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Date: Tue, 5 Nov 2013 02:18:54 GMT
From: Howard Su <howard0su@gmail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Panic when read unalign in ddb
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         183668
>Category:       arm
>Synopsis:       [panic] Panic when read unalign in ddb
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    ian
>State:          patched
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Nov 05 02:20:00 UTC 2013
>Closed-Date:    
>Last-Modified:  Sun Apr 20 02:11:32 UTC 2014
>Originator:     Howard Su
>Release:        FreeBSD-Current
>Organization:
>Environment:
FreeBSD beaglebone 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r257039: Thu Oct 24 11:39:07 CET 2013
>Description:
when read some memory in DDB unalign, the system will get reset. this is inconsistent with i386 behavior.
>How-To-Repeat:
Ctrl-Break, enter DDB
type 'dump thread 1'
>Fix:
Index: sys/arm/arm/trap.c
===================================================================
--- sys/arm/arm/trap.c	(revision 257663)
+++ sys/arm/arm/trap.c	(working copy)
@@ -528,7 +528,8 @@
 
 #ifdef KDB
 	if (debugger_on_panic || kdb_active)
-		kdb_trap(fsr, 0, tf);
+		if (kdb_trap(fsr, 0, tf))
+			return 0;
 #endif
 	panic("Fatal abort");
 	/*NOTREACHED*/


>Release-Note:
>Audit-Trail:

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: arm/183668: commit references a PR
Date: Sat, 16 Nov 2013 23:38:03 +0000 (UTC)

 Author: ian
 Date: Sat Nov 16 23:37:56 2013
 New Revision: 258240
 URL: http://svnweb.freebsd.org/changeset/base/258240
 
 Log:
   In the data abort handler, don't panic if kdb is available and says it
   handled the condition.
   
   PR:		arm/183668
   Submitted by:	Howard Su <howard0su@gmail.com>
 
 Modified:
   head/sys/arm/arm/trap.c
 
 Modified: head/sys/arm/arm/trap.c
 ==============================================================================
 --- head/sys/arm/arm/trap.c	Sat Nov 16 21:58:58 2013	(r258239)
 +++ head/sys/arm/arm/trap.c	Sat Nov 16 23:37:56 2013	(r258240)
 @@ -528,7 +528,8 @@ dab_fatal(struct trapframe *tf, u_int fs
  
  #ifdef KDB
  	if (debugger_on_panic || kdb_active)
 -		kdb_trap(fsr, 0, tf);
 +		if (kdb_trap(fsr, 0, tf))
 +			return (0);
  #endif
  	panic("Fatal abort");
  	/*NOTREACHED*/
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State-Changed-From-To: open->patched 
State-Changed-By: linimon 
State-Changed-When: Sun Apr 20 02:10:57 UTC 2014 
State-Changed-Why:  
over to committer as possible MFC candidate. 


Responsible-Changed-From-To: freebsd-arm->ian 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Sun Apr 20 02:10:57 UTC 2014 
Responsible-Changed-Why:  

http://www.freebsd.org/cgi/query-pr.cgi?pr=183668 
>Unformatted:
