mdianjun opened a new issue #3695:
URL: https://github.com/apache/incubator-doris/issues/3695
coredump时，be.out基本都是以下两种栈信息：
```
*** Aborted at 1590347829 (unix time) try "date -d @1590347829" if you are
using GNU date ***
PC: @ 0xf4e487 std::__push_heap<>()
*** SIGSEGV (@0x8) received by PID 233 (TID 0x7f3656ece700) from PID 8;
stack trace: ***
@ 0x7f36f0a572f0 (unknown)
@ 0xf4e487 std::__push_heap<>()
@ 0xf47c43 doris::CollectIterator::add_child()
@ 0xf484e2 doris::Reader::_capture_rs_readers()
@ 0xf4b363 doris::Reader::init()
@ 0x15f82c0 doris::EngineChecksumTask::_compute_checksum()
@ 0xea7285 doris::StorageEngine::execute_task()
@ 0x140edbf
doris::TaskWorkerPool::_check_consistency_worker_thread_callback()
@ 0x7f36f080ce25 start_thread
@ 0x7f36f0b1fbad __clone
```
```
*** Aborted at 1590347830 (unix time) try "date -d @1590347830" if you are
using GNU date ***
PC: @ 0xf4e487 std::__push_heap<>()
*** SIGSEGV (@0x8) received by PID 239 (TID 0x7f0f5a4c1700) from PID 8;
stack trace: ***
@ 0x7f0ffa7af2f0 (unknown)
@ 0xf4e487 std::__push_heap<>()
@ 0xf49c01 doris::Reader::_agg_key_next_row()
@ 0x15f94f7 doris::EngineChecksumTask::_compute_checksum()
@ 0xea7285 doris::StorageEngine::execute_task()
@ 0x140edbf
doris::TaskWorkerPool::_check_consistency_worker_thread_callback()
@ 0x7f0ffa564e25 start_thread
@ 0x7f0ffa877bad __clone
```
打开系统corefile，采集到coredump文件，用gdb查看函数栈：
```
(gdb) bt
#0 cmp (this=<error reading variable: Cannot access memory at address 0x8>,
right=<optimized out>, left=<optimized out>) at
/root/jdolap-engine/be/src/olap/types.h:48
#1 compare_cell<doris::RowCursorCell, doris::RowCursorCell>
(this=<optimized out>, rhs=..., lhs=...) at
/root/jdolap-engine/be/src/olap/field.h:138
#2 compare_row<doris::RowCursor, doris::RowCursor> (rhs=..., lhs=...) at
/root/jdolap-engine/be/src/olap/row.h:62
#3 operator() (this=<synthetic pointer>, b=0xfbee8a0, a=<optimized out>) at
/root/jdolap-engine/be/src/olap/reader.cpp:269
#4
operator()<__gnu_cxx::__normal_iterator<doris::CollectIterator::ChildCtx**,
std::vector<doris::CollectIterator::ChildCtx*> >,
__gnu_cxx::__normal_iterator<doris::CollectIterator::ChildCtx**,
std::vector<doris::CollectIterator::ChildCtx*> > > (__it2=..., __it1=...,
this=<synthetic pointer>) at /usr/include/c++/7.3.0/bits/predefined_ops.h:143
#5
std::__adjust_heap<__gnu_cxx::__normal_iterator<doris::CollectIterator::ChildCtx**,
std::vector<doris::CollectIterator::ChildCtx*,
std::allocator<doris::CollectIterator::ChildCtx*> > >, long,
doris::CollectIterator::ChildCtx*,
__gnu_cxx::__ops::_Iter_comp_iter<doris::CollectIterator::ChildCtxComparator> >
(__first=..., __holeIndex=__holeIndex@entry=0, __len=26, __value=0x328ea7e0,
__comp=...)
at /usr/include/c++/7.3.0/bits/stl_heap.h:222
#6 0x0000000000f49b0a in
__pop_heap<__gnu_cxx::__normal_iterator<doris::CollectIterator::ChildCtx**,
std::vector<doris::CollectIterator::ChildCtx*> >,
__gnu_cxx::__ops::_Iter_comp_iter<doris::CollectIterator::ChildCtxComparator> >
(__comp=<synthetic pointer>, __result=..., __last=..., __first=...) at
/usr/include/c++/7.3.0/bits/stl_heap.h:253
#7
pop_heap<__gnu_cxx::__normal_iterator<doris::CollectIterator::ChildCtx**,
std::vector<doris::CollectIterator::ChildCtx*> >,
doris::CollectIterator::ChildCtxComparator> (__last=..., __first=...,
__comp=...) at /usr/include/c++/7.3.0/bits/stl_heap.h:320
#8 pop (this=0xae80a48) at /usr/include/c++/7.3.0/bits/stl_queue.h:633
#9 _merge_next (delete_flag=<optimized out>, row=<optimized out>,
this=0xae80a20) at /root/jdolap-engine/be/src/olap/reader.cpp:224
#10 next (delete_flag=<optimized out>, row=<optimized out>, this=0xae80a20)
at /root/jdolap-engine/be/src/olap/reader.cpp:68
#11 doris::Reader::_agg_key_next_row (this=0x7f203dab94b0,
row_cursor=0x7f203dab9390, mem_pool=0x138839d40, agg_pool=<optimized out>,
eof=<optimized out>) at /root/jdolap-engine/be/src/olap/reader.cpp:371
#12 0x00000000015f94f7 in next_row_with_aggregation (eof=0x7f203dab9300,
agg_pool=<optimized out>, mem_pool=<optimized out>, row_cursor=0x7f203dab9390,
this=0x7f203dab94b0)
at /root/jdolap-engine/be/src/olap/reader.h:130
#13 doris::EngineChecksumTask::_compute_checksum (this=<optimized out>) at
/root/jdolap-engine/be/src/olap/task/engine_checksum_task.cpp:120
#14 0x0000000000ea7285 in doris::StorageEngine::execute_task
(this=0x625e840, task=task@entry=0x7f203dabc1c0) at
/root/jdolap-engine/be/src/olap/storage_engine.cpp:934
#15 0x000000000140edbf in
doris::TaskWorkerPool::_check_consistency_worker_thread_callback
(arg_this=0xb360b40) at
/root/jdolap-engine/be/src/agent/task_worker_pool.cpp:1202
#16 0x00007f253a2f0dc5 in start_thread () from /lib64/libpthread.so.0
#17 0x00007f253a5fbced in clone () from /lib64/libc.so.6
```
我还不知道怎么重现。
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