Всем привет! С чем может быть связана следующая ошибка?

nginx version: nginx/1.1.11

sendfiles on;
Задан worker_cpu_affinity

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WARNING: at kernel/sched.c:5914 thread_return+0x232/0x79d() (Not tainted)
Hardware name: S5520UR
Modules linked in: nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipv6 iptable_filter ip_tables i2c_i801 i2c_core sg iTCO_wdt iTCO_vendor_support ioatdma i7core_edac edac_core igb dca ext4 mbcache jbd2 sd_mod crc_t10dif pata_acpi ata_generic ata_piix aacraid dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
Pid: 22153, comm: nginx Not tainted 2.6.32-220.2.1.el6.x86_64 #1
Call Trace:
[<ffffffff81069997>] ? warn_slowpath_common+0x87/0xc0
[<ffffffff810699ea>] ? warn_slowpath_null+0x1a/0x20
[<ffffffff814eccc5>] ? thread_return+0x232/0x79d
[<ffffffff8146808c>] ? ip_finish_output+0x13c/0x310
[<ffffffffa007409d>] ? do_get_write_access+0x29d/0x520 [jbd2]
[<ffffffff81090a50>] ? wake_bit_function+0x0/0x50
[<ffffffffa0074471>] ? jbd2_journal_get_write_access+0x31/0x50 [jbd2]
[<ffffffffa00c8b78>] ? __ext4_journal_get_write_access+0x38/0x80 [ext4]
[<ffffffffa00a4253>] ? ext4_reserve_inode_write+0x73/0xa0 [ext4]
[<ffffffff8141cdde>] ? release_sock+0xce/0xe0
[<ffffffffa00a42cc>] ? ext4_mark_inode_dirty+0x4c/0x1d0 [ext4]
[<ffffffffa00a45c0>] ? ext4_dirty_inode+0x40/0x60 [ext4]
[<ffffffff8119fc6b>] ? __mark_inode_dirty+0x3b/0x160
[<ffffffff811901e2>] ? file_update_time+0xf2/0x170
[<ffffffff81112b50>] ? __generic_file_aio_write+0x220/0x480
[<ffffffff810097cc>] ? __switch_to+0x1ac/0x320
[<ffffffff81112e1f>] ? generic_file_aio_write+0x6f/0xe0
[<ffffffffa009dde1>] ? ext4_file_write+0x61/0x1e0 [ext4]
[<ffffffff811760fa>] ? do_sync_write+0xfa/0x140
[<ffffffff81090a10>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8120c1d6>] ? security_file_permission+0x16/0x20
[<ffffffff811763f8>] ? vfs_write+0xb8/0x1a0
[<ffffffff810d4502>] ? audit_syscall_entry+0x272/0x2a0
[<ffffffff81176e01>] ? sys_write+0x51/0x90
[<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b
---[ end trace 3ce74bcb89ca0e11 ]---