Hi,

While executing libvirt_domain_interface_addresses() with the qemu-agent running in the guest as the source, the function causes PHP to segfault. If I change the source to either dhcp or arp, the function executes correctly.

Example:

$netdetails = libvirt_domain_interface_addresses($vmres, 0); <-- executes correctly (dhcp source)

$netdetails = libvirt_domain_interface_addresses($vmres, 1); <-- segfault (qemu agent source)

$netdetails = libvirt_domain_interface_addresses($vmres, 2); <-- executes correctly (arp source)

I tested the equivalent function using virsh against the same host and it executes correctly with any source.

I have a php-cgi core file that I can share if that may help on finding the problem.

gdb output:

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Reading symbols from /usr/bin/php-cgi...

(No debugging symbols found in /usr/bin/php-cgi)

[New LWP 2594]

[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-cgi index.php'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:85

85 ../sysdeps/x86_64/multiarch/../strlen.S: No such file or directory.

(gdb) bt

#0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:85

#1 0x000055c6a4ceacd2 in add_assoc_string_ex ()

#2 0x00007f4d36175253 in ?? () from /usr/lib/php/20180731/libvirt-php.so

#3 0x000055c6a4d6b477 in execute_ex ()

#4 0x000055c6a4d705c7 in zend_execute ()

#5 0x000055c6a4ce8ed4 in zend_execute_scripts ()

#6 0x000055c6a4c8be38 in php_execute_script ()

#7 0x000055c6a4b53da8 in ?? ()

#8 0x00007f4d39efce0b in __libc_start_main (main=0x55c6a4b51cf0, argc=2, argv=0x7fff35718588, init=<optimized out>, fini=<optimized out>,

rtld_fini=<optimized out>, stack_end=0x7fff35718578) at ../csu/libc-start.c:308

#9 0x000055c6a4b544ca in _start ()

System information:

OS: Debian Bullseye

PHP version (fast cgi): 7.3.15

Libvirt PHP version: 0.5.5

Libvirt version: 6.0.0

KVM host libvirt version: 5.9.0

If you need any other information please let me know.

Thanks.

Fernando