Subject: kern/36944: Unable to get core dump, kernel hangs after DDB "sync"
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: Aleksej Saushev <asau@hotbox.ru>
List: netbsd-bugs
Date: 09/07/2007 14:15:01
>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.