[v6,2/2] btrfs: scrub: Fix RAID56 recovery race condition
diff mbox

Message ID 20170414003555.4319-2-quwenruo@cn.fujitsu.com
State New
Headers show

Commit Message

Qu Wenruo April 14, 2017, 12:35 a.m. UTC
When scrubbing a RAID5 which has recoverable data corruption (only one
data stripe is corrupted), sometimes scrub will report more csum errors
than expected. Sometimes even unrecoverable error will be reported.

The problem can be easily reproduced by the following steps:
1) Create a btrfs with RAID5 data profile with 3 devs
2) Mount it with nospace_cache or space_cache=v2
   To avoid extra data space usage.
3) Create a 128K file and sync the fs, unmount it
   Now the 128K file lies at the beginning of the data chunk
4) Locate the physical bytenr of data chunk on dev3
   Dev3 is the 1st data stripe.
5) Corrupt the first 64K of the data chunk stripe on dev3
6) Mount the fs and scrub it

The correct csum error number should be 16(assuming using x86_64).
Larger csum error number can be reported in a 1/3 chance.
And unrecoverable error can also be reported in a 1/10 chance.

The root cause of the problem is RAID5/6 recover code has race
condition, due to the fact that full scrub is initiated per device.

While for other mirror based profiles, each mirror is independent with
each other, so race won't cause any big problem.

For example:
        Corrupted       |       Correct          |      Correct        |
|   Scrub dev3 (D1)     |    Scrub dev2 (D2)     |    Scrub dev1(P)    |
------------------------------------------------------------------------
Read out D1             |Read out D2             |Read full stripe     |
Check csum              |Check csum              |Check parity         |
Csum mismatch           |Csum match, continue    |Parity mismatch      |
handle_errored_block    |                        |handle_errored_block |
 Read out full stripe   |                        | Read out full stripe|
 D1 csum error(err++)   |                        | D1 csum error(err++)|
 Recover D1             |                        | Recover D1          |

So D1's csum error is accounted twice, just because
handle_errored_block() doesn't have enough protect, and race can happen.

On even worse case, for example D1's recovery code is re-writing
D1/D2/P, and P's recovery code is just reading out full stripe, then we
can cause unrecoverable error.

This patch will use previously introduced lock_full_stripe() and
unlock_full_stripe() to protect the whole scrub_handle_errored_block()
function for RAID56 recovery.
So no extra csum error nor unrecoverable error.

Reported-by: Goffredo Baroncelli <kreijack@libero.it>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
 fs/btrfs/scrub.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Comments

David Sterba April 18, 2017, 11:09 a.m. UTC | #1
On Fri, Apr 14, 2017 at 08:35:55AM +0800, Qu Wenruo wrote:
> When scrubbing a RAID5 which has recoverable data corruption (only one
> data stripe is corrupted), sometimes scrub will report more csum errors
> than expected. Sometimes even unrecoverable error will be reported.
> 
> The problem can be easily reproduced by the following steps:
> 1) Create a btrfs with RAID5 data profile with 3 devs
> 2) Mount it with nospace_cache or space_cache=v2
>    To avoid extra data space usage.
> 3) Create a 128K file and sync the fs, unmount it
>    Now the 128K file lies at the beginning of the data chunk
> 4) Locate the physical bytenr of data chunk on dev3
>    Dev3 is the 1st data stripe.
> 5) Corrupt the first 64K of the data chunk stripe on dev3
> 6) Mount the fs and scrub it
> 
> The correct csum error number should be 16(assuming using x86_64).
> Larger csum error number can be reported in a 1/3 chance.
> And unrecoverable error can also be reported in a 1/10 chance.
> 
> The root cause of the problem is RAID5/6 recover code has race
> condition, due to the fact that full scrub is initiated per device.
> 
> While for other mirror based profiles, each mirror is independent with
> each other, so race won't cause any big problem.
> 
> For example:
>         Corrupted       |       Correct          |      Correct        |
> |   Scrub dev3 (D1)     |    Scrub dev2 (D2)     |    Scrub dev1(P)    |
> ------------------------------------------------------------------------
> Read out D1             |Read out D2             |Read full stripe     |
> Check csum              |Check csum              |Check parity         |
> Csum mismatch           |Csum match, continue    |Parity mismatch      |
> handle_errored_block    |                        |handle_errored_block |
>  Read out full stripe   |                        | Read out full stripe|
>  D1 csum error(err++)   |                        | D1 csum error(err++)|
>  Recover D1             |                        | Recover D1          |
> 
> So D1's csum error is accounted twice, just because
> handle_errored_block() doesn't have enough protect, and race can happen.
> 
> On even worse case, for example D1's recovery code is re-writing
> D1/D2/P, and P's recovery code is just reading out full stripe, then we
> can cause unrecoverable error.
> 
> This patch will use previously introduced lock_full_stripe() and
> unlock_full_stripe() to protect the whole scrub_handle_errored_block()
> function for RAID56 recovery.
> So no extra csum error nor unrecoverable error.
> 
> Reported-by: Goffredo Baroncelli <kreijack@libero.it>
> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>

Reviewed-by: David Sterba <dsterba@suse.com>
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Goffredo Baroncelli April 25, 2017, 5:58 p.m. UTC | #2
I Qu,

I tested these two patches on top of 4.10.12; however when I corrupt disk1, It seems that BTRFS is still unable to rebuild parity.

Because in the past the patches set V4 was composed by 5 patches and this one (V5) is composed by only 2 patches, are these 2 sufficient to solve all known bugs of raid56 ? Or I have to cherry pick other two ones ?

BR
G.Baroncelli

On 2017-04-14 02:35, Qu Wenruo wrote:
> When scrubbing a RAID5 which has recoverable data corruption (only one
> data stripe is corrupted), sometimes scrub will report more csum errors
> than expected. Sometimes even unrecoverable error will be reported.
> 
> The problem can be easily reproduced by the following steps:
> 1) Create a btrfs with RAID5 data profile with 3 devs
> 2) Mount it with nospace_cache or space_cache=v2
>    To avoid extra data space usage.
> 3) Create a 128K file and sync the fs, unmount it
>    Now the 128K file lies at the beginning of the data chunk
> 4) Locate the physical bytenr of data chunk on dev3
>    Dev3 is the 1st data stripe.
> 5) Corrupt the first 64K of the data chunk stripe on dev3
> 6) Mount the fs and scrub it
> 
> The correct csum error number should be 16(assuming using x86_64).
> Larger csum error number can be reported in a 1/3 chance.
> And unrecoverable error can also be reported in a 1/10 chance.
> 
> The root cause of the problem is RAID5/6 recover code has race
> condition, due to the fact that full scrub is initiated per device.
> 
> While for other mirror based profiles, each mirror is independent with
> each other, so race won't cause any big problem.
> 
> For example:
>         Corrupted       |       Correct          |      Correct        |
> |   Scrub dev3 (D1)     |    Scrub dev2 (D2)     |    Scrub dev1(P)    |
> ------------------------------------------------------------------------
> Read out D1             |Read out D2             |Read full stripe     |
> Check csum              |Check csum              |Check parity         |
> Csum mismatch           |Csum match, continue    |Parity mismatch      |
> handle_errored_block    |                        |handle_errored_block |
>  Read out full stripe   |                        | Read out full stripe|
>  D1 csum error(err++)   |                        | D1 csum error(err++)|
>  Recover D1             |                        | Recover D1          |
> 
> So D1's csum error is accounted twice, just because
> handle_errored_block() doesn't have enough protect, and race can happen.
> 
> On even worse case, for example D1's recovery code is re-writing
> D1/D2/P, and P's recovery code is just reading out full stripe, then we
> can cause unrecoverable error.
> 
> This patch will use previously introduced lock_full_stripe() and
> unlock_full_stripe() to protect the whole scrub_handle_errored_block()
> function for RAID56 recovery.
> So no extra csum error nor unrecoverable error.
> 
> Reported-by: Goffredo Baroncelli <kreijack@libero.it>
> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
> ---
>  fs/btrfs/scrub.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 980deb8aae47..7d8ce57fd08a 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -1113,6 +1113,7 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>  	int mirror_index;
>  	int page_num;
>  	int success;
> +	bool full_stripe_locked;
>  	static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
>  				      DEFAULT_RATELIMIT_BURST);
>  
> @@ -1138,6 +1139,24 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>  	have_csum = sblock_to_check->pagev[0]->have_csum;
>  	dev = sblock_to_check->pagev[0]->dev;
>  
> +	/*
> +	 * For RAID5/6 race can happen for different dev scrub thread.
> +	 * For data corruption, Parity and Data thread will both try
> +	 * to recovery the data.
> +	 * Race can lead to double added csum error, or even unrecoverable
> +	 * error.
> +	 */
> +	ret = lock_full_stripe(fs_info, logical, &full_stripe_locked);
> +	if (ret < 0) {
> +		spin_lock(&sctx->stat_lock);
> +		if (ret == -ENOMEM)
> +			sctx->stat.malloc_errors++;
> +		sctx->stat.read_errors++;
> +		sctx->stat.uncorrectable_errors++;
> +		spin_unlock(&sctx->stat_lock);
> +		return ret;
> +	}
> +
>  	if (sctx->is_dev_replace && !is_metadata && !have_csum) {
>  		sblocks_for_recheck = NULL;
>  		goto nodatasum_case;
> @@ -1472,6 +1491,9 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>  		kfree(sblocks_for_recheck);
>  	}
>  
> +	ret = unlock_full_stripe(fs_info, logical, full_stripe_locked);
> +	if (ret < 0)
> +		return ret;
>  	return 0;
>  }
>  
>
Qu Wenruo April 26, 2017, 12:13 a.m. UTC | #3
At 04/26/2017 01:58 AM, Goffredo Baroncelli wrote:
> I Qu,
> 
> I tested these two patches on top of 4.10.12; however when I corrupt disk1, It seems that BTRFS is still unable to rebuild parity.
> 
> Because in the past the patches set V4 was composed by 5 patches and this one (V5) is composed by only 2 patches, are these 2 sufficient to solve all known bugs of raid56 ? Or I have to cherry pick other two ones ?
> 
> BR
> G.Baroncelli

These 2 patches are for David to merge.

The rest 3 patches are reviewed by Liu Bo and has nothing to be modified.

To test the full ability to recovery, please try latest mainline master, 
which doesn't only include my RAID56 scrub patches, but also patches 
from Liu Bo to do scrub recovery correctly.

Thanks,
Qu

> 
> On 2017-04-14 02:35, Qu Wenruo wrote:
>> When scrubbing a RAID5 which has recoverable data corruption (only one
>> data stripe is corrupted), sometimes scrub will report more csum errors
>> than expected. Sometimes even unrecoverable error will be reported.
>>
>> The problem can be easily reproduced by the following steps:
>> 1) Create a btrfs with RAID5 data profile with 3 devs
>> 2) Mount it with nospace_cache or space_cache=v2
>>     To avoid extra data space usage.
>> 3) Create a 128K file and sync the fs, unmount it
>>     Now the 128K file lies at the beginning of the data chunk
>> 4) Locate the physical bytenr of data chunk on dev3
>>     Dev3 is the 1st data stripe.
>> 5) Corrupt the first 64K of the data chunk stripe on dev3
>> 6) Mount the fs and scrub it
>>
>> The correct csum error number should be 16(assuming using x86_64).
>> Larger csum error number can be reported in a 1/3 chance.
>> And unrecoverable error can also be reported in a 1/10 chance.
>>
>> The root cause of the problem is RAID5/6 recover code has race
>> condition, due to the fact that full scrub is initiated per device.
>>
>> While for other mirror based profiles, each mirror is independent with
>> each other, so race won't cause any big problem.
>>
>> For example:
>>          Corrupted       |       Correct          |      Correct        |
>> |   Scrub dev3 (D1)     |    Scrub dev2 (D2)     |    Scrub dev1(P)    |
>> ------------------------------------------------------------------------
>> Read out D1             |Read out D2             |Read full stripe     |
>> Check csum              |Check csum              |Check parity         |
>> Csum mismatch           |Csum match, continue    |Parity mismatch      |
>> handle_errored_block    |                        |handle_errored_block |
>>   Read out full stripe   |                        | Read out full stripe|
>>   D1 csum error(err++)   |                        | D1 csum error(err++)|
>>   Recover D1             |                        | Recover D1          |
>>
>> So D1's csum error is accounted twice, just because
>> handle_errored_block() doesn't have enough protect, and race can happen.
>>
>> On even worse case, for example D1's recovery code is re-writing
>> D1/D2/P, and P's recovery code is just reading out full stripe, then we
>> can cause unrecoverable error.
>>
>> This patch will use previously introduced lock_full_stripe() and
>> unlock_full_stripe() to protect the whole scrub_handle_errored_block()
>> function for RAID56 recovery.
>> So no extra csum error nor unrecoverable error.
>>
>> Reported-by: Goffredo Baroncelli <kreijack@libero.it>
>> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
>> ---
>>   fs/btrfs/scrub.c | 22 ++++++++++++++++++++++
>>   1 file changed, 22 insertions(+)
>>
>> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
>> index 980deb8aae47..7d8ce57fd08a 100644
>> --- a/fs/btrfs/scrub.c
>> +++ b/fs/btrfs/scrub.c
>> @@ -1113,6 +1113,7 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>>   	int mirror_index;
>>   	int page_num;
>>   	int success;
>> +	bool full_stripe_locked;
>>   	static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
>>   				      DEFAULT_RATELIMIT_BURST);
>>   
>> @@ -1138,6 +1139,24 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>>   	have_csum = sblock_to_check->pagev[0]->have_csum;
>>   	dev = sblock_to_check->pagev[0]->dev;
>>   
>> +	/*
>> +	 * For RAID5/6 race can happen for different dev scrub thread.
>> +	 * For data corruption, Parity and Data thread will both try
>> +	 * to recovery the data.
>> +	 * Race can lead to double added csum error, or even unrecoverable
>> +	 * error.
>> +	 */
>> +	ret = lock_full_stripe(fs_info, logical, &full_stripe_locked);
>> +	if (ret < 0) {
>> +		spin_lock(&sctx->stat_lock);
>> +		if (ret == -ENOMEM)
>> +			sctx->stat.malloc_errors++;
>> +		sctx->stat.read_errors++;
>> +		sctx->stat.uncorrectable_errors++;
>> +		spin_unlock(&sctx->stat_lock);
>> +		return ret;
>> +	}
>> +
>>   	if (sctx->is_dev_replace && !is_metadata && !have_csum) {
>>   		sblocks_for_recheck = NULL;
>>   		goto nodatasum_case;
>> @@ -1472,6 +1491,9 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
>>   		kfree(sblocks_for_recheck);
>>   	}
>>   
>> +	ret = unlock_full_stripe(fs_info, logical, full_stripe_locked);
>> +	if (ret < 0)
>> +		return ret;
>>   	return 0;
>>   }
>>   
>>
> 
> 


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Goffredo Baroncelli April 27, 2017, 7:26 p.m. UTC | #4
On 2017-04-26 02:13, Qu Wenruo wrote:
> 
> 
> At 04/26/2017 01:58 AM, Goffredo Baroncelli wrote:
>> I Qu,
>> 
>> I tested these two patches on top of 4.10.12; however when I
>> corrupt disk1, It seems that BTRFS is still unable to rebuild
>> parity.
>> 
>> Because in the past the patches set V4 was composed by 5 patches
>> and this one (V5) is composed by only 2 patches, are these 2
>> sufficient to solve all known bugs of raid56 ? Or I have to cherry
>> pick other two ones ?
>> 
>> BR G.Baroncelli
> 
> These 2 patches are for David to merge.
> 
> The rest 3 patches are reviewed by Liu Bo and has nothing to be
> modified.
> 
> To test the full ability to recovery, please try latest mainline
> master, which doesn't only include my RAID56 scrub patches, but also
> patches from Liu Bo to do scrub recovery correctly.

You are right; I tested the 4.11-rc8 and it is able to detect and correct the defects

BR
G.Baroncelli
> 
> Thanks, Qu
> 
>> 
>> On 2017-04-14 02:35, Qu Wenruo wrote:
>>> When scrubbing a RAID5 which has recoverable data corruption
>>> (only one data stripe is corrupted), sometimes scrub will report
>>> more csum errors than expected. Sometimes even unrecoverable
>>> error will be reported.
>>> 
>>> The problem can be easily reproduced by the following steps: 1)
>>> Create a btrfs with RAID5 data profile with 3 devs 2) Mount it
>>> with nospace_cache or space_cache=v2 To avoid extra data space
>>> usage. 3) Create a 128K file and sync the fs, unmount it Now the
>>> 128K file lies at the beginning of the data chunk 4) Locate the
>>> physical bytenr of data chunk on dev3 Dev3 is the 1st data
>>> stripe. 5) Corrupt the first 64K of the data chunk stripe on
>>> dev3 6) Mount the fs and scrub it
>>> 
>>> The correct csum error number should be 16(assuming using
>>> x86_64). Larger csum error number can be reported in a 1/3
>>> chance. And unrecoverable error can also be reported in a 1/10
>>> chance.
>>> 
>>> The root cause of the problem is RAID5/6 recover code has race 
>>> condition, due to the fact that full scrub is initiated per
>>> device.
>>> 
>>> While for other mirror based profiles, each mirror is independent
>>> with each other, so race won't cause any big problem.
>>> 
>>> For example: Corrupted       |       Correct          |
>>> Correct        | |   Scrub dev3 (D1)     |    Scrub dev2 (D2)
>>> |    Scrub dev1(P)    | 
>>> ------------------------------------------------------------------------
>>>
>>> 
Read out D1             |Read out D2             |Read full stripe     |
>>> Check csum              |Check csum              |Check parity
>>> | Csum mismatch           |Csum match, continue    |Parity
>>> mismatch      | handle_errored_block    |
>>> |handle_errored_block | Read out full stripe   |
>>> | Read out full stripe| D1 csum error(err++)   |
>>> | D1 csum error(err++)| Recover D1             |
>>> | Recover D1          |
>>> 
>>> So D1's csum error is accounted twice, just because 
>>> handle_errored_block() doesn't have enough protect, and race can
>>> happen.
>>> 
>>> On even worse case, for example D1's recovery code is re-writing 
>>> D1/D2/P, and P's recovery code is just reading out full stripe,
>>> then we can cause unrecoverable error.
>>> 
>>> This patch will use previously introduced lock_full_stripe() and 
>>> unlock_full_stripe() to protect the whole
>>> scrub_handle_errored_block() function for RAID56 recovery. So no
>>> extra csum error nor unrecoverable error.
>>> 
>>> Reported-by: Goffredo Baroncelli <kreijack@libero.it> 
>>> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> --- 
>>> fs/btrfs/scrub.c | 22 ++++++++++++++++++++++ 1 file changed, 22
>>> insertions(+)
>>> 
>>> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index
>>> 980deb8aae47..7d8ce57fd08a 100644 --- a/fs/btrfs/scrub.c +++
>>> b/fs/btrfs/scrub.c @@ -1113,6 +1113,7 @@ static int
>>> scrub_handle_errored_block(struct scrub_block *sblock_to_check) 
>>> int mirror_index; int page_num; int success; +    bool
>>> full_stripe_locked; static DEFINE_RATELIMIT_STATE(_rs,
>>> DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST); @@ -1138,6
>>> +1139,24 @@ static int scrub_handle_errored_block(struct
>>> scrub_block *sblock_to_check) have_csum =
>>> sblock_to_check->pagev[0]->have_csum; dev =
>>> sblock_to_check->pagev[0]->dev; +    /* +     * For RAID5/6 race
>>> can happen for different dev scrub thread. +     * For data
>>> corruption, Parity and Data thread will both try +     * to
>>> recovery the data. +     * Race can lead to double added csum
>>> error, or even unrecoverable +     * error. +     */ +    ret =
>>> lock_full_stripe(fs_info, logical, &full_stripe_locked); +    if
>>> (ret < 0) { +        spin_lock(&sctx->stat_lock); +        if
>>> (ret == -ENOMEM) +            sctx->stat.malloc_errors++; +
>>> sctx->stat.read_errors++; +
>>> sctx->stat.uncorrectable_errors++; +
>>> spin_unlock(&sctx->stat_lock); +        return ret; +    } + if
>>> (sctx->is_dev_replace && !is_metadata && !have_csum) { 
>>> sblocks_for_recheck = NULL; goto nodatasum_case; @@ -1472,6
>>> +1491,9 @@ static int scrub_handle_errored_block(struct
>>> scrub_block *sblock_to_check) kfree(sblocks_for_recheck); } +
>>> ret = unlock_full_stripe(fs_info, logical, full_stripe_locked); +
>>> if (ret < 0) +        return ret; return 0; }
>>> 
>> 
>> 
> 
> 
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>

Patch
diff mbox

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 980deb8aae47..7d8ce57fd08a 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1113,6 +1113,7 @@  static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
 	int mirror_index;
 	int page_num;
 	int success;
+	bool full_stripe_locked;
 	static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
 				      DEFAULT_RATELIMIT_BURST);
 
@@ -1138,6 +1139,24 @@  static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
 	have_csum = sblock_to_check->pagev[0]->have_csum;
 	dev = sblock_to_check->pagev[0]->dev;
 
+	/*
+	 * For RAID5/6 race can happen for different dev scrub thread.
+	 * For data corruption, Parity and Data thread will both try
+	 * to recovery the data.
+	 * Race can lead to double added csum error, or even unrecoverable
+	 * error.
+	 */
+	ret = lock_full_stripe(fs_info, logical, &full_stripe_locked);
+	if (ret < 0) {
+		spin_lock(&sctx->stat_lock);
+		if (ret == -ENOMEM)
+			sctx->stat.malloc_errors++;
+		sctx->stat.read_errors++;
+		sctx->stat.uncorrectable_errors++;
+		spin_unlock(&sctx->stat_lock);
+		return ret;
+	}
+
 	if (sctx->is_dev_replace && !is_metadata && !have_csum) {
 		sblocks_for_recheck = NULL;
 		goto nodatasum_case;
@@ -1472,6 +1491,9 @@  static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
 		kfree(sblocks_for_recheck);
 	}
 
+	ret = unlock_full_stripe(fs_info, logical, full_stripe_locked);
+	if (ret < 0)
+		return ret;
 	return 0;
 }