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Subject[regression] 2.6.37-rc5: scsi_eh_11 CPU loop
Date
Hi!

top - 10:49:07 up 3 days, 14:24, 8 users, load average: 2.31, 2.62, 2.28
Tasks: 198 total, 2 running, 194 sleeping, 0 stopped, 2 zombie
Cpu(s): 6.8%us, 93.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 2073660k total, 1941152k used, 132508k free, 153876k buffers
Swap: 4000180k total, 243452k used, 3756728k free, 676612k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
735 root 20 0 0 0 0 R 85.2 0.0 137:28.94 scsi_eh_11

I don't see anything in dmesg. Everything appears to work as normal,
except for the slowness. Which got a bit better upon renicing scsi_eh_11
to 19 (not knowing whether its really safe, but it works for now).

Interrupts appear to be within usual range as well:

martin@shambhala:~> vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----
cpu----
r b swpd free buff cache si so bi bo in cs us sy id
wa
2 0 243052 88528 154520 677228 10 28 171 374 416 195 36 20 38
6
3 0 243052 88512 154520 677228 0 0 0 0 1471 992 45 55 0
0
2 0 243052 88324 154520 677228 0 0 0 0 1181 985 49 51 0
0
3 0 243052 88932 154520 677228 0 0 0 0 1339 1672 46 54 0
0
2 0 243052 88900 154520 677228 0 0 0 44 1222 1327 50 50 0
0
3 0 243052 88900 154520 677228 0 0 0 0 1216 1409 48 52 0
0
Kernel in use:

martin@shambhala:~> cat /proc/version
Linux version 2.6.37-rc6-tp42-00009-gb3444d1 (martin@shambhala) (gcc
version 4.4.5 (Debian 4.4.5-8) ) #6 PREEMPT Thu Dec 16 19:25:32 CET 2010
I never saw this with 2.6.36 or 2.7.37-rc3.

I am using a Delock PCMCIA eSATA adapter with Silicon Image controller
from time to time. Yesterday evening for example. Maybe it has to do with
removing it again. Well it got scsi11 for one of its port:

Dec 19 21:56:24 shambhala kernel: pcmcia_socket pcmcia_socket0: pccard:
CardBus card inserted into slot 0
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: [1095:3512] type 0
class 0x000180
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 10: [io
0x0000-0x0007]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 14: [io
0x0000-0x0003]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 18: [io
0x0000-0x0007]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 1c: [io
0x0000-0x0003]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 20: [io
0x0000-0x000f]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 24: [mem
0x00000000-0x000001ff]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: reg 30: [mem
0x00000000-0x0007ffff pref]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: supports D1 D2
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 6: assigned [mem
0xeff80000-0xefffffff pref]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 5: assigned [mem
0xcffffe00-0xcfffffff]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 5: set to [mem
0xcffffe00-0xcfffffff] (PCI address [0xcffffe00-0xcfffffff])
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 4: assigned [io
0x8cf0-0x8cff]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 4: set to [io
0x8cf0-0x8cff] (PCI address [0x8cf0-0x8cff])
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 0: assigned [io
0x8ce8-0x8cef]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 0: set to [io
0x8ce8-0x8cef] (PCI address [0x8ce8-0x8cef])
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 2: assigned [io
0x8ce0-0x8ce7]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 2: set to [io
0x8ce0-0x8ce7] (PCI address [0x8ce0-0x8ce7])
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 1: assigned [io
0x8cdc-0x8cdf]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 1: set to [io
0x8cdc-0x8cdf] (PCI address [0x8cdc-0x8cdf])
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 3: assigned [io
0x8cd8-0x8cdb]
Dec 19 21:56:24 shambhala kernel: pci 0000:03:00.0: BAR 3: set to [io
0x8cd8-0x8cdb] (PCI address [0x8cd8-0x8cdb])
Dec 19 21:56:24 shambhala kernel: sata_sil 0000:03:00.0: enabling device
(0000 -> 0003)
Dec 19 21:56:24 shambhala kernel: sata_sil 0000:03:00.0: PCI INT A ->
Link[LNKA] -> GSI 11 (level, low) -> IRQ 11
Dec 19 21:56:24 shambhala kernel: sata_sil 0000:03:00.0: Applying R_ERR on
DMA activate FIS errata fix
Dec 19 21:56:24 shambhala kernel: sata_sil 0000:03:00.0: setting latency
timer to 64
Dec 19 21:56:24 shambhala kernel: scsi11 : sata_sil
Dec 19 21:56:24 shambhala kernel: scsi12 : sata_sil
Dec 19 21:56:24 shambhala kernel: ata9: SATA max UDMA/100 mmio
m512@0xcffffe00 tf 0xcffffe80 irq 11
Dec 19 21:56:24 shambhala kernel: ata10: SATA max UDMA/100 mmio
m512@0xcffffe00 tf 0xcffffec0 irq 11
Dec 19 21:56:24 shambhala kernel: ata9: SATA link down (SStatus 0 SControl
310)
Dec 19 21:56:24 shambhala kernel: ata10: SATA link down (SStatus 0
SControl 310)
Dec 19 21:56:27 shambhala kernel: ata9: hard resetting link
Dec 19 21:56:30 shambhala kernel: ata9: SATA link up 1.5 Gbps (SStatus 113
SControl 310)
Dec 19 21:56:30 shambhala kernel: ata9.00: ATA-8: Hitachi HTS545050B9A300,
PB4OC60G, max UDMA/133
Dec 19 21:56:30 shambhala kernel: ata9.00: 976773168 sectors, multi 0:
LBA48 NCQ (depth 0/32)
Dec 19 21:56:30 shambhala kernel: ata9.00: configured for UDMA/100
Dec 19 21:56:30 shambhala kernel: ata9: EH complete
Dec 19 21:56:30 shambhala kernel: scsi 11:0:0:0: Direct-Access ATA
Hitachi HTS54505 PB4O PQ: 0 ANSI: 5
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: Attached scsi generic sg2
type 0
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: [sdb] 976773168 512-byte
logical blocks: (500 GB/465 GiB)
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: [sdb] Write Protect is off
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: [sdb] Mode Sense: 00 3a 00
00
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: [sdb] Write cache: enabled,
read cache: enabled, doesn't support DPO
Dec 19 21:56:30 shambhala kernel: sdb: sdb1 sdb3
Dec 19 21:56:30 shambhala kernel: sd 11:0:0:0: [sdb] Attached SCSI disk
Removal appeared to be fine:

Dec 19 23:10:34 shambhala kernel: ata9.00: disabled
Dec 19 23:10:34 shambhala kernel: sd 11:0:0:0: [sdb] Synchronizing SCSI
cache
Dec 19 23:10:34 shambhala kernel: sd 11:0:0:0: [sdb] Result:
hostbyte=0x04 driverbyte=0x00
Dec 19 23:10:34 shambhala kernel: sd 11:0:0:0: [sdb] Stopping disk
Dec 19 23:10:34 shambhala kernel: sd 11:0:0:0: [sdb] START_STOP FAILED
Dec 19 23:10:34 shambhala kernel: sd 11:0:0:0: [sdb] Result:
hostbyte=0x04 driverbyte=0x00
Dec 19 23:10:34 shambhala kernel: sata_sil 0000:03:00.0: PCI INT A
disabled
Any hints on what to try to get more information? I keep the ThinkPad T42
running for a while to wait for some hints.

Thanks,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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