NetBSD Problem Report #43290

From bch@methodlogic.net  Tue May 11 19:51:06 2010
Return-Path: <bch@methodlogic.net>
Received: from mail.netbsd.org (mail.netbsd.org [204.152.190.11])
	by www.NetBSD.org (Postfix) with ESMTP id D333863BA59
	for <gnats-bugs@gnats.NetBSD.org>; Tue, 11 May 2010 19:51:06 +0000 (UTC)
Message-Id: <20100511203144.GC3395@methodlogic.net>
Date: Tue, 11 May 2010 20:31:44 +0000
From: bch@methodlogic.net
Reply-To:
To: gnats-bugs@gnats.NetBSD.org
Subject: kern crash on socket read/write amd64 -current
X-Send-Pr-Version: 3.95

>Number:         43290
>Category:       kern
>Synopsis:       crash system networking on lo0
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 11 19:55:00 +0000 2010
>Last-Modified:  Sun Jun 12 23:20:02 +0000 2011
>Originator:     bch@methodlogic.net
>Release:        NetBSD 5.99.29
>Organization:
	Method Logic Digital
	http://methodlogic.net
>Environment:
System: NetBSD kamloops 5.99.29 NetBSD 5.99.29 (kamloops) #30: Mon May 10 22:55:08 PDT 2010 root@kamloops:/usr/obj/sys/arch/amd64/compile/kamloops amd64
Architecture: x86_64
Machine: amd64
>Description:
	Transcribed by hand from ddb output:

	uvm_fault(0xffff80004e7e8a30, 0x0, 1) -> e
	fatal page fault in supervisor mode
	trap type 6 code 0 rip ffffffff803ded94 cs 8 rflags 10286 cr2 40 cpl 0 rsp ffff8000437cd6f0
	kernel: page fault trap, code 0
	Stopped in pid 479.1 (netstat) at netbsd:kath_cred_getuid + 0x4: movl 0 x40 (%rdi), %eax
>How-To-Repeat:
	Was observing no reponse on network socket (which should
	have held data), then ran netstat. Seems to be a specific
	test case which generates fault, which I can elaborate on
	offline if required.

	On the same host, I was listening on a socket, writing to it,
	observing no response, then ran netstat and crashed the system.

>Fix:


>Audit-Trail:
From: David Holland <dholland-bugs@netbsd.org>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: kern/43290: kern crash on socket read/write amd64 -current
Date: Sun, 12 Jun 2011 23:19:06 +0000

 On Tue, May 11, 2010 at 07:55:00PM +0000, bch@methodlogic.net wrote:
  > 	kernel: page fault trap, code 0
  > 	Stopped in pid 479.1 (netstat) at netbsd:kath_cred_getuid + 0x4:
  > movl 0x40 (%rdi), %eax
  >
  >
  > >How-To-Repeat:
  > 	Was observing no reponse on network socket (which should
  > 	have held data), then ran netstat. Seems to be a specific
  > 	test case which generates fault, which I can elaborate on
  > 	offline if required.
  > 
  > 	On the same host, I was listening on a socket, writing to it,
  > 	observing no response, then ran netstat and crashed the system.

 Did anyone ever look into this? If you see it again, try to get a
 backtrace; it will be a lot easier to figure if we know what's calling
 kauth_cred_getuid.

 -- 
 David A. Holland
 dholland@netbsd.org

Home	PR Database Search