It seems reproductible, on dual Opteron (x86_64), NUMA enabled.
When issuing :
opcontrol --deinit
slab error in kmem_cache_destroy(): cache `dcookie_cache': Can't free all
objects
Call Trace: <ffffffff802715ef>{kmem_cache_destroy+175}
<ffffffff802b4c48>{dcookie_unregister+280}
<ffffffff803a4ff7>{event_buffer_release+23}
<ffffffff802767a8>{__fput+88} <ffffffff8027382d>{filp_close+93}
<ffffffff8022ee2e>{put_files_struct+110}
<ffffffff8023025a>{do_exit+650}
<ffffffff802ec581>{__up_write+33} <ffffffff80230998>{do_group_exit+200}
<ffffffff80209cbe>{system_call+126}
# grep dcookie_cache /proc/slabinfo
dcookie_cache 0 0 32 112 1 : tunables 120 60 8 :
slabdata 0 0 0
After that, oprofile cannot work anymore, since the dcookie_cache cannot be
re-created...
kmem_cache_create: duplicate cache dcookie_cache
Call Trace: <ffffffff802726ff>{kmem_cache_create+1455}
<ffffffff80285f55>{do_path_lookup+629}
<ffffffff803a4e20>{event_buffer_open+0}
<ffffffff802b4dc0>{dcookie_register+96}
<ffffffff803a4e5a>{event_buffer_open+58}
<ffffffff80273aad>{__dentry_open+237}
<ffffffff80273cca>{do_filp_open+42}
<ffffffff80273935>{get_unused_fd+101}
<ffffffff80273d36>{do_sys_open+86}
<ffffffff80209cbe>{system_call+126}
Eric Dumazet
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