Messages in this thread | | | From | Cong Wang <> | Date | Thu, 27 Apr 2017 13:31:10 -0700 | Subject | Re: Boot regression caused by kauditd |
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On Wed, Apr 26, 2017 at 2:20 PM, Paul Moore <paul@paul-moore.com> wrote: > Thanks for the report, this is the only one like it that I've seen. > I'm looking at the code in Linus' tree and I'm not seeing anything > obvious ... looking at the trace above it appears that the problem is > when get_net() goes to bump the refcount and the passed net pointer is > NULL; unless I'm missing something, the only way this would happen in > kauditd_thread() is if the auditd_conn.pid value is non-zero but the > auditd_conn.net pointer is NULL. > > That shouldn't happen. >
Looking at the code that reads/writes the global auditd_conn, I don't see how it even works with RCU+spinlock, RCU plays with pointers and you have to make a copy as its name implies. But it looks like you simply use RCU+spinlock as a traditional rwlock, it doesn't work.
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