I have a Supermicro box with dual 3.2GHz Xeon processors, a 250GB disk containing FC5 and 16 x 750GB sata disks on a single Areca controller. Linux vsnap1 2.6.15-1.2054_FC5smp #1 SMP Tue Mar 14 16:05:46 EST 2006 i686 i686 i386 GNU/Linux I occasionally see output like that below on the console. It doesn't seem to affect the running of the machine at all, but it is still rather worrying... Does anybody know what causes it? Jun 26 18:15:04 vsnap1 kernel: BUG: soft lockup detected on CPU#1! Jun 26 18:15:04 vsnap1 kernel: Jun 26 18:15:04 vsnap1 kernel: Pid: 25, comm: kblockd/1 Jun 26 18:15:04 vsnap1 kernel: EIP: 0060:[<f8849887>] CPU: 1 Jun 26 18:15:04 vsnap1 kernel: EIP is at scsi_request_fn+0x2d6/0x30a [scsi_mod] Jun 26 18:15:04 vsnap1 kernel: EFLAGS: 00000246 Not tainted (2.6.15-1.2054_FC5smp #1) Jun 26 18:15:04 vsnap1 kernel: EAX: 00000000 EBX: 00000000 ECX: f60ec250 EDX: 00000001 Jun 26 18:15:04 vsnap1 kernel: ESI: f7e9c400 EDI: f5de4000 EBP: c6a4102c DS: 007b ES: 007b Jun 26 18:15:04 vsnap1 kernel: CR0: 8005003b CR2: ad934000 CR3: 36256220 CR4: 000006f0 Jun 26 18:15:04 vsnap1 kernel: [<c01d062b>] cfq_kick_queue+0x70/0x80 [<c01314b0>] run_workqueue+0x7f/0xba Jun 26 18:15:04 vsnap1 kernel: [<c01d05bb>] cfq_kick_queue+0x0/0x80 [<c0131c9d>] worker_thread+0x0/0x117 Jun 26 18:15:04 vsnap1 kernel: [<c0131d83>] worker_thread+0xe6/0x117 [<c011da13>] default_wake_function+0x0/0xc Jun 26 18:15:04 vsnap1 kernel: [<c01345b1>] kthread+0x9d/0xc9 [<c0134514>] kthread+0x0/0xc9 Jun 26 18:16:58 vsnap1 kernel: [<c0102005>] kernel_thread_helper+0x5/0xb <3>BUG: soft lockup detected on CPU#1! Jun 26 18:16:58 vsnap1 kernel: Jun 26 18:16:58 vsnap1 kernel: Pid: 25, comm: kblockd/1 Jun 26 18:16:58 vsnap1 kernel: EIP: 0060:[<f8849887>] CPU: 1 Jun 26 18:16:58 vsnap1 kernel: EIP is at scsi_request_fn+0x2d6/0x30a [scsi_mod] Jun 26 18:16:58 vsnap1 kernel: EFLAGS: 00000246 Not tainted (2.6.15-1.2054_FC5smp #1) Jun 26 18:16:58 vsnap1 kernel: EAX: 00000000 EBX: 00000000 ECX: f60ec250 EDX: 00000001 Jun 26 18:16:58 vsnap1 kernel: ESI: f7e9c400 EDI: f5de4000 EBP: c6a4102c DS: 007b ES: 007b Jun 26 18:16:58 vsnap1 kernel: CR0: 8005003b CR2: ad934000 CR3: 37d5f500 CR4: 000006f0 Jun 26 18:16:58 vsnap1 kernel: [<c01d062b>] cfq_kick_queue+0x70/0x80 Jun 26 18:16:58 vsnap1 kernel: [<c01314b0>] run_workqueue+0x7f/0xba [<c01d05bb>] cfq_kick_queue+0x0/0x80 Jun 26 18:16:58 vsnap1 kernel: [<c0131c9d>] worker_thread+0x0/0x117 [<c0131d83>] worker_thread+0xe6/0x117 Jun 26 18:16:58 vsnap1 kernel: [<c011da13>] default_wake_function+0x0/0xc [<c01345b1>] kthread+0x9d/0xc9 Jun 26 18:16:58 vsnap1 kernel: [<c0134514>] kthread+0x0/0xc9 [<c0102005>] kernel_thread_helper+0x5/0xb
