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    SubjectRe: [origin tree boot crash] Revert "selinux: clean up avc node cache when disabling selinux"
    From
    On Sat, Sep 12, 2009 at 10:28 PM, Eric Paris <eparis@redhat.com> wrote:
    > On Sat, 2009-09-12 at 09:24 +0200, Ingo Molnar wrote:

    > Something a lot worse than SELinux here.  I added this exact code and
    > got this warning.  Something is wrong in the world of
    > kmem_cache_destroy.....
    >
    > static struct kmem_cache *tmp_cachep;
    > tmp_cachep = kmem_cache_create("tmp_cache", sizeof(struct avc_node), 0, SLAB_PANIC, NULL);
    >        if (tmp_cachep)
    >                kmem_cache_destroy(tmp_cachep);
    >
    > [    0.006076] ------------[ cut here ]------------
    > [    0.007019] WARNING: at lib/kobject.c:595 kobject_put+0x6e/0x80()
    > [    0.008011] Hardware name:
    > [    0.009006] kobject: '<NULL>' (ffff88001f8da128): is not initialized, yet kobject_put() is being called.
    > [    0.010005] Modules linked in:
    > [    0.011284] Pid: 0, comm: swapper Not tainted 2.6.31-next-20090911 #17
    > [    0.012011] Call Trace:

    Just for those playing along at home, I sent a series of 3 patches to
    fix the invalid creds test and to clear the avc_node_cachep before
    freeing it.
    http://marc.info/?l=linux-kernel&m=125281056403544&w=2
    http://marc.info/?l=linux-kernel&m=125281056403547&w=2
    http://marc.info/?l=linux-kernel&m=125281056403550&w=2

    I also bisected at least one problem with kmem_cache_destroy which I
    posted the bisect results here
    http://marc.info/?l=linux-mm&m=125286686917465&w=2
    2a38a002fbee06556489091c30b04746222167e4
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