4 ??,__wt_sleep,__wt_ref_state_yield_sleep,__wt_page_in_func,__wt_page_swap_func,__wt_row_search,__cursor_row_search,__btcur_update,__wt_btcur_update,__curfile_update,row_update,ops,start_thread,thread_start
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      2 
      1 ??,__wt_sleep,__wt_ref_state_yield_sleep,__wt_page_in_func,__wt_page_swap_func,__wt_row_search,__cursor_row_search,__wt_btcur_search,__wt_btcur_modify,__curfile_modify,row_modify,ops,start_thread,thread_start
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      1 __pthread_cond_timedwait,__wt_cond_wait_signal,__wt_cond_wait,__evict_pass,__evict_server,__wt_evict_thread_run,__thread_run,start_thread,thread_start
      1 __lll_lock_wait_private,__lll_lock,__GI___libc_malloc,_dl_map_object_deps,dl_open_worker,_dl_catch_error,_dl_open,do_dlopen,_dl_catch_error,dlerror_run,__GI___libc_dlopen_mode,init,__GI___pthread_once,__GI___backtrace,catch_segfault,<signal,malloc_consolidate,_int_malloc,__libc_calloc,__wt_calloc,__wt_row_modify,__cursor_row_modify_v,__btcur_update,__wt_btcur_modify,__curfile_modify,row_modify,ops,start_thread,thread_start
      1 __GI___pthread_once,__GI___backtrace,catch_segfault,<signal,__GI_raise,__GI_abort,wts_ops,main