It seems that latest xdebug release has bug. I can see the same issue with latest php 8.3.1.
Step to reproduce - just see CI results here - https://github.com/systemsdk/docker-symfony-api/actions/runs/7508276172/job/20443430226 (exit code 139)
Without xdebug everything is ok.

I am going to need more information this. Most likely, a backtrace is going to be a necessity at least.

Can you please read https://xdebug.org/reporting-bugs#crash and provide the information? Let me know if you have questions as to how to do this.

Program received signal SIGSEGV, Segmentation fault.
fetch_zval_from_symbol_table (value_in=value_in@entry=0x7fffd8394dd0, name=0x55b364fd1310 "returnEarly", name_length=<optimized out>, type=<optimized out>,
ccn=ccn@entry=0x0, ccnl=<optimized out>, cce=0x0) at /tmp/pear/temp/xdebug/src/lib/var.c:435
435 /tmp/pear/temp/xdebug/src/lib/var.c: No such file or directory.
(gdb) bt full
#0 fetch_zval_from_symbol_table (value_in=value_in@entry=0x7fffd8394dd0, name=0x55b364fd1310 "returnEarly", name_length=<optimized out>, type=<optimized out>,
ccn=ccn@entry=0x0, ccnl=<optimized out>, cce=0x0) at /tmp/pear/temp/xdebug/src/lib/var.c:435
i = 0
hash_value = 13892113964050252322
opa = <optimized out>
CV = <optimized out>
ht = <optimized out>
element = 0x55b364fd2e60 "returnEarly"
element_length = 11
zpp = <optimized out>
free_duplicated_name = 0
myht = 0x0
orig_value_in = 0x7fffd8394dd0
tmp_retval = {value = {lval = 32, dval = 1.5810100666919889e-322, counted = 0x20, str = 0x20, arr = 0x20, obj = 0x20, res = 0x20, ref = 0x20, ast = 0x20,
zv = 0x20, ptr = 0x20, ce = 0x20, func = 0x20, ww = {w1 = 32, w2 = 0}}, u1 = {type_info = 0, v = {type = 0 '\000', type_flags = 0 '\000', u = {extra = 0}}},
u2 = {next = 0, cache_slot = 0, opline_num = 0, lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, guard = 0, constant_flags = 0, extra = 0}}
#1 0x00007f49d0c321e0 in xdebug_get_php_symbol (retval=0x7fffd8394dd0, name=<optimized out>) at /tmp/pear/temp/xdebug/src/lib/var.c:848
found = <optimized out>
state = <optimized out>
ptr = <optimized out>
ctr = 11
keyword = <optimized out>
keyword_end = <optimized out>
type = <optimized out>
current_classname = 0x0
current_ce = <optimized out>
cc_length = <optimized out>
quotechar = <optimized out>
0000002 0x00007f49d0c4b564 in zval_from_stack_add_frame_variables (opa=0x55b364eed350, symbols=<optimized out>, edata=0x55b36355cb70, frame=0x55b364fd0d70)
at /tmp/pear/temp/xdebug/src/develop/stack.c:432
symbol_name = 0x55b3651bacc0
symbol = {value = {lval = 1, dval = 4.9406564584124654e-324, counted = 0x1, str = 0x1, arr = 0x1, obj = 0x1, res = 0x1, ref = 0x1, ast = 0x1, zv = 0x1,
ptr = 0x1, ce = 0x1, func = 0x1, ww = {w1 = 1, w2 = 0}}, u1 = {type_info = 0, v = {type = 0 '\000', type_flags = 0 '\000', u = {extra = 0}}}, u2 = {
next = 0, cache_slot = 0, opline_num = 0, lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, guard = 0, constant_flags = 0, extra = 0}}
j = 0
variables = {value = {lval = 94228971160752, dval = 4.6555297493493132e-310, counted = 0x55b3645a84b0, str = 0x55b3645a84b0, arr = 0x55b3645a84b0,
obj = 0x55b3645a84b0, res = 0x55b3645a84b0, ref = 0x55b3645a84b0, ast = 0x55b3645a84b0, zv = 0x55b3645a84b0, ptr = 0x55b3645a84b0, ce = 0x55b3645a84b0,
func = 0x55b3645a84b0, ww = {w1 = 1683653808, w2 = 21939}}, u1 = {type_info = 775, v = {type = 7 '\a', type_flags = 3 '\003', u = {extra = 0}}}, u2 = {
next = 0, cache_slot = 0, opline_num = 0, lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, guard = 0, constant_flags = 0, extra = 0}}
0000003 zval_from_stack_add_frame (output=0x7f49d0c6e498 <xdebug_globals+1048>, fse=0x55b3644d7ea0, edata=0x55b36355cb70, add_local_vars=<optimized out>,
params_as_values=<optimized out>) at /tmp/pear/temp/xdebug/src/develop/stack.c:467
frame = <optimized out>
0000004 0x00007f49d0c4b97f in zval_from_stack (output=output@entry=0x7f49d0c6e498 <xdebug_globals+1048>, add_local_vars=add_local_vars@entry=true,
params_as_values=params_as_values@entry=true) at /tmp/pear/temp/xdebug/src/develop/stack.c:495
--Type <RET> for more, q to quit, c to continue without paging--RET
fse = 0x55b3644d7ea0
next_fse = 0x55b3644d7f90
i = 22
0000005 0x00007f49d0c4dc37 in xdebug_develop_throw_exception_hook (exception=exception@entry=0x55b3651c66b0, file=file@entry=0x55b3651c6708, line=line@entry=0x55b3651c6718,
code=code@entry=0x55b3651c66f8, code_str=code_str@entry=0x0, message=message@entry=0x55b3651c66d8) at /tmp/pear/temp/xdebug/src/develop/stack.c:1252
exception_ce = 0x55b363428460
exception_trace = <optimized out>
tmp_str = {l = 89628, a = 90342,
d = 0x55b3651ec560 "\nReflectionException: Method Doctrine\DBAL\Platforms\AbstractPlatform::hasNativeJsonType does not have a prototype in /var/www/html/vendor/friendsofphp/proxy-manager-lts/src/ProxyManager/Generator/Met"...}
z_previous_exception = <optimized out>
z_last_exception_slot = <optimized out>
z_previous_trace = <optimized out>
previous_exception_obj = <optimized out>
dummy = {value = {lval = 140736821022528, dval = 6.953322837213922e-310, counted = 0x7fffd8394f40, str = 0x7fffd8394f40, arr = 0x7fffd8394f40,
obj = 0x7fffd8394f40, res = 0x7fffd8394f40, ref = 0x7fffd8394f40, ast = 0x7fffd8394f40, zv = 0x7fffd8394f40, ptr = 0x7fffd8394f40, ce = 0x7fffd8394f40,
func = 0x7fffd8394f40, ww = {w1 = 3627634496, w2 = 32767}}, u1 = {type_info = 3551661711, v = {type = 143 '\217', type_flags = 14 '\016', u = {
extra = 54194}}}, u2 = {next = 32585, cache_slot = 32585, opline_num = 32585, lineno = 32585, num_args = 32585, fe_pos = 32585, fe_iter_idx = 32585,
guard = 32585, constant_flags = 32585, extra = 32585}}
0000006 0x00007f49d0c26007 in xdebug_throw_exception_hook (exception=0x55b3651c66b0) at /tmp/pear/temp/xdebug/src/base/base.c:1580
code = 0x55b3651c66f8
message = 0x55b3651c66d8
file = 0x55b3651c6708
line = 0x55b3651c6718
exception_ce = <optimized out>
code_str = 0x0
dummy = {value = {lval = 139955012034688, dval = 6.9146963409637559e-310, counted = 0x7f49d0c6e080 <xdebug_globals>, str = 0x7f49d0c6e080 <xdebug_globals>,
arr = 0x7f49d0c6e080 <xdebug_globals>, obj = 0x7f49d0c6e080 <xdebug_globals>, res = 0x7f49d0c6e080 <xdebug_globals>, ref = 0x7f49d0c6e080 <xdebug_globals>,
ast = 0x7f49d0c6e080 <xdebug_globals>, zv = 0x7f49d0c6e080 <xdebug_globals>, ptr = 0x7f49d0c6e080 <xdebug_globals>, ce = 0x7f49d0c6e080 <xdebug_globals>,
func = 0x7f49d0c6e080 <xdebug_globals>, ww = {w1 = 3502694528, w2 = 32585}}, u1 = {type_info = 1436577792, v = {type = 0 '\000', type_flags = 112 'p', u = {
extra = 21920}}}, u2 = {next = 2924062523, cache_slot = 2924062523, opline_num = 2924062523, lineno = 2924062523, num_args = 2924062523,
fe_pos = 2924062523, fe_iter_idx = 2924062523, guard = 2924062523, constant_flags = 2924062523, extra = 2924062523}}
0000007 xdebug_throw_exception_hook (exception=0x55b3651c66b0) at /tmp/pear/temp/xdebug/src/base/base.c:1532
code = <optimized out>
message = <optimized out>
file = <optimized out>
line = <optimized out>
exception_ce = <optimized out>
code_str = 0x0
dummy = <optimized out>
0000008 0x000055b36163e14e in zend_throw_exception_internal ()
No symbol table info available.
0000009 0x000055b36163e25d in ?? ()
No symbol table info available.

Additional info about php and other:
PHP 8.3.2 (cli) (built: Feb 1 2024 02:04:11) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.2, Copyright (c) Zend Technologies
with Zend OPcache v8.3.2, Copyright (c), by Zend Technologies
with Xdebug v3.3.1, Copyright (c) 2002-2023, by Derick Rethans
make[1]: Leaving directory '/var/www/docker-symfony-api/htdocs'
make[1]: Entering directory '/var/www/docker-symfony-api/htdocs'

Symfony

Version 6.4.2
Long-Term Support Yes
End of maintenance 11/2026 (in +1030 days)
End of life 11/2027 (in +1395 days)

Kernel

Type App\Kernel
Environment dev
Debug true
Charset UTF-8
Cache directory ./var/cache/dev (11.7 MiB)
Build directory ./var/cache/dev (11.7 MiB)
Log directory ./var/log (360 KiB)

PHP

Version 8.3.2
Architecture 64 bits
Intl locale en_US_POSIX
Timezone UTC (2024-02-04T15:41:59+00:00)
OPcache true
APCu false
Xdebug true

Thanks in Advance

This seems to be a duplicate of 0002242, which has the better backtrace and information. Please "subscribe" to that issue to get updates.

Temporary solutions:
1)Do not use develop mode, f.e. only xdebug.mode = coverage,debug
2)Set APP_DEBUG=0 inside .env if you are using Symfony

@derick - I can see segmentation fault for all version of xdebug since alpha 3.3.*, latest branch 3.3 https://github.com/xdebug/xdebug/tree/xdebug_3_3 the same issue.

can confirm the same behavior.

Docker image:
Debian 11
PHP 8.0.30
XDebug 3.3.1
Laminas Framework

after rebuild of docker-container i got this SIGSEGV error.
web browser showed ERR_EMPTY_RESPONSE.
container showed output something like:
[mpm_itk:error] child died with signal 11.

xdebug worked, but on some point of framework logic PHPStorm became work unstable and it seems web-request crashed and restarted. the same in loop ~ 3 times (Google Chrome).

i tried to reverse upgrade of extension, which were also updated (redis) - no luck.
ONLY after downgrade xdebug to 3.2.2 - all works fine as before.

today the same situation was repeated for my coalleague, which uses the same docker image on MacOS.

so something went wrong with latest version. downgrade helped in both cases.

Probably that is will not be surprise for anybody but php 8.2 and xdebug 3.3.1 is affected as well :)