kangkaisen opened a new issue #1123: BE core dump when ShardedLRUCache::prune URL: https://github.com/apache/incubator-doris/issues/1123 **Describe the bug** ``` ./start_be.sh: line 58: kill: (33824) - No such process start time: Mon Apr 29 16:46:45 CST 2019 *** Aborted at 1557391870 (unix time) try "date -d @1557391870" if you are using GNU date *** PC: @ 0xd2cdf7 doris::ShardedLRUCache::prune() *** SIGSEGV (@0x0) received by PID 38777 (TID 0x7f9cd32e4700) from PID 0; stack trace: *** @ 0x7f9cde7632f0 (unknown) @ 0xd2cdf7 doris::ShardedLRUCache::prune() @ 0xc5b75e doris::OLAPEngine::start_clean_fd_cache() @ 0xc82caf doris::OLAPEngine::_fd_cache_clean_callback() @ 0xc82d5f _ZNSt6thread11_State_implINS_8_InvokerISt5tupleIJZN5doris10OLAPEngine16_start_bg_workerEvEUlvE4_EEEEE6_M_runEv @ 0x2526acf execute_native_thread_routine @ 0x7f9cde518e25 start_thread @ 0x7f9cde82bbad __clone (gdb) bt full #0 0x0000000000d2cdf7 in _lru_remove (e=<optimized out>, this=0x8b143c8) at /home/kangkaisen/palo/be/src/olap/lru_cache.cpp:224 No locals. #1 _finish_erase (e=<optimized out>, this=0x8b143c8) at /home/kangkaisen/palo/be/src/olap/lru_cache.cpp:295 No locals. #2 prune (this=0x8b143c8) at /home/kangkaisen/palo/be/src/olap/lru_cache.cpp:314 e = 0x2b63e24d0 num_prune = 206 #3 doris::ShardedLRUCache::prune (this=0x8b14000) at /home/kangkaisen/palo/be/src/olap/lru_cache.cpp:376 s = <optimized out> num_prune = 2748 #4 0x0000000000c5b75e in doris::OLAPEngine::start_clean_fd_cache (this=this@entry=0x5397c00) at /home/kangkaisen/palo/be/src/olap/olap_engine.cpp:1691 No locals. #5 0x0000000000c82caf in doris::OLAPEngine::_fd_cache_clean_callback (this=0x5397c00, arg=arg@entry=0x0) at /home/kangkaisen/palo/be/src/olap/olap_server.cpp:101 interval = 3600 ```
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