>From the log, there is a bug surely: allock(GFP_KERNEL) is called with
>spinlock holding, so
the warning is triggered:
struct cred *prepare_creds(void)
{
......
new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
......
}
and prepare_creds is called in this path with spin_lock holding:
do_prlimit
->task_lock(tsk->group_leader);
->spin_lock(&p->alloc_lock);
...
->apparmor_task_setrlimit
->aa_current_profile
->aa_replace_current_profile
->prepare_creds
->task_unlock(tsk->group_leader);
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https://bugs.launchpad.net/bugs/791022
Title:
cupsd lockdep warning
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