Failed to read "/sys/bus/pci/devices/0000:05:00.0/vpd": open /sys/bus/pci/devices/0000:05:00.0/vpd: permission denied

[Björn Tillenius]

This is using 3.2.0~beta4-11929-g.17a5a5fa7 as a snap.

The controller can not refresh its networking/hardware configuration:

2022-05-13 10:21:54 twisted.internet.defer: [critical] Unhandled error in Deferred:
2022-05-13 10:21:54 twisted.internet.defer: [critical]
        Traceback (most recent call last):
          File "/usr/lib/python3.8/threading.py", line 870, in run
            self._target(*self._args, **self._kwargs)
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/twisted.py", line 821, in worker
            return target()
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in work
            task()
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/_threads/_team.py", line 190, in doWork
            task()
        --- <exception caught here> ---
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/python/threadpool.py", line 250, in inContext
            result = inContext.theWork()
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/python/threadpool.py", line 266, in <lambda>
            inContext.theWork = lambda: context.call(ctx, func, *args, **kw)
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/python/context.py", line 122, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/snap/maas/20983/usr/lib/python3/dist-packages/twisted/python/context.py", line 85, in callWithContext
            return func(*args,**kw)
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/twisted.py", line 856, in callInContext
            return func(*args, **kwargs)
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/twisted.py", line 202, in wrapper
            result = func(*args, **kwargs)
          File "/snap/maas/20983/lib/python3.8/site-packages/maasserver/utils/orm.py", line 756, in call_within_transaction
            return func_outside_txn(*args, **kwargs)
          File "/snap/maas/20983/lib/python3.8/site-packages/maasserver/utils/orm.py", line 559, in retrier
            return func(*args, **kwargs)
          File "/usr/lib/python3.8/contextlib.py", line 75, in inner
            return func(*args, **kwds)
          File "/snap/maas/20983/lib/python3.8/site-packages/maasserver/ipc.py", line 361, in create_endpoints
            self._updateEndpoints(process, self._getListenAddresses(port))
          File "/snap/maas/20983/lib/python3.8/site-packages/maasserver/ipc.py", line 303, in _getListenAddresses
            addresses = get_all_interface_source_addresses()
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/network.py", line 1207, in get_all_interface_source_addresses
            for network in get_all_interface_subnets():
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/network.py", line 1192, in get_all_interface_subnets
            for interface in get_all_interfaces_definition().values()
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/network.py", line 1139, in get_all_interfaces_definition
            for name, ipaddr in get_ip_addr().items()
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/ipaddr.py", line 28, in get_ip_addr
            output = call_and_check(command)
          File "/snap/maas/20983/lib/python3.8/site-packages/provisioningserver/utils/shell.py", line 106, in call_and_check
            raise ExternalProcessError(process.returncode, command, output=stderr)
        provisioningserver.utils.shell.ExternalProcessError: Command `/snap/maas/20983/usr/share/maas/machine-resources/amd64` returned non-zero exit status 1:
        ERROR: Failed to retrieve PCI information: Failed to read "/sys/bus/pci/devices/0000:05:00.0/vpd": open /sys/bus/pci/devices/0000:05:00.0/vpd: permission denied

[Björn Tillenius (bjornt)]

It seems like the vpd file can't be read from within a container. This is the file on the container:

maas-dev:~> sudo find /sys -name vpd
-rw------- 1 nobody nogroup 0 May 13 10:17 /sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:02.0/0000:05:00.0/vpd
-rw------- 1 nobody nogroup 0 May 16 08:01 /sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:04.0/0000:06:00.0/vpd

maas-dev:~> sudo less /sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:02.0/0000:05:00.0/vpd
/sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:02.0/0000:05:00.0/vpd: Permission denied

From the host, the file looks like this (and can be read):

salvia:~> sudo sudo find /sys -name vpd | xargs ls -l
-rw------- 1 root root 0 maj 12 09:00 /sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:02.0/0000:05:00.0/vpd
-rw------- 1 root root 0 maj 12 09:00 /sys/devices/pci0000:00/0000:00:01.2/0000:02:00.0/0000:03:04.0/0000:06:00.0/vpd