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port-i386/40449: disk errors after ACPI suspend/resume

>Number:         40449
>Category:       port-i386
>Synopsis:       disk errors after ACPI suspend/resume
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 21 18:00:00 +0000 2009
>Originator:     Alan Barrett
>Release:        NetBSD 5.99.1
Not much
System: NetBSD 5.99.10 i386
Architecture: i386
Machine: i386

If I suspend the system via sysctl -w machdep.sleep_state=3 and
then resume, a consant stream of disk error messages appears.
The errors look like this:

wd0e: error reading fsbn blah blah retrying
wd0: (aborted command)
cgd1: error 5

There are several pairs of wd0e and wd0 messages for each cgd1 message.
The block numbers in the wd0e messages repeat a few times and then
change.  The errors scroll past rapidly and continuously.  The only
obvious way to recover it to power cycle the machine.

wd0 is an ordinary laptop SATA disk attached to an Intel
82801GBM/GHM controller (configured in the BIOS for compatibility
mode).  Here are some config messages:

    piixide0 at pci0 dev 31 function 2
    piixide0: Intel 82801GBM/GHM Serial ATA Controller (ICH7) (rev. 0x01)
    piixide0: bus-master DMA support present
    piixide0: primary channel wired to compatibility mode
    ioapic0: int14 0x69<vector=0x69,delmode=0x0,dest=0x0> 0x0<target=0x0>
    piixide0: primary channel interrupting at ioapic0 pin 14
    atabus0 at piixide0 channel 0

    wd0 at atabus0 drive 0: <Hitachi HTS542520K9SA00>
    wd0: drive supports 16-sector PIO transfers, LBA48 addressing
    wd0: 186 GB, 387621 cyl, 16 head, 63 sec, 512 bytes/sect x 390721968 sectors
    rnd: wd0 attached as an entropy source (collecting and estimating)
    wd0: 32-bit data port
    wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
    wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using 

The disk has an MBR and a NetBSD disklabel.  wd0e is one of the disklabel

cgd1 used wd0e as its backing store.

suspend, then resume.


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