Date: Wed, 22 Feb 2006 18:04:34 GMT From: Nate Nielsen <nielsen@memberwebs.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/93720: Kernel Dump to USB umass device Message-ID: <200602221804.k1MI4YOd072582@www.freebsd.org> Resent-Message-ID: <200602221810.k1MIA5VI035474@freefall.freebsd.org>
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>Number: 93720
>Category: kern
>Synopsis: Kernel Dump to USB umass device
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Wed Feb 22 18:10:04 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Nate Nielsen
>Release: RELENG_6
>Organization:
None
>Environment:
FreeBSD 6.1-PRERELEASE #0: Wed Feb 22 02:07:41 UTC 2006 root@mesh-stable.ws.local:/usr/src/sys/i386/compile/DCUSTOM
>Description:
When working on systems with limited disk space, it's handy to be able to dump kernel memory (after a panic) to a USB device. Currently when dumping to a umass device you get something like:
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x0
> fault code = supervisor write, page not present
> instruction pointer = 0x20:0xc0cea412
> stack pointer = 0x28:0xc6cf5c1c
> frame pointer = 0x28:0xc6cf5c24
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 473 (kldload)
> trap number = 12
> panic: page fault
> Uptime: 3m48s
> Dumping 95 MB (2 chunks)
> Aborting dump due to I/O error.
> status == 0xb, scsi status == 0x0
>
> ** DUMP FAILED (ERROR 5) **
> Automatic reboot in 5 seconds - press a key on the console to abort
>How-To-Repeat:
>Fix:
I'll attach a patch (partly from Ian Dowse) which enables this functionality.
>Release-Note:
>Audit-Trail:
>Unformatted:
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