PHP: segmentation fault when exiting

[barhom]

When running any PHP script the script finishes successfully however exits with a "Segmentation fault".

Running master from 2020-06-04.
Packages installed:

opkg list-installed | grep php
php7 - 7.4.6-1
php7-cli - 7.4.6-1
php7-mod-filter - 7.4.6-1
php7-mod-json - 7.4.6-1
php7-mod-mbstring - 7.4.6-1
php7-mod-openssl - 7.4.6-1

The php script:

# cat test.php 
<?php
echo "HELLO WORLD\n";

The output:

# php-cli test.php 
HELLO WORLD
Segmentation fault

[barhom]

@mhei do you know what is causing this?

Thanks

[mhei]

Sorry to the long delay. It seems to be a problem with the mbstring extension: when I disable this extension, then the segfault goes away. Will try to dig deeper into this...

[mhei]

I traced it down with gdb to be a problem in oniguruma:

Program received signal SIGSEGV, Segmentation fault.
0xb6e37f70 in i_free_callout_name_entry (key=0x369040, e=0x0, arg=0x37afe0) at oniguruma-6.9.5_rev1/src/regparse.c:1297

I'll create a PR with a fix, see kkos/oniguruma#196.