NetBSD Problem Report #40734

From www@NetBSD.org  Tue Feb 24 12:28:18 2009
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Date: Tue, 24 Feb 2009 12:26:40 +0000 (UTC)
From: Christoph_Egger@gmx.de
Reply-To: Christoph_Egger@gmx.de
To: gnats-bugs@NetBSD.org
Subject: crash in comintr()
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>Number:         40734
>Category:       kern
>Synopsis:       crash in comintr()
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 24 12:30:00 +0000 2009
>Last-Modified:  Wed May 06 07:30:03 +0000 2009
>Originator:     Christoph Egger
>Release:        5.99.7
>Organization:
>Environment:
NetBSD/amd64 5.99.7
>Description:

Run NetBSD/amd64 with serial console.

<dmesg snippet>
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
</dmesg snippet>

Very rarely a sudden crash happens in sys/dev/ic/com.c:comintr()
in this line:

iir = CSR_READ_1(regsp, COM_REG_IIR);

regsp is a NULL pointer when the crash happens.

fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip 0xffffffff802380d5 cs 8 rflags 202 cr2 ffff80004e810000 cpl 8 rsp ffff80004ba75ad8
db> bt
breakpoint+0x5
comintr+0x53a
Xintr_ioapic_edge10+0xef
--- interrupt ---
x86_stihlt+0x6
idle_loop+0x198
db> machine cpu 1
Using cpu 1
db> bt
acpitimer_read_safe+0x18
binuptime+0x3b
mi_switch+0x4a
idle_loop+0xda


>How-To-Repeat:

>Fix:

>Audit-Trail:
From: Christoph Egger <cegger@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/40734 CVS commit: src/sys/dev/ic
Date: Wed, 6 May 2009 07:27:43 +0000

 Module Name:	src
 Committed By:	cegger
 Date:		Wed May  6 07:27:43 UTC 2009

 Modified Files:
 	src/sys/dev/ic: com.c

 Log Message:
 add KASSERT to identify when PR kern/40734 happens again.
 It happened to me twice and to Emmanuel Dreyfus (reported on port-amd64 ML)


 To generate a diff of this commit:
 cvs rdiff -u -r1.287 -r1.288 src/sys/dev/ic/com.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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