From: Stefan Hajnoczi <stefanha@redhat.com>
To: Liu Yuan <namei.unix@gmail.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] 100% CPU when sockfd is half-closed and unexpected behavior for qemu_co_send()
Date: Mon, 14 Jan 2013 11:23:03 +0100 [thread overview]
Message-ID: <20130114102303.GA11988@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <50F3BEE2.5090802@gmail.com>
On Mon, Jan 14, 2013 at 04:16:34PM +0800, Liu Yuan wrote:
> Hi List,
> This problem can be reproduced by:
> 1. start a sheepdog cluster and create a volume 'test'*
> 2. attach 'test' to a bootable image like
> $ qemu -hda image -drive if=virtio,file=sheepdog:test
> 3. pkill sheep # create a half-closed situation
>
> I have straced it that QEMU is busy doing nonsense read/write() after
> select() in os_host_main_loop_wait(). I have no knowledge of
> glib_select_xxx, so someone please help fix it.
You mentioned a nonsense read(). What is the return value?
If you get a read with return value 0, this tells you the socket has
been closed. Can you handle these cases in block/sheepdog.c?
Stefan
next prev parent reply other threads:[~2013-01-14 10:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-14 8:16 [Qemu-devel] 100% CPU when sockfd is half-closed and unexpected behavior for qemu_co_send() Liu Yuan
2013-01-14 9:09 ` Paolo Bonzini
2013-01-14 9:29 ` Liu Yuan
2013-01-14 10:07 ` Paolo Bonzini
2013-01-16 6:39 ` Liu Yuan
2013-01-14 10:23 ` Stefan Hajnoczi [this message]
2013-01-14 10:26 ` Liu Yuan
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