linux-kernel - Re: [BUG] at drivers/char/vt.c:3332 do_blank

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Message-Id: <200702221453.18153.caglar@pardus.org.tr>
Date:	Thu, 22 Feb 2007 14:53:15 +0200
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	"Antonino A. Daplas" <adaplas@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	lkml <linux-kernel@...r.kernel.org>, spock@...too.org
Subject: Re: [BUG] at drivers/char/vt.c:3332 do_blank_screen() on resume

Hi;

22 Şub 2007 Per tarihinde, Antonino A. Daplas şunları yazmıştı: 
> On Thu, 2007-02-15 at 13:00 +0200, S.Çağlar Onur wrote:
> > 15 Şub 2007 Per tarihinde, Andrew Morton şunları yazmıştı:
> > > On Thu, 15 Feb 2007 11:40:32 +0100 Pavel Machek <pavel@....cz> wrote:
> > > > Contact fbcon people...
> > >
> > > There aren't any, basically.  Since Tony disappeared James has been
> > > helping out but doesn't have a lot of time.  So we're pretty much on
> > > our own with problems in this area.
> >
> > I already sent same mail to
> > linux-fbdev-devel mailing lists at sf.net with hope :)
> >
> > Cheers
>
> Interesting... It does look like this was triggered by calling
> do_blank_screen() without taking the console semaphore, but
> console_callback() should have taken that.
>
> Second point is that vesafb does not have any blanking functionality,
> thus it should not trigger fbcon_event_notify().  My guess is you are
> using an out-of-tree vesafb?

As i wrote we are using vesafb-tng [http://dev.gentoo.org/~spock/projects/] 
for a long time but this hits me only with 2.6.20 and only after 
suspend2disk, so im adding Michał Januszewski to CC if this is vesafb-tng 
related :).

> BUG: at drivers/char/vt.c:3332 do_blank_screen()
>  [<c02881f7>] do_blank_screen+0x4e/0x218
>  [<c02977fa>] fbcon_event_notify+0x8f1/0xa1e
>  [<c027b2b0>] extract_buf+0xac/0xe1
>  [<c0102002>] __switch_to+0xeb/0x15d
>  [<c034bbe5>] __sched_text_start+0x865/0x929
>  [<c029a50d>] bit_cursor+0x4c8/0x50b
>  [<c034bd67>] wait_for_completion+0x79/0xaf
>  [<c011cbe2>] default_wake_function+0x0/0xc
>  [<c034ece2>] notifier_call_chain+0x19/0x32
>  [<c012d1c6>] blocking_notifier_call_chain+0x23/0x33
>  [<c028db54>] fb_blank+0x4a/0x53
>  [<c0299028>] fbcon_blank+0xf4/0x1e3
>  [<c0294f33>] fbcon_cursor+0x21c/0x250
>  [<c029a045>] bit_cursor+0x0/0x50b
>  [<c0129e90>] lock_timer_base+0x15/0x2f
>  [<c0129eee>] try_to_del_timer_sync+0x44/0x4a
>  [<c0298f34>] fbcon_blank+0x0/0x1e3
>  [<c028835a>] do_blank_screen+0x1b1/0x218
>  [<c028abdd>] console_callback+0xaf/0xbf
>  [<c012fa59>] run_workqueue+0x85/0x135
>  [<c028ab2e>] console_callback+0x0/0xbf
>  [<c01302f0>] worker_thread+0x10a/0x136
>  [<c011cbe2>] default_wake_function+0x0/0xc
>  [<c01301e6>] worker_thread+0x0/0x136
>  [<c0132982>] kthread+0xb2/0xdc
>  [<c01328d0>] kthread+0x0/0xdc
>  [<c0103a8f>] kernel_thread_helper+0x7/0x10
>
> As for the last tracing, it looks to be valid bug to me.
> complete_change_console() should be called with the console sem
> taken. I'll look into this.

If testing needed just ask please :)

> BUG: at drivers/char/vt.c:3486 set_palette()
>  [<c0287538>] set_palette+0x41/0x59
>  [<c028886f>] redraw_screen+0x110/0x17e
>  [<c0282394>] complete_change_console+0x2a/0xba
>  [<c028ab73>] console_callback+0x45/0xbf
>  [<c012fa59>] run_workqueue+0x85/0x135
>  [<c028ab2e>] console_callback+0x0/0xbf
>  [<c01302f0>] worker_thread+0x10a/0x136
>  [<c011cbe2>] default_wake_function+0x0/0xc
>  [<c01301e6>] worker_thread+0x0/0x136
>  [<c0132982>] kthread+0xb2/0xdc
>  [<c01328d0>] kthread+0x0/0xdc
>  [<c0103a8f>] kernel_thread_helper+0x7/0x10
>
> Tony

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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