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Re: use-after-free on log replay failure

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: use-after-free on log replay failure
From: Alex Lyakas <alex@xxxxxxxxxxxxxxxxx>
Date: Wed, 6 Aug 2014 13:05:34 +0300
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140804230721.GA20518@dastard>
References: <A0A556BD24EC45CEADAA07870B3E6205@alyakaslap> <20140113030230.GF3469@dastard> <CAOcd+r0B-4SPjzim=68w3L8Y9FxwBD-C5HkkeO58C6t9nfgbhw@xxxxxxxxxxxxxx> <20140113204314.GJ3469@dastard> <CAOcd+r22FirPMHjdxQyTmXOAM72ND-t0=njK9nEmesSV5=Ec=Q@xxxxxxxxxxxxxx> <20140115014503.GQ3469@dastard> <CAOcd+r0R6KxmgEJNPUZ0Q5cQhsStGb=cehYE0+wKgDNU1negsA@xxxxxxxxxxxxxx> <20140119231745.GF18112@dastard> <4B2A412C75324EE9880358513C069476@alyakaslap> <9D3CBECB663B4A77B7EF74B67973310A@alyakaslap> <20140804230721.GA20518@dastard>
Hi Dave,

On Tue, Aug 5, 2014 at 2:07 AM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
> On Mon, Aug 04, 2014 at 02:00:05PM +0300, Alex Lyakas wrote:
>> Greetings,
>>
>> we had a log replay failure due to some errors that the underlying
>> block device returned:
>> [49133.801406] XFS (dm-95): metadata I/O error: block 0x270e8c180
>> ("xlog_recover_iodone") error 28 numblks 16
>> [49133.802495] XFS (dm-95): log mount/recovery failed: error 28
>> [49133.802644] XFS (dm-95): log mount failed
>
> #define ENOSPC          28      /* No space left on device */
>
> You're getting an ENOSPC as a metadata IO error during log recovery?
> Thin provisioning problem, perhaps,
Yes, it is a thin provisioning problem (which I already know the cause for).

> and the error is occurring on
> submission rather than completion? If so:
>
> 8d6c121 xfs: fix buffer use after free on IO error
I am not sure what do you mean by "submission rather than completion".
Do you mean that xfs_buf_ioapply_map() returns without submitting any
bios? In that case, no, bios are submitted to the block device, and it
fails them through a different context with ENOSPC error. I will still
try the patch you mentioned, because it also looks relevant to another
question I addressed to you earlier in:
http://oss.sgi.com/archives/xfs/2013-11/msg00648.html

Thanks,
Alex.


>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@xxxxxxxxxxxxx

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