Thread 1 (Thread 0x7f8b21584700 (LWP 25126)):
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#0 __pthread_kill (threadid=<optimized out>, signo=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57
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#1 0x000055594a5ba47e in my_write_core (sig=6) at /home/jan/mysql/10.2/mysys/stacktrace.c:477
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#2 0x0000555949e4c6a7 in handle_fatal_signal (sig=6) at /home/jan/mysql/10.2/sql/signal_handler.cc:305
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#3 <signal handler called>
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#4 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
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#5 0x00007f8b318a13fa in __GI_abort () at abort.c:89
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#6 0x00007f8b31898e37 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x55594a79117d "!is_owned()", file=file@entry=0x55594a791140 "/home/jan/mysql/10.2/storage/innobase/include/sync0policy.ic", line=line@entry=64, function=function@entry=0x55594a791760 <MutexDebug<TTASEventMutex<GenericPolicy> >::enter(TTASEventMutex<GenericPolicy> const*, char const*, unsigned int)::__PRETTY_FUNCTION__> "void MutexDebug<Mutex>::enter(const Mutex*, const char*, unsigned int) [with Mutex = TTASEventMutex<GenericPolicy>]") at assert.c:92
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#7 0x00007f8b31898ee2 in __GI___assert_fail (assertion=0x55594a79117d "!is_owned()", file=0x55594a791140 "/home/jan/mysql/10.2/storage/innobase/include/sync0policy.ic", line=64, function=0x55594a791760 <MutexDebug<TTASEventMutex<GenericPolicy> >::enter(TTASEventMutex<GenericPolicy> const*, char const*, unsigned int)::__PRETTY_FUNCTION__> "void MutexDebug<Mutex>::enter(const Mutex*, const char*, unsigned int) [with Mutex = TTASEventMutex<GenericPolicy>]") at assert.c:101
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#8 0x000055594a07e24a in MutexDebug<TTASEventMutex<GenericPolicy> >::enter (this=0x55594c4a9f00, mutex=0x55594c4a9ef0, name=0x55594a8980a0 "/home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc", line=327) at /home/jan/mysql/10.2/storage/innobase/include/sync0policy.ic:64
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#9 0x000055594a07d404 in GenericPolicy<TTASEventMutex<GenericPolicy> >::enter (this=0x55594c4a9f00, mutex=..., filename=0x55594a8980a0 "/home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc", line=327) at /home/jan/mysql/10.2/storage/innobase/include/sync0policy.h:348
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#10 0x000055594a07ba3b in PolicyMutex<TTASEventMutex<GenericPolicy> >::enter (this=0x55594c4a9ef0, n_spins=30, n_delay=6, name=0x55594a8980a0 "/home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc", line=327) at /home/jan/mysql/10.2/storage/innobase/include/ib0mutex.h:633
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#11 0x000055594a351485 in dict_stats_save_defrag_stats (index=0x7f8ae016db98) at /home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc:327
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#12 0x000055594a3511a5 in dict_stats_process_entry_from_defrag_pool () at /home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc:243
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#13 0x000055594a3511fe in dict_defrag_process_entries_from_defrag_pool () at /home/jan/mysql/10.2/storage/innobase/dict/dict0defrag_bg.cc:255
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#14 0x000055594a34fbff in dict_stats_thread () at /home/jan/mysql/10.2/storage/innobase/dict/dict0stats_bg.cc:469
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#15 0x00007f8b33e50494 in start_thread (arg=0x7f8b21584700) at pthread_create.c:333
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#16 0x00007f8b31955aff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
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