>Number:         36944
>Category:       kern
>Synopsis:       Unable to get core dump, kernel hangs after DDB "sync"
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 07 14:15:00 +0000 2007
>Originator:     Aleksej Saushev <asau@hotbox.ru>
>Release:        NetBSD 4.99.30
>Organization:
>Environment:
System: NetBSD asau.local 4.99.30 NetBSD 4.99.30 (KERN) #0: Fri Sep 7 08:16:28 MSD 2007 bsd@asau.local:/usr/obj/sys/arch/i386/compile/KERN i386
Architecture: i386
Machine: i386
>Description:
	On panic after entering "sync" command in DDB, system hangs.
	Without panic, when entering DDB on control-alt-escape
	key press, after "sync" kernel prints five times message

	piixide0:0:0:	 lost interrupt
		type: ata  tc_bcount: XXXX  tc_skip: 0

	where XXXX is 4096, 2048, 4096, 2048, 6144 respectivly.
	After that system hangs.

	I don't get any message concerning disk even under heavy usage,
	therefore I don't believe in hardware problem (suggestions to check?).

	Kernel is built with DIAGNOSTIC, DEBUG, LOCKDEBUG options.
>How-To-Repeat:
	Enter DDB, "sync".
>Fix:
	Unknown.