slab error in verify_redzone_free(): cache `size-2048': double free detected

Issue

• A slab error occurred on a cluster node with GFS2 filesystems mounted running the kernel-debug version of kernel:

Aug  3 11:22:28 node42 kernel: slab error in verify_redzone_free(): cache `size-2048': double free detected
Aug  3 11:22:28 node42 kernel: Pid: 436, comm: kswapd0 Not tainted 2.6.32-573.1.1.el6.x86_64.debug #1
Aug  3 11:22:28 node42 kernel: Call Trace:
Aug  3 11:22:28 node42 kernel: [<ffffffff8118f999>] ? __slab_error+0x29/0x30
Aug  3 11:22:28 node42 kernel: [<ffffffff81190c29>] ? cache_free_debugcheck+0x249/0x270
Aug  3 11:22:28 node42 kernel: [<ffffffff8119407b>] ? kfree+0xeb/0x310
Aug  3 11:22:28 node42 kernel: [<ffffffff811cd98e>] ? clear_inode+0x3e/0x160
Aug  3 11:22:28 node42 kernel: [<ffffffffa03ae4c0>] ? gfs2_dir_hash_inval+0x40/0x60 [gfs2]
Aug  3 11:22:28 node42 kernel: [<ffffffffa03d4eed>] ? gfs2_clear_inode+0x2d/0xc0 [gfs2]
Aug  3 11:22:28 node42 kernel: [<ffffffff811cda1a>] ? clear_inode+0xca/0x160
Aug  3 11:22:28 node42 kernel: [<ffffffff811cdae8>] ? dispose_list+0x38/0x120
Aug  3 11:22:28 node42 kernel: [<ffffffff811cde3e>] ? shrink_icache_memory+0x26e/0x2e0
Aug  3 11:22:28 node42 kernel: [<ffffffff8115751d>] ? shrink_slab+0x13d/0x1c0
Aug  3 11:22:28 node42 kernel: [<ffffffff8115b5fa>] ? balance_pgdat+0x5aa/0x830
Aug  3 11:22:28 node42 kernel: [<ffffffff81065b68>] ? finish_task_switch+0x48/0x110
Aug  3 11:22:28 node42 kernel: [<ffffffff8115b9c4>] ? kswapd+0x144/0x3c0
Aug  3 11:22:28 node42 kernel: [<ffffffff810a7750>] ? autoremove_wake_function+0x0/0x40
Aug  3 11:22:28 node42 kernel: [<ffffffff8115b880>] ? kswapd+0x0/0x3c0
Aug  3 11:22:28 node42 kernel: [<ffffffff810a72ce>] ? kthread+0x9e/0xc0
Aug  3 11:22:28 node42 kernel: [<ffffffff8100c38a>] ? child_rip+0xa/0x20
Aug  3 11:22:28 node42 kernel: [<ffffffff8100bb90>] ? restore_args+0x0/0x30
Aug  3 11:22:28 node42 kernel: [<ffffffff810a7230>] ? kthread+0x0/0xc0
Aug  3 11:22:28 node42 kernel: [<ffffffff8100c380>] ? child_rip+0x0/0x20
Aug  3 11:22:28 node42 kernel: ffff880400eba898: redzone 1:0x9f911029d74e35b, redzone 2:0x9f911029d74e35b.