Re: Re: EXT4 panic at jbd2_journal_put_journal_head() in 3.9+

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> Hi,

> Bitfields are likely to be implemented using read-modify-write semantics.
> Modifications of either b_jlist or b_jmodified must be done under lock
> since they share same uint. I guess this lock is missing somewhere.

Hi, I agree with you.  b_jlist and b_jmodified share the same unit.
I think they are separated. 
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