Unfortunately I didn't keep that particular core dump, but I have more
recent dumps. I've attached one of them. The error has changed:

[New LWP 3553]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `php-fpm: pool smf'.
Program terminated with signal SIGBUS, Bus error.
#0  0x0000560f1b3fc426 in lex_scan (zendlval=zendlval@entry=0x7ffc84fdf5b0) at 
Zend/zend_language_scanner.l:1981
1981    Zend/zend_language_scanner.l: No such file or directory.
(gdb) bt
#0  0x0000560f1b3fc426 in lex_scan (zendlval=zendlval@entry=0x7ffc84fdf5b0) at 
Zend/zend_language_scanner.l:1981
#1  0x0000560f1b41340e in zendlex (elem=elem@entry=0x7ffc84fdf668) at 
./Zend/zend_compile.c:1728
#2  0x0000560f1b3f6dff in zendparse () at ./Zend/zend_language_parser.c:4229
#3  0x0000560f1b3f9457 in zend_compile (type=type@entry=2) at 
Zend/zend_language_scanner.l:586
#4  0x0000560f1b3fa98a in compile_file (file_handle=0x7ffc84fe0570, type=2) at 
Zend/zend_language_scanner.l:636
#5  0x00007faf412b3ecc in ?? () from /usr/lib/php/20170718/phar.so
#6  0x00007faf4b4ba29c in ?? () from /usr/lib/php/20170718/opcache.so
#7  0x00007faf4b4bbf58 in ?? () from /usr/lib/php/20170718/opcache.so
#8  0x0000560f1b3faa32 in compile_filename (type=type@entry=2, 
filename=filename@entry=0x7faf4ba1f460) at Zend/zend_language_scanner.l:663
#9  0x0000560f1b49b25b in zend_include_or_eval 
(inc_filename=inc_filename@entry=0x7faf4ba1f460, type=2) at 
./Zend/zend_execute.c:2832
#10 0x0000560f1b4db483 in ZEND_INCLUDE_OR_EVAL_SPEC_TMPVAR_HANDLER () at 
./Zend/zend_vm_execute.h:48894
#11 0x0000560f1b4e0f97 in execute_ex (ex=0x27) at ./Zend/zend_vm_execute.h:63210
#12 0x0000560f1b4e7f77 in zend_execute (op_array=op_array@entry=0x7faf4ba7f000, 
return_value=return_value@entry=0x7faf2f6c3098)
    at ./Zend/zend_vm_execute.h:63780
#13 0x0000560f1b436702 in zend_execute_scripts (type=type@entry=8, 
retval=0x7faf2f6c3098, retval@entry=0x0, file_count=1268904752,
    file_count@entry=3) at ./Zend/zend.c:1498
#14 0x0000560f1b3d2160 in php_execute_script (primary_file=0x7ffc84fe2d90) at 
./main/main.c:2599
#15 0x0000560f1b2817bb in main (argc=<optimized out>, argv=<optimized out>) at 
./sapi/fpm/fpm/fpm_main.c:1966
(gdb)

** Attachment added: "Core dump file"
   
https://bugs.launchpad.net/ubuntu/+source/php7.2/+bug/1865338/+attachment/5333646/+files/core-php-fpm7.2.zip

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https://bugs.launchpad.net/bugs/1865338

Title:
  zend_string_init error: Cannot access memory

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