> Hi all,
> First of all I couldn't reproduce this regression in my sand box. So > the following speculation is only my guess. I suspect that the commit > (ae4647fb) isn't root cause. It just uncover a potential bug that has > been there for a long time. I look at the code, and found two > suspicious stuff in jbd2. The first one is in do_get_write_access(). > In this function we forgot to lock bh state when we check b_jlist == > BJ_Shadow. I generate a patch to fix it, and I really think it is the > root cause. Further, in __journal_remove_journal_head() we check > b_jlist == BJ_None. But, when this function is called, bh state won't > be locked sometimes. So I suspect this is why we hit a BUG in > jbd2_journal_put_journal_head(). But I don't have a good solution to > fix this until now because I don't know whether we need to lock bh state > here, or maybe we should remove this assertation. > > So, generally, Tony, Eunbong, could you please try the following patch? > > Thanks in advance, > - Zheng Hi, I tested your patch. Unfortunately, the same problem was reproduced. Thanks.
