linux-kernel - Re: BUG_ON in virtio-ring.c

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Message-ID: <CAAts5mPGV+u+r5cr4Ry+ePOpJSDY0BKY_T4A+hPaXVTWXL=TDg@mail.gmail.com>
Date:	Tue, 4 Nov 2014 15:44:47 +0100
From:	Alexey Lapitsky <lex.public@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Dave Airlie <airlied@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: BUG_ON in virtio-ring.c

Hi,

Sorry for the long delay. It prints exactly the same:

[    3.792033] virtqueue elements = 128, max_segments = 126 (1 queues)
[    3.802191]  vda: vda1 vda2 < vda5 >

A little bit more about my setup (if it helps):

It's a qemu-system-x86_64 kvm instance with 16 cores and 10G of RAM.
I can reproduce the bug every time with mkfs.btrfs on a 10GB LVM
volume (right after the reboot).

I have almost no knowledge of vring / virtio.
Is it correct that we need just one sg_elem entry in the vq->vring if
vq->indirect flag is set?
That's what I thought when applying the "BUG_ON(total_sg >
vq->vring.num && !vq->indirect)" patch.
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