slab: remove /proc/slab_allocators
It turned out that DEBUG_SLAB_LEAK is still broken even after recent recue efforts that when there is a large number of objects like kmemleak_object which is normal on a debug kernel, # grep kmemleak /proc/slabinfo kmemleak_object 2243606 3436210 ... reading /proc/slab_allocators could easily loop forever while processing the kmemleak_object cache and any additional freeing or allocating objects will trigger a reprocessing. To make a situation worse, soft-lockups could easily happen in this sitatuion which will call printk() to allocate more kmemleak objects to guarantee an infinite loop. Also, since it seems no one had noticed when it was totally broken more than 2-year ago - see the commit fcf88917 ("slab: fix a crash by reading /proc/slab_allocators"), probably nobody cares about it anymore due to the decline of the SLAB. Just remove it entirely. Suggested-by:Vlastimil Babka <vbabka@suse.cz> Suggested-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Qian Cai <cai@lca.pw> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
parent
01be377c
Please register or sign in to comment