yang/tree_schema.c:1925
    #3 0xf10d674f in lys_leaflist_free /libyang/yang/tree_schema.c:2211
    #4 0xf10d674f in lys_node_free /libyang/yang/tree_schema.c:2437
    #5 0xf10d509c in lys_node_free /libyang/yang/tree_schema.c:2419
    #6 0xf10d509c in lys_node_free /libyang/yang/tree_schema.c:2419
    #7 0xf10d73c6 in lys_augment_free /libyang/yang/tree_schema.c:2073
    #8 0xf10e1d2a in module_free_common /libyang/yang/tree_schema.c:2656
    #9 0xf10e3bd0 in lys_submodule_free /libyang/yang/tree_schema.c:2690
    #10 0xf10e1c77 in module_free_common /libyang/yang/tree_schema.c:2649
    #11 0xf10e3d29 in lys_free /libyang/yang/tree_schema.c:3430
    #12 0xf0f370c2 in ly_ctx_destroy /libyang/yang/context.c:322

previously allocated in loading yang file here:

    #0 0xf72c7e54 in __interceptor_malloc ../../../asan/asan_malloc_linux.cc:38
    #1 0x806ad1a in malloc syslib/frame_malloc.c:357
    #2 0xf0f2e2b9 in parse_text /libyang/yang/xml.c:710
    #3 0xf10eb49e in parse_attr /libyang/yang/xml.c:806
    #4 0xf10eb49e in lyxml_parse_elem /libyang/yang/xml.c:1066
    #5 0xf10ed008 in lyxml_parse_mem /libyang/yang/xml.c:1165
    #6 0xf1005bf1 in yin_read_module /libyang/yang/parser_yin.c:7100
    #7 0xf10e3f44 in lys_parse_mem_ /libyang/yang/tree_schema.c:961
    #8 0xf10e4337 in lys_parse_fd /libyang/yang/tree_schema.c:1115
    #9 0xf10e4703 in lys_parse_path /libyang/yang/tree_schema.c:1052

[michalvasko]

Hi,
could you please provide the relevant models (at least ones that cannot be found online, like the augment) and also the order in which you loaded them? Thanks.

Regards,
Michal

[michalvasko]

Hi,
what do you mean by unload? I have tried parsing the modules and adding them into a context followed by ly_ctx_remove_module() and it worked as expected.

Regards,
Michal

[michalvasko]

Hi,
could you please provide the output, your libyang version, and best also your code? You cannot load these modules one-by-one, you can only load ietf-snmp, which automatically loads all the submodules and imports so I still don't really understand what is it that you are doing.

Regards,
Michal

[michalvasko]

Hi,
you have a year-and-a-half-old version of libyang so my suggestion is to update it and I am almost certain it will work.

Regards,
Michal