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From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Amit Shah <amit.shah@redhat.com>
Cc: Sachin Sant <sachinp@in.ibm.com>,
	Greg Kroah-Hartman <gregkh@suse.de>,
	a.p.zijlstra@chello.nl, Rusty Russell <rusty@rustcorp.com.au>,
	linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
	Anton Blanchard <anton@samba.org>,
	tglx@linutronix.de,
	Linus Torvalds <torvalds@linux-foundation.org>,
	mingo@elte.hu, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc_remove
Date: Fri, 26 Mar 2010 21:54:16 +1100	[thread overview]
Message-ID: <20100326215416.80d09610.sfr@canb.auug.org.au> (raw)
In-Reply-To: <20100326095821.GA7039@amit-x200.redhat.com>

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Hi Amit,

On Fri, 26 Mar 2010 15:28:21 +0530 Amit Shah <amit.shah@redhat.com> wrote:
>
> On (Fri) Mar 26 2010 [14:43:56], Sachin Sant wrote:
> >
> > I too ran into this issue as reported by Anton. Unfortunately in my
> > case the following suggested patch does not help boot the powerpc
> > box successfully. The boot still hangs with following messages

I have been getting this on my linux-next boot tests for a while as well.

> Was the hang you saw before applying this patch at the same place / for
> the same reason?

I get the same hangs with and without the patch.  Paulus bisected it
(again) to the commit below and reverting that commit fixes the problem.

> OK, this gets even murkier. I don't know why taking a few krefs modifies
> hvc_console behaviour to such an extent.
> 
> > Just to confirm i too am facing same issue as reported by Anton,
> > reverted commit e74d098c66543d0731de62eb747ccd5b636a6f4c and that allowed
> > by box to boot successfully.
> 
> Which module uses hvc_console in your case?

I assume hcv_vio.

I also tested using "init=/bin/bash" as a kernel command line option and
the console worked while I was running bash, but everything was very
sluggish.  Then when I did "exec /sbin/init" the console hung completely
- sysrq (^O) didn't even work any more (it did while I was running bash).

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

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  reply	other threads:[~2010-03-26 10:54 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-19 15:13 [GIT PATCH] TTY fixes for 2.6.34-git Greg KH
2010-03-19 15:18 ` [PATCH 1/7] Revert "tty: Add a new VT mode which is like VT_PROCESS but doesn't require a VT_RELDISP ioctl call" Greg Kroah-Hartman
2010-03-19 15:18 ` [PATCH 2/7] tty: Take a 256 byte padding into account when buffering below sub-page units Greg Kroah-Hartman
2010-03-19 15:18 ` [PATCH 3/7] uartlite: Fix build on sparc Greg Kroah-Hartman
2010-03-19 16:15   ` Grant Likely
2010-03-19 16:26     ` Grant Likely
2010-03-26 14:31   ` Michal Simek
2010-03-19 15:18 ` [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc_remove Greg Kroah-Hartman
2010-03-20 21:04   ` Benjamin Herrenschmidt
2010-03-21  4:37     ` Amit Shah
2010-03-24 12:19       ` Amit Shah
2010-03-25 23:30         ` Anton Blanchard
2010-03-26  2:01           ` Amit Shah
2010-03-26  9:13         ` Sachin Sant
2010-03-26  9:58           ` Amit Shah
2010-03-26 10:54             ` Stephen Rothwell [this message]
2010-03-26 11:42             ` Sachin Sant
2010-03-26 11:52               ` Alan Cox
2010-03-26 12:49                 ` Amit Shah
2010-03-26 12:43               ` Amit Shah
2010-04-06 11:42                 ` Anton Blanchard
2010-04-06 12:09                   ` Amit Shah
2010-04-06 12:27                   ` Sachin Sant
2010-04-06 12:32                   ` Alan Cox
2010-04-08  0:26                   ` Rusty Russell
2010-03-24 10:45     ` Benjamin Herrenschmidt
2010-03-24 10:57       ` Amit Shah
2010-03-24 11:37     ` Alan Cox
2010-03-24 15:05       ` Amit Shah
2010-03-19 15:18 ` [PATCH 5/7] tty_buffer: Fix distinct type warning Greg Kroah-Hartman
2010-03-19 15:18 ` [PATCH 6/7] tty: cpm_uart: use resource_size() Greg Kroah-Hartman
2010-03-19 15:18 ` [PATCH 7/7] tty_port,usb-console: Fix usb serial console open/close regression Greg Kroah-Hartman

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