Hi guys,

with the kernel rh7-3.10.0-327.36.1.vz7.18.7 we're seeing the
following WARNING while running LTP test suite:

[11796.576981] WARNING: at mm/slub.c:1252
slab_pre_alloc_hook.isra.42.part.43+0x15/0x17()

[11796.591008] Call Trace:
[11796.592065]  [<ffffffff8164c468>] dump_stack+0x19/0x1b
[11796.593076]  [<ffffffff8107b850>] warn_slowpath_common+0x70/0xb0
[11796.594228]  [<ffffffff8107b99a>] warn_slowpath_null+0x1a/0x20
[11796.595442]  [<ffffffff81649469>]
slab_pre_alloc_hook.isra.42.part.43+0x15/0x17
[11796.596686]  [<ffffffff811d8b68>] kmem_cache_alloc_trace+0x58/0x230
[11796.597965]  [<ffffffff813126ee>] ? kmapset_new+0x1e/0x50
[11796.599224]  [<ffffffff813126ee>] kmapset_new+0x1e/0x50
[11796.600433]  [<ffffffff8127c7ba>] __sysfs_add_one+0x4a/0xb0
[11796.601431]  [<ffffffff8127c83b>] sysfs_add_one+0x1b/0xd0
[11796.602451]  [<ffffffff8127baa7>] sysfs_add_file_mode+0xb7/0x100
[11796.603449]  [<ffffffff8127bb1a>] sysfs_create_file+0x2a/0x30
[11796.604461]  [<ffffffff812fe12c>] kobject_add_internal+0x16c/0x2f0
[11796.605503]  [<ffffffff812fe5b5>] kobject_add+0x75/0xd0
[11796.606627]  [<ffffffff811d8d17>] ? kmem_cache_alloc_trace+0x207/0x230
[11796.607655]  [<ffffffffa0563091>] __link_block_group+0xe1/0x120 [btrfs]
[11796.608634]  [<ffffffffa05661a0>] btrfs_make_block_group+0x150/0x270 [btrfs]
[11796.609701]  [<ffffffffa059fd5f>] __btrfs_alloc_chunk+0x67f/0x8a0 [btrfs]
[11796.610756]  [<ffffffffa05a2eb4>] btrfs_alloc_chunk+0x34/0x40 [btrfs]
[11796.611800]  [<ffffffffa055d62f>] do_chunk_alloc+0x23f/0x410 [btrfs]
[11796.612954]  [<ffffffffa055e61a>]
btrfs_check_data_free_space+0xea/0x280 [btrfs]
[11796.614008]  [<ffffffffa05898a1>] __btrfs_buffered_write+0x151/0x5c0 [btrfs]
[11796.615153]  [<ffffffffa058d056>] btrfs_file_aio_write+0x246/0x560 [btrfs]
[11796.616141]  [<ffffffff811eae92>] ? __mem_cgroup_commit_charge+0x152/0x350
[11796.617220]  [<ffffffff811faff0>] do_sync_write+0x90/0xe0
[11796.618253]  [<ffffffff811fb81d>] vfs_write+0xbd/0x1e0
[11796.619224]  [<ffffffff811fc2bf>] SyS_write+0x7f/0xe0
[11796.620185]  [<ffffffff8165ccc9>] system_call_fastpath+0x16/0x1b
[11796.621145] ---[ end trace 1437311f89b9e3c6 ]---

Thanks!
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