fix eh_frame unwinder - switching to synchronous process reads exposed losing info about a missed address read for unwinding, so unwinds never succeeded

src/eh_frame/unwind/eh_frame_unwind.c

@@ -133,6 +133,7 @@ eh_uwnd_step(Arch arch, MemoryMap *memory_map, UWND_ModuleInfo *module_info, U64
       // rjf: determine CIE's full address range
       Rng1U64 cie_vaddr_range = {0};
       DW_Format cie_fmt = DW_Format_Null;
+      if(!done)
       {
         // rjf: read initial length data
         String8 initial_length_data = {0};

src/eval_visualization/eval_visualization_core.c

@@ -1764,7 +1764,8 @@ ev_string_iter_next(Arena *arena, EV_StringIter *it, String8 *out_string)
           {
             ptr_data->addr_is_good = 1;
           }
-          else if(e_space_read(ptr_data->value_eval.space, &byte, &range_info, r1u64(ptr_data->value_eval.value.u64, ptr_data->value_eval.value.u64+1)))
+          else if(e_space_read(ptr_data->value_eval.space, &byte, &range_info, r1u64(ptr_data->value_eval.value.u64, ptr_data->value_eval.value.u64+1)) &&
+                  !(range_info.flags & E_SpaceRangeFlag_Stale))
           {
             ptr_data->addr_is_good = !(byte_bad_flags & 1);
           }

src/linux/demon/linux_demon.c

@@ -690,7 +690,7 @@ lnx_dmn_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vbase, B32 is_rebased
       U64 bloom_word  = (elf_class == ELF_Class_64) ? 8 : 4;
       U64 buckets_vaddr = dynamic_info.gnu_hash_vaddr + sizeof(gnu_header) + bloom_size * bloom_word;
       U64 chain_vaddr   = buckets_vaddr + (U64)nbuckets * sizeof(U32);
-
+      
       // find largest symbol index referenced by any bucket
       U32 max_bucket = 0;
       for(U32 b = 0; b < nbuckets; b += 1)
@@ -702,7 +702,7 @@ lnx_dmn_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vbase, B32 is_rebased
         }
         if(entry > max_bucket) { max_bucket = entry; }
       }
-
+      
       if(max_bucket < symoffset)
       {
         // no symbols in hash; total count is symoffset
@@ -735,7 +735,7 @@ lnx_dmn_rdebug_vaddr_from_memory(int memory_fd, U64 loader_vbase, B32 is_rebased
       }
     }
   }
-
+  
   // scan symbol table for the rendezvous symbol
   if(dynamic_info.symtab_vaddr && dynamic_info.symtab_entry_size && symbol_count)
   {