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Message-ID: <20190406230352.GG18897@mit.edu> Date: Sat, 6 Apr 2019 19:03:52 -0400 From: "Theodore Ts'o" <tytso@....edu> To: Jiufei Xue <jiufei.xue@...ux.alibaba.com> Cc: linux-ext4@...r.kernel.org, jack@...e.cz, renzhen@...ux.alibaba.com Subject: Re: [PATCH v2] jbd2: check superblock mapped prior to committing On Thu, Mar 28, 2019 at 06:07:50PM +0800, Jiufei Xue wrote: > We hit a BUG at fs/buffer.c:3057 if we detached the nbd device > before unmounting ext4 filesystem. > > The typical chain of events leading to the BUG: > jbd2_write_superblock > submit_bh > submit_bh_wbc > BUG_ON(!buffer_mapped(bh)); > > The block device is removed and all the pages are invalidated. JBD2 > was trying to write journal superblock to the block device which is > no longer present. > > Fix this by checking the journal superblock's buffer head prior to > submitting. Thanks, applied. - Ted
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