Here is the detailed explanation of the issue:
qemu-bridge-helper is dynamically linked to libnuma, and libnuma defines
numa_init() as an _init function (-Wl,-init=numa_init) that is called by
the dynamic loader (ld) each time libnuma is loaded.
When we run qemu-bridge-helper, the dynamic loader loads libnuma and
calls numa_init(), numa_init() tries to open /sys/devices/system/node/
folder and this access is denied by apparmor since this permission is
not specified in the libvirtd profile (usr.sbin.libvirtd).
Here is the call trace:
#0 0x00007fa635bd0cd5 in ?? () from /lib/x86_64-linux-gnu/libnuma.so.1
#1 0x00007fa635bf27ef in call_init (l=<optimized out>, argc=argc@entry=1,
argv=argv@entry=0x7fff2a421158,
env=env@entry=0x7fff2a421168) at ./elf/dl-init.c:74
#2 0x00007fa635bf2904 in call_init (l=<optimized out>, argc=<optimized out>,
argv=<optimized out>, env=<optimized out>)
at ./elf/dl-init.c:120
#3 _dl_init (main_map=0x7fa635c292e0, argc=1, argv=0x7fff2a421158,
env=0x7fff2a421168) at ./elf/dl-init.c:121
#4 0x00007fa635c0eee0 in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
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https://bugs.launchpad.net/bugs/2079869
Title:
qemu-bridge-helper needs apparmor to allow access to
/sys/devices/system/node/
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