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SubjectRe: SCSI Timeout, but no bus reset
On Tue, 22 Jun 1999, David B. Rees wrote:

> Under heavy SCSI disk load, my 2.2.10 SMB (dual P133) box is showing this
> error, but it never recovers. I haven't tried other kernels. I am using the
> standard NCR53C8XX driver, not the SYM53C8XX driver, with the default settings.

Mine's with 2.2.{9,10} and proposed-2.2.11pre[234] with aic7xxx (it's
happened 8 times now).

> scsi : aborting command due to timeout : pid 269291, scsi0, channel 0, id 0,
> lun 0 Read (10) 00 00 2d f9 08 00 00 02 00

Much the same as mine, but the command isn't always the same. More
details including 130k of logs available.

> I would expect the driver to reset the SCSI card and recover, but it never

Me too.

> does, and the only thing left to do is to SysRq Boot.

As mine's only a CD writer I can reboot cleanly, but I can't rmmod the
module and any processes that try using it go into uninterruptable sleep.

> Here is the relevant section of dmesg, let me know if you need more
> information. I can get this to happen by simply doing a large copy (couple
> hundred megabytes) between the two disks.

I can't get mine to happen, it just does occasionally. I'm running a
kernel with DEBUG_TIMEOUT defined in scsi_obsolete.c at the moment, but
nothing's gone wrong yet.

> ncr53c8xx: at PCI bus 0, device 14, function 0
> ncr53c8xx: 53c875 detected with Tekram NVRAM
> ncr53c875-0: rev=0x03, base=0xfedff800, io_port=0xf800, irq=11
> ncr53c875-0: Tekram format NVRAM, ID 7, Fast-20, Parity Checking
> ncr53c875-0: on-chip RAM at 0xfedfe000
> ncr53c875-0: restart (scsi reset).
> ncr53c875-0: Downloading SCSI SCRIPTS.
> scsi0 : ncr53c8xx - version 3.2
> scsi : 1 host.
> Vendor: HP Model: C3010 Rev: 0BB4
> Type: Direct-Access ANSI SCSI revision: 02
> Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
> Vendor: SEAGATE Model: ST32430N Rev: 0320
> Type: Direct-Access ANSI SCSI revision: 02
> Detected scsi disk sdb at scsi0, channel 0, id 3, lun 0
> ncr53c875-0-<0,0>: tagged command queue depth set to 4
> ncr53c875-0-<3,0>: tagged command queue depth set to 4
> scsi : detected 2 SCSI disks total.
> ncr53c875-0-<0,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8)
> SCSI device sda: hdwr sector= 512 bytes. Sectors= 3912172 [1910 MB] [1.9 GB]
> ncr53c875-0-<3,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 15)
> SCSI device sdb: hdwr sector= 512 bytes. Sectors= 4197405 [2049 MB] [2.0 GB]

(scsi0) <Adaptec AIC-7895 Ultra SCSI host adapter> found at PCI 12/0
(scsi0) Wide Channel A, SCSI ID=7, 32/255 SCBs
(scsi0) Downloading sequencer code... 374 instructions downloaded
(scsi1) <Adaptec AIC-7895 Ultra SCSI host adapter> found at PCI 12/1
(scsi1) Wide Channel B, SCSI ID=7, 32/255 SCBs
(scsi1) Downloading sequencer code... 374 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.19/3.2.4
<Adaptec AIC-7895 Ultra SCSI host adapter>
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.19/3.2.4
<Adaptec AIC-7895 Ultra SCSI host adapter>
scsi : 2 hosts.
(scsi0:0:4:0) Synchronous at 10.0 Mbyte/sec, offset 15.
Vendor: PHILIPS Model: CDD3600 CD-R/RW Rev: 2.00
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 4, lun 0
sr0: scsi3-mmc drive: 2x/6x writer cd/rw xa/form2 cdda tray
Uniform CDROM driver Revision: 2.55

--
Tim
Quidquid latine dictum sit, altum viditur.


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