[libvirt-php] libvirt_domain_interface_addresses causing segfault

Fernando Casas Schössow casasfernando at outlook.com
Wed Apr 15 21:41:06 UTC 2020


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.


$netdetails = libvirt_domain_interface_addresses($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:

GNU gdb (Debian 9.1-2) 9.1
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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 
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 
#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.


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