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Andrea Arcangeli authored
If getdents64 is killed or hits on segfault, it'll leave cgroups directories in sysfs pinned leaking memory because the kernfs node won't be freed on rmdir and the parent neither. Repro: # for i in `seq 1000`; do mkdir $i; done # rmdir * # for i in `seq 1000`; do mkdir $i; done # rmdir * # for i in `seq 1000`; do while :; do ls $i/ >/dev/null; done & done # while :; do killall ls; done kernfs_node_cache in /proc/slabinfo keeps going up as expected. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org # goes way back to original sysfs days Link: https://lore.kernel.org/r/20190805173404.GF136335@devbig004.ftw2.facebook.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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