linux-kernel - Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a race

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Message-ID: <CALCETrX=-1hfy_MgZX5HswTOG8WqUHrMCN+c0KHoZYQSHHB_7Q@mail.gmail.com>
Date:	Thu, 17 Dec 2015 13:06:54 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Dominique Martinet <dominique.martinet@....fr>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	V9FS Developers <v9fs-developer@...ts.sourceforge.net>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [V9fs-developer] Hang triggered by udev coldplug, looks like a race

On Tue, Dec 8, 2015 at 10:45 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Wed, Dec 09, 2015 at 07:23:16AM +0100, Dominique Martinet wrote:
>> Andy Lutomirski wrote on Tue, Dec 08, 2015:
>> > Trace attached.  I don't see anything wrong, but I also don't know
>> > what I'm looking for.
>>
>> Actually doesn't look good, not sure if trace could be missing messages
>> but it looks like tags get reused...
>>
>> Quick and dirty parse script (attached output, it doesn't handle TFLUSH
>> but there are none in his message):
>
> There's also not a single RCLUNK in there, which looks like missing packets.
> AFAICS, all (apparent) tag reuses caught by your awk script are of that nature.
> And all RERROR are plain "no such file" in response to TWALK; all those
> TCLUNK in there get no reply whatsoever - neither success nor failure...

This could be QEMU's analysis script screwing up.  Is there a good way
for me to gather more info?

--Andy
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