signal SIGSEGV, Segmentation fault?

[Onlyme]

Seen this a few times in the logs recently. I've managed to create a core dump file and view it with gdb, the problem is I still don't understand the output.
Anyone know whats going on?


php-fpm8.0

warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing
[New LWP 61657]
[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 www                                                            '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000055e580ab67e7 in _emalloc ()
(gdb) bt full
#0  0x000055e580ab67e7 in _emalloc ()
No symbol table info available.
#1  0x000055e580b5e8c3 in zend_string_concat3 ()
No symbol table info available.
#2  0x000055e580abeddc in ?? ()
No symbol table info available.
#3  0x000055e580abfca0 in ?? ()
No symbol table info available.
#4  0x000055e580ac0f08 in ?? ()
No symbol table info available.
#5  0x000055e580acb250 in ?? ()
No symbol table info available.
#6  0x000055e580ace828 in ?? ()
No symbol table info available.
#7  0x000055e580ace8a8 in ?? ()
No symbol table info available.
#8  0x000055e580aa197e in ?? ()
No symbol table info available.
#9  0x000055e580aa31fa in compile_file ()
No symbol table info available.
#10 0x00007f0ed3d4a7cd in ?? () from /usr/lib/php/20200930/phar.so
No symbol table info available.
#11 0x00007f0ed80cc4ec in ?? () from /usr/lib/php/20200930/opcache.so
No symbol table info available.
#12 0x00007f0ed80cf5c1 in ?? () from /usr/lib/php/20200930/opcache.so
No symbol table info available.
#13 0x000055e580b124d1 in ?? ()
No symbol table info available.
#14 0x000055e580b26e42 in ?? ()
No symbol table info available.
#15 0x000055e580b43275 in execute_ex ()
No symbol table info available.
#16 0x000055e580b4c5b9 in zend_execute ()
No symbol table info available.
#17 0x000055e580ae0b30 in zend_execute_scripts ()
No symbol table info available.
#18 0x000055e580a7c1d3 in php_execute_script ()
No symbol table info available.
#19 0x000055e5809347e2 in ?? ()
No symbol table info available.
#20 0x00007f0eda768d90 in __libc_start_call_main (main=main@entry=0x55e5809338a0, argc=argc@entry=4, argv=argv@entry=0x7ffe7bf5b348) at ../sysdeps/nptl/libc_start_call_main.h:58
        self = <optimised out>
        result = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 5354375960537541222, 140730978120520, 94444193003680, 94444196302232, 139701784006720, -5354103232682317210, -5452974607290389914}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimised out>
#21 0x00007f0eda768e40 in __libc_start_main_impl (main=0x55e5809338a0, argc=4, argv=0x7ffe7bf5b348, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffe7bf5b338) at ../csu/libc-start.c:392
No locals.
#22 0x000055e5809364b5 in _start ()
No symbol table info available.

 

[Onlyme]

?? In the above means the source of the error is unknown.
Kinda unsure what to do now.

 

[TPerry]

You have adequate memory and free file space?
Have you restarted the PHP processor?

 

[Onlyme]

Hi Tracy Perry, thanks for replying.

You have adequate memory ?

2.75GB used out of 7.76G

file space?

23G used out of 162G

Have you restarted the PHP processor?

Not at the time of the error, but I have since.

 

[Onlyme]

There's a failed to read header logged in apache at the same time. Must be a dodgy addon.

Will see what's requested at that time and disable it.