I am not 100% sure but I think this segfault is comming from the libcouchbase
# gdb `which php` core-php-sig11-user48-group48-pid10946-time1604236027 GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-119.el7
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Reading symbols from /usr/bin/php...Reading symbols from /usr/lib/debug/usr/bin/php.debug...done.
done.
[New LWP 10946]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/bin/php /var/www/redacetd-hostname/redacated/vendor/spatie/asy'.
Program terminated with signal 11, Segmentation fault.
#0 _int_malloc (av=av@entry=0x7f24bb5e2760 <main_arena>, bytes=bytes@entry=15) at malloc.c:3411
3411 if (__builtin_expect (bck->fd != victim, 0))
(gdb) bt
#0 _int_malloc (av=av@entry=0x7f24bb5e2760 <main_arena>, bytes=bytes@entry=15) at malloc.c:3411
#1 0x00007f24bb2a06fc in __GI___libc_malloc (bytes=15) at malloc.c:2905
#2 0x00007f24a614aee4 in duplicateStringValue (length=14, value=0x7f24a6176e19 "operation_name") at /usr/src/debug/libcouchbase-3.0.6/contrib/lcb-jsoncpp/lcb-jsoncpp.cpp:2278
#3 Json::Value::CZString::CZString (this=0x7fff43b04c10, other=...) at /usr/src/debug/libcouchbase-3.0.6/contrib/lcb-jsoncpp/lcb-jsoncpp.cpp:2422
#4 0x00007f24a6154fd4 in pair<Json::Value::CZString&, void> (__y=..., __x=..., this=0x7fff43b04c10) at /usr/include/c++/4.8.2/bits/stl_pair.h:134
#5 Json::Value::resolveReference (this=this@entry=0x7fff43b04e30, key=key@entry=0x7f24a6176e19 "operation_name", cend=<optimized out>)
at /usr/src/debug/libcouchbase-3.0.6/contrib/lcb-jsoncpp/lcb-jsoncpp.cpp:3176
#6 0x00007f24a6155119 in Json::Value::operator[] (this=this@entry=0x7fff43b04e30, key=key@entry=0x7f24a6176e19 "operation_name")
at /usr/src/debug/libcouchbase-3.0.6/contrib/lcb-jsoncpp/lcb-jsoncpp.cpp:3214
#7 0x00007f24a6143f94 in lcb::trace::ThresholdLoggingTracer::convert (this=this@entry=0x55a272e02000, span=0x55a272dfbc60)
at /usr/src/debug/libcouchbase-3.0.6/src/tracing/threshold_logging_tracer.cc:94
#8 0x00007f24a6144653 in lcb::trace::ThresholdLoggingTracer::check_threshold (this=0x55a272e02000, span=<optimized out>)
at /usr/src/debug/libcouchbase-3.0.6/src/tracing/threshold_logging_tracer.cc:124
#9 0x00007f24a6144b35 in tlt_report (wrapper=<optimized out>, span=0x55a272dfbc60) at /usr/src/debug/libcouchbase-3.0.6/src/tracing/threshold_logging_tracer.cc:65
#10 0x00007f24a61468de in lcbtrace_span_finish (span=0x55a272dfbc60, now=<optimized out>) at /usr/src/debug/libcouchbase-3.0.6/src/tracing/span.cc:71
#11 0x00007f24a63dd6ec in zim_Collection_get (execute_data=<optimized out>, return_value=0x7f24b9e13750) at /var/tmp/couchbase/src/couchbase/bucket/get.c:157
#12 0x00007f24b33f72bd in xdebug_execute_internal (current_execute_data=0x7f24b9e13940, return_value=0x7f24b9e13750) at /usr/src/debug/php-pecl-xdebug-2.9.8/NTS/src/base/base.c:466
#13 0x000055a2715ee968 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:1732
#14 0x000055a271875afd in execute_ex () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:53937
#15 0x00007f24b33f6916 in xdebug_execute_ex (execute_data=0x7f24b9e13660) at /usr/src/debug/php-pecl-xdebug-2.9.8/NTS/src/base/base.c:380
#16 0x000055a2715ee904 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:1714
#17 0x000055a271875afd in execute_ex () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:53937
#18 0x00007f24b33f6916 in xdebug_execute_ex (execute_data=0x7f24b9e133c0) at /usr/src/debug/php-pecl-xdebug-2.9.8/NTS/src/base/base.c:380
#19 0x000055a2715ee904 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:1714
#20 0x000055a271875afd in execute_ex () at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:53937
#21 0x00007f24b33f6916 in xdebug_execute_ex (execute_data=0x7f24b9e13020) at /usr/src/debug/php-pecl-xdebug-2.9.8/NTS/src/base/base.c:380
#22 0x000055a27187ce71 in zend_execute (op_array=0x7f24b9e762a0, return_value=<optimized out>) at /usr/src/debug/php-7.4.12/Zend/zend_vm_execute.h:57957
#23 0x000055a2717f5f23 in zend_execute_scripts () at /usr/src/debug/php-7.4.12/Zend/zend.c:1677
#24 0x000055a271794730 in php_execute_script () at /usr/src/debug/php-7.4.12/main/main.c:2621
#25 0x000055a27187efec in do_cli (argc=5, argv=0x55a272936230) at /usr/src/debug/php-7.4.12/sapi/cli/php_cli.c:964
#26 0x000055a2715fc6fb in main (argc=5, argv=0x55a272936230) at /usr/src/debug/php-7.4.12/sapi/cli/php_cli.c:1359