I experience this every ~5th shutdown, however the stack trace I see is:
rpcb_getport_async
rpc_malloc
call_bind
call_reserve
__rpc_execute
...
which corresponds to rpcb_clnt.c:322:
BUG_ON(clnt->cl_parent != clnt);
This is called from a kernel thread context and I only see the bug_on
trigger when shutting down, where NetworkManager cutts the ethernet
connection before NFS is unmounted (yikes).
--
kernel bug rpc nfs client
https://bugs.launchpad.net/bugs/212485
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