What is a soft lockup?

[Mike]

Hey Zac,

maybe this helps you out:
http://www.gossamer-threads.com/lists/linux/kernel/655450

Mike

Zac Tolley schreef:
> I'm running a fc5 box, with a bunch of disks and opennms, which puts a 
> high workload on the disks. Not running raid.
>
> In /var/logl/messages i get and error like this repeatedl. The box is 
> a dual xeon and it seems like each cpu in turn shows this error.
>
> what does it mean?
>
>
>
> Jul  2 04:00:21 opennms kernel: BUG: soft lockup detected on CPU#2!
> Jul  2 04:00:21 opennms kernel: CPU 2:
> Jul  2 04:00:21 opennms kernel: Modules linked in: loop ipv6 ppdev 
> autofs4 hidp rfcomm l2cap bluetooth sunrpc ip_conntrack_netbios_ns 
> ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp iptable_filter 
> ip_tables x_tables video button battery ac lp parport_pc parport 
> floppy nvram uhci_hcd ehci_hcd e1000 tg3 hw_random e752x_edac edac_mc 
> dm_snapshot dm_zero dm_mirror dm_mod ext3 jbd cciss mptspi mptscsih 
> sd_mod scsi_mod mptbase
> Jul  2 04:00:21 opennms kernel: Pid: 27, comm: kblockd/2 Not tainted 
> 2.6.15-1.2054_FC5 #1
> Jul  2 04:00:21 opennms kernel: RIP: 0010:[<ffffffff8033b86a>] 
> <ffffffff8033b86a>{_spin_unlock_irqrestore+11}
> Jul  2 04:00:21 opennms kernel: RSP: 0018:ffff81015b435e08  EFLAGS: 
> 00000247
> Jul  2 04:00:21 opennms kernel: RAX: 0000000000000002 RBX: 
> 0000000000000247 RCX: ffff81015a4d2850
> Jul  2 04:00:21 opennms kernel: RDX: 0000000000000002 RSI: 
> 0000000000000247 RDI: ffff81015a40b3d8
> Jul  2 04:00:21 opennms kernel: RBP: ffff81015a4d2938 R08: 
> ffff81015a4d28a0 R09: ffff81015a4d2800
> Jul  2 04:00:21 opennms kernel: R10: 00000000dffe0000 R11: 
> ffff81015a40b000 R12: ffff81015b4118c0
> Jul  2 04:00:21 opennms kernel: R13: 0000000000000247 R14: 
> ffff81015b028ce8 R15: ffffffff801fd5c7
> Jul  2 04:00:21 opennms kernel: FS:  0000000000000000(0000) 
> GS:ffff81015bf256c0(0000) knlGS:0000000000000000
> Jul  2 04:00:21 opennms kernel: CS:  0010 DS: 0018 ES: 0018 CR0: 
> 000000008005003b
> Jul  2 04:00:21 opennms kernel: CR2: 00002b78d369f000 CR3: 
> 0000000000101000 CR4: 00000000000006e0
> Jul  2 04:00:21 opennms kernel:
> Jul  2 04:00:21 opennms kernel: Call Trace: 
> <ffffffff801425e1>{run_workqueue+159} <ffffffff80142c7a>{worker_thread+0}
> Jul  2 04:00:21 opennms kernel:        
> <ffffffff80145ca3>{keventd_create_kthread+0} 
> <ffffffff80142d83>{worker_thread+265}
> Jul  2 04:00:21 opennms kernel:        
> <ffffffff8012959c>{__wake_up_common+62} 
> <ffffffff8012ad74>{default_wake_function+0}
> Jul  2 04:00:21 opennms kernel:        
> <ffffffff80145ca3>{keventd_create_kthread+0} 
> <ffffffff80145fb6>{kthread+254}
> Jul  2 04:00:21 opennms kernel:        <ffffffff8010b8e6>{child_rip+8} 
> <ffffffff80145ca3>{keventd_create_kthread+0}
> Jul  2 04:00:21 opennms kernel:        
> <ffffffff80339fce>{thread_return+0} <ffffffff80145eb8>{kthread+0}
> Jul  2 04:00:21 opennms kernel:        <ffffffff8010b8de>{child_rip+0}
>
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