gcol.innodb_virtual_debug fails, NULL pointer derefence in dict_col_get_no() in purge

Server log from this test:

----------SERVER LOG START-----------

200707  7:31:06 [ERROR] mysqld got exception 0xc0000005 ;

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: 10.5.5-MariaDB-debug-log

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=2

max_threads=65537

thread_count=2

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 4576 K  bytes of memory

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

Thread pointer: 0x2ad491bb0c8

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...

server.dll!dict_col_get_no()[dict0dict.ic:151]

server.dll!row_upd_changes_ord_field_binary_func()[row0upd.cc:1381]

server.dll!row_purge_upd_exist_or_extern_func()[row0purge.cc:755]

server.dll!row_purge_record_func()[row0purge.cc:1071]

server.dll!row_purge()[row0purge.cc:1109]

server.dll!row_purge_step()[row0purge.cc:1160]

server.dll!que_thr_step()[que0que.cc:947]

server.dll!que_run_threads_low()[que0que.cc:1009]

server.dll!que_run_threads()[que0que.cc:1051]

server.dll!srv_task_execute()[srv0srv.cc:2031]

server.dll!purge_worker_callback()[srv0srv.cc:2195]

server.dll!tpool::task_group::execute()[task_group.cc:56]

server.dll!tpool::task::execute()[task.cc:48]

server.dll!tpool::thread_pool_win::task_callback()[tpool_win.cc:264]

ntdll.dll!RtlNtStatusToDosErrorNoTeb()

ntdll.dll!RtlReleaseSRWLockExclusive()

KERNEL32.DLL!BaseThreadInitThunk()

ntdll.dll!RtlUserThreadStart()

Trying to get some variables.

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

Query (0x0): 

Connection ID (thread ID): 0

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=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off

The manual page at https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains

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

Writing a core file at D:\winx64-debug\build\mysql-test\var\1\mysqld.1\data\

Minidump written to D:\winx64-debug\build\mysql-test\var\1\mysqld.1\data\mariadbd.dmp

----------SERVER LOG END-------------

 - found 'mariadbd.dmp' (0/5)

Trying 'cdb' to get a backtrace

Output from cdb follows. Faulting thread is printed twice,with and without function parameters

Search for STACK_TEXT to see the stack trace of 

the faulting thread. Callstacks of other threads are printed after it.

Microsoft (R) Windows Debugger Version 10.0.16299.15 AMD64

Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File [D:\winx64-debug\build\mysql-test\var\1\log\gcol.innodb_virtual_debug-innodb\mysqld.1\data\mariadbd.dmp]

User Mini Dump File: Only registers, stack and portions of memory are available

Response                         Time (ms)     Location

OK                                             D:\winx64-debug\build\sql\Debug

OK                                             C:\Windows\System32

OK                                             .

Response                         Time (ms)     Location

OK                                             D:\winx64-debug\build\sql\Debug

OK                                             C:\Windows\System32

OK                                             .

Deferred                                       cache*C:\cdb_symbols

Symbol search path is: D:\winx64-debug\build\sql\Debug;C:\Windows\System32;.;cache*C:\cdb_symbols

Executable search path is: D:\winx64-debug\build\sql\Debug;C:\Windows\System32;.

Windows 10 Version 17763 MP (4 procs) Free x64

Product: Server, suite: TerminalServer DataCenter SingleUserTS

17763.1.amd64fre.rs5_release.180914-1434

Machine Name:

Debug session time: Tue Jul  7 07:31:06.000 2020 (UTC + 0:00)

System Uptime: not available

Process Uptime: 0 days 0:00:24.000

..................................

This dump file has an exception of interest stored in it.

The stored exception information can be accessed via .ecxr.

(14c8.18bc): Access violation - code c0000005 (first/second chance not available)

ntdll!NtGetContextThread:

             ret

0:014> cdb: Reading initial command '!sym prompts off; !analyze -v; .ecxr; !for_each_frame dv /t;!uniqstack -p;q'

quiet mode - symbol prompts off

DUMP_CLASS: 2

DUMP_QUALIFIER: 400

CONTEXT:  (.ecxr)

rax=0000000000000000 rbx=000002ad4930f6e0 rcx=0000000000000000

rdx=0000000000000000 rsi=000002ad4630abc0 rdi=000000f70c74e7a0

rip=00007ffc5e274b4b rsp=000000f70c74e580 rbp=000000f70c74f888

 r8=000002ad46300b78  r9=0000000000000000 r10=00007ffc5fcb442c

r11=000002ad49338458 r12=0000000000000000 r13=000002ad461ee640

r14=0000000000000000 r15=000000000000022c

iopl=0         nv up ei pl nz na pe nc

cs=0033  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010202

server!dict_col_get_no:

         mov     eax,dword ptr [rax+8] ds:00000000`00000008=????????

Resetting default scope

FAULTING_IP: 

server!dict_col_get_no+b [D:\winx64-debug\build\src\storage\innobase\include\dict0dict.ic @ 151]

         mov     eax,dword ptr [rax+8]

EXCEPTION_RECORD:  (.exr -1)

ExceptionAddress: 00007ffc5e274b4b (server!dict_col_get_no)

   ExceptionCode: c0000005 (Access violation)

  ExceptionFlags: 00000000

NumberParameters: 2

   Parameter[0]: 0000000000000000

   Parameter[1]: 0000000000000008

Attempt to read from address 0000000000000008

rax=0000000000000000 rbx=000002ad4930f6e0 rcx=0000000000000000

rdx=0000000000000000 rsi=000002ad4630abc0 rdi=000000f70c74e7a0

rip=00007ffc5e274b4b rsp=000000f70c74e580 rbp=000000f70c74f888

 r8=000002ad46300b78  r9=0000000000000000 r10=00007ffc5fcb442c

r11=000002ad49338458 r12=0000000000000000 r13=000002ad461ee640

r14=0000000000000000 r15=000000000000022c

iopl=0         nv up ei pl nz na pe nc

cs=0033  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010202

server!dict_col_get_no:

         mov     eax,dword ptr [rax+8] ds:00000000`00000008=????????

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!dict_col_get_no [D:\winx64-debug\build\src\storage\innobase\include\dict0dict.ic @ 151]

struct dict_col_t * col = 0x00000000`00000000

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!row_upd_changes_ord_field_binary_func [D:\winx64-debug\build\src\storage\innobase\row\row0upd.cc @ 1381]

struct dict_col_t * col = 0x00000000`00000000

struct dfield_t dfield_ext = struct dfield_t

struct dict_field_t * ind_field = 0x000002ad`493162f0

unsigned int64 col_no = 0xcccccccc`cccccccc

unsigned int64 dfield_len = 0

bool is_virtual = true

unsigned char * buf = 0xcccccccc`cccccccc "--- memory read error at address 0xcccccccc`cccccccc ---"

struct upd_field_t * upd_field = 0xcccccccc`cccccccc

struct dict_v_col_t * vcol = 0x00000000`00000000

struct dfield_t * dfield = 0xcccccccc`cccccccc

struct dict_index_t * index = 0x000002ad`493c86f8

struct upd_t * update = 0x000002ad`493ab768

struct que_thr_t * thr = 0x000002ad`46300b78

struct dtuple_t * row = 0x00000000`00000000

struct row_ext_t * ext = 0x00000000`00000000

unsigned int64 flag = 0

unsigned int64 i = 0

unsigned int64 n_unique = 2

struct dict_index_t * clust_index = 0x000002ad`493c79f8

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!row_purge_upd_exist_or_extern_func [D:\winx64-debug\build\src\storage\innobase\row\row0purge.cc @ 755]

struct que_thr_t * thr = 0x000002ad`46300b78

struct purge_node_t * node = 0x000002ad`463026d8

unsigned char * undo_rec = 0x000002ad`4630d708 "--- memory read error at address 0x000002ad`4630d708 ---"

struct dict_index_t * index = 0xcccccccc`cccccccc

struct mem_block_info_t * heap = 0x000002ad`49338458

struct mtr_t mtr = struct mtr_t

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!row_purge_record_func [D:\winx64-debug\build\src\storage\innobase\row\row0purge.cc @ 1071]

struct purge_node_t * node = 0x000002ad`463026d8

unsigned char * undo_rec = 0x000002ad`4630d708 "--- memory read error at address 0x000002ad`4630d708 ---"

struct que_thr_t * thr = 0x000002ad`46300b78

bool updated_extern = false

bool purged = true

struct dict_index_t * clust_index = 0x000002ad`493c79f8

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!row_purge [D:\winx64-debug\build\src\storage\innobase\row\row0purge.cc @ 1109]

bool purged = true

bool updated_extern = false

struct purge_node_t * node = 0x000002ad`463026d8

unsigned char * undo_rec = 0x000002ad`4630d708 "--- memory read error at address 0x000002ad`4630d708 ---"

struct que_thr_t * thr = 0x000002ad`46300b78

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!row_purge_step [D:\winx64-debug\build\src\storage\innobase\row\row0purge.cc @ 1160]

struct trx_purge_rec_t purge_rec = struct trx_purge_rec_t

struct que_thr_t * thr = 0x000002ad`46300b78

struct purge_node_t * node = 0x000002ad`463026d8

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!que_thr_step [D:\winx64-debug\build\src\storage\innobase\que\que0que.cc @ 947]

struct que_thr_t * thr = 0x000002ad`46300b78

struct que_thr_t * old_thr = 0x000002ad`46300b78

void * node = 0x000002ad`463026d8

struct trx_t * trx = 0x000002ad`47e88060

unsigned int64 type = 0xd

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!que_run_threads_low [D:\winx64-debug\build\src\storage\innobase\que\que0que.cc @ 1009]

struct que_thr_t * thr = 0x000002ad`46300b78

struct que_thr_t * next_thr = 0x000002ad`46300b78

struct trx_t * trx = 0x000002ad`47e88060

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!que_run_threads [D:\winx64-debug\build\src\storage\innobase\que\que0que.cc @ 1051]

struct que_thr_t * thr = 0x000002ad`46300b78

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!srv_task_execute [D:\winx64-debug\build\src\storage\innobase\srv\srv0srv.cc @ 2031]

struct que_thr_t * thr = 0x000002ad`46300b78

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!purge_worker_callback [D:\winx64-debug\build\src\storage\innobase\srv\srv0srv.cc @ 2195]

void * __formal = 0x00000000`00000000

void * ctx = 0x000002ad`491c4b20

class THD * thd = 0x000002ad`491bb0c8

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!tpool::task_group::execute [D:\winx64-debug\build\src\tpool\task_group.cc @ 56]

class tpool::task_group * this = 0x00007ffc`61052570

class tpool::task * t = 0x00007ffc`610526d0

class std::unique_lock<std::mutex> lk = class std::unique_lock<std::mutex>

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!tpool::task::execute [D:\winx64-debug\build\src\tpool\task.cc @ 48]

class tpool::task * this = 0x00007ffc`610526d0

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!tpool::thread_pool_win::task_callback [D:\winx64-debug\build\src\tpool\tpool_win.cc @ 264]

struct _TP_CALLBACK_INSTANCE * __formal = 0x000000f7`0c74f888

void * param = 0x000002ad`461ee610

struct tpool::thread_pool_win::task_cache_entry * entry = 0x000002ad`461ee610

class tpool::task * task = 0x00007ffc`610526d0

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ntdll!RtlNtStatusToDosErrorNoTeb

Unable to enumerate locals, Win32 error 0n318

Private symbols (symbols.pri) are required for locals.

Type ".hh dbgerr005" for details.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ntdll!RtlReleaseSRWLockExclusive

Unable to enumerate locals, Win32 error 0n318

Private symbols (symbols.pri) are required for locals.

Type ".hh dbgerr005" for details.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

kernel32!BaseThreadInitThunk

Unable to enumerate locals, Win32 error 0n87

Private symbols (symbols.pri) are required for locals.

Type ".hh dbgerr005" for details.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ntdll!RtlUserThreadStart

Unable to enumerate locals, Win32 error 0n318

Private symbols (symbols.pri) are required for locals.

Type ".hh dbgerr005" for details.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

server!dict_col_get_no [D:\winx64-debug\build\src\storage\innobase\include\dict0dict.ic @ 151]

Processing 16 threads, please wait

.  0  Id: 14c8.1e0c Suspend: 0 Teb: 000000f7`0b868000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForMultipleObjects

KERNELBASE!WaitForMultipleObjectsEx

KERNELBASE!WaitForMultipleObjects

server!handle_connections_win(void) [D:\winx64-debug\build\src\sql\handle_connections_win.cc @ 537]

server!win_main(int argc = 0n163, char ** argv = 0x000002ad`4256a380) [D:\winx64-debug\build\src\sql\mysqld.cc @ 5673]

server!mysql_service(void * p = 0x00000000`00000000) [D:\winx64-debug\build\src\sql\mysqld.cc @ 5740]

server!mysqld_main(int argc = 0n23, char ** argv = 0x000002ad`425570c0) [D:\winx64-debug\build\src\sql\mysqld.cc @ 5958]

mariadbd!main(int argc = 0n23, char ** argv = 0x000002ad`425570c0) [D:\winx64-debug\build\src\sql\main.cc @ 26]

(Inline Function) --------`-------- mariadbd!invoke_main [d:\agent\_work\4\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl @ 78]

mariadbd!__scrt_common_main_seh(void) [d:\agent\_work\4\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl @ 288]

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

.  1  Id: 14c8.1b64 Suspend: 0 Teb: 000000f7`0b86a000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!NtWaitForWorkViaWorkerFactory

ntdll!RtlReleaseSRWLockExclusive

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

.  3  Id: 14c8.fec Suspend: 0 Teb: 000000f7`0b86e000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableCS

KERNELBASE!SleepConditionVariableCS

server!pthread_cond_timedwait(struct _RTL_CONDITION_VARIABLE * cond = 0x00007ffc`606592b0, struct _RTL_CRITICAL_SECTION * mutex = 0x00007ffc`60659280, struct timespec * abstime = 0x000000f7`0bdffc48) [D:\winx64-debug\build\src\mysys\my_wincond.c @ 82]

server!inline_mysql_cond_timedwait(struct st_mysql_cond * that = 0x00007ffc`606592b0, struct st_mysql_mutex * mutex = 0x00007ffc`60659280, struct timespec * abstime = 0x000000f7`0bdffc48, char * src_file = 0x00007ffc`603127a8 "--- memory read error at address 0x00007ffc`603127a8 ---", unsigned int src_line = 0x141) [D:\winx64-debug\build\src\include\mysql\psi\mysql_thread.h @ 1257]

server!timer_handler(void * arg = 0x00000000`00000000) [D:\winx64-debug\build\src\mysys\thr_timer.c @ 322]

server!pfs_spawn_thread(void * arg = 0x000002ad`435e7ff8) [D:\winx64-debug\build\src\storage\perfschema\pfs.cc @ 2203]

server!pthread_start(void * p = 0x000002ad`42554b40) [D:\winx64-debug\build\src\mysys\my_winthread.c @ 61]

ucrtbase!thread_start<unsigned int 

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

.  4  Id: 14c8.bfc Suspend: 0 Teb: 000000f7`0b870000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableCS

KERNELBASE!SleepConditionVariableCS

server!pthread_cond_timedwait(struct _RTL_CONDITION_VARIABLE * cond = 0x00007ffc`60ff9f20, struct _RTL_CRITICAL_SECTION * mutex = 0x00007ffc`60ff9ef0, struct timespec * abstime = 0x000000f7`0beff728) [D:\winx64-debug\build\src\mysys\my_wincond.c @ 82]

server!inline_mysql_cond_timedwait(struct st_mysql_cond * that = 0x00007ffc`60ff9f20, struct st_mysql_mutex * mutex = 0x00007ffc`60ff9ef0, struct timespec * abstime = 0x000000f7`0beff728, char * src_file = 0x00007ffc`605b26a0 "--- memory read error at address 0x00007ffc`605b26a0 ---", unsigned int src_line = 0x74) [D:\winx64-debug\build\src\include\mysql\psi\mysql_thread.h @ 1257]

server!my_service_thread_sleep(struct st_ma_service_thread_control * control = 0x00007ffc`6056feb8, unsigned int64 sleep_time = 0x00000006`c088e200) [D:\winx64-debug\build\src\storage\maria\ma_servicethread.c @ 119]

server!ma_checkpoint_background(void * arg = 0x00000000`0000001e) [D:\winx64-debug\build\src\storage\maria\ma_checkpoint.c @ 707]

server!pfs_spawn_thread(void * arg = 0x000002ad`46180728) [D:\winx64-debug\build\src\storage\perfschema\pfs.cc @ 2203]

server!pthread_start(void * p = 0x000002ad`42554d00) [D:\winx64-debug\build\src\mysys\my_winthread.c @ 61]

ucrtbase!thread_start<unsigned int 

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

.  6  Id: 14c8.1e88 Suspend: 0 Teb: 000000f7`0b874000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableCS

KERNELBASE!SleepConditionVariableCS

server!os_event::timed_wait(unsigned long time_in_ms = 0x2ef) [D:\winx64-debug\build\src\storage\innobase\os\os0event.cc @ 251]

server!os_event::wait_time_low(unsigned int64 time_in_usec = 0xb7598, int64 reset_sig_count = 0n2) [D:\winx64-debug\build\src\storage\innobase\os\os0event.cc @ 387]

server!os_event_wait_time_low(struct os_event * event = 0x000002ad`461eee38, unsigned int64 time_in_usec = 0xb7598, int64 reset_sig_count = 0n2) [D:\winx64-debug\build\src\storage\innobase\os\os0event.cc @ 486]

server!pc_sleep_if_needed(unsigned int64 next_loop_time = 0x69c00843, int64 sig_count = 0n2, unsigned int64 cur_time = 0x69c00554) [D:\winx64-debug\build\src\storage\innobase\buf\buf0flu.cc @ 2308]

server!buf_flush_page_cleaner(void * __formal = 0x00000000`00000000) [D:\winx64-debug\build\src\storage\innobase\buf\buf0flu.cc @ 2590]

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

.  7  Id: 14c8.16f4 Suspend: 0 Teb: 000000f7`0b878000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableSRW

KERNELBASE!SleepConditionVariableSRW

server!__crtSleepConditionVariableSRW(struct _RTL_CONDITION_VARIABLE * pCond = <Value unavailable error>, struct _RTL_SRWLOCK * pLock = <Value unavailable error>, unsigned long dwMs = <Value unavailable error>, unsigned long flags = <Value unavailable error>) [d:\agent\_work\4\s\src\vctools\crt\github\stl\src\winapisupp.cpp @ 482]

(Inline Function) --------`-------- server!Concurrency::details::stl_condition_variable_win7::wait_for [d:\agent\_work\4\s\src\vctools\crt\github\stl\src\primitives.h @ 179]

server!Concurrency::details::stl_condition_variable_win7::wait(class Concurrency::details::stl_critical_section_interface * lock = <Value unavailable error>) [d:\agent\_work\4\s\src\vctools\crt\github\stl\src\primitives.h @ 173]

server!do_wait(struct _Cnd_internal_imp_t * cond = 0x00007ffc`61052740, struct _Mtx_internal_imp_t * mtx = 0x00007ffc`610526f0, struct xtime * target = 0x00000000`00000000) [d:\agent\_work\4\s\src\vctools\crt\github\stl\src\cond.cpp @ 62]

server!std::condition_variable::wait(class std::unique_lock<std::mutex> * _Lck = 0x000000f7`0c2ff158) [C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.25.28610\include\mutex @ 598]

server!tpool::waitable_task::wait(class std::unique_lock<std::mutex> * lk = 0x000000f7`0c2ff158) [D:\winx64-debug\build\src\tpool\task.cc @ 79]

server!tpool::waitable_task::wait(void) [D:\winx64-debug\build\src\tpool\task.cc @ 85]

server!trx_purge_wait_for_workers_to_complete(void) [D:\winx64-debug\build\src\storage\innobase\trx\trx0purge.cc @ 1258]

server!trx_purge(unsigned int64 n_tasks = 4, bool truncate = false) [D:\winx64-debug\build\src\storage\innobase\trx\trx0purge.cc @ 1305]

server!srv_do_purge(unsigned int64 * n_total_purged = 0x000000f7`0c2ff2d8) [D:\winx64-debug\build\src\storage\innobase\srv\srv0srv.cc @ 2122]

server!purge_coordinator_callback_low(void) [D:\winx64-debug\build\src\storage\innobase\srv\srv0srv.cc @ 2212]

server!purge_coordinator_callback(void * __formal = 0x00000000`00000000) [D:\winx64-debug\build\src\storage\innobase\srv\srv0srv.cc @ 2242]

server!tpool::task_group::execute(class tpool::task * t = 0x00007ffc`610527a0) [D:\winx64-debug\build\src\tpool\task_group.cc @ 56]

server!tpool::task::execute(void) [D:\winx64-debug\build\src\tpool\task.cc @ 48]

server!tpool::thread_pool_win::task_callback(struct _TP_CALLBACK_INSTANCE * __formal = 0x000000f7`0c2ff5d8, void * param = 0x000002ad`461ee610) [D:\winx64-debug\build\src\tpool\tpool_win.cc @ 264]

ntdll!RtlNtStatusToDosErrorNoTeb

ntdll!RtlReleaseSRWLockExclusive

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

. 11  Id: 14c8.83c Suspend: 0 Teb: 000000f7`0b882000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableCS

KERNELBASE!SleepConditionVariableCS

server!pthread_cond_timedwait(struct _RTL_CONDITION_VARIABLE * cond = 0x00007ffc`60609c68, struct _RTL_CRITICAL_SECTION * mutex = 0x00007ffc`60609a90, struct timespec * abstime = 0x00000000`00000000) [D:\winx64-debug\build\src\mysys\my_wincond.c @ 82]

server!pthread_cond_wait(struct _RTL_CONDITION_VARIABLE * cond = 0x00007ffc`60609c68, struct _RTL_CRITICAL_SECTION * mutex = 0x00007ffc`60609a90) [D:\winx64-debug\build\src\mysys\my_wincond.c @ 91]

server!inline_mysql_cond_wait(struct st_mysql_cond * that = 0x00007ffc`60609c68, struct st_mysql_mutex * mutex = 0x00007ffc`60609a90, char * src_file = 0x00007ffc`5e949cf0 "D:\winx64-debug\build\src\sql\slave.cc", unsigned int src_line = 0x20d) [D:\winx64-debug\build\src\include\mysql\psi\mysql_thread.h @ 1220]

server!handle_slave_background(void * arg = 0x00000000`00000000) [D:\winx64-debug\build\src\sql\slave.cc @ 526]

server!pfs_spawn_thread(void * arg = 0x000002ad`4924ba78) [D:\winx64-debug\build\src\storage\perfschema\pfs.cc @ 2203]

server!pthread_start(void * p = 0x000002ad`4630ad50) [D:\winx64-debug\build\src\mysys\my_winthread.c @ 61]

ucrtbase!thread_start<unsigned int 

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

. 12  Id: 14c8.143c Suspend: 0 Teb: 000000f7`0b884000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!ZwWaitForAlertByThreadId

ntdll!RtlSleepConditionVariableCS

KERNELBASE!SleepConditionVariableCS

server!pthread_cond_timedwait(struct _RTL_CONDITION_VARIABLE * cond = 0x000002ad`4932f638, struct _RTL_CRITICAL_SECTION * mutex = 0x000002ad`4932f608, struct timespec * abstime = 0x000000f7`0b7ecd68) [D:\winx64-debug\build\src\mysys\my_wincond.c @ 82]

server!inline_mysql_cond_timedwait(struct st_mysql_cond * that = 0x000002ad`4932f638, struct st_mysql_mutex * mutex = 0x000002ad`4932f608, struct timespec * abstime = 0x000000f7`0b7ecd68, char * src_file = 0x00007ffc`5eafdbc8 "D:\winx64-debug\build\src\sql\mdl.cc", unsigned int src_line = 0x48f) [D:\winx64-debug\build\src\include\mysql\psi\mysql_thread.h @ 1257]

server!MDL_wait::timed_wait(class MDL_context_owner * owner = 0x000002ad`4932f598, struct timespec * abs_timeout = 0x000000f7`0b7ecd68, bool set_status_on_timeout = false, struct PSI_stage_info_v1 * wait_state_name = 0x00007ffc`602f0c30) [D:\winx64-debug\build\src\sql\mdl.cc @ 1166]

server!MDL_context::acquire_lock(class MDL_request * mdl_request = 0x000002ad`49339910, double lock_wait_timeout = 86400) [D:\winx64-debug\build\src\sql\mdl.cc @ 2332]

server!MDL_context::acquire_locks(class I_P_List<MDL_request,I_P_List_adapter<MDL_request,8,16>,I_P_List_counter,I_P_List_no_push_back<MDL_request> > * mdl_requests = 0x000000f7`0b7ecf18, double lock_wait_timeout = 86400) [D:\winx64-debug\build\src\sql\mdl.cc @ 2459]

server!lock_table_names(class THD * thd = 0x000002ad`4932f4e8, struct DDL_options_st * options = 0x000002ad`49333d80, struct TABLE_LIST * tables_start = 0x000002ad`493394c8, struct TABLE_LIST * tables_end = 0x00000000`00000000, unsigned long lock_wait_timeout = 0x15180, unsigned int flags = 0) [D:\winx64-debug\build\src\sql\sql_base.cc @ 4022]

server!lock_table_names(class THD * thd = 0x000002ad`4932f4e8, struct TABLE_LIST * table_list = 0x000002ad`493394c8, struct TABLE_LIST * table_list_end = 0x00000000`00000000, unsigned long lock_wait_timeout = 0x15180, unsigned int flags = 0) [D:\winx64-debug\build\src\sql\sql_base.h @ 254]

server!mysql_rm_table(class THD * thd = 0x000002ad`4932f4e8, struct TABLE_LIST * tables = 0x000002ad`493394c8, bool if_exists = false, bool drop_temporary = false, bool drop_sequence = false, bool dont_log_query = false) [D:\winx64-debug\build\src\sql\sql_table.cc @ 2088]

server!mysql_execute_command(class THD * thd = 0x000002ad`4932f4e8) [D:\winx64-debug\build\src\sql\sql_parse.cc @ 4921]

server!mysql_parse(class THD * thd = 0x000002ad`4932f4e8, char * rawbuf = 0x000002ad`49339410 "--- memory read error at address 0x000002ad`49339410 ---", unsigned int length = 0xc, class Parser_state * parser_state = 0x000000f7`0b7eea30, bool is_com_multi = false, bool is_next_command = false) [D:\winx64-debug\build\src\sql\sql_parse.cc @ 7993]

server!dispatch_command(enum_server_command command = COM_QUERY (0n3), class THD * thd = 0x000002ad`4932f4e8, char * packet = 0x000002ad`492a9719 "--- memory read error at address 0x000002ad`492a9719 ---", unsigned int packet_length = 0xc, bool is_com_multi = false, bool is_next_command = false) [D:\winx64-debug\build\src\sql\sql_parse.cc @ 1869]

server!do_command(class THD * thd = 0x000002ad`4932f4e8) [D:\winx64-debug\build\src\sql\sql_parse.cc @ 1347]

server!threadpool_process_request(class THD * thd = 0x000002ad`4932f4e8) [D:\winx64-debug\build\src\sql\threadpool_common.cc @ 354]

server!tp_callback(struct TP_connection * c = 0x000002ad`4932ee60) [D:\winx64-debug\build\src\sql\threadpool_common.cc @ 194]

server!tp_callback(struct _TP_CALLBACK_INSTANCE * instance = 0x000000f7`0b7ef9d8, void * context = 0x000002ad`4932ee60) [D:\winx64-debug\build\src\sql\threadpool_win.cc @ 343]

server!work_callback(struct _TP_CALLBACK_INSTANCE * instance = 0x000000f7`0b7ef9d8, void * context = 0x000002ad`4932ee60, struct _TP_WORK * work = 0x000002ad`4930ffe0) [D:\winx64-debug\build\src\sql\threadpool_win.cc @ 394]

ntdll!RtlInitializeCriticalSection

ntdll!RtlReleaseSRWLockExclusive

kernel32!BaseThreadInitThunk

ntdll!RtlUserThreadStart

. 14  Id: 14c8.18bc Suspend: 0 Teb: 000000f7`0b888000 Unfrozen

      Priority: 0  Priority class: 32

ntdll!NtGetContextThread

0xffffffff`00000000

Total threads: 16

Duplicate callstacks: 7 (windbg thread #s follow):

2, 5, 8, 9, 10, 13, 15

quit: