linux-kernel - Re: btrfs: hang on boot due to tests

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Message-ID: <CAL3q7H66cWoE0LzHZQ4bQV4h_WrnvXZ6sABjhtWfr6Ktuo8pFQ@mail.gmail.com>
Date:	Thu, 12 Jun 2014 00:14:56 +0100
From:	Filipe David Manana <fdmanana@...il.com>
To:	Ed Tomlinson <edt@....ca>
Cc:	Sasha Levin <sasha.levin@...cle.com>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>
Subject: Re: btrfs: hang on boot due to tests

On Tue, Jun 10, 2014 at 12:14 PM, Ed Tomlinson <edt@....ca> wrote:
> On Monday 09 June 2014 12:17:50 Sasha Levin wrote:
>> On 06/09/2014 11:59 AM, Chris Mason wrote:
>> > On 06/09/2014 11:16 AM, Sasha Levin wrote:
>> >> > Hi all,
>> >> >
>> >> > It seems that some recent changes to btrfs tests make it hang during boot:
>> >> >
>> >> > [   49.730033] NMI watchdog: BUG: soft lockup - CPU#34 stuck for 23s! [swapper/0:1]
>> >> > [   49.730033] Modules linked in:
>> >> > [   49.730033] hardirqs last enabled at (6389143): restore_args (arch/x86/kernel/entry_64.S:829)
>> >> > [   49.730033] hardirqs last disabled at (6389144): apic_timer_interrupt (arch/x86/kernel/entry_64.S:1021)
>> >> > [   49.730033] softirqs last enabled at (6389142): __do_softirq (./arch/x86/include/asm/preempt.h:22 kernel/softirq.c:296)
>> >> > [   49.730033] softirqs last disabled at (6389139): irq_exit (kernel/softirq.c:346 kernel/softirq.c:387)
>> >> > [   49.730033] CPU: 34 PID: 1 Comm: swapper/0 Not tainted 3.15.0-rc8-next-20140606-sasha-00021-ga9d3a0b-dirty #597
>> >
>> > This is 3.15-rc8 + linux-next?  I'll try to reproduce here, but the
>> > tests were working for me.
>>
>> Yes, it's the latest -next tree available.
>>
>> Also note that it doesn't happen every time, so might be some sort of a race?
>
> I've noticed that with -rc8 and now .15 btrfs fails to automount (or mount) about 1 in 2 times requiring a reboot to get it to work.
> I have not seen anything in logs.  Might this be related?

Hi Ed,

I think I ran into this too.
This patch should help you too:  https://patchwork.kernel.org/patch/4338641/

thanks

>
> Thanks,
>
> Ed Tomlinson
> --
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-- 
Filipe David Manana,

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 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."
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