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Re: XFS crash?

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS crash?
From: Austin Schuh <austin@xxxxxxxxxxxxxxxx>
Date: Wed, 5 Mar 2014 16:53:06 -0800
Cc: xfs <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140305233551.GK6851@dastard>
References: <CANGgnMYPLF+8616Rs9eQOXUc9He2NSgFnNrvHvepV-x+pWS6oQ@xxxxxxxxxxxxxx> <20140305233551.GK6851@dastard>
Hi Dave,

On Wed, Mar 5, 2014 at 3:35 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
> On Wed, Mar 05, 2014 at 03:08:16PM -0800, Austin Schuh wrote:
>> Howdy,
>>
>> I'm running a config_preempt_rt patched version of the 3.10.11 kernel,
>> and I'm seeing a couple lockups and crashes which I think are related
>> to XFS.
>
> I think they ar emore likely related to RT issues....
>

That very well may be true.

> Your usb device has disconnected and gone down the device
> removal/invalidate partition route. and it's trying to flush the
> device, which is stuck on IO completion which is stuck waiting for
> the device error handling to error them out.
>
> So, this is a block device problem error handling problem caused by
> device unplug getting stuck because it's decided to ask the
> filesystem to complete operations that can't be completed until the
> device error handling progress far enough to error out the IOs that
> the filesystem is waiting for completion on.
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@xxxxxxxxxxxxx

I unplugged the USB device _after_ the rest of the system started
locking up to see if that might unstick things.

Austin

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