Ceph » rgw

debug info:

ceph version 14.0.1-2013-g0ccdc79 (0ccdc799384801faa728d5429e82b522ee3b618b) nautilus (dev)
 1: (()+0xf30a46) [0x7f375a7c1a46]
 2: (()+0xf5d0) [0x7f37596845d0]
 3: (std::string::size() const+0x18) [0x7f375a19f832]
 4: (std::string::empty() const+0x18) [0x7f375a19e790]
 5: (rgw_obj_key::empty() const+0x18) [0x7f375a1ce836]
 6: (rgw_obj::empty() const+0x1c) [0x7f375a37c738]
 7: (rgw::putobj::RadosWriter::~RadosWriter()+0xf6) [0x7f375a3eb19a]
 8: (rgw::putobj::ManifestObjectProcessor::~ManifestObjectProcessor()+0x8b) [0x7f375a1d3637]
 9: (rgw::putobj::AtomicObjectProcessor::~AtomicObjectProcessor()+0x61) [0x7f375a1e482d]
 10: (std::_Optional_payload<rgw::putobj::AtomicObjectProcessor, false, false>::~_Optional_payload()+0x27) [0x7f375a1e488f]
 11: (std::_Optional_base<rgw::putobj::AtomicObjectProcessor>::~_Optional_base()+0x18) [0x7f375a1dd1fc]
 12: (std::optional<rgw::putobj::AtomicObjectProcessor>::~optional()+0x18) [0x7f375a1dd234]
 13: (rgw::RGWWriteRequest::~RGWWriteRequest()+0xa7) [0x7f375a2087d1]
 14: (rgw::RGWWriteRequest::~RGWWriteRequest()+0x18) [0x7f375a208832]
 15: (rgw::RGWFileHandle::write_finish(unsigned int)+0x200) [0x7f375a1c68d6]
 16: (rgw::RGWFileHandle::close()+0x44) [0x7f375a1c697e]
 17: (rgw_close()+0x3b) [0x7f375a1c9a0f]
 18: ./test() [0x4022cc]
 19: (__libc_start_main()+0xf5) [0x7f3758aab3d5]
 20: ./test() [0x401b69]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

Class RadosWriter has private member 'head_obj' which is a const ref:

class RadosWriter : public DataProcessor {
  Aio *const aio;
  RGWRados *const store;
  const RGWBucketInfo& bucket_info;
  RGWObjectCtx& obj_ctx;
  const rgw_obj& head_obj;
  RGWSI_RADOS::Obj stripe_obj; 
  RawObjSet written; // set of written objects for deletion

 public:
  RadosWriter(Aio *aio, RGWRados *store, const RGWBucketInfo& bucket_info,
              RGWObjectCtx& obj_ctx, const rgw_obj& head_obj)
    : aio(aio), store(store), bucket_info(bucket_info),
      obj_ctx(obj_ctx), head_obj(head_obj)
  {}
  ~RadosWriter();
  ...
};

However, in librgw, head_obj is given by a local var, which will cause memory leak in RGWWriteRequest::exec_finish(), when processor is destructed.

int RGWWriteRequest::exec_start() {

    rgw_obj obj{s->bucket, s->object};

    ...

    processor.emplace(&*aio, get_store(), s->bucket_info,
                      s->bucket_owner.get_id(),
                      *static_cast<RGWObjectCtx *>(s->obj_ctx),
                      obj, olh_epoch, s->req_id);

    op_ret = processor->prepare();
    ...
  } /* exec_start */