linux-ext4 - Re: Panic with ext4,nbd,qemu-img,block

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Message-ID: <20180125092659.wi2bj3gvv6ezmiuj@quack2.suse.cz>
Date:   Thu, 25 Jan 2018 10:26:59 +0100
From:   Jan Kara <jack@...e.cz>
To:     Theodore Ts'o <tytso@....edu>
Cc:     "Hongzhi, Song" <hongzhi.song@...driver.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: Panic with ext4,nbd,qemu-img,block

On Sat 20-01-18 18:40:28, Theodore Ts'o wrote:
> On Sat, Jan 20, 2018 at 04:41:00PM +0800, Hongzhi, Song wrote:
> > 
> > 329.11 EXT4-fs (nbd0): mounted filesystem with ordered data mode. Opts:
> > (null)
> > 329.12 block nbd0: Connection timed out
> > 329.13 block nbd0: shutting down sockets
> 
> That's your problem.  I'm guessing qemu-nbd is dying for some reason,
> which is causing the nbd device to fail (hence the "connection timed
> out").

All those filesystem errors are obviously his problem but:

329.45 ------------[ cut here ]------------
329.46 kernel BUG at /kernel-source//fs/buffer.c:3091!
329.47 invalid opcode: 0000 [#1] PREEMPT SMP
...

is a kernel problem. Hongzhi, can you please track down which line in
submit_bh_wbc() is line 3091 in your sources? I'd be interested in which
assertion actually failed. My best bets would be on
	BUG_ON(!buffer_mapped(bh));
but I'm not sure...

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR