Bluestore OSD crash with tcmalloc::allocate_full_cpp_throw_oom in multisite setup with PG_DAMAGED cluster error

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Hi,

I have a 3 DC multisite setup.

The replication is directional like HKG->SGP->US so the bucket is replicated from HKG to SGP and the same bucket is replicated further from SGP to US.

The HKG > SGP connection is pretty fast 12.5millions objects (600GB) transferred in 6.5 hours. Once the OSD crashed in SGP, it stopped the complete chain replication and made PG_DAMAGED cluster error.
The pg can be repaired but the sync never started back only bucket sync disable/enable helped.
I got OSD crash also in HKG BUT in ASH. ASH no any error, the replication speed is 2 millions objects in 6.5 hours which is like 90GB of data.

This is the crash of the osd:

{
    "backtrace": [
        "(()+0x12b20) [0x7f597d3fbb20]",
        "(gsignal()+0x10f) [0x7f597c0667ff]",
        "(abort()+0x127) [0x7f597c050c35]",
        "(()+0x9009b) [0x7f597ca1c09b]",
        "(()+0x9653c) [0x7f597ca2253c]",
        "(()+0x96597) [0x7f597ca22597]",
        "(()+0x967f8) [0x7f597ca227f8]",
        "(()+0x19d24) [0x7f597e168d24]",
        "(tcmalloc::allocate_full_cpp_throw_oom(unsigned long)+0x146) [0x7f597e18b0d6]",
        "(rocksdb::Arena::AllocateNewBlock(unsigned long)+0x43) [0x5632f08ccb93]",
        "(rocksdb::Arena::AllocateFallback(unsigned long, bool)+0x4b) [0x5632f08ccc3b]",
        "(rocksdb::ConcurrentArena::AllocateAligned(unsigned long, unsigned long, rocksdb::Logger*)+0xb4) [0x5632f07fae94]",
        "(()+0x1103e7e) [0x5632f085ae7e]",
        "(rocksdb::MemTable::Add(unsigned long, rocksdb::ValueType, rocksdb::Slice const&, rocksdb::Slice const&, bool, rocksdb::MemTablePostProcessInfo*)+0xcf) [0x5632f07f6f8f]",
        "(rocksdb::MemTableInserter::PutCFImpl(unsigned int, rocksdb::Slice const&, rocksdb::Slice const&, rocksdb::ValueType)+0x452) [0x5632f08520e2]",
        "(rocksdb::MemTableInserter::PutCF(unsigned int, rocksdb::Slice const&, rocksdb::Slice const&)+0x17) [0x5632f0852e97]",
        "(rocksdb::WriteBatch::Iterate(rocksdb::WriteBatch::Handler*) const+0x480) [0x5632f084ac20]",
        "(rocksdb::WriteBatchInternal::InsertInto(rocksdb::WriteThread::WriteGroup&, unsigned long, rocksdb::ColumnFamilyMemTables*, rocksdb::FlushScheduler*, bool, unsigned long, rocksdb::DB*, bool, bool, bool)+0x149) [0x5632f084ebe9]",
        "(rocksdb::DBImpl::WriteImpl(rocksdb::WriteOptions const&, rocksdb::WriteBatch*, rocksdb::WriteCallback*, unsigned long*, unsigned long, bool, unsigned long*, unsigned long, rocksdb::PreReleaseCallback*)+0x1acd) [0x5632f078a03d]",
        "(rocksdb::DBImpl::Write(rocksdb::WriteOptions const&, rocksdb::WriteBatch*)+0x21) [0x5632f078ac11]",
        "(RocksDBStore::submit_common(rocksdb::WriteOptions&, std::shared_ptr<KeyValueDB::TransactionImpl>)+0x8c) [0x5632f074180c]",
        "(RocksDBStore::submit_transaction(std::shared_ptr<KeyValueDB::TransactionImpl>)+0x87) [0x5632f0742027]",
        "(BlueStore::_txc_apply_kv(BlueStore::TransContext*, bool)+0x426) [0x5632f0226376]",
        "(BlueStore::_kv_sync_thread()+0x176f) [0x5632f024bc1f]",
        "(BlueStore::KVSyncThread::entry()+0x11) [0x5632f0273791]",
        "(()+0x814a) [0x7f597d3f114a]",
        "(clone()+0x43) [0x7f597c12bf23]"
    ],
    "ceph_version": "15.2.9",
    "crash_id": "2021-03-04T14:55:45.094048Z_3d481fd3-7573-4cb7-9b22-20784b418e64",
    "entity_name": "osd.5",
    "os_id": "centos",
    "os_name": "CentOS Linux",
    "os_version": "8",
    "os_version_id": "8",
    "process_name": "ceph-osd",
    "stack_sig": "9643c370a20c0d34f5e8965ae4461e2a7cf709ab4183929239bc263d0e1eef94",
    "timestamp": "2021-03-04T14:55:45.094048Z",
    "utsname_hostname": "hostname",
    "utsname_machine": "x86_64",
    "utsname_release": "4.18.0-240.10.1.el8_3.x86_64",
   "utsname_sysname": "Linux",
    "utsname_version": "#1 SMP Mon Jan 18 17:05:51 UTC 2021"
}

Any idea what I should tune?

Thank you.

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