ATA scsi driver misbehavior under kdump capture kernel

[cpw@sgi.com (Cliff Wickman)]

I've run into a problem with the ATA SCSI disk driver when running in a
kdump dump-capture kernel.

I'm running on 2-processor x86_64 box.  It has 2 scsi disks, /dev/sda and
/dev/sdb

My kernel is 2.6.22, and built to be a dump capturing kernel loaded by kexec.
When I boot this kernel by itself, it finds both sda and sdb.

But when it is loaded by kexec and booted on a panic it only finds sda.

Any ideas from those familiar with the ATA driver?


-Cliff Wickman
 SGI



I put some printk's into it and get this:

Standalone:

                                                   [nv_adma_error_handler]
cpw: ata_host_register probe port 1 (error_handler:ffffffff81348625)
cpw: ata_host_register call ata_port_probe
cpw: ata_host_register call ata_port_schedule
cpw: ata_host_register call ata_port_wait_eh
cpw: ata_port_wait_eh entered
cpw: ata_port_wait_eh, preparing to wait
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
cpw: ata_dev_configure entered
cpw: ata_dev_configure testing class
cpw: ata_dev_configure class is ATA_DEV_ATA
ata2.00: ATA-6: ST3200822AS, 3.01, max UDMA/133
ata2.00: 390721968 sectors, multi 16: LBA48
cpw: ata_dev_configure exiting
cpw: ata_dev_configure entered
cpw: ata_dev_configure testing class
cpw: ata_dev_configure class is ATA_DEV_ATA
cpw: ata_dev_configure exiting
cpw: ata_dev_set_mode printing:
ata2.00: configured for UDMA/133
cpw: ata_port_wait_eh, finished wait
cpw: ata_port_wait_eh exiting
cpw: ata_host_register done with probe port 1


When loaded with kexec and booted on a panic:

cpw: ata_host_register probe port 1 (error_handler:ffffffff81348625)
cpw: ata_host_register call ata_port_probe
cpw: ata_host_register call ata_port_schedule
cpw: ata_host_register call ata_port_wait_eh
cpw: ata_port_wait_eh entered
cpw: ata_port_wait_eh, preparing to wait
ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
cpw: ata_port_wait_eh, finished wait
cpw: ata_port_wait_eh exiting
cpw: ata_host_register done with probe port 1

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