>Number:         7853
>Category:       kern
>Synopsis:       SCSIPI panic under heavy disk I/O
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 25 08:50:01 1999
>Last-Modified:
>Originator:     Paul Dokas
>Organization:
	University of Minnesota, Dept of Computer Science
>Release:        NetBSD-current as of Jun 25
>Environment:
	
System: NetBSD caligula 1.4D NetBSD 1.4D (CTHULHU) #6: Fri Jun 25 09:09:59 CDT 1999 root@caligula:/big/src/sys/arch/i386/compile/CTHULHU i386


>Description:

    While doing a 'make build', I decided to listen to a CD with the ATAPI CDROM
    using xmcd.  After about 10 minutes, the machine locked up, but the audio
    kept playing.

    I killed off xdm so that it would drop into ddb, and got this when I attempted
    to reboot:

    panic:  pr_enter
    Stopped in xmcd at      _Debugger+0x4:  leave
    db> reboot
    pool scxspl: reentrancy at file ../../../../dev/scsipi/scsipi_base.c line 112
             previous entry at file ../../../../dev/scsipi/scsipi_base.c line 156
    panic:  pr_enter
    Stopped in xmcd at      _Debugger+0x4:  leave


    To make matters even more complex, I've got /usr/src on a 2 9.0 GB SCSI disks
    configured as a RAID 0 hanging off of an ahc0 controller.  There was *lots* of
    disk activity when the panic occurred.

    I have no problems listening to music with xmcd when the system is otherwise
    quiet.
    
>How-To-Repeat:

    Play an audio CD while doing a 'make build' in /usr/src.

>Fix:

    Unknown.
>Audit-Trail:
>Unformatted: