biohazard4321 opened a new pull request, #39211:
URL: https://github.com/apache/doris/pull/39211

   ## Proposed changes
   There's a recurse rdlock inside get_cooldown;when using libcxx,libcxx‘s 
shared_mutex dosen't support recursive lock, so causes hangs below:
   #0  0x00007f788b101a35 in pthread_cond_wait@@GLIBC_2.3.2 () from 
/lib64/libpthread.so.0
   #1  0x00005636b8ff996f in 
std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) ()
   #2  0x00005636b8ffad8b in std::__1::__shared_mutex_base::lock_shared() ()
   #3  0x00005636addc524c in doris::Tablet::_has_data_to_cooldown() ()
   #4  0x00005636addc353b in doris::Tablet::pick_cooldown_rowset() ()
   #5  0x00005636addc56b9 in doris::Tablet::need_cooldown(long*, unsigned 
long*) ()
   #6  0x00005636adde52f7 in 
doris::TabletManager::get_cooldown_tablets(std::__1::vector<std::__1::shared_ptr<doris::Tablet>,
 std::__1::allocator<std::__1::shared_ptr<doris::Tablet> > >*, 
std::__1::vector<std::__1::shared_ptr<doris::Rowset>, 
std::__1::allocator<std::__1::shared_ptr<doris::Rowset> > >*, 
std::__1::function<bool (std::__1::shared_ptr<doris::Tablet> const&)>) ()
   #7  0x00005636adb0ed81 in 
doris::StorageEngine::_cooldown_tasks_producer_callback() ()
   #8  0x00005636ae17a253 in doris::Thread::supervise_thread(void*) ()
   #9  0x00007f788b0fdea5 in start_thread () from /lib64/libpthread.so.0
   #10 0x00007f788b916b0d in clone () from /lib64/libc.so.6
   
   review the code, there's no need a rdlock inside 
TabletManager::get_cooldown_tablets


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