[erlang-patches] Fix crash in mnesia_controller due to a function_clause exception from is_tab_blocked/1

Henrik Nord <>
Tue Nov 12 10:54:50 CET 2013


On 2013-05-20 15:02, Dan Gudmundsson wrote:
> Hi
>
> I believe the bug is that block_table is called twice, I don't think 
> that should happen.
> It was some time ago I wrote that part, so can you try to investigate 
> why that happens?
>
> I do not want to take this patch as it is, without knowing why it 
> happens, since it may mask
> other more serious faults.
>
> /Dan

Ping!

>
>
> On Thu, May 2, 2013 at 10:23 AM, Ahmed Omar < 
> <mailto:>> wrote:
>
>     Thanks Fredrik for your comments, to avoid confusing commits,
>     Please fetch from
>
>     git fetch git://github.com/spawnthink/otp.git
>     <http://github.com/spawnthink/otp.git>fix_mnesia_block_table_exception
>
>     https://github.com/spawnthink/otp/compare/fix_mnesia_block_table_exception
>     https://github.com/spawnthink/otp/compare/fix_mnesia_block_table_exception.patch
>
>
>     On Thu, May 2, 2013 at 10:05 AM, Ahmed Omar <
>     <mailto:>> wrote:
>
>         Hello Fredrik,
>         Could you please refetch, I removed an extra call to val(Var)
>         https://github.com/spawnthink/otp/compare/fix_mnesia_block_table
>
>
>         On Thu, May 2, 2013 at 9:12 AM, Fredrik <
>         <mailto:>> wrote:
>
>             On 05/01/2013 03:49 PM, Ahmed Omar wrote:
>>             git fetch git://github.com/spawnthink/otp.git
>>             <http://github.com/spawnthink/otp.git>fix_mnesia_block_table
>>
>>             Fix crash in mnesia_controller due to a function_clause
>>             exception from is_tab_blocked/1
>>
>>             If mnesia_controller:block_table/1 is called twice for
>>             same table,
>>             the new stored value of {Tab, where_to_commit} will be
>>             {blocked, {blocked,List}}.
>>             This will result in an exception when calling
>>             is_tab_blocked/1.
>>             mnesia_conttoller:block_table/1 should check if the table
>>             is already blocked.
>>
>>             https://github.com/spawnthink/otp/compare/fix_mnesia_block_table.patch
>>             https://github.com/spawnthink/otp/compare/fix_mnesia_block_table
>>
>>             Best Regards,
>>             Ahmed Omar
>>
>>
>>             _______________________________________________
>>             erlang-patches mailing list
>>               <mailto:>
>>             http://erlang.org/mailman/listinfo/erlang-patches
>             Hello Ahmed,
>             I've fetched your patch and it is currently in the 'pu'
>             branch.
>
>             -- 
>
>             BR Fredrik Gustafsson
>             Erlang OTP Team
>
>
>
>
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-- 
/Henrik Nord Erlang/OTP

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