linux-kernel - Re: [RFC PATCH v3 0/9] fsdax: introduce fs query to support reflink

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Date:   Fri, 18 Dec 2020 17:13:23 +0800
From:   Ruan Shiyang <ruansy.fnst@...fujitsu.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
CC:     Jane Chu <jane.chu@...cle.com>, <linux-kernel@...r.kernel.org>,
        <linux-xfs@...r.kernel.org>, <linux-nvdimm@...ts.01.org>,
        <linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-raid@...r.kernel.org>, <dan.j.williams@...el.com>,
        <david@...morbit.com>, <hch@....de>, <song@...nel.org>,
        <rgoldwyn@...e.de>, <qi.fuli@...itsu.com>, <y-goto@...itsu.com>
Subject: Re: [RFC PATCH v3 0/9] fsdax: introduce fs query to support reflink



On 2020/12/18 上午11:49, Darrick J. Wong wrote:
> On Fri, Dec 18, 2020 at 10:44:26AM +0800, Ruan Shiyang wrote:
>>
>>
>> On 2020/12/17 上午4:55, Jane Chu wrote:
>>> Hi, Shiyang,
>>>
>>> On 12/15/2020 4:14 AM, Shiyang Ruan wrote:
>>>> The call trace is like this:
>>>> memory_failure()
>>>>    pgmap->ops->memory_failure()      => pmem_pgmap_memory_failure()
>>>>     gendisk->fops->corrupted_range() => - pmem_corrupted_range()
>>>>                                         - md_blk_corrupted_range()
>>>>      sb->s_ops->currupted_range()    => xfs_fs_corrupted_range()
>>>>       xfs_rmap_query_range()
>>>>        xfs_currupt_helper()
>>>>         * corrupted on metadata
>>>>             try to recover data, call xfs_force_shutdown()
>>>>         * corrupted on file data
>>>>             try to recover data, call mf_dax_mapping_kill_procs()
>>>>
>>>> The fsdax & reflink support for XFS is not contained in this patchset.
>>>>
>>>> (Rebased on v5.10)
>>>
>>> So I tried the patchset with pmem error injection, the SIGBUS payload
>>> does not look right -
>>>
>>> ** SIGBUS(7): **
>>> ** si_addr(0x(nil)), si_lsb(0xC), si_code(0x4, BUS_MCEERR_AR) **
>>>
>>> I expect the payload looks like
>>>
>>> ** si_addr(0x7f3672e00000), si_lsb(0x15), si_code(0x4, BUS_MCEERR_AR) **
>>
>> Thanks for testing.  I test the SIGBUS by writing a program which calls
>> madvise(... ,MADV_HWPOISON) to inject memory-failure.  It just shows that
>> the program is killed by SIGBUS.  I cannot get any detail from it.  So,
>> could you please show me the right way(test tools) to test it?
> 
> I'm assuming that Jane is using a program that calls sigaction to
> install a SIGBUS handler, and dumps the entire siginfo_t structure
> whenever it receives one...

OK.  Let me try it and figure out what's wrong in it.


--
Thanks,
Ruan Shiyang.

> 
> --D
> 
>>
>> --
>> Thanks,
>> Ruan Shiyang.
>>
>>>
>>> thanks,
>>> -jane
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
> 
>