linux-ext4 - Re: kernel panics when hot removing U.2 nvme disk

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Message-ID: <20200924061428.GA27289@infradead.org>
Date:   Thu, 24 Sep 2020 07:14:28 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Meng Wang <meng@...atainc.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Keith Busch <kbusch@...nel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: kernel panics when hot removing U.2 nvme disk

On Thu, Sep 24, 2020 at 05:47:12AM +0000, Meng Wang wrote:
> Thanks for the info. Is it a problem solely for ext4 + nvme combination? If we change file system or use SATA drive, will the problem get workaround?

This will be called for all removals.  I think the root cause probably
is in ext4 where the evict_inode method doesn't properly deal with
non available storage.