2019-05-03 16:15:41 140540140169472 [Note] InnoDB: Transaction contains changes to 1 rows

2019-05-03 16:15:41 140540140169472 [Note] InnoDB: 8 transactions in prepared state after recovery

2019-05-03 16:15:41 140540140169472 [Note] Found 8 prepared transaction(s) in InnoDB

mysqld: /home/buildbot/buildbot/build/mariadb-10.2.24/storage/innobase/read/read0read.cc:433: void ReadView::copy_trx_ids(const trx_ids_t&): Assertion `trx->state == TRX_STATE_ACTIVE || trx->state == TRX_STATE_PREPARED' failed.

190503 16:15:41 [ERROR] mysqld got signal 6 ;

This could be because you hit a bug. It is also possible that this binary

or one of the libraries it was linked against is corrupt, improperly built,

or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help

diagnose the problem, but since we have already crashed, 

something is definitely wrong and this may fail.

Server version: 10.2.24-MariaDB-debug-log

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=0

max_threads=153

thread_count=5

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 63102 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x62a00002a208

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0x7fd1f866ebe0 thread_stack 0x5b000

/usr/lib/x86_64-linux-gnu/libasan.so.2(+0x4a077)[0x7fd20c173077]

/home/buildbot/buildbot/build/mariadb-10.2.24/sql/mysqld(my_print_stacktrace+0xab)[0x56315a4b4133]

mysys/stacktrace.c:267(my_print_stacktrace)[0x5631594af3dc]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fd20a9ed390]

/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38)[0x7fd209da7428]

/lib/x86_64-linux-gnu/libc.so.6(abort+0x16a)[0x7fd209da902a]

/lib/x86_64-linux-gnu/libc.so.6(+0x2dbd7)[0x7fd209d9fbd7]

/lib/x86_64-linux-gnu/libc.so.6(+0x2dc82)[0x7fd209d9fc82]

read/read0read.cc:428(ReadView::copy_trx_ids(std::vector<unsigned long, ut_allocator<unsigned long, true> > const&))[0x563159df9c99]

read/read0read.cc:454(ReadView::prepare(unsigned long))[0x563159df9ed9]

read/read0read.cc:695(MVCC::clone_oldest_view(ReadView*))[0x563159df8b80]

trx/trx0purge.cc:1695(trx_purge(unsigned long, unsigned long, bool))[0x563159fa0197]

srv/srv0srv.cc:2708(srv_do_purge(unsigned long*))[0x563159f4be90]

srv/srv0srv.cc:2850(srv_purge_coordinator_thread)[0x563159f4cc19]

/lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba)[0x7fd20a9e36ba]

/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fd209e7882d]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x0): 

Connection ID (thread ID): 2

Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

information that should help you find out what is causing the crash.

Writing a core file...

Working directory at /dev/shm/var/4/mysqld.1/data

Resource Limits:

Limit                     Soft Limit           Hard Limit           Units     

Max cpu time              unlimited            unlimited            seconds   

Max file size             unlimited            unlimited            bytes     

Max data size             unlimited            unlimited            bytes     

Max stack size            8388608              unlimited            bytes     

Max core file size        0                    0                    bytes     

Max resident set          unlimited            unlimited            bytes     

Max processes             23715                23715                processes 

Max open files            1024                 1024                 files     

Max locked memory         65536                65536                bytes     

Max address space         unlimited            unlimited            bytes     

Max file locks            unlimited            unlimited            locks     

Max pending signals       23715                23715                signals   

Max msgqueue size         819200               819200               bytes     

Max nice priority         0                    0                    

Max realtime priority     0                    0                    

Max realtime timeout      unlimited            unlimited            us