Bug 125450

Summary:	[panic] Removing USB flash card while being accessed causes kernel panic, even without device mounted
Product:	Base System	Reporter:	Simson L. Garfinkel <simsong>
Component:	usb	Assignee:	freebsd-usb (Nobody) <usb>
Status:	Closed Feedback Timeout
Severity:	Affects Only Me	CC:	miwi
Priority:	Normal
Version:	7.0-STABLE
Hardware:	Any
OS:	Any

Description Simson L. Garfinkel 2008-07-09 21:50:00 UTC

 1. insert a USB flash drive on /dev/da0
 2. dd if=/dev/da0 of=/dev/null
 3. WHile the dd is going, pull the flash drive
 
 FreeBSD panics

Fix: 

You guys have to do this.
How-To-Repeat:  
 Just do it again.

Comment 1 Mark Linimon freebsd_committer

2008-07-10 10:28:03 UTC

State Changed
From-To: open->closed

See http://www.freebsd.org/cgi/query-pr.cgi?pr=usb/46176 and subsequent 
(e.g. http://people.freebsd.org/~linimon/studies/prs/well_known_prs.html).

Comment 2 Mark Linimon freebsd_committer

2008-07-10 10:28:03 UTC

Responsible Changed
From-To: gnats-admin->freebsd-usb

Comment 3 Mark Linimon freebsd_committer

2008-07-10 19:28:01 UTC

State Changed
From-To: closed->open

re-open.

Comment 4 Mark Linimon 2008-07-10 19:29:02 UTC

we're going to need a stack trace, as well.

mcl

Comment 5 Simson L. Garfinkel 2008-07-10 20:19:00 UTC

I'm happy to get you a stack trace; it's easy to make this happen. How  
do I get a stack trace from a kernel panic?

On Jul 10, 2008, at 11:29 AM, Mark Linimon wrote:

> we're going to need a stack trace, as well.
>
> mcl
>

Comment 6 Eitan Adler freebsd_committer

2011-09-29 16:38:14 UTC

State Changed
From-To: open->feedback

run kgdb on the core file and type 'bt' Keep in mind that you need the 
same kernel as the one the dump was generated on