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kern/42662: iop driver makes kernel crash or freeze

>Number:         42662
>Category:       kern
>Synopsis:       iop driver makes kernel crash or freeze
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 22 17:50:01 +0000 2010
>Originator:     Aleksej Saushev <>
>Release:        NetBSD 5.99.24
Installation CD
Architecture: i386
Machine: i386
        5.0_STABLE installation kernel panics when initializing iop driver,
        5.99.24 kernel as of 2009-01-21 crashes too,
        5.99.24 kernel as of today doesn't crash, it freezes instead.

        All diagnostics below corresponds to 5.0_STABLE.

        Kernel message at panic:

        iop0 at pci3 dev 3 function 0: I2O adapterpanic: _bus_dmamap_sync: mix 
        fatal breakpoint trap in supervisor mode
        trap type 1 code 0 eip c057855c cs 246 cr2 0 ilevel 8

        Backtrace (recorded manually):

        breakpoint ()
        panic ()
        _bus_dmamap_sync () ... + 0x194
        iop_status_get () ... + 0xc7
        iop_init () ... + 0x529
        iop_pci_attach () ... + 0x1c7
        config_attach_loc () ... + 0x163
        pci_probe_device ()
        pci_enumerate_bus ()
        pcirescan ()
        pciattach ()
        config_attach_loc ()
        config_found_ia ()
        ppbatttach ()

        BIOS reports "ADAPTEC I2O BIOS v001.62 (2002/11/06)"

        Another, possibly unrelated problem affects only current:
        when disabling iop in userconf, current fails to mount root fs
        and starts probing for /sbin/init, /sbin/oinit and so on.
        Boot installation CD.

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