NetBSD Problem Report #44627

From jruohone@gmail.com  Wed Feb 23 07:00:55 2011
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Date: Wed, 23 Feb 2011 09:00:42 +0200 (EET)
From: Jukka Ruohonen <jruohonen@iki.fi>
Sender: a b <jruohone@gmail.com>
Reply-To: jruohonen@iki.fi
To: gnats-bugs@gnats.NetBSD.org
Subject: genfb(4) panic at shutdown
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>Number:         44627
>Category:       port-amd64
>Synopsis:       genfb(4) panic at shutdown
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 23 07:05:00 +0000 2011
>Closed-Date:    Wed Feb 23 12:31:15 +0000 2011
>Last-Modified:  Wed Feb 23 12:31:15 +0000 2011
>Originator:     Jukka Ruohonen
>Release:        5.99.46
>Organization:
-
>Environment:
>Description:

A reproducable genfb(4) related panic in HEAD:

syscall() at netbsd:syscall+0xaa
sys_reboot() at netbsd:sys_reboot+0x73
cpu_reboot() at netbsd:cpu_reboot+0x2f
pmf_system_shutdown() at netbsd:device_pmf_driver_shutdown+0x12
pci_genfb_shutdown() at netbsd:pci_genfb_shutdown+0x9
genfb_enable_polling() at netbsd:genfb_enable_polling+0x24
vcons_hard_switch() at netbsd:vcons_hard_switch+0xb
Stopped in pid 21146.1 (reboot) at netbsd vcons_hard_switch+0xb:
movq 0 xc0(%rdx), %rax

>How-To-Repeat:

Just shutdown.

>Fix:

Unknown.

>Release-Note:

>Audit-Trail:
From: Jukka Ruohonen <jruohonen@iki.fi>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: port-amd64/44627: genfb(4) panic at shutdown
Date: Wed, 23 Feb 2011 09:11:37 +0200

 On Wed, Feb 23, 2011 at 07:05:00AM +0000, Jukka Ruohonen wrote:
 > syscall() at netbsd:syscall+0xaa
 > sys_reboot() at netbsd:sys_reboot+0x73
 > cpu_reboot() at netbsd:cpu_reboot+0x2f
 > pmf_system_shutdown() at netbsd:device_pmf_driver_shutdown+0x12
 > pci_genfb_shutdown() at netbsd:pci_genfb_shutdown+0x9
 > genfb_enable_polling() at netbsd:genfb_enable_polling+0x24
 > vcons_hard_switch() at netbsd:vcons_hard_switch+0xb
 > Stopped in pid 21146.1 (reboot) at netbsd vcons_hard_switch+0xb:
 > movq 0 xc0(%rdx), %rax

 Looks like a locking error:

 	cpu_reboot() -> splhigh() ->

 	...

 	pci_genfb_shutdown() -> genfb_enable_polling() -> 
 	vcons_enable_polling() -> vcons_redraw_screen() ->
 	vcons_lock() -> splhigh().

 Or something along these lines.	

From: matthew green <mrg@eterna.com.au>
To: gnats-bugs@NetBSD.org
Cc: port-amd64-maintainer@netbsd.org, gnats-admin@netbsd.org,
    netbsd-bugs@netbsd.org
Subject: re: port-amd64/44627: genfb(4) panic at shutdown
Date: Wed, 23 Feb 2011 19:10:19 +1100

 > pci_genfb_shutdown() at netbsd:pci_genfb_shutdown+0x9
 > genfb_enable_polling() at netbsd:genfb_enable_polling+0x24
 > vcons_hard_switch() at netbsd:vcons_hard_switch+0xb
 > Stopped in pid 21146.1 (reboot) at netbsd vcons_hard_switch+0xb:

 pretty sure this is already fixed.

 make sure you have genfb.c 1.38.


 .mrg.

State-Changed-From-To: open->closed
State-Changed-By: jruoho@NetBSD.org
State-Changed-When: Wed, 23 Feb 2011 12:31:15 +0000
State-Changed-Why:
Indeed fixed in revision 1.38.


>Unformatted:

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