Posix ACL object is leaked in setattr and fsetxattr syscalls

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Issue

Slab usage grows and is never reclaimed, even when the underlying program that prompted the allocation exits.

Environment

Red Hat Enterprise Linux 7
EXT4 filesystem
kernel-3.10.0-1127.el7
kernel-3.10.0-1062.el7
kernel-3.10.0-957.el7
kernel-3.10.0-862.el7

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