Slab corruption detected with debug kernel on RHEL5

Issue

What does the following message mean?

Slab corruption: (Tainted: PF    ) start=f3e9a34c, len=128
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<c04b23ea>](remove_proc_entry+0xbf/0x103)
 [<c04797f2>] check_poison_obj+0x6a/0x179
 [<c0479a6a>] cache_alloc_debugcheck_after+0x25/0x148
 [<c047acb8>] __kmalloc+0xe0/0xeb
 [<f8845d48>] start_this_handle+0x88/0x34d [jbd]
 [<f8845d48>] start_this_handle+0x88/0x34d [jbd]
 [<f8845d48>] start_this_handle+0x88/0x34d [jbd]
 [<c047af20>] kmem_cache_alloc+0xa4/0xaf
 [<f8846085>] journal_start+0x78/0xdb [jbd]
 [<f8846085>] journal_start+0x78/0xdb [jbd]
 [<f88460b9>] journal_start+0xac/0xdb [jbd]
 [<f88813ae>] ext3_dirty_inode+0x24/0x66 [ext3]
 [<c049e8bf>] __mark_inode_dirty+0x27/0x144
 [<c04615dd>] __generic_file_aio_write_nolock+0x38d/0x52a
 [<c04617d6>] generic_file_aio_write+0x5c/0xaf
 [<f887ced1>] ext3_file_write+0x19/0x86 [ext3]
 [<c047e60a>] do_sync_write+0xb6/0xf1
 [<c043777f>] autoremove_wake_function+0x0/0x2d
 [<c047e554>] do_sync_write+0x0/0xf1
 [<c047ee93>] vfs_write+0xa1/0x143
 [<c047f4ca>] sys_write+0x3c/0x63
 [<c0404fc3>] syscall_call+0x7/0xb
 =======================
030: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00
Prev obj: start=f3e9a2c0, len=128
Redzone: 0x170fc2a5/0x170fc2a5.
Last user: [<f8845d48>](start_this_handle+0x88/0x34d [jbd])
000: 20 6f 75 f6 89 0a 00 00 05 00 00 00 64 0b 00 00
010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Next obj: start=f3e9a3d8, len=128
Redzone: 0x170fc2a5/0x170fc2a5.
Last user: [<c05d6b0e>](neigh_resolve_output+0xd7/0x1e5)
000: 00 00 00 00 02 00 00 00 08 00 00 00 0e 00 00 00
010: fe 20 5d c0 00 00 00 01 ed 1e af de ff ff ff ff