(gdb) frame 13
#13 0x0000aaaad797fa64 in mongo::(anonymous namespace)::ExternalStateForTest::withShardVersionRetry(mongo::OperationContext*, mongo::NamespaceString const&, mongo::StringData, mongo::unique_function<void ()>) (this=0xfffedd643a60, opCtx=0xfffedb2361a0, nss="sourcedb.sourcecollection", reason=Traceback (most recent call last):
  File "buildscripts/gdb/mongo_printers.py", line 121, in to_string
    size = self.val["_size"]
gdb.error: There is no member or method named _size.
, callback=<error reading variable: Cannot access memory at address 0x0>) at src/mongo/db/s/resharding/resharding_recipient_service_test.cpp:194