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SL6.1で2.6.32-220.2.1 にあげたらkernelがwarningのtrace吐いてた

RHEL6 互換のOSで起きている現象?

# cat /etc/redhat-release 
Scientific Linux release 6.1 (Carbon)
# uname -a
Linux hoge 2.6.32-220.2.1.el6.x86_64 #1 SMP Thu Dec 22 11:15:52 CST 2011 x86_64 x86_64 x86_64 GNU/Linux
# cat messages 
(抜粋) 
kernel: ------------[ cut here ]------------
kernel: WARNING: at kernel/sched.c:5914 thread_return+0x232/0x79d() (Not tainted)
kernel: Hardware name: ***************
kernel: Modules linked in: bluetooth rfkill tcp_diag inet_diag ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables autofs4 nfs lockd fscache nfs_acl auth_rpcgss sunrpc bridge stp llc bonding ipv6 dm_mirror dm_region_hash dm_log vhost_net macvtap macvlan tun kvm_intel kvm power_meter microcode i2c_i801 i2c_core sg iTCO_wdt iTCO_vendor_support e1000e ioatdma dca i7core_edac edac_core shpchp ext4 mbcache jbd2 raid1 sd_mod crc_t10dif pata_acpi ata_generic ata_piix dm_mod [last unloaded: scsi_wait_scan]
kernel: Pid: 15818, comm: nc Not tainted 2.6.32-220.2.1.el6.x86_64 #1
kernel: Call Trace:
kernel: [<ffffffff81069997>] ? warn_slowpath_common+0x87/0xc0
kernel: [<ffffffff810699ea>] ? warn_slowpath_null+0x1a/0x20
kernel: [<ffffffff814eccc5>] ? thread_return+0x232/0x79d
kernel: [<ffffffff814ee50d>] ? schedule_hrtimeout_range+0x13d/0x160
kernel: [<ffffffff81090d76>] ? add_wait_queue+0x46/0x60
kernel: [<ffffffff8118b895>] ? __pollwait+0x75/0xf0
kernel: [<ffffffff8118b079>] ? poll_schedule_timeout+0x39/0x60
kernel: [<ffffffff8118bdcb>] ? do_sys_poll+0x45b/0x520
kernel: [<ffffffff8105e782>] ? default_wake_function+0x12/0x20
kernel: [<ffffffff8118b820>] ? __pollwait+0x0/0xf0
kernel: [<ffffffff8118b910>] ? pollwake+0x0/0x60
kernel: [<ffffffff8118b910>] ? pollwake+0x0/0x60
kernel: [<ffffffff8141be4e>] ? sock_aio_write+0x15e/0x170
kernel: [<ffffffff811760fa>] ? do_sync_write+0xfa/0x140
kernel: [<ffffffff81090a10>] ? autoremove_wake_function+0x0/0x40
kernel: [<ffffffff8100bc0e>] ? apic_timer_interrupt+0xe/0x20
kernel: [<ffffffff8100bc0e>] ? apic_timer_interrupt+0xe/0x20
kernel: [<ffffffff81176472>] ? vfs_write+0x132/0x1a0
kernel: [<ffffffff8118c08c>] ? sys_poll+0x7c/0x110
kernel: [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b
kernel: ---[ end trace c3513899017a0755 ]---


1つ目のURLのredhatのKnowledgebase見てる限りは実害があるわけじゃなさそうだし、

There are no adverse effects on a system that encounters this warning.

2.6.32-220.4.1 で治ってるらしいので適当なタイミングでkernel上げる。